1 files changed, 2952 insertions, 0 deletions

diff --git a/apps/plugins/pdbox/PDa/src/g_canvas.c b/apps/plugins/pdbox/PDa/src/g_canvas.c
new file mode 100644
index 0000000000..f4ef8b14aa
--- /dev/null
+++ b/apps/plugins/pdbox/PDa/src/g_canvas.c
@@ -0,0 +1,2952 @@
+/* Copyright (c) 1997-2001 Miller Puckette and others.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+/* this file defines the "glist" class, also known as "canvas" (the two used
+to be different but are now unified except for some fossilized names.) */
+
+/* changes by Thomas Musil IEM KUG Graz Austria 2001 */
+
+/* bug-fix: canvas_menuclose(): by Krzysztof Czaja */
+/* bug-fix: table_new(): I reversed the y-bounds  */
+
+/* IOhannes :
+ * changed the canvas_restore, so that it might accept $args as well
+ * (like "pd $0_test")
+ * so you can make multiple & distinguishable templates
+ * 1511:forum::für::umläute:2001
+ * changes marked with    IOhannes
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "m_pd.h"
+#include "m_imp.h"
+#include "s_stuff.h"
+#include "g_canvas.h"
+#include <string.h>
+#include "g_all_guis.h"
+
+struct _canvasenvironment
+{
+    t_symbol *ce_dir;   /* directory patch lives in */
+    int ce_argc;        /* number of "$" arguments */
+    t_atom *ce_argv;    /* array of "$" arguments */
+    int ce_dollarzero;  /* value of "$0" */
+};
+
+#define GLIST_DEFCANVASWIDTH 240
+#define GLIST_DEFCANVASHEIGHT 300
+
+#ifdef MACOSX
+#define GLIST_DEFCANVASYLOC 22
+#else
+#define GLIST_DEFCANVASYLOC 0
+#endif
+
+/* ---------------------- variables --------------------------- */
+
+extern t_pd *newest;
+t_class *canvas_class;
+static int canvas_dspstate;         /* whether DSP is on or off */  
+t_canvas *canvas_editing;           /* last canvas to start text edting */ 
+t_canvas *canvas_whichfind;         /* last canvas we did a find in */ 
+t_canvas *canvas_list;              /* list of all root canvases */
+
+/* ------------------ forward function declarations --------------- */
+static void canvas_start_dsp(void);
+static void canvas_stop_dsp(void);
+static void canvas_drawlines(t_canvas *x);
+static void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2);
+static void canvas_reflecttitle(t_canvas *x);
+static void canvas_addtolist(t_canvas *x);
+static void canvas_takeofflist(t_canvas *x);
+static void canvas_pop(t_canvas *x, t_floatarg fvis);
+void canvas_create_editor(t_glist *x, int createit);
+
+/* --------- functions to handle the canvas environment ----------- */
+
+static t_symbol *canvas_newfilename = &s_;
+static t_symbol *canvas_newdirectory = &s_;
+static int canvas_newargc;
+static t_atom *canvas_newargv;
+
+static void glist_doupdatewindowlist(t_glist *gl, char *sbuf)
+{
+    t_gobj *g;
+    if (!gl->gl_owner)
+    {
+        /* this is a canvas; if we have a window, put on "windows" list */
+        t_canvas *canvas = (t_canvas *)gl;
+        if (canvas->gl_havewindow)
+        {
+            if (strlen(sbuf) + strlen(gl->gl_name->s_name) + 100 <= 1024)
+            {
+                char tbuf[1024];
+                sprintf(tbuf, "{%s .x%x} ", gl->gl_name->s_name, (t_int)canvas);
+                strcat(sbuf, tbuf);
+            }
+        }
+    }
+    for (g = gl->gl_list; g; g = g->g_next)
+    {
+        if (pd_class(&g->g_pd) == canvas_class)
+            glist_doupdatewindowlist((t_glist *)g, sbuf);
+    }
+    return;
+}
+
+    /* maintain the list of visible toplevels for the GUI's "windows" menu */
+void canvas_updatewindowlist( void)
+{
+    t_canvas *x;
+    char sbuf[1024];
+    strcpy(sbuf, "set menu_windowlist {");
+        /* find all root canvases */
+    for (x = canvas_list; x; x = x->gl_next)
+        glist_doupdatewindowlist(x, sbuf);
+    /* next line updates the window menu state before -postcommand tries it */
+    strcat(sbuf, "}\npdtk_fixwindowmenu\n");
+    sys_gui(sbuf);
+}
+
+    /* add a glist the list of "root" canvases (toplevels without parents.) */
+static void canvas_addtolist(t_canvas *x)
+{
+    x->gl_next = canvas_list;
+    canvas_list = x;
+}
+
+static void canvas_takeofflist(t_canvas *x)
+{
+        /* take it off the window list */
+    if (x == canvas_list) canvas_list = x->gl_next;
+    else
+    {
+        t_canvas *z;
+        for (z = canvas_list; z->gl_next != x; z = z->gl_next)
+            ;
+        z->gl_next = x->gl_next;
+    }
+}
+
+
+void canvas_setargs(int argc, t_atom *argv)
+{
+        /* if there's an old one lying around free it here.  This
+        happens if an abstraction is loaded but never gets as far
+        as calling canvas_new(). */
+    if (canvas_newargv)
+        freebytes(canvas_newargv, canvas_newargc * sizeof(t_atom));
+    canvas_newargc = argc;
+    canvas_newargv = copybytes(argv, argc * sizeof(t_atom));
+}
+
+void glob_setfilename(void *dummy, t_symbol *filesym, t_symbol *dirsym)
+{
+    canvas_newfilename = filesym;
+    canvas_newdirectory = dirsym;
+}
+
+t_canvas *canvas_getcurrent(void)
+{
+    return ((t_canvas *)pd_findbyclass(&s__X, canvas_class));
+}
+
+void canvas_setcurrent(t_canvas *x)
+{
+    pd_pushsym(&x->gl_pd);
+}
+
+void canvas_unsetcurrent(t_canvas *x)
+{
+    pd_popsym(&x->gl_pd);
+}
+
+t_canvasenvironment *canvas_getenv(t_canvas *x)
+{
+    if (!x) bug("canvas_getenv");
+    while (!x->gl_env)
+        if (!(x = x->gl_owner))
+            bug("t_canvasenvironment", x);
+    return (x->gl_env);
+}
+
+int canvas_getdollarzero( void)
+{
+    t_canvas *x = canvas_getcurrent();
+    t_canvasenvironment *env = (x ? canvas_getenv(x) : 0);
+    if (env)
+        return (env->ce_dollarzero);
+    else return (0);
+}
+
+void canvas_getargs(int *argcp, t_atom **argvp)
+{
+    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+    *argcp = e->ce_argc;
+    *argvp = e->ce_argv;
+}
+
+t_symbol *canvas_realizedollar(t_canvas *x, t_symbol *s)
+{
+    t_symbol *ret;
+    char *name = s->s_name;
+    if (*name == '$' && name[1] >= '0' && name[1] <= '9')
+    {
+        t_canvasenvironment *env = canvas_getenv(x);
+        canvas_setcurrent(x);
+        ret = binbuf_realizedollsym(gensym(name+1),
+            env->ce_argc, env->ce_argv, 1);
+        canvas_unsetcurrent(x);
+    }
+    else ret = s;
+    return (ret);
+}
+
+t_symbol *canvas_getcurrentdir(void)
+{
+    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+    return (e->ce_dir);
+}
+
+t_symbol *canvas_getdir(t_canvas *x)
+{
+    t_canvasenvironment *e = canvas_getenv(x);
+    return (e->ce_dir);
+}
+
+void canvas_makefilename(t_canvas *x, char *file, char *result, int resultsize)
+{
+    char *dir = canvas_getenv(x)->ce_dir->s_name;
+    if (file[0] == '/' || (file[0] && file[1] == ':') || !*dir)
+    {
+        strncpy(result, file, resultsize);
+        result[resultsize-1] = 0;
+    }
+    else
+    {
+        int nleft;
+        strncpy(result, dir, resultsize);
+        result[resultsize-1] = 0;
+        nleft = resultsize - strlen(result) - 1;
+        if (nleft <= 0) return;
+        strcat(result, "/");
+        strncat(result, file, nleft);
+        result[resultsize-1] = 0;
+    }           
+}
+
+void canvas_rename(t_canvas *x, t_symbol *s, t_symbol *dir)
+{
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_name = s;
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    if (glist_isvisible(x))
+        canvas_reflecttitle(x);
+    if (dir && dir != &s_)
+    {
+        t_canvasenvironment *e = canvas_getenv(x);
+        e->ce_dir = dir;
+    }
+}
+
+/* --------------- traversing the set of lines in a canvas ----------- */
+
+int canvas_getindex(t_canvas *x, t_gobj *y)
+{
+    t_gobj *y2;
+    int indexno;
+    for (indexno = 0, y2 = x->gl_list; y2 && y2 != y; y2 = y2->g_next)
+        indexno++;
+    return (indexno);
+}
+
+void linetraverser_start(t_linetraverser *t, t_canvas *x)
+{
+    t->tr_ob = 0;
+    t->tr_x = x;
+    t->tr_nextoc = 0;
+    t->tr_nextoutno = t->tr_nout = 0;
+}
+
+t_outconnect *linetraverser_next(t_linetraverser *t)
+{
+    t_outconnect *rval = t->tr_nextoc;
+    int outno;
+    while (!rval)
+    {
+        outno = t->tr_nextoutno;
+        while (outno == t->tr_nout)
+        {
+            t_gobj *y;
+            t_object *ob = 0;
+            if (!t->tr_ob) y = t->tr_x->gl_list;
+            else y = t->tr_ob->ob_g.g_next;
+            for (; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd)) break;
+            if (!ob) return (0);
+            t->tr_ob = ob;
+            t->tr_nout = obj_noutlets(ob);
+            outno = 0;
+            if (glist_isvisible(t->tr_x))
+                gobj_getrect(y, t->tr_x,
+                    &t->tr_x11, &t->tr_y11, &t->tr_x12, &t->tr_y12);
+            else t->tr_x11 = t->tr_y11 = t->tr_x12 = t->tr_y12 = 0;
+        }
+        t->tr_nextoutno = outno + 1;
+        rval = obj_starttraverseoutlet(t->tr_ob, &t->tr_outlet, outno);
+        t->tr_outno = outno;
+    }
+    t->tr_nextoc = obj_nexttraverseoutlet(rval, &t->tr_ob2,
+        &t->tr_inlet, &t->tr_inno);
+    t->tr_nin = obj_ninlets(t->tr_ob2);
+    if (!t->tr_nin) bug("drawline");
+    if (glist_isvisible(t->tr_x))
+    {
+        int inplus = (t->tr_nin == 1 ? 1 : t->tr_nin - 1);
+        int outplus = (t->tr_nout == 1 ? 1 : t->tr_nout - 1);
+        gobj_getrect(&t->tr_ob2->ob_g, t->tr_x,
+            &t->tr_x21, &t->tr_y21, &t->tr_x22, &t->tr_y22);
+        t->tr_lx1 = t->tr_x11 +
+            ((t->tr_x12 - t->tr_x11 - IOWIDTH) * t->tr_outno) /
+                outplus + IOMIDDLE;
+        t->tr_ly1 = t->tr_y12;
+        t->tr_lx2 = t->tr_x21 +
+            ((t->tr_x22 - t->tr_x21 - IOWIDTH) * t->tr_inno)/inplus +
+                IOMIDDLE;
+        t->tr_ly2 = t->tr_y21;
+    }
+    else
+    {
+        t->tr_x21 = t->tr_y21 = t->tr_x22 = t->tr_y22 = 0;
+        t->tr_lx1 = t->tr_ly1 = t->tr_lx2 = t->tr_ly2 = 0;
+    }
+    
+    return (rval);
+}
+
+void linetraverser_skipobject(t_linetraverser *t)
+{
+    t->tr_nextoc = 0;
+    t->tr_nextoutno = t->tr_nout;
+}
+
+/* -------------------- the canvas object -------------------------- */
+int glist_valid = 10000;
+
+void glist_init(t_glist *x)
+{
+        /* zero out everyone except "pd" field */
+    memset(((char *)x) + sizeof(x->gl_pd), 0, sizeof(*x) - sizeof(x->gl_pd));
+    x->gl_stub = gstub_new(x, 0);
+    x->gl_valid = ++glist_valid;
+    x->gl_xlabel = (t_symbol **)t_getbytes(0);
+    x->gl_ylabel = (t_symbol **)t_getbytes(0);
+}
+
+    /* make a new glist.  It will either be a "root" canvas or else
+    its parent will be a "text" object in another window... we don't
+    know which yet. */
+t_canvas *canvas_new(void *dummy, t_symbol *sel, int argc, t_atom *argv)
+{
+    t_canvas *x = (t_canvas *)pd_new(canvas_class);
+    t_canvas *owner = canvas_getcurrent();
+    t_symbol *s = &s_;
+    int vis = 0, width = GLIST_DEFCANVASWIDTH, height = GLIST_DEFCANVASHEIGHT;
+    int xloc = 0, yloc = GLIST_DEFCANVASYLOC;
+    int font = (owner ? owner->gl_font : sys_defaultfont);
+    glist_init(x);
+    x->gl_obj.te_type = T_OBJECT;
+    if (!owner)
+        canvas_addtolist(x);
+    /* post("canvas %x, owner %x", x, owner); */
+
+    if (argc == 5)  /* toplevel: x, y, w, h, font */
+    {
+        xloc = atom_getintarg(0, argc, argv);
+        yloc = atom_getintarg(1, argc, argv);
+        width = atom_getintarg(2, argc, argv);
+        height = atom_getintarg(3, argc, argv);
+        font = atom_getintarg(4, argc, argv);
+    }
+    else if (argc == 6)  /* subwindow: x, y, w, h, name, vis */
+    {
+        xloc = atom_getintarg(0, argc, argv);
+        yloc = atom_getintarg(1, argc, argv);
+        width = atom_getintarg(2, argc, argv);
+        height = atom_getintarg(3, argc, argv);
+        s = atom_getsymbolarg(4, argc, argv);
+        vis = atom_getintarg(5, argc, argv);
+    }
+        /* (otherwise assume we're being created from the menu.) */
+
+    if (canvas_newdirectory->s_name[0])
+    {
+        static int dollarzero = 1000;
+        t_canvasenvironment *env = x->gl_env =
+            (t_canvasenvironment *)getbytes(sizeof(*x->gl_env));
+        env->ce_dir = canvas_newdirectory;
+        env->ce_argc = canvas_newargc;
+        env->ce_argv = canvas_newargv;
+        env->ce_dollarzero = dollarzero++;
+        canvas_newdirectory = &s_;
+        canvas_newargc = 0;
+        canvas_newargv = 0;
+    }
+    else x->gl_env = 0;
+
+    if (yloc < GLIST_DEFCANVASYLOC)
+        yloc = GLIST_DEFCANVASYLOC;
+    if (xloc < 0)
+        xloc = 0;
+    x->gl_x1 = 0;
+    x->gl_y1 = 0;
+    x->gl_x2 = 1;
+    x->gl_y2 = 1;
+    canvas_setbounds(x, xloc, yloc, xloc + width, yloc + height);
+    x->gl_owner = owner;
+    x->gl_name = (*s->s_name ? s : 
+        (canvas_newfilename ? canvas_newfilename : gensym("Pd")));
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_loading = 1;
+    x->gl_willvis = vis;
+    x->gl_edit = !strncmp(x->gl_name->s_name, "Untitled", 8);
+    x->gl_font = sys_nearestfontsize(font);
+    pd_pushsym(&x->gl_pd);
+    return(x);
+}
+
+void canvas_setgraph(t_glist *x, int flag);
+
+static void canvas_coords(t_glist *x, t_symbol *s, int argc, t_atom *argv)
+{
+    x->gl_x1 = atom_getfloatarg(0, argc, argv);
+    x->gl_y1 = atom_getfloatarg(1, argc, argv);
+    x->gl_x2 = atom_getfloatarg(2, argc, argv);
+    x->gl_y2 = atom_getfloatarg(3, argc, argv);
+    x->gl_pixwidth = atom_getintarg(4, argc, argv);
+    x->gl_pixheight = atom_getintarg(5, argc, argv);
+    canvas_setgraph(x, atom_getintarg(6, argc, argv));
+}
+
+    /* make a new glist and add it to this glist.  It will appear as
+    a "graph", not a text object.  */
+t_glist *glist_addglist(t_glist *g, t_symbol *sym,
+    float x1, float y1, float x2, float y2,
+    float px1, float py1, float px2, float py2)
+{
+    static int gcount = 0;
+    int zz;
+    int menu = 0;
+    char *str;
+    t_glist *x = (t_glist *)pd_new(canvas_class);
+    glist_init(x);
+    x->gl_obj.te_type = T_OBJECT;
+    if (!*sym->s_name)
+    {
+        char buf[40];
+        sprintf(buf, "graph%d", ++gcount);
+        sym = gensym(buf);
+        menu = 1;
+    }
+    else if (!strncmp((str = sym->s_name), "graph", 5)
+        && (zz = atoi(str + 5)) > gcount)
+            gcount = zz;
+        /* in 0.34 and earlier, the pixel rectangle and the y bounds were
+        reversed; this would behave the same, except that the dialog window
+        would be confusing.  The "correct" way is to have "py1" be the value
+        that is higher on the screen. */
+    if (py2 < py1)
+    {
+        float zz;
+        zz = y2;
+        y2 = y1;
+        y1 = zz;
+        zz = py2;
+        py2 = py1;
+        py1 = zz;
+    }
+    if (x1 == x2 || y1 == y2)
+        x1 = 0, x2 = 100, y1 = 1, y2 = -1;
+    if (px1 >= px2 || py1 >= py2)
+        px1 = 100, py1 = 20, px2 = 100 + GLIST_DEFGRAPHWIDTH,
+            py2 = 20 + GLIST_DEFGRAPHHEIGHT;
+    x->gl_name = sym;
+    x->gl_x1 = x1;
+    x->gl_x2 = x2;
+    x->gl_y1 = y1;
+    x->gl_y2 = y2;
+    x->gl_obj.te_xpix = px1;
+    x->gl_obj.te_ypix = py1;
+    x->gl_pixwidth = px2 - px1;
+    x->gl_pixheight = py2 - py1;
+    x->gl_font =  (canvas_getcurrent() ?
+        canvas_getcurrent()->gl_font : sys_defaultfont);
+    x->gl_screenx1 = x->gl_screeny1 = 0;
+    x->gl_screenx2 = 240;
+    x->gl_screeny2 = 300;
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_owner = g;
+    x->gl_stretch = 1;
+    x->gl_isgraph = 1;
+    x->gl_obj.te_binbuf = binbuf_new();
+    binbuf_addv(x->gl_obj.te_binbuf, "s", gensym("graph"));
+    if (!menu)
+        pd_pushsym(&x->gl_pd);
+    glist_add(g, &x->gl_gobj);
+    if (glist_isvisible(g))
+        canvas_create_editor(x, 1);
+    return (x);
+}
+
+    /* call glist_addglist from a Pd message */
+void glist_glist(t_glist *g, t_symbol *s, int argc, t_atom *argv)
+{
+    t_symbol *sym = atom_getsymbolarg(0, argc, argv);   
+    float x1 = atom_getfloatarg(1, argc, argv);  
+    float y1 = atom_getfloatarg(2, argc, argv);  
+    float x2 = atom_getfloatarg(3, argc, argv);  
+    float y2 = atom_getfloatarg(4, argc, argv);  
+    float px1 = atom_getfloatarg(5, argc, argv);  
+    float py1 = atom_getfloatarg(6, argc, argv);  
+    float px2 = atom_getfloatarg(7, argc, argv);  
+    float py2 = atom_getfloatarg(8, argc, argv);
+    glist_addglist(g, sym, x1, y1, x2, y2, px1, py1, px2, py2);
+}
+
+    /* return true if the glist should appear as a graph on parent;
+    otherwise it appears as a text box. */
+int glist_isgraph(t_glist *x)
+{
+    return (x->gl_isgraph);
+}
+
+    /* This is sent from the GUI to inform a toplevel that its window has been
+    moved or resized. */
+static void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2)
+{
+    int heightwas = y2 - y1;
+    int heightchange = y2 - y1 - (x->gl_screeny2 - x->gl_screeny1);
+    x->gl_screenx1 = x1;
+    x->gl_screeny1 = y1;
+    x->gl_screenx2 = x2;
+    x->gl_screeny2 = y2;
+    /* post("set bounds %d %d %d %d", x1, y1, x2, y2); */
+    if (!glist_isgraph(x) && (x->gl_y2 < x->gl_y1)) 
+    {
+            /* if it's flipped so that y grows upward,
+            fix so that zero is bottom edge and redraw.  This is
+            only appropriate if we're a regular "text" object on the
+            parent. */
+        float diff = x->gl_y1 - x->gl_y2;
+        t_gobj *y;
+        x->gl_y1 = heightwas * diff;
+        x->gl_y2 = x->gl_y1 - diff;
+            /* and move text objects accordingly; they should stick
+            to the bottom, not the top. */
+        for (y = x->gl_list; y; y = y->g_next)
+            if (pd_checkobject(&y->g_pd))
+                gobj_displace(y, x, 0, heightchange);
+        canvas_redraw(x);
+    }
+}
+
+t_symbol *canvas_makebindsym(t_symbol *s)
+{
+    char buf[MAXPDSTRING];
+    strcpy(buf, "pd-");
+    strcat(buf, s->s_name);
+    return (gensym(buf));
+}
+
+void canvas_reflecttitle(t_canvas *x)
+{
+    char namebuf[MAXPDSTRING];
+    t_canvasenvironment *env = canvas_getenv(x);
+    if (env->ce_argc)
+    {
+        int i;
+        strcpy(namebuf, " (");
+        for (i = 0; i < env->ce_argc; i++)
+        {
+            if (strlen(namebuf) > MAXPDSTRING/2 - 5)
+                break;
+            if (i != 0)
+                strcat(namebuf, " ");
+            atom_string(&env->ce_argv[i], namebuf + strlen(namebuf), 
+                MAXPDSTRING/2);
+        }
+        strcat(namebuf, ")");
+    }
+    else namebuf[0] = 0;
+    sys_vgui("wm title .x%x {%s%c%s - %s}\n", 
+        x, x->gl_name->s_name, (x->gl_dirty? '*' : ' '), namebuf,
+            canvas_getdir(x)->s_name);
+}
+
+void canvas_dirty(t_canvas *x, t_int n)
+{
+    t_canvas *x2 = canvas_getrootfor(x);
+    if ((unsigned)n != x2->gl_dirty)
+    {
+        x2->gl_dirty = n;
+        canvas_reflecttitle(x2);
+    }
+}
+
+    /* the window becomes "mapped" (visible and not miniaturized) or
+    "unmapped" (either miniaturized or just plain gone.)  This should be
+    called from the GUI after the fact to "notify" us that we're mapped. */
+void canvas_map(t_canvas *x, t_floatarg f)
+{
+    int flag = (f != 0);
+    t_gobj *y;
+    if (flag)
+    {
+        if (!glist_isvisible(x))
+        {
+            t_selection *sel;
+            if (!x->gl_havewindow)
+            {
+                bug("canvas_map");
+                canvas_vis(x, 1);
+            }
+            for (y = x->gl_list; y; y = y->g_next)
+                gobj_vis(y, x, 1);
+            for (sel = x->gl_editor->e_selection; sel; sel = sel->sel_next)
+                gobj_select(sel->sel_what, x, 1);
+            x->gl_mapped = 1;
+            canvas_drawlines(x);
+                /* simulate a mouse up so u_main will calculate scrollbars...
+                    ugly! */
+            sys_vgui("pdtk_canvas_mouseup .x%x.c 0 0 0\n", x);
+        }
+    }
+    else
+    {
+        if (glist_isvisible(x))
+        {
+                /* just clear out the whole canvas... */
+            sys_vgui(".x%x.c delete all\n", x);
+                /* alternatively, we could have erased them one by one...
+            for (y = x->gl_list; y; y = y->g_next)
+                gobj_vis(y, x, 0);
+                    ... but we should go through and erase the lines as well
+                    if we do it that way. */
+            x->gl_mapped = 0;
+        }
+    }
+}
+
+void canvas_redraw(t_canvas *x)
+{
+    if (glist_isvisible(x))
+    {
+        canvas_map(x, 0);
+        canvas_map(x, 1);
+    }
+}
+
+/* ----  editors -- perhaps this and "vis" should go to g_editor.c ------- */
+
+static t_editor *editor_new(t_glist *owner)
+{
+    char buf[40];
+    t_editor *x = (t_editor *)getbytes(sizeof(*x));
+    x->e_connectbuf = binbuf_new();
+    x->e_deleted = binbuf_new();
+    x->e_glist = owner;
+    sprintf(buf, ".x%x", (t_int)owner);
+    x->e_guiconnect = guiconnect_new(&owner->gl_pd, gensym(buf));
+    return (x);
+}
+
+static void editor_free(t_editor *x, t_glist *y)
+{
+    glist_noselect(y);
+    guiconnect_notarget(x->e_guiconnect, 1000);
+    binbuf_free(x->e_connectbuf);
+    binbuf_free(x->e_deleted);
+    freebytes((void *)x, sizeof(*x));
+}
+
+    /* recursively create or destroy all editors of a glist and its 
+    sub-glists, as long as they aren't toplevels. */
+void canvas_create_editor(t_glist *x, int createit)
+{
+    t_gobj *y;
+    t_object *ob;
+    if (createit)
+    {
+        if (x->gl_editor)
+            bug("canvas_create_editor");
+        else
+        {
+            x->gl_editor = editor_new(x);
+            for (y = x->gl_list; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd))
+                    rtext_new(x, ob);
+        }
+    }
+    else
+    {
+        if (!x->gl_editor)
+            bug("canvas_create_editor");
+        else
+        {
+            for (y = x->gl_list; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd))
+                    rtext_free(glist_findrtext(x, ob));
+            editor_free(x->gl_editor, x);
+            x->gl_editor = 0;
+        }
+    }
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class &&
+            ((t_canvas *)y)->gl_isgraph)
+                canvas_create_editor((t_canvas *)y, createit);
+}
+
+    /* we call this when we want the window to become visible, mapped, and
+    in front of all windows; or with "f" zero, when we want to get rid of
+    the window. */
+void canvas_vis(t_canvas *x, t_floatarg f)
+{
+    char buf[30];
+    int flag = (f != 0);
+    if (flag)
+    {
+            /* test if we're already visible and toplevel */
+        if (glist_isvisible(x) && !x->gl_isgraph)
+        {           /* just put us in front */
+#ifdef MSW
+            canvas_vis(x, 0);
+            canvas_vis(x, 1);
+#else
+            sys_vgui("raise .x%x\n", x);
+            sys_vgui("focus .x%x.c\n", x);
+            sys_vgui("wm deiconify .x%x\n", x);  
+#endif
+        }
+        else
+        {
+            canvas_create_editor(x, 1);
+            sys_vgui("pdtk_canvas_new .x%x %d %d +%d+%d %d\n", x,
+                (int)(x->gl_screenx2 - x->gl_screenx1),
+                (int)(x->gl_screeny2 - x->gl_screeny1),
+                (int)(x->gl_screenx1), (int)(x->gl_screeny1),
+                x->gl_edit);
+            canvas_reflecttitle(x);
+            x->gl_havewindow = 1;
+            canvas_updatewindowlist();
+        }
+    }
+    else    /* make invisible */
+    {
+        int i;
+        t_canvas *x2;
+        if (!x->gl_havewindow)
+        {
+                /* bug workaround -- a graph in a visible patch gets "invised"
+                when the patch is closed, and must lose the editor here.  It's
+                probably not the natural place to do this.  Other cases like
+                subpatches fall here too but don'd need the editor freed, so
+                we check if it exists. */
+            if (x->gl_editor)
+                canvas_create_editor(x, 0);
+            return;
+        }
+        glist_noselect(x);
+        if (glist_isvisible(x))
+            canvas_map(x, 0);
+        canvas_create_editor(x, 0);
+        sys_vgui("destroy .x%x\n", x);
+        for (i = 1, x2 = x; x2; x2 = x2->gl_next, i++)
+            ;
+        sys_vgui(".mbar.find delete %d\n", i);
+            /* if we're a graph on our parent, and if the parent exists
+               and is visible, show ourselves on parent. */
+        if (glist_isgraph(x) && x->gl_owner)
+        {
+            t_glist *gl2 = x->gl_owner;
+            canvas_create_editor(x, 1);
+            if (glist_isvisible(gl2))
+                gobj_vis(&x->gl_gobj, gl2, 0);
+            x->gl_havewindow = 0;
+            if (glist_isvisible(gl2))
+                gobj_vis(&x->gl_gobj, gl2, 1);
+        }
+        else x->gl_havewindow = 0;
+        canvas_updatewindowlist();
+    }
+}
+
+    /* we call this on a non-toplevel glist to "open" it into its
+    own window. */
+void glist_menu_open(t_glist *x)
+{
+    if (glist_isvisible(x) && !glist_istoplevel(x))
+    {
+        t_glist *gl2 = x->gl_owner;
+        if (!gl2) 
+            bug("canvas_vis");  /* shouldn't happen but don't get too upset. */
+        else
+        {
+                /* erase ourself in parent window */
+            gobj_vis(&x->gl_gobj, gl2, 0);
+                    /* get rid of our editor (and subeditors) */
+            canvas_create_editor(x, 0);
+            x->gl_havewindow = 1;
+                    /* redraw ourself in parent window (blanked out this time) */
+            gobj_vis(&x->gl_gobj, gl2, 1);
+        }
+    }
+    canvas_vis(x, 1);
+}
+
+int glist_isvisible(t_glist *x)
+{
+    return ((!x->gl_loading) && glist_getcanvas(x)->gl_mapped);
+}
+
+int glist_istoplevel(t_glist *x)
+{
+        /* we consider a graph "toplevel" if it has its own window
+        or if it appears as a box in its parent window so that we
+        don't draw the actual contents there. */
+    return (x->gl_havewindow || !x->gl_isgraph);
+}
+
+int glist_getfont(t_glist *x)
+{
+    return (glist_getcanvas(x)->gl_font);
+}
+
+void canvas_free(t_canvas *x)
+{
+    t_gobj *y;
+    int dspstate = canvas_suspend_dsp();
+    canvas_noundo(x);
+    if (canvas_editing == x)
+        canvas_editing = 0;
+    if (canvas_whichfind == x)
+        canvas_whichfind = 0;
+    glist_noselect(x);
+    while (y = x->gl_list)
+        glist_delete(x, y);
+    canvas_vis(x, 0);
+
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    if (x->gl_env)
+    {
+        freebytes(x->gl_env->ce_argv, x->gl_env->ce_argc * sizeof(t_atom));
+        freebytes(x->gl_env, sizeof(*x->gl_env));
+    }
+    canvas_resume_dsp(dspstate);
+    glist_cleanup(x);
+    gfxstub_deleteforkey(x);        /* probably unnecessary */
+    if (!x->gl_owner)
+        canvas_takeofflist(x);
+}
+
+/* ----------------- lines ---------- */
+
+static void canvas_drawlines(t_canvas *x)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    {
+        linetraverser_start(&t, x);
+        while (oc = linetraverser_next(&t))
+            sys_vgui(".x%x.c create line %d %d %d %d -width %d -tags l%x\n",
+                    glist_getcanvas(x),
+                        t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2, 
+                            (outlet_getsymbol(t.tr_outlet) == &s_signal ? 2:1),
+                                oc);
+    }
+}
+
+void canvas_fixlinesfor(t_canvas *x, t_text *text)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if (t.tr_ob == text || t.tr_ob2 == text)
+        {
+            sys_vgui(".x%x.c coords l%x %d %d %d %d\n",
+                glist_getcanvas(x), oc,
+                    t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2);
+        }
+    }
+}
+
+    /* kill all lines for the object */
+void canvas_deletelinesfor(t_canvas *x, t_text *text)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if (t.tr_ob == text || t.tr_ob2 == text)
+        {
+            if (x->gl_editor)
+            {
+                sys_vgui(".x%x.c delete l%x\n",
+                    glist_getcanvas(x), oc);
+            }
+            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+        }
+    }
+}
+
+    /* kill all lines for one inlet or outlet */
+void canvas_deletelinesforio(t_canvas *x, t_text *text,
+    t_inlet *inp, t_outlet *outp)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if ((t.tr_ob == text && t.tr_outlet == outp) ||
+            (t.tr_ob2 == text && t.tr_inlet == inp))
+        {
+            if (x->gl_editor)
+            {
+                sys_vgui(".x%x.c delete l%x\n",
+                    glist_getcanvas(x), oc);
+            }
+            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+        }
+    }
+}
+
+static void canvas_pop(t_canvas *x, t_floatarg fvis)
+{
+    if (fvis != 0)
+        canvas_vis(x, 1);
+    pd_popsym(&x->gl_pd);
+    canvas_resortinlets(x);
+    canvas_resortoutlets(x);
+    x->gl_loading = 0;
+}
+
+void canvas_objfor(t_glist *gl, t_text *x, int argc, t_atom *argv);
+
+
+void canvas_restore(t_canvas *x, t_symbol *s, int argc, t_atom *argv)
+{ /* IOhannes */
+    t_pd *z;
+        /* this should be unnecessary, but sometimes the canvas's name gets
+        out of sync with the owning box's argument; this fixes that */
+    if (argc > 3)
+    {
+        t_atom *ap=argv+3;
+        if (ap->a_type == A_SYMBOL)
+        {
+            char *buf=ap->a_w.w_symbol->s_name, *bufp;
+            if (*buf == '$' && buf[1] >= '0' && buf[1] <= '9')
+            {
+                for (bufp = buf+2; *bufp; bufp++)
+                    if (*bufp < '0' || *bufp > '9')
+                {
+                    SETDOLLSYM(ap, gensym(buf+1));
+                    goto didit;
+                }
+                SETDOLLAR(ap, atoi(buf+1));
+            didit: ;
+            }
+        }
+
+        if (ap->a_type == A_DOLLSYM)
+        {
+            t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+            canvas_rename(x, binbuf_realizedollsym(ap->a_w.w_symbol,
+                e->ce_argc, e->ce_argv, 1), 0); 
+        }
+        else if (ap->a_type == A_SYMBOL)
+          canvas_rename(x, argv[3].a_w.w_symbol, 0);
+    }
+    canvas_pop(x, x->gl_willvis);
+
+    if (!(z = gensym("#X")->s_thing)) error("canvas_restore: out of context");
+    else if (*z != canvas_class) error("canvas_restore: wasn't a canvas");
+    else
+    {
+        t_canvas *x2 = (t_canvas *)z;
+        x->gl_owner = x2;
+        canvas_objfor(x2, &x->gl_obj, argc, argv);
+    }
+}
+
+static void canvas_loadbangabstractions(t_canvas *x)
+{
+    t_gobj *y;
+    t_symbol *s = gensym("loadbang");
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class)
+    {
+        if (canvas_isabstraction((t_canvas *)y))
+            canvas_loadbang((t_canvas *)y);
+        else
+            canvas_loadbangabstractions((t_canvas *)y);
+    }
+}
+
+void canvas_loadbangsubpatches(t_canvas *x)
+{
+    t_gobj *y;
+    t_symbol *s = gensym("loadbang");
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class)
+    {
+        if (!canvas_isabstraction((t_canvas *)y))
+            canvas_loadbangsubpatches((t_canvas *)y);
+    }
+    for (y = x->gl_list; y; y = y->g_next)
+        if ((pd_class(&y->g_pd) != canvas_class) &&
+            zgetfn(&y->g_pd, s))
+                pd_vmess(&y->g_pd, s, "");
+}
+
+void canvas_loadbang(t_canvas *x)
+{
+    t_gobj *y;
+    canvas_loadbangabstractions(x);
+    canvas_loadbangsubpatches(x);
+}
+
+    /* When you ask a canvas its size the result is 2 pixels more than what
+    you gave it to open it; perhaps there's a 1-pixel border all around it
+    or something.  Anyway, we just add the 2 pixels back here; seems we
+    have to do this for linux but not MSW; not sure about MacOS. */
+
+#ifdef MSW
+#define HORIZBORDER 0
+#define VERTBORDER 0
+#else
+#define HORIZBORDER 2
+#define VERTBORDER 2
+#endif
+
+static void canvas_relocate(t_canvas *x, t_symbol *canvasgeom,
+    t_symbol *topgeom)
+{
+    int cxpix, cypix, cw, ch, txpix, typix, tw, th;
+    if (sscanf(canvasgeom->s_name, "%dx%d+%d+%d", &cw, &ch, &cxpix, &cypix)
+        < 4 ||
+        sscanf(topgeom->s_name, "%dx%d+%d+%d", &tw, &th, &txpix, &typix) < 4)
+        bug("canvas_relocate");
+            /* for some reason this is initially called with cw=ch=1 so
+            we just suppress that here. */
+    if (cw > 5 && ch > 5)
+        canvas_setbounds(x, txpix, typix,
+            txpix + cw - HORIZBORDER, typix + ch - VERTBORDER);
+}
+
+void canvas_popabstraction(t_canvas *x)
+{
+    newest = &x->gl_pd;
+    pd_popsym(&x->gl_pd);
+    x->gl_loading = 0;
+    canvas_resortinlets(x);
+    canvas_resortoutlets(x);
+}
+
+void canvas_logerror(t_object *y)
+{
+#ifdef LATER
+    canvas_vis(x, 1);
+    if (!glist_isselected(x, &y->ob_g))
+        glist_select(x, &y->ob_g);
+#endif
+}
+
+/* -------------------------- subcanvases ---------------------- */
+
+static void *subcanvas_new(t_symbol *s)
+{
+    t_atom a[6];
+    t_canvas *x, *z = canvas_getcurrent();
+    if (!*s->s_name) s = gensym("/SUBPATCH/");
+    SETFLOAT(a, 0);
+    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
+    SETFLOAT(a+2, GLIST_DEFCANVASWIDTH);
+    SETFLOAT(a+3, GLIST_DEFCANVASHEIGHT);
+    SETSYMBOL(a+4, s);
+    SETFLOAT(a+5, 1);
+    x = canvas_new(0, 0, 6, a);
+    x->gl_owner = z;
+    canvas_pop(x, 1);
+    return (x);
+}
+
+static void canvas_click(t_canvas *x,
+    t_floatarg xpos, t_floatarg ypos,
+        t_floatarg shift, t_floatarg ctrl, t_floatarg alt)
+{
+    canvas_vis(x, 1);
+}
+
+
+    /* find out from subcanvas contents how much to fatten the box */
+void canvas_fattensub(t_canvas *x,
+    int *xp1, int *yp1, int *xp2, int *yp2)
+{
+    t_gobj *y;
+    *xp2 += 50;     /* fake for now */
+    *yp2 += 50;
+}
+
+static void canvas_rename_method(t_canvas *x, t_symbol *s, int ac, t_atom *av)
+{
+    if (ac && av->a_type == A_SYMBOL)
+        canvas_rename(x, av->a_w.w_symbol, 0);
+    else canvas_rename(x, gensym("Pd"), 0);
+}
+
+/* ------------------ table ---------------------------*/
+
+static int tabcount = 0;
+
+static void *table_new(t_symbol *s, t_floatarg f)
+{
+    t_atom a[9];
+    t_glist *gl;
+    t_canvas *x, *z = canvas_getcurrent();
+    if (s == &s_)
+    {
+         char  tabname[255];
+         t_symbol *t = gensym("table"); 
+         sprintf(tabname, "%s%d", t->s_name, tabcount++);
+         s = gensym(tabname); 
+    }
+    if (f <= 1)
+        f = 100;
+    SETFLOAT(a, 0);
+    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
+    SETFLOAT(a+2, 600);
+    SETFLOAT(a+3, 400);
+    SETSYMBOL(a+4, s);
+    SETFLOAT(a+5, 0);
+    x = canvas_new(0, 0, 6, a);
+
+    x->gl_owner = z;
+
+        /* create a graph for the table */
+    gl = glist_addglist((t_glist*)x, &s_, 0, -1, (f > 1 ? f-1 : 1), 1,
+        50, 350, 550, 50);
+
+    graph_array(gl, s, &s_float, f, 0);
+
+    canvas_pop(x, 0); 
+
+    return (x);
+}
+
+    /* return true if the "canvas" object is an abstraction (so we don't
+    save its contents, fogr example.)  */
+int canvas_isabstraction(t_canvas *x)
+{
+    return (x->gl_env != 0);
+}
+
+    /* return true if the "canvas" object is a "table". */
+int canvas_istable(t_canvas *x)
+{
+    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
+    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
+    int istable = (argc && argv[0].a_type == A_SYMBOL &&
+        argv[0].a_w.w_symbol == gensym("table"));
+    return (istable);
+}
+
+    /* return true if the "canvas" object should be treated as a text
+    object.  This is true for abstractions but also for "table"s... */
+int canvas_showtext(t_canvas *x)
+{
+    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
+    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
+    int isarray = (argc && argv[0].a_type == A_SYMBOL &&
+        argv[0].a_w.w_symbol == gensym("graph"));
+    return (!isarray);
+}
+
+static void canvas_dodsp(t_canvas *x, int toplevel, t_signal **sp);
+static void canvas_dsp(t_canvas *x, t_signal **sp)
+{
+    canvas_dodsp(x, 0, sp);
+}
+
+    /* get the document containing this canvas */
+t_canvas *canvas_getrootfor(t_canvas *x)
+{
+    if ((!x->gl_owner) || canvas_isabstraction(x))
+        return (x);
+    else return (canvas_getrootfor(x->gl_owner));
+}
+
+/* ------------------------- DSP chain handling ------------------------- */
+
+EXTERN_STRUCT _dspcontext;
+#define t_dspcontext struct _dspcontext
+
+void ugen_start(void);
+void ugen_stop(void);
+
+t_dspcontext *ugen_start_graph(int toplevel, t_signal **sp,
+    int ninlets, int noutlets);
+void ugen_add(t_dspcontext *dc, t_object *x);
+void ugen_connect(t_dspcontext *dc, t_object *x1, int outno,
+    t_object *x2, int inno);
+void ugen_done_graph(t_dspcontext *dc);
+
+    /* schedule one canvas for DSP.  This is called below for all "root"
+    canvases, but is also called from the "dsp" method for sub-
+    canvases, which are treated almost like any other tilde object.  */
+
+static void canvas_dodsp(t_canvas *x, int toplevel, t_signal **sp)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    t_gobj *y;
+    t_object *ob;
+    t_symbol *dspsym = gensym("dsp");
+    t_dspcontext *dc;    
+
+        /* create a new "DSP graph" object to use in sorting this canvas.
+        If we aren't toplevel, there are already other dspcontexts around. */
+
+    dc = ugen_start_graph(toplevel, sp,
+        obj_nsiginlets(&x->gl_obj),
+        obj_nsigoutlets(&x->gl_obj));
+
+        /* find all the "dsp" boxes and add them to the graph */
+    
+    for (y = x->gl_list; y; y = y->g_next)
+        if ((ob = pd_checkobject(&y->g_pd)) && zgetfn(&y->g_pd, dspsym))
+            ugen_add(dc, ob);
+
+        /* ... and all dsp interconnections */
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+        if (obj_issignaloutlet(t.tr_ob, t.tr_outno))
+            ugen_connect(dc, t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+
+        /* finally, sort them and add them to the DSP chain */
+    ugen_done_graph(dc);
+}
+
+    /* this routine starts DSP for all root canvases. */
+static void canvas_start_dsp(void)
+{
+    t_canvas *x;
+    if (canvas_dspstate) ugen_stop();
+    else sys_gui("pdtk_pd_dsp ON\n");
+    ugen_start();
+    
+    for (x = canvas_list; x; x = x->gl_next)
+        canvas_dodsp(x, 1, 0);
+    
+    canvas_dspstate = 1;
+}
+
+static void canvas_stop_dsp(void)
+{
+    if (canvas_dspstate)
+    {
+        ugen_stop();
+        sys_gui("pdtk_pd_dsp OFF\n");
+        canvas_dspstate = 0;
+    }
+}
+
+    /* DSP can be suspended before, and resumed after, operations which
+    might affect the DSP chain.  For example, we suspend before loading and
+    resume afterward, so that DSP doesn't get resorted for every DSP object
+    int the patch. */
+
+int canvas_suspend_dsp(void)
+{
+    int rval = canvas_dspstate;
+    if (rval) canvas_stop_dsp();
+    return (rval);
+}
+
+void canvas_resume_dsp(int oldstate)
+{
+    if (oldstate) canvas_start_dsp();
+}
+
+    /* this is equivalent to suspending and resuming in one step. */
+void canvas_update_dsp(void)
+{
+    if (canvas_dspstate) canvas_start_dsp();
+}
+
+void glob_dsp(void *dummy, t_symbol *s, int argc, t_atom *argv)
+{
+    int newstate;
+    if (argc)
+    {
+        newstate = atom_getintarg(0, argc, argv);
+        if (newstate && !canvas_dspstate)
+        {
+            sys_set_audio_state(1);
+            canvas_start_dsp();
+        }
+        else if (!newstate && canvas_dspstate)
+        {
+            canvas_stop_dsp();
+            sys_set_audio_state(0);
+        }
+    }
+    else post("dsp state %d", canvas_dspstate);
+}
+
+    /* LATER replace this with a queueing scheme */
+void glist_redrawitem(t_glist *owner, t_gobj *gobj)
+{
+    if (glist_isvisible(owner))
+    {
+        gobj_vis(gobj, owner, 0);
+        gobj_vis(gobj, owner, 1);
+    }
+}
+
+    /* redraw all "scalars" (do this if a drawing command is changed.) 
+    LATER we'll use the "template" information to select which ones we
+    redraw.  */
+static void glist_redrawall(t_glist *gl)
+{
+    t_gobj *g;
+    int vis = glist_isvisible(gl);
+    for (g = gl->gl_list; g; g = g->g_next)
+    {
+        t_class *cl;
+        if (vis && g->g_pd == scalar_class)
+            glist_redrawitem(gl, g);
+        else if (g->g_pd == canvas_class)
+            glist_redrawall((t_glist *)g);
+    }
+}
+
+    /* public interface for above */
+void canvas_redrawallfortemplate(t_canvas *templatecanvas)
+{
+    t_canvas *x;
+        /* find all root canvases */
+    for (x = canvas_list; x; x = x->gl_next)
+        glist_redrawall(x);
+}
+
+/* ------------------------------- setup routine ------------------------ */
+
+    /* why are some of these "glist" and others "canvas"? */
+extern void glist_text(t_glist *x, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_obj(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_bng(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_toggle(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vslider(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_hslider(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+    /* old version... */
+extern void canvas_hdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_hdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+    /* new version: */
+extern void canvas_hradio(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vradio(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vumeter(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_mycnv(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_numbox(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_msg(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_floatatom(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_symbolatom(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void glist_scalar(t_glist *canvas, t_symbol *s, int argc, t_atom *argv);
+
+void g_graph_setup(void);
+void g_editor_setup(void);
+void g_readwrite_setup(void);
+extern void graph_properties(t_gobj *z, t_glist *owner);
+
+void g_canvas_setup(void)
+{
+        /* we prevent the user from typing "canvas" in an object box
+        by sending 0 for a creator function. */
+    canvas_class = class_new(gensym("canvas"), 0,
+        (t_method)canvas_free, sizeof(t_canvas), CLASS_NOINLET, 0);
+            /* here is the real creator function, invoked in patch files
+            by sending the "canvas" message to #N, which is bound
+            to pd_camvasmaker. */
+    class_addmethod(pd_canvasmaker, (t_method)canvas_new, gensym("canvas"),
+        A_GIMME, 0);
+    class_addmethod(canvas_class, (t_method)canvas_restore,
+        gensym("restore"), A_GIMME, 0);
+    class_addmethod(canvas_class, (t_method)canvas_coords,
+        gensym("coords"), A_GIMME, 0);
+
+/* -------------------------- objects ----------------------------- */
+    class_addmethod(canvas_class, (t_method)canvas_obj,
+        gensym("obj"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_msg,
+        gensym("msg"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_floatatom,
+        gensym("floatatom"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_symbolatom,
+        gensym("symbolatom"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_text,
+        gensym("text"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_glist, gensym("graph"),
+        A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_scalar,
+        gensym("scalar"), A_GIMME, A_NULL);
+
+    /* -------------- Thomas Musil's GUI objects ------------ */
+    class_addmethod(canvas_class, (t_method)canvas_bng, gensym("bng"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_toggle, gensym("toggle"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vslider, gensym("vslider"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hslider, gensym("hslider"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hdial, gensym("hdial"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vdial, gensym("vdial"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hradio, gensym("hradio"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vradio, gensym("vradio"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vumeter, gensym("vumeter"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_mycnv, gensym("mycnv"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_numbox, gensym("numbox"),
+                    A_GIMME, A_NULL);
+
+/* ------------------------ gui stuff --------------------------- */
+    class_addmethod(canvas_class, (t_method)canvas_pop, gensym("pop"),
+        A_DEFFLOAT, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_loadbang,
+        gensym("loadbang"), A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_relocate,
+        gensym("relocate"), A_SYMBOL, A_SYMBOL, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vis,
+        gensym("vis"), A_FLOAT, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_menu_open,
+        gensym("menu-open"), A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_map,
+        gensym("map"), A_FLOAT, A_NULL);
+    class_setpropertiesfn(canvas_class, graph_properties);
+
+/* ---------------------- list handling ------------------------ */
+    class_addmethod(canvas_class, (t_method)glist_clear, gensym("clear"),
+        A_NULL);
+
+/* ----- subcanvases, which you get by typing "pd" in a box ---- */
+    class_addcreator((t_newmethod)subcanvas_new, gensym("pd"), A_DEFSYMBOL, 0);
+    class_addcreator((t_newmethod)subcanvas_new, gensym("page"),  A_DEFSYMBOL, 0);
+
+    class_addmethod(canvas_class, (t_method)canvas_click,
+        gensym("click"), A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, 0);
+    class_addmethod(canvas_class, (t_method)canvas_dsp, gensym("dsp"), 0);
+    class_addmethod(canvas_class, (t_method)canvas_rename_method,
+        gensym("rename"), A_GIMME, 0);
+
+/*---------------------------- tables -- GG ------------------- */
+
+    class_addcreator((t_newmethod)table_new, gensym("table"),
+        A_DEFSYM, A_DEFFLOAT, 0);
+
+/* -------------- setups from other files for canvas_class ---------------- */
+    g_graph_setup();
+    g_editor_setup();
+    g_readwrite_setup();
+}
+/* Copyright (c) 1997-2001 Miller Puckette and others.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+/* this file defines the "glist" class, also known as "canvas" (the two used
+to be different but are now unified except for some fossilized names.) */
+
+/* changes by Thomas Musil IEM KUG Graz Austria 2001 */
+
+/* bug-fix: canvas_menuclose(): by Krzysztof Czaja */
+/* bug-fix: table_new(): I reversed the y-bounds  */
+
+/* IOhannes :
+ * changed the canvas_restore, so that it might accept $args as well
+ * (like "pd $0_test")
+ * so you can make multiple & distinguishable templates
+ * 1511:forum::für::umläute:2001
+ * changes marked with    IOhannes
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "m_pd.h"
+#include "m_imp.h"
+#include "s_stuff.h"
+#include "g_canvas.h"
+#include <string.h>
+#include "g_all_guis.h"
+
+struct _canvasenvironment
+{
+    t_symbol *ce_dir;   /* directory patch lives in */
+    int ce_argc;        /* number of "$" arguments */
+    t_atom *ce_argv;    /* array of "$" arguments */
+    int ce_dollarzero;  /* value of "$0" */
+};
+
+#define GLIST_DEFCANVASWIDTH 240
+#define GLIST_DEFCANVASHEIGHT 300
+
+#ifdef MACOSX
+#define GLIST_DEFCANVASYLOC 22
+#else
+#define GLIST_DEFCANVASYLOC 0
+#endif
+
+/* ---------------------- variables --------------------------- */
+
+extern t_pd *newest;
+t_class *canvas_class;
+static int canvas_dspstate;         /* whether DSP is on or off */  
+t_canvas *canvas_editing;           /* last canvas to start text edting */ 
+t_canvas *canvas_whichfind;         /* last canvas we did a find in */ 
+t_canvas *canvas_list;              /* list of all root canvases */
+
+/* ------------------ forward function declarations --------------- */
+static void canvas_start_dsp(void);
+static void canvas_stop_dsp(void);
+static void canvas_drawlines(t_canvas *x);
+static void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2);
+static void canvas_reflecttitle(t_canvas *x);
+static void canvas_addtolist(t_canvas *x);
+static void canvas_takeofflist(t_canvas *x);
+static void canvas_pop(t_canvas *x, t_floatarg fvis);
+void canvas_create_editor(t_glist *x, int createit);
+
+/* --------- functions to handle the canvas environment ----------- */
+
+static t_symbol *canvas_newfilename = &s_;
+static t_symbol *canvas_newdirectory = &s_;
+static int canvas_newargc;
+static t_atom *canvas_newargv;
+
+static void glist_doupdatewindowlist(t_glist *gl, char *sbuf)
+{
+    t_gobj *g;
+    if (!gl->gl_owner)
+    {
+        /* this is a canvas; if we have a window, put on "windows" list */
+        t_canvas *canvas = (t_canvas *)gl;
+        if (canvas->gl_havewindow)
+        {
+            if (strlen(sbuf) + strlen(gl->gl_name->s_name) + 100 <= 1024)
+            {
+                char tbuf[1024];
+                sprintf(tbuf, "{%s .x%x} ", gl->gl_name->s_name, (t_int)canvas);
+                strcat(sbuf, tbuf);
+            }
+        }
+    }
+    for (g = gl->gl_list; g; g = g->g_next)
+    {
+        if (pd_class(&g->g_pd) == canvas_class)
+            glist_doupdatewindowlist((t_glist *)g, sbuf);
+    }
+    return;
+}
+
+    /* maintain the list of visible toplevels for the GUI's "windows" menu */
+void canvas_updatewindowlist( void)
+{
+    t_canvas *x;
+    char sbuf[1024];
+    strcpy(sbuf, "set menu_windowlist {");
+        /* find all root canvases */
+    for (x = canvas_list; x; x = x->gl_next)
+        glist_doupdatewindowlist(x, sbuf);
+    /* next line updates the window menu state before -postcommand tries it */
+    strcat(sbuf, "}\npdtk_fixwindowmenu\n");
+    sys_gui(sbuf);
+}
+
+    /* add a glist the list of "root" canvases (toplevels without parents.) */
+static void canvas_addtolist(t_canvas *x)
+{
+    x->gl_next = canvas_list;
+    canvas_list = x;
+}
+
+static void canvas_takeofflist(t_canvas *x)
+{
+        /* take it off the window list */
+    if (x == canvas_list) canvas_list = x->gl_next;
+    else
+    {
+        t_canvas *z;
+        for (z = canvas_list; z->gl_next != x; z = z->gl_next)
+            ;
+        z->gl_next = x->gl_next;
+    }
+}
+
+
+void canvas_setargs(int argc, t_atom *argv)
+{
+        /* if there's an old one lying around free it here.  This
+        happens if an abstraction is loaded but never gets as far
+        as calling canvas_new(). */
+    if (canvas_newargv)
+        freebytes(canvas_newargv, canvas_newargc * sizeof(t_atom));
+    canvas_newargc = argc;
+    canvas_newargv = copybytes(argv, argc * sizeof(t_atom));
+}
+
+void glob_setfilename(void *dummy, t_symbol *filesym, t_symbol *dirsym)
+{
+    canvas_newfilename = filesym;
+    canvas_newdirectory = dirsym;
+}
+
+t_canvas *canvas_getcurrent(void)
+{
+    return ((t_canvas *)pd_findbyclass(&s__X, canvas_class));
+}
+
+void canvas_setcurrent(t_canvas *x)
+{
+    pd_pushsym(&x->gl_pd);
+}
+
+void canvas_unsetcurrent(t_canvas *x)
+{
+    pd_popsym(&x->gl_pd);
+}
+
+t_canvasenvironment *canvas_getenv(t_canvas *x)
+{
+    if (!x) bug("canvas_getenv");
+    while (!x->gl_env)
+        if (!(x = x->gl_owner))
+            bug("t_canvasenvironment", x);
+    return (x->gl_env);
+}
+
+int canvas_getdollarzero( void)
+{
+    t_canvas *x = canvas_getcurrent();
+    t_canvasenvironment *env = (x ? canvas_getenv(x) : 0);
+    if (env)
+        return (env->ce_dollarzero);
+    else return (0);
+}
+
+void canvas_getargs(int *argcp, t_atom **argvp)
+{
+    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+    *argcp = e->ce_argc;
+    *argvp = e->ce_argv;
+}
+
+t_symbol *canvas_realizedollar(t_canvas *x, t_symbol *s)
+{
+    t_symbol *ret;
+    char *name = s->s_name;
+    if (*name == '$' && name[1] >= '0' && name[1] <= '9')
+    {
+        t_canvasenvironment *env = canvas_getenv(x);
+        canvas_setcurrent(x);
+        ret = binbuf_realizedollsym(gensym(name+1),
+            env->ce_argc, env->ce_argv, 1);
+        canvas_unsetcurrent(x);
+    }
+    else ret = s;
+    return (ret);
+}
+
+t_symbol *canvas_getcurrentdir(void)
+{
+    t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+    return (e->ce_dir);
+}
+
+t_symbol *canvas_getdir(t_canvas *x)
+{
+    t_canvasenvironment *e = canvas_getenv(x);
+    return (e->ce_dir);
+}
+
+void canvas_makefilename(t_canvas *x, char *file, char *result, int resultsize)
+{
+    char *dir = canvas_getenv(x)->ce_dir->s_name;
+    if (file[0] == '/' || (file[0] && file[1] == ':') || !*dir)
+    {
+        strncpy(result, file, resultsize);
+        result[resultsize-1] = 0;
+    }
+    else
+    {
+        int nleft;
+        strncpy(result, dir, resultsize);
+        result[resultsize-1] = 0;
+        nleft = resultsize - strlen(result) - 1;
+        if (nleft <= 0) return;
+        strcat(result, "/");
+        strncat(result, file, nleft);
+        result[resultsize-1] = 0;
+    }           
+}
+
+void canvas_rename(t_canvas *x, t_symbol *s, t_symbol *dir)
+{
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_name = s;
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    if (glist_isvisible(x))
+        canvas_reflecttitle(x);
+    if (dir && dir != &s_)
+    {
+        t_canvasenvironment *e = canvas_getenv(x);
+        e->ce_dir = dir;
+    }
+}
+
+/* --------------- traversing the set of lines in a canvas ----------- */
+
+int canvas_getindex(t_canvas *x, t_gobj *y)
+{
+    t_gobj *y2;
+    int indexno;
+    for (indexno = 0, y2 = x->gl_list; y2 && y2 != y; y2 = y2->g_next)
+        indexno++;
+    return (indexno);
+}
+
+void linetraverser_start(t_linetraverser *t, t_canvas *x)
+{
+    t->tr_ob = 0;
+    t->tr_x = x;
+    t->tr_nextoc = 0;
+    t->tr_nextoutno = t->tr_nout = 0;
+}
+
+t_outconnect *linetraverser_next(t_linetraverser *t)
+{
+    t_outconnect *rval = t->tr_nextoc;
+    int outno;
+    while (!rval)
+    {
+        outno = t->tr_nextoutno;
+        while (outno == t->tr_nout)
+        {
+            t_gobj *y;
+            t_object *ob = 0;
+            if (!t->tr_ob) y = t->tr_x->gl_list;
+            else y = t->tr_ob->ob_g.g_next;
+            for (; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd)) break;
+            if (!ob) return (0);
+            t->tr_ob = ob;
+            t->tr_nout = obj_noutlets(ob);
+            outno = 0;
+            if (glist_isvisible(t->tr_x))
+                gobj_getrect(y, t->tr_x,
+                    &t->tr_x11, &t->tr_y11, &t->tr_x12, &t->tr_y12);
+            else t->tr_x11 = t->tr_y11 = t->tr_x12 = t->tr_y12 = 0;
+        }
+        t->tr_nextoutno = outno + 1;
+        rval = obj_starttraverseoutlet(t->tr_ob, &t->tr_outlet, outno);
+        t->tr_outno = outno;
+    }
+    t->tr_nextoc = obj_nexttraverseoutlet(rval, &t->tr_ob2,
+        &t->tr_inlet, &t->tr_inno);
+    t->tr_nin = obj_ninlets(t->tr_ob2);
+    if (!t->tr_nin) bug("drawline");
+    if (glist_isvisible(t->tr_x))
+    {
+        int inplus = (t->tr_nin == 1 ? 1 : t->tr_nin - 1);
+        int outplus = (t->tr_nout == 1 ? 1 : t->tr_nout - 1);
+        gobj_getrect(&t->tr_ob2->ob_g, t->tr_x,
+            &t->tr_x21, &t->tr_y21, &t->tr_x22, &t->tr_y22);
+        t->tr_lx1 = t->tr_x11 +
+            ((t->tr_x12 - t->tr_x11 - IOWIDTH) * t->tr_outno) /
+                outplus + IOMIDDLE;
+        t->tr_ly1 = t->tr_y12;
+        t->tr_lx2 = t->tr_x21 +
+            ((t->tr_x22 - t->tr_x21 - IOWIDTH) * t->tr_inno)/inplus +
+                IOMIDDLE;
+        t->tr_ly2 = t->tr_y21;
+    }
+    else
+    {
+        t->tr_x21 = t->tr_y21 = t->tr_x22 = t->tr_y22 = 0;
+        t->tr_lx1 = t->tr_ly1 = t->tr_lx2 = t->tr_ly2 = 0;
+    }
+    
+    return (rval);
+}
+
+void linetraverser_skipobject(t_linetraverser *t)
+{
+    t->tr_nextoc = 0;
+    t->tr_nextoutno = t->tr_nout;
+}
+
+/* -------------------- the canvas object -------------------------- */
+int glist_valid = 10000;
+
+void glist_init(t_glist *x)
+{
+        /* zero out everyone except "pd" field */
+    memset(((char *)x) + sizeof(x->gl_pd), 0, sizeof(*x) - sizeof(x->gl_pd));
+    x->gl_stub = gstub_new(x, 0);
+    x->gl_valid = ++glist_valid;
+    x->gl_xlabel = (t_symbol **)t_getbytes(0);
+    x->gl_ylabel = (t_symbol **)t_getbytes(0);
+}
+
+    /* make a new glist.  It will either be a "root" canvas or else
+    its parent will be a "text" object in another window... we don't
+    know which yet. */
+t_canvas *canvas_new(void *dummy, t_symbol *sel, int argc, t_atom *argv)
+{
+    t_canvas *x = (t_canvas *)pd_new(canvas_class);
+    t_canvas *owner = canvas_getcurrent();
+    t_symbol *s = &s_;
+    int vis = 0, width = GLIST_DEFCANVASWIDTH, height = GLIST_DEFCANVASHEIGHT;
+    int xloc = 0, yloc = GLIST_DEFCANVASYLOC;
+    int font = (owner ? owner->gl_font : sys_defaultfont);
+    glist_init(x);
+    x->gl_obj.te_type = T_OBJECT;
+    if (!owner)
+        canvas_addtolist(x);
+    /* post("canvas %x, owner %x", x, owner); */
+
+    if (argc == 5)  /* toplevel: x, y, w, h, font */
+    {
+        xloc = atom_getintarg(0, argc, argv);
+        yloc = atom_getintarg(1, argc, argv);
+        width = atom_getintarg(2, argc, argv);
+        height = atom_getintarg(3, argc, argv);
+        font = atom_getintarg(4, argc, argv);
+    }
+    else if (argc == 6)  /* subwindow: x, y, w, h, name, vis */
+    {
+        xloc = atom_getintarg(0, argc, argv);
+        yloc = atom_getintarg(1, argc, argv);
+        width = atom_getintarg(2, argc, argv);
+        height = atom_getintarg(3, argc, argv);
+        s = atom_getsymbolarg(4, argc, argv);
+        vis = atom_getintarg(5, argc, argv);
+    }
+        /* (otherwise assume we're being created from the menu.) */
+
+    if (canvas_newdirectory->s_name[0])
+    {
+        static int dollarzero = 1000;
+        t_canvasenvironment *env = x->gl_env =
+            (t_canvasenvironment *)getbytes(sizeof(*x->gl_env));
+        env->ce_dir = canvas_newdirectory;
+        env->ce_argc = canvas_newargc;
+        env->ce_argv = canvas_newargv;
+        env->ce_dollarzero = dollarzero++;
+        canvas_newdirectory = &s_;
+        canvas_newargc = 0;
+        canvas_newargv = 0;
+    }
+    else x->gl_env = 0;
+
+    if (yloc < GLIST_DEFCANVASYLOC)
+        yloc = GLIST_DEFCANVASYLOC;
+    if (xloc < 0)
+        xloc = 0;
+    x->gl_x1 = 0;
+    x->gl_y1 = 0;
+    x->gl_x2 = 1;
+    x->gl_y2 = 1;
+    canvas_setbounds(x, xloc, yloc, xloc + width, yloc + height);
+    x->gl_owner = owner;
+    x->gl_name = (*s->s_name ? s : 
+        (canvas_newfilename ? canvas_newfilename : gensym("Pd")));
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_loading = 1;
+    x->gl_willvis = vis;
+    x->gl_edit = !strncmp(x->gl_name->s_name, "Untitled", 8);
+    x->gl_font = sys_nearestfontsize(font);
+    pd_pushsym(&x->gl_pd);
+    return(x);
+}
+
+void canvas_setgraph(t_glist *x, int flag);
+
+static void canvas_coords(t_glist *x, t_symbol *s, int argc, t_atom *argv)
+{
+    x->gl_x1 = atom_getfloatarg(0, argc, argv);
+    x->gl_y1 = atom_getfloatarg(1, argc, argv);
+    x->gl_x2 = atom_getfloatarg(2, argc, argv);
+    x->gl_y2 = atom_getfloatarg(3, argc, argv);
+    x->gl_pixwidth = atom_getintarg(4, argc, argv);
+    x->gl_pixheight = atom_getintarg(5, argc, argv);
+    canvas_setgraph(x, atom_getintarg(6, argc, argv));
+}
+
+    /* make a new glist and add it to this glist.  It will appear as
+    a "graph", not a text object.  */
+t_glist *glist_addglist(t_glist *g, t_symbol *sym,
+    float x1, float y1, float x2, float y2,
+    float px1, float py1, float px2, float py2)
+{
+    static int gcount = 0;
+    int zz;
+    int menu = 0;
+    char *str;
+    t_glist *x = (t_glist *)pd_new(canvas_class);
+    glist_init(x);
+    x->gl_obj.te_type = T_OBJECT;
+    if (!*sym->s_name)
+    {
+        char buf[40];
+        sprintf(buf, "graph%d", ++gcount);
+        sym = gensym(buf);
+        menu = 1;
+    }
+    else if (!strncmp((str = sym->s_name), "graph", 5)
+        && (zz = atoi(str + 5)) > gcount)
+            gcount = zz;
+        /* in 0.34 and earlier, the pixel rectangle and the y bounds were
+        reversed; this would behave the same, except that the dialog window
+        would be confusing.  The "correct" way is to have "py1" be the value
+        that is higher on the screen. */
+    if (py2 < py1)
+    {
+        float zz;
+        zz = y2;
+        y2 = y1;
+        y1 = zz;
+        zz = py2;
+        py2 = py1;
+        py1 = zz;
+    }
+    if (x1 == x2 || y1 == y2)
+        x1 = 0, x2 = 100, y1 = 1, y2 = -1;
+    if (px1 >= px2 || py1 >= py2)
+        px1 = 100, py1 = 20, px2 = 100 + GLIST_DEFGRAPHWIDTH,
+            py2 = 20 + GLIST_DEFGRAPHHEIGHT;
+    x->gl_name = sym;
+    x->gl_x1 = x1;
+    x->gl_x2 = x2;
+    x->gl_y1 = y1;
+    x->gl_y2 = y2;
+    x->gl_obj.te_xpix = px1;
+    x->gl_obj.te_ypix = py1;
+    x->gl_pixwidth = px2 - px1;
+    x->gl_pixheight = py2 - py1;
+    x->gl_font =  (canvas_getcurrent() ?
+        canvas_getcurrent()->gl_font : sys_defaultfont);
+    x->gl_screenx1 = x->gl_screeny1 = 0;
+    x->gl_screenx2 = 240;
+    x->gl_screeny2 = 300;
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_bind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    x->gl_owner = g;
+    x->gl_stretch = 1;
+    x->gl_isgraph = 1;
+    x->gl_obj.te_binbuf = binbuf_new();
+    binbuf_addv(x->gl_obj.te_binbuf, "s", gensym("graph"));
+    if (!menu)
+        pd_pushsym(&x->gl_pd);
+    glist_add(g, &x->gl_gobj);
+    if (glist_isvisible(g))
+        canvas_create_editor(x, 1);
+    return (x);
+}
+
+    /* call glist_addglist from a Pd message */
+void glist_glist(t_glist *g, t_symbol *s, int argc, t_atom *argv)
+{
+    t_symbol *sym = atom_getsymbolarg(0, argc, argv);   
+    float x1 = atom_getfloatarg(1, argc, argv);  
+    float y1 = atom_getfloatarg(2, argc, argv);  
+    float x2 = atom_getfloatarg(3, argc, argv);  
+    float y2 = atom_getfloatarg(4, argc, argv);  
+    float px1 = atom_getfloatarg(5, argc, argv);  
+    float py1 = atom_getfloatarg(6, argc, argv);  
+    float px2 = atom_getfloatarg(7, argc, argv);  
+    float py2 = atom_getfloatarg(8, argc, argv);
+    glist_addglist(g, sym, x1, y1, x2, y2, px1, py1, px2, py2);
+}
+
+    /* return true if the glist should appear as a graph on parent;
+    otherwise it appears as a text box. */
+int glist_isgraph(t_glist *x)
+{
+    return (x->gl_isgraph);
+}
+
+    /* This is sent from the GUI to inform a toplevel that its window has been
+    moved or resized. */
+static void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2)
+{
+    int heightwas = y2 - y1;
+    int heightchange = y2 - y1 - (x->gl_screeny2 - x->gl_screeny1);
+    x->gl_screenx1 = x1;
+    x->gl_screeny1 = y1;
+    x->gl_screenx2 = x2;
+    x->gl_screeny2 = y2;
+    /* post("set bounds %d %d %d %d", x1, y1, x2, y2); */
+    if (!glist_isgraph(x) && (x->gl_y2 < x->gl_y1)) 
+    {
+            /* if it's flipped so that y grows upward,
+            fix so that zero is bottom edge and redraw.  This is
+            only appropriate if we're a regular "text" object on the
+            parent. */
+        float diff = x->gl_y1 - x->gl_y2;
+        t_gobj *y;
+        x->gl_y1 = heightwas * diff;
+        x->gl_y2 = x->gl_y1 - diff;
+            /* and move text objects accordingly; they should stick
+            to the bottom, not the top. */
+        for (y = x->gl_list; y; y = y->g_next)
+            if (pd_checkobject(&y->g_pd))
+                gobj_displace(y, x, 0, heightchange);
+        canvas_redraw(x);
+    }
+}
+
+t_symbol *canvas_makebindsym(t_symbol *s)
+{
+    char buf[MAXPDSTRING];
+    strcpy(buf, "pd-");
+    strcat(buf, s->s_name);
+    return (gensym(buf));
+}
+
+void canvas_reflecttitle(t_canvas *x)
+{
+    char namebuf[MAXPDSTRING];
+    t_canvasenvironment *env = canvas_getenv(x);
+    if (env->ce_argc)
+    {
+        int i;
+        strcpy(namebuf, " (");
+        for (i = 0; i < env->ce_argc; i++)
+        {
+            if (strlen(namebuf) > MAXPDSTRING/2 - 5)
+                break;
+            if (i != 0)
+                strcat(namebuf, " ");
+            atom_string(&env->ce_argv[i], namebuf + strlen(namebuf), 
+                MAXPDSTRING/2);
+        }
+        strcat(namebuf, ")");
+    }
+    else namebuf[0] = 0;
+    sys_vgui("wm title .x%x {%s%c%s - %s}\n", 
+        x, x->gl_name->s_name, (x->gl_dirty? '*' : ' '), namebuf,
+            canvas_getdir(x)->s_name);
+}
+
+void canvas_dirty(t_canvas *x, t_int n)
+{
+    t_canvas *x2 = canvas_getrootfor(x);
+    if ((unsigned)n != x2->gl_dirty)
+    {
+        x2->gl_dirty = n;
+        canvas_reflecttitle(x2);
+    }
+}
+
+    /* the window becomes "mapped" (visible and not miniaturized) or
+    "unmapped" (either miniaturized or just plain gone.)  This should be
+    called from the GUI after the fact to "notify" us that we're mapped. */
+void canvas_map(t_canvas *x, t_floatarg f)
+{
+    int flag = (f != 0);
+    t_gobj *y;
+    if (flag)
+    {
+        if (!glist_isvisible(x))
+        {
+            t_selection *sel;
+            if (!x->gl_havewindow)
+            {
+                bug("canvas_map");
+                canvas_vis(x, 1);
+            }
+            for (y = x->gl_list; y; y = y->g_next)
+                gobj_vis(y, x, 1);
+            for (sel = x->gl_editor->e_selection; sel; sel = sel->sel_next)
+                gobj_select(sel->sel_what, x, 1);
+            x->gl_mapped = 1;
+            canvas_drawlines(x);
+                /* simulate a mouse up so u_main will calculate scrollbars...
+                    ugly! */
+            sys_vgui("pdtk_canvas_mouseup .x%x.c 0 0 0\n", x);
+        }
+    }
+    else
+    {
+        if (glist_isvisible(x))
+        {
+                /* just clear out the whole canvas... */
+            sys_vgui(".x%x.c delete all\n", x);
+                /* alternatively, we could have erased them one by one...
+            for (y = x->gl_list; y; y = y->g_next)
+                gobj_vis(y, x, 0);
+                    ... but we should go through and erase the lines as well
+                    if we do it that way. */
+            x->gl_mapped = 0;
+        }
+    }
+}
+
+void canvas_redraw(t_canvas *x)
+{
+    if (glist_isvisible(x))
+    {
+        canvas_map(x, 0);
+        canvas_map(x, 1);
+    }
+}
+
+/* ----  editors -- perhaps this and "vis" should go to g_editor.c ------- */
+
+static t_editor *editor_new(t_glist *owner)
+{
+    char buf[40];
+    t_editor *x = (t_editor *)getbytes(sizeof(*x));
+    x->e_connectbuf = binbuf_new();
+    x->e_deleted = binbuf_new();
+    x->e_glist = owner;
+    sprintf(buf, ".x%x", (t_int)owner);
+    x->e_guiconnect = guiconnect_new(&owner->gl_pd, gensym(buf));
+    return (x);
+}
+
+static void editor_free(t_editor *x, t_glist *y)
+{
+    glist_noselect(y);
+    guiconnect_notarget(x->e_guiconnect, 1000);
+    binbuf_free(x->e_connectbuf);
+    binbuf_free(x->e_deleted);
+    freebytes((void *)x, sizeof(*x));
+}
+
+    /* recursively create or destroy all editors of a glist and its 
+    sub-glists, as long as they aren't toplevels. */
+void canvas_create_editor(t_glist *x, int createit)
+{
+    t_gobj *y;
+    t_object *ob;
+    if (createit)
+    {
+        if (x->gl_editor)
+            bug("canvas_create_editor");
+        else
+        {
+            x->gl_editor = editor_new(x);
+            for (y = x->gl_list; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd))
+                    rtext_new(x, ob);
+        }
+    }
+    else
+    {
+        if (!x->gl_editor)
+            bug("canvas_create_editor");
+        else
+        {
+            for (y = x->gl_list; y; y = y->g_next)
+                if (ob = pd_checkobject(&y->g_pd))
+                    rtext_free(glist_findrtext(x, ob));
+            editor_free(x->gl_editor, x);
+            x->gl_editor = 0;
+        }
+    }
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class &&
+            ((t_canvas *)y)->gl_isgraph)
+                canvas_create_editor((t_canvas *)y, createit);
+}
+
+    /* we call this when we want the window to become visible, mapped, and
+    in front of all windows; or with "f" zero, when we want to get rid of
+    the window. */
+void canvas_vis(t_canvas *x, t_floatarg f)
+{
+    char buf[30];
+    int flag = (f != 0);
+    if (flag)
+    {
+            /* test if we're already visible and toplevel */
+        if (glist_isvisible(x) && !x->gl_isgraph)
+        {           /* just put us in front */
+#ifdef MSW
+            canvas_vis(x, 0);
+            canvas_vis(x, 1);
+#else
+            sys_vgui("raise .x%x\n", x);
+            sys_vgui("focus .x%x.c\n", x);
+            sys_vgui("wm deiconify .x%x\n", x);  
+#endif
+        }
+        else
+        {
+            canvas_create_editor(x, 1);
+            sys_vgui("pdtk_canvas_new .x%x %d %d +%d+%d %d\n", x,
+                (int)(x->gl_screenx2 - x->gl_screenx1),
+                (int)(x->gl_screeny2 - x->gl_screeny1),
+                (int)(x->gl_screenx1), (int)(x->gl_screeny1),
+                x->gl_edit);
+            canvas_reflecttitle(x);
+            x->gl_havewindow = 1;
+            canvas_updatewindowlist();
+        }
+    }
+    else    /* make invisible */
+    {
+        int i;
+        t_canvas *x2;
+        if (!x->gl_havewindow)
+        {
+                /* bug workaround -- a graph in a visible patch gets "invised"
+                when the patch is closed, and must lose the editor here.  It's
+                probably not the natural place to do this.  Other cases like
+                subpatches fall here too but don'd need the editor freed, so
+                we check if it exists. */
+            if (x->gl_editor)
+                canvas_create_editor(x, 0);
+            return;
+        }
+        glist_noselect(x);
+        if (glist_isvisible(x))
+            canvas_map(x, 0);
+        canvas_create_editor(x, 0);
+        sys_vgui("destroy .x%x\n", x);
+        for (i = 1, x2 = x; x2; x2 = x2->gl_next, i++)
+            ;
+        sys_vgui(".mbar.find delete %d\n", i);
+            /* if we're a graph on our parent, and if the parent exists
+               and is visible, show ourselves on parent. */
+        if (glist_isgraph(x) && x->gl_owner)
+        {
+            t_glist *gl2 = x->gl_owner;
+            canvas_create_editor(x, 1);
+            if (glist_isvisible(gl2))
+                gobj_vis(&x->gl_gobj, gl2, 0);
+            x->gl_havewindow = 0;
+            if (glist_isvisible(gl2))
+                gobj_vis(&x->gl_gobj, gl2, 1);
+        }
+        else x->gl_havewindow = 0;
+        canvas_updatewindowlist();
+    }
+}
+
+    /* we call this on a non-toplevel glist to "open" it into its
+    own window. */
+void glist_menu_open(t_glist *x)
+{
+    if (glist_isvisible(x) && !glist_istoplevel(x))
+    {
+        t_glist *gl2 = x->gl_owner;
+        if (!gl2) 
+            bug("canvas_vis");  /* shouldn't happen but don't get too upset. */
+        else
+        {
+                /* erase ourself in parent window */
+            gobj_vis(&x->gl_gobj, gl2, 0);
+                    /* get rid of our editor (and subeditors) */
+            canvas_create_editor(x, 0);
+            x->gl_havewindow = 1;
+                    /* redraw ourself in parent window (blanked out this time) */
+            gobj_vis(&x->gl_gobj, gl2, 1);
+        }
+    }
+    canvas_vis(x, 1);
+}
+
+int glist_isvisible(t_glist *x)
+{
+    return ((!x->gl_loading) && glist_getcanvas(x)->gl_mapped);
+}
+
+int glist_istoplevel(t_glist *x)
+{
+        /* we consider a graph "toplevel" if it has its own window
+        or if it appears as a box in its parent window so that we
+        don't draw the actual contents there. */
+    return (x->gl_havewindow || !x->gl_isgraph);
+}
+
+int glist_getfont(t_glist *x)
+{
+    return (glist_getcanvas(x)->gl_font);
+}
+
+void canvas_free(t_canvas *x)
+{
+    t_gobj *y;
+    int dspstate = canvas_suspend_dsp();
+    canvas_noundo(x);
+    if (canvas_editing == x)
+        canvas_editing = 0;
+    if (canvas_whichfind == x)
+        canvas_whichfind = 0;
+    glist_noselect(x);
+    while (y = x->gl_list)
+        glist_delete(x, y);
+    canvas_vis(x, 0);
+
+    if (strcmp(x->gl_name->s_name, "Pd"))
+        pd_unbind(&x->gl_pd, canvas_makebindsym(x->gl_name));
+    if (x->gl_env)
+    {
+        freebytes(x->gl_env->ce_argv, x->gl_env->ce_argc * sizeof(t_atom));
+        freebytes(x->gl_env, sizeof(*x->gl_env));
+    }
+    canvas_resume_dsp(dspstate);
+    glist_cleanup(x);
+    gfxstub_deleteforkey(x);        /* probably unnecessary */
+    if (!x->gl_owner)
+        canvas_takeofflist(x);
+}
+
+/* ----------------- lines ---------- */
+
+static void canvas_drawlines(t_canvas *x)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    {
+        linetraverser_start(&t, x);
+        while (oc = linetraverser_next(&t))
+            sys_vgui(".x%x.c create line %d %d %d %d -width %d -tags l%x\n",
+                    glist_getcanvas(x),
+                        t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2, 
+                            (outlet_getsymbol(t.tr_outlet) == &s_signal ? 2:1),
+                                oc);
+    }
+}
+
+void canvas_fixlinesfor(t_canvas *x, t_text *text)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if (t.tr_ob == text || t.tr_ob2 == text)
+        {
+            sys_vgui(".x%x.c coords l%x %d %d %d %d\n",
+                glist_getcanvas(x), oc,
+                    t.tr_lx1, t.tr_ly1, t.tr_lx2, t.tr_ly2);
+        }
+    }
+}
+
+    /* kill all lines for the object */
+void canvas_deletelinesfor(t_canvas *x, t_text *text)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if (t.tr_ob == text || t.tr_ob2 == text)
+        {
+            if (x->gl_editor)
+            {
+                sys_vgui(".x%x.c delete l%x\n",
+                    glist_getcanvas(x), oc);
+            }
+            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+        }
+    }
+}
+
+    /* kill all lines for one inlet or outlet */
+void canvas_deletelinesforio(t_canvas *x, t_text *text,
+    t_inlet *inp, t_outlet *outp)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+    {
+        if ((t.tr_ob == text && t.tr_outlet == outp) ||
+            (t.tr_ob2 == text && t.tr_inlet == inp))
+        {
+            if (x->gl_editor)
+            {
+                sys_vgui(".x%x.c delete l%x\n",
+                    glist_getcanvas(x), oc);
+            }
+            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+        }
+    }
+}
+
+static void canvas_pop(t_canvas *x, t_floatarg fvis)
+{
+    if (fvis != 0)
+        canvas_vis(x, 1);
+    pd_popsym(&x->gl_pd);
+    canvas_resortinlets(x);
+    canvas_resortoutlets(x);
+    x->gl_loading = 0;
+}
+
+void canvas_objfor(t_glist *gl, t_text *x, int argc, t_atom *argv);
+
+
+void canvas_restore(t_canvas *x, t_symbol *s, int argc, t_atom *argv)
+{ /* IOhannes */
+    t_pd *z;
+        /* this should be unnecessary, but sometimes the canvas's name gets
+        out of sync with the owning box's argument; this fixes that */
+    if (argc > 3)
+    {
+        t_atom *ap=argv+3;
+        if (ap->a_type == A_SYMBOL)
+        {
+            char *buf=ap->a_w.w_symbol->s_name, *bufp;
+            if (*buf == '$' && buf[1] >= '0' && buf[1] <= '9')
+            {
+                for (bufp = buf+2; *bufp; bufp++)
+                    if (*bufp < '0' || *bufp > '9')
+                {
+                    SETDOLLSYM(ap, gensym(buf+1));
+                    goto didit;
+                }
+                SETDOLLAR(ap, atoi(buf+1));
+            didit: ;
+            }
+        }
+
+        if (ap->a_type == A_DOLLSYM)
+        {
+            t_canvasenvironment *e = canvas_getenv(canvas_getcurrent());
+            canvas_rename(x, binbuf_realizedollsym(ap->a_w.w_symbol,
+                e->ce_argc, e->ce_argv, 1), 0); 
+        }
+        else if (ap->a_type == A_SYMBOL)
+          canvas_rename(x, argv[3].a_w.w_symbol, 0);
+    }
+    canvas_pop(x, x->gl_willvis);
+
+    if (!(z = gensym("#X")->s_thing)) error("canvas_restore: out of context");
+    else if (*z != canvas_class) error("canvas_restore: wasn't a canvas");
+    else
+    {
+        t_canvas *x2 = (t_canvas *)z;
+        x->gl_owner = x2;
+        canvas_objfor(x2, &x->gl_obj, argc, argv);
+    }
+}
+
+static void canvas_loadbangabstractions(t_canvas *x)
+{
+    t_gobj *y;
+    t_symbol *s = gensym("loadbang");
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class)
+    {
+        if (canvas_isabstraction((t_canvas *)y))
+            canvas_loadbang((t_canvas *)y);
+        else
+            canvas_loadbangabstractions((t_canvas *)y);
+    }
+}
+
+void canvas_loadbangsubpatches(t_canvas *x)
+{
+    t_gobj *y;
+    t_symbol *s = gensym("loadbang");
+    for (y = x->gl_list; y; y = y->g_next)
+        if (pd_class(&y->g_pd) == canvas_class)
+    {
+        if (!canvas_isabstraction((t_canvas *)y))
+            canvas_loadbangsubpatches((t_canvas *)y);
+    }
+    for (y = x->gl_list; y; y = y->g_next)
+        if ((pd_class(&y->g_pd) != canvas_class) &&
+            zgetfn(&y->g_pd, s))
+                pd_vmess(&y->g_pd, s, "");
+}
+
+void canvas_loadbang(t_canvas *x)
+{
+    t_gobj *y;
+    canvas_loadbangabstractions(x);
+    canvas_loadbangsubpatches(x);
+}
+
+    /* When you ask a canvas its size the result is 2 pixels more than what
+    you gave it to open it; perhaps there's a 1-pixel border all around it
+    or something.  Anyway, we just add the 2 pixels back here; seems we
+    have to do this for linux but not MSW; not sure about MacOS. */
+
+#ifdef MSW
+#define HORIZBORDER 0
+#define VERTBORDER 0
+#else
+#define HORIZBORDER 2
+#define VERTBORDER 2
+#endif
+
+static void canvas_relocate(t_canvas *x, t_symbol *canvasgeom,
+    t_symbol *topgeom)
+{
+    int cxpix, cypix, cw, ch, txpix, typix, tw, th;
+    if (sscanf(canvasgeom->s_name, "%dx%d+%d+%d", &cw, &ch, &cxpix, &cypix)
+        < 4 ||
+        sscanf(topgeom->s_name, "%dx%d+%d+%d", &tw, &th, &txpix, &typix) < 4)
+        bug("canvas_relocate");
+            /* for some reason this is initially called with cw=ch=1 so
+            we just suppress that here. */
+    if (cw > 5 && ch > 5)
+        canvas_setbounds(x, txpix, typix,
+            txpix + cw - HORIZBORDER, typix + ch - VERTBORDER);
+}
+
+void canvas_popabstraction(t_canvas *x)
+{
+    newest = &x->gl_pd;
+    pd_popsym(&x->gl_pd);
+    x->gl_loading = 0;
+    canvas_resortinlets(x);
+    canvas_resortoutlets(x);
+}
+
+void canvas_logerror(t_object *y)
+{
+#ifdef LATER
+    canvas_vis(x, 1);
+    if (!glist_isselected(x, &y->ob_g))
+        glist_select(x, &y->ob_g);
+#endif
+}
+
+/* -------------------------- subcanvases ---------------------- */
+
+static void *subcanvas_new(t_symbol *s)
+{
+    t_atom a[6];
+    t_canvas *x, *z = canvas_getcurrent();
+    if (!*s->s_name) s = gensym("/SUBPATCH/");
+    SETFLOAT(a, 0);
+    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
+    SETFLOAT(a+2, GLIST_DEFCANVASWIDTH);
+    SETFLOAT(a+3, GLIST_DEFCANVASHEIGHT);
+    SETSYMBOL(a+4, s);
+    SETFLOAT(a+5, 1);
+    x = canvas_new(0, 0, 6, a);
+    x->gl_owner = z;
+    canvas_pop(x, 1);
+    return (x);
+}
+
+static void canvas_click(t_canvas *x,
+    t_floatarg xpos, t_floatarg ypos,
+        t_floatarg shift, t_floatarg ctrl, t_floatarg alt)
+{
+    canvas_vis(x, 1);
+}
+
+
+    /* find out from subcanvas contents how much to fatten the box */
+void canvas_fattensub(t_canvas *x,
+    int *xp1, int *yp1, int *xp2, int *yp2)
+{
+    t_gobj *y;
+    *xp2 += 50;     /* fake for now */
+    *yp2 += 50;
+}
+
+static void canvas_rename_method(t_canvas *x, t_symbol *s, int ac, t_atom *av)
+{
+    if (ac && av->a_type == A_SYMBOL)
+        canvas_rename(x, av->a_w.w_symbol, 0);
+    else canvas_rename(x, gensym("Pd"), 0);
+}
+
+/* ------------------ table ---------------------------*/
+
+static int tabcount = 0;
+
+static void *table_new(t_symbol *s, t_floatarg f)
+{
+    t_atom a[9];
+    t_glist *gl;
+    t_canvas *x, *z = canvas_getcurrent();
+    if (s == &s_)
+    {
+         char  tabname[255];
+         t_symbol *t = gensym("table"); 
+         sprintf(tabname, "%s%d", t->s_name, tabcount++);
+         s = gensym(tabname); 
+    }
+    if (f <= 1)
+        f = 100;
+    SETFLOAT(a, 0);
+    SETFLOAT(a+1, GLIST_DEFCANVASYLOC);
+    SETFLOAT(a+2, 600);
+    SETFLOAT(a+3, 400);
+    SETSYMBOL(a+4, s);
+    SETFLOAT(a+5, 0);
+    x = canvas_new(0, 0, 6, a);
+
+    x->gl_owner = z;
+
+        /* create a graph for the table */
+    gl = glist_addglist((t_glist*)x, &s_, 0, -1, (f > 1 ? f-1 : 1), 1,
+        50, 350, 550, 50);
+
+    graph_array(gl, s, &s_float, f, 0);
+
+    canvas_pop(x, 0); 
+
+    return (x);
+}
+
+    /* return true if the "canvas" object is an abstraction (so we don't
+    save its contents, fogr example.)  */
+int canvas_isabstraction(t_canvas *x)
+{
+    return (x->gl_env != 0);
+}
+
+    /* return true if the "canvas" object is a "table". */
+int canvas_istable(t_canvas *x)
+{
+    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
+    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
+    int istable = (argc && argv[0].a_type == A_SYMBOL &&
+        argv[0].a_w.w_symbol == gensym("table"));
+    return (istable);
+}
+
+    /* return true if the "canvas" object should be treated as a text
+    object.  This is true for abstractions but also for "table"s... */
+int canvas_showtext(t_canvas *x)
+{
+    t_atom *argv = (x->gl_obj.te_binbuf? binbuf_getvec(x->gl_obj.te_binbuf):0);
+    int argc = (x->gl_obj.te_binbuf? binbuf_getnatom(x->gl_obj.te_binbuf) : 0);
+    int isarray = (argc && argv[0].a_type == A_SYMBOL &&
+        argv[0].a_w.w_symbol == gensym("graph"));
+    return (!isarray);
+}
+
+static void canvas_dodsp(t_canvas *x, int toplevel, t_signal **sp);
+static void canvas_dsp(t_canvas *x, t_signal **sp)
+{
+    canvas_dodsp(x, 0, sp);
+}
+
+    /* get the document containing this canvas */
+t_canvas *canvas_getrootfor(t_canvas *x)
+{
+    if ((!x->gl_owner) || canvas_isabstraction(x))
+        return (x);
+    else return (canvas_getrootfor(x->gl_owner));
+}
+
+/* ------------------------- DSP chain handling ------------------------- */
+
+EXTERN_STRUCT _dspcontext;
+#define t_dspcontext struct _dspcontext
+
+void ugen_start(void);
+void ugen_stop(void);
+
+t_dspcontext *ugen_start_graph(int toplevel, t_signal **sp,
+    int ninlets, int noutlets);
+void ugen_add(t_dspcontext *dc, t_object *x);
+void ugen_connect(t_dspcontext *dc, t_object *x1, int outno,
+    t_object *x2, int inno);
+void ugen_done_graph(t_dspcontext *dc);
+
+    /* schedule one canvas for DSP.  This is called below for all "root"
+    canvases, but is also called from the "dsp" method for sub-
+    canvases, which are treated almost like any other tilde object.  */
+
+static void canvas_dodsp(t_canvas *x, int toplevel, t_signal **sp)
+{
+    t_linetraverser t;
+    t_outconnect *oc;
+    t_gobj *y;
+    t_object *ob;
+    t_symbol *dspsym = gensym("dsp");
+    t_dspcontext *dc;    
+
+        /* create a new "DSP graph" object to use in sorting this canvas.
+        If we aren't toplevel, there are already other dspcontexts around. */
+
+    dc = ugen_start_graph(toplevel, sp,
+        obj_nsiginlets(&x->gl_obj),
+        obj_nsigoutlets(&x->gl_obj));
+
+        /* find all the "dsp" boxes and add them to the graph */
+    
+    for (y = x->gl_list; y; y = y->g_next)
+        if ((ob = pd_checkobject(&y->g_pd)) && zgetfn(&y->g_pd, dspsym))
+            ugen_add(dc, ob);
+
+        /* ... and all dsp interconnections */
+    linetraverser_start(&t, x);
+    while (oc = linetraverser_next(&t))
+        if (obj_issignaloutlet(t.tr_ob, t.tr_outno))
+            ugen_connect(dc, t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
+
+        /* finally, sort them and add them to the DSP chain */
+    ugen_done_graph(dc);
+}
+
+    /* this routine starts DSP for all root canvases. */
+static void canvas_start_dsp(void)
+{
+    t_canvas *x;
+    if (canvas_dspstate) ugen_stop();
+    else sys_gui("pdtk_pd_dsp ON\n");
+    ugen_start();
+    
+    for (x = canvas_list; x; x = x->gl_next)
+        canvas_dodsp(x, 1, 0);
+    
+    canvas_dspstate = 1;
+}
+
+static void canvas_stop_dsp(void)
+{
+    if (canvas_dspstate)
+    {
+        ugen_stop();
+        sys_gui("pdtk_pd_dsp OFF\n");
+        canvas_dspstate = 0;
+    }
+}
+
+    /* DSP can be suspended before, and resumed after, operations which
+    might affect the DSP chain.  For example, we suspend before loading and
+    resume afterward, so that DSP doesn't get resorted for every DSP object
+    int the patch. */
+
+int canvas_suspend_dsp(void)
+{
+    int rval = canvas_dspstate;
+    if (rval) canvas_stop_dsp();
+    return (rval);
+}
+
+void canvas_resume_dsp(int oldstate)
+{
+    if (oldstate) canvas_start_dsp();
+}
+
+    /* this is equivalent to suspending and resuming in one step. */
+void canvas_update_dsp(void)
+{
+    if (canvas_dspstate) canvas_start_dsp();
+}
+
+void glob_dsp(void *dummy, t_symbol *s, int argc, t_atom *argv)
+{
+    int newstate;
+    if (argc)
+    {
+        newstate = atom_getintarg(0, argc, argv);
+        if (newstate && !canvas_dspstate)
+        {
+            sys_set_audio_state(1);
+            canvas_start_dsp();
+        }
+        else if (!newstate && canvas_dspstate)
+        {
+            canvas_stop_dsp();
+            sys_set_audio_state(0);
+        }
+    }
+    else post("dsp state %d", canvas_dspstate);
+}
+
+    /* LATER replace this with a queueing scheme */
+void glist_redrawitem(t_glist *owner, t_gobj *gobj)
+{
+    if (glist_isvisible(owner))
+    {
+        gobj_vis(gobj, owner, 0);
+        gobj_vis(gobj, owner, 1);
+    }
+}
+
+    /* redraw all "scalars" (do this if a drawing command is changed.) 
+    LATER we'll use the "template" information to select which ones we
+    redraw.  */
+static void glist_redrawall(t_glist *gl)
+{
+    t_gobj *g;
+    int vis = glist_isvisible(gl);
+    for (g = gl->gl_list; g; g = g->g_next)
+    {
+        t_class *cl;
+        if (vis && g->g_pd == scalar_class)
+            glist_redrawitem(gl, g);
+        else if (g->g_pd == canvas_class)
+            glist_redrawall((t_glist *)g);
+    }
+}
+
+    /* public interface for above */
+void canvas_redrawallfortemplate(t_canvas *templatecanvas)
+{
+    t_canvas *x;
+        /* find all root canvases */
+    for (x = canvas_list; x; x = x->gl_next)
+        glist_redrawall(x);
+}
+
+/* ------------------------------- setup routine ------------------------ */
+
+    /* why are some of these "glist" and others "canvas"? */
+extern void glist_text(t_glist *x, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_obj(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_bng(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_toggle(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vslider(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_hslider(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+    /* old version... */
+extern void canvas_hdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_hdial(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+    /* new version: */
+extern void canvas_hradio(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vradio(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_vumeter(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_mycnv(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_numbox(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_msg(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_floatatom(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void canvas_symbolatom(t_glist *gl, t_symbol *s, int argc, t_atom *argv);
+extern void glist_scalar(t_glist *canvas, t_symbol *s, int argc, t_atom *argv);
+
+void g_graph_setup(void);
+void g_editor_setup(void);
+void g_readwrite_setup(void);
+extern void graph_properties(t_gobj *z, t_glist *owner);
+
+void g_canvas_setup(void)
+{
+        /* we prevent the user from typing "canvas" in an object box
+        by sending 0 for a creator function. */
+    canvas_class = class_new(gensym("canvas"), 0,
+        (t_method)canvas_free, sizeof(t_canvas), CLASS_NOINLET, 0);
+            /* here is the real creator function, invoked in patch files
+            by sending the "canvas" message to #N, which is bound
+            to pd_camvasmaker. */
+    class_addmethod(pd_canvasmaker, (t_method)canvas_new, gensym("canvas"),
+        A_GIMME, 0);
+    class_addmethod(canvas_class, (t_method)canvas_restore,
+        gensym("restore"), A_GIMME, 0);
+    class_addmethod(canvas_class, (t_method)canvas_coords,
+        gensym("coords"), A_GIMME, 0);
+
+/* -------------------------- objects ----------------------------- */
+    class_addmethod(canvas_class, (t_method)canvas_obj,
+        gensym("obj"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_msg,
+        gensym("msg"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_floatatom,
+        gensym("floatatom"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_symbolatom,
+        gensym("symbolatom"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_text,
+        gensym("text"), A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_glist, gensym("graph"),
+        A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_scalar,
+        gensym("scalar"), A_GIMME, A_NULL);
+
+    /* -------------- Thomas Musil's GUI objects ------------ */
+    class_addmethod(canvas_class, (t_method)canvas_bng, gensym("bng"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_toggle, gensym("toggle"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vslider, gensym("vslider"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hslider, gensym("hslider"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hdial, gensym("hdial"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vdial, gensym("vdial"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_hradio, gensym("hradio"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vradio, gensym("vradio"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vumeter, gensym("vumeter"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_mycnv, gensym("mycnv"),
+                    A_GIMME, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_numbox, gensym("numbox"),
+                    A_GIMME, A_NULL);
+
+/* ------------------------ gui stuff --------------------------- */
+    class_addmethod(canvas_class, (t_method)canvas_pop, gensym("pop"),
+        A_DEFFLOAT, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_loadbang,
+        gensym("loadbang"), A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_relocate,
+        gensym("relocate"), A_SYMBOL, A_SYMBOL, A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_vis,
+        gensym("vis"), A_FLOAT, A_NULL);
+    class_addmethod(canvas_class, (t_method)glist_menu_open,
+        gensym("menu-open"), A_NULL);
+    class_addmethod(canvas_class, (t_method)canvas_map,
+        gensym("map"), A_FLOAT, A_NULL);
+    class_setpropertiesfn(canvas_class, graph_properties);
+
+/* ---------------------- list handling ------------------------ */
+    class_addmethod(canvas_class, (t_method)glist_clear, gensym("clear"),
+        A_NULL);
+
+/* ----- subcanvases, which you get by typing "pd" in a box ---- */
+    class_addcreator((t_newmethod)subcanvas_new, gensym("pd"), A_DEFSYMBOL, 0);
+    class_addcreator((t_newmethod)subcanvas_new, gensym("page"),  A_DEFSYMBOL, 0);
+
+    class_addmethod(canvas_class, (t_method)canvas_click,
+        gensym("click"), A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, 0);
+    class_addmethod(canvas_class, (t_method)canvas_dsp, gensym("dsp"), 0);
+    class_addmethod(canvas_class, (t_method)canvas_rename_method,
+        gensym("rename"), A_GIMME, 0);
+
+/*---------------------------- tables -- GG ------------------- */
+
+    class_addcreator((t_newmethod)table_new, gensym("table"),
+        A_DEFSYM, A_DEFFLOAT, 0);
+
+/* -------------- setups from other files for canvas_class ---------------- */
+    g_graph_setup();
+    g_editor_setup();
+    g_readwrite_setup();
+}