From 90f1370bbf7c3a6a21cfb41b637758178da9d553 Mon Sep 17 00:00:00 2001
From: Franklin Wei <frankhwei536@gmail.com>
Date: Wed, 8 Apr 2015 14:15:20 -0400
Subject: Add circle drawing/filling to xlcd

Change-Id: I5d28ade42145d9d82babcf62c0db7948927cafec
---
 apps/plugins/lib/xlcd.h      |   5 +++
 apps/plugins/lib/xlcd_draw.c | 100 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+)

(limited to 'apps')

diff --git a/apps/plugins/lib/xlcd.h b/apps/plugins/lib/xlcd.h
index b6d0867e01..abd5cff62b 100644
--- a/apps/plugins/lib/xlcd.h
+++ b/apps/plugins/lib/xlcd.h
@@ -31,6 +31,11 @@
 void xlcd_filltriangle(int x1, int y1, int x2, int y2, int x3, int y3);
 void xlcd_filltriangle_screen(struct screen* display,
                          int x1, int y1, int x2, int y2, int x3, int y3);
+void xlcd_fillcircle(int cx, int cy, int radius);
+void xlcd_fillcircle_screen(struct screen* display, int cx, int cy, int radius);
+void xlcd_drawcircle(int cx, int cy, int radius);
+void xlcd_drawcircle_screen(struct screen* display, int cx, int cy, int radius);
+
 #if LCD_DEPTH >= 8
 void xlcd_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
                            int stride, int x, int y, int width, int height);
diff --git a/apps/plugins/lib/xlcd_draw.c b/apps/plugins/lib/xlcd_draw.c
index 83ddf68e5c..311782c21f 100644
--- a/apps/plugins/lib/xlcd_draw.c
+++ b/apps/plugins/lib/xlcd_draw.c
@@ -170,6 +170,106 @@ void xlcd_filltriangle_screen(struct screen* display,
         xlcd_filltriangle_vertical(display, x1, y1, x2, y2, x3, y3);
 }
 
+static void xlcd_fillcircle_horizontal(struct screen* display,
+                                       int cx, int cy, int radius)
+{
+    int d = 3 - (radius * 2);
+    int x = 0;
+    int y = radius;
+    while(x <= y)
+    {
+        display->hline(cx - x, cx + x, cy + y);
+        display->hline(cx - x, cx + x, cy - y);
+        display->hline(cx - y, cx + y, cy + x);
+        display->hline(cx - y, cx + y, cy - x);
+        if(d < 0)
+        {
+            d += (x * 4) + 6;
+        }
+        else
+        {
+            d += ((x - y) * 4) + 10;
+            --y;
+        }
+        ++x;
+    }
+}
+
+static void xlcd_fillcircle_vertical(struct screen* display,
+                                     int cx, int cy, int radius)
+{
+    int d = 3 - (radius * 2);
+    int x = 0;
+    int y = radius;
+    while(x <= y)
+    {
+        display->vline(cx + x, cy + y, cy - y);
+        display->vline(cx - x, cy + y, cy - y);
+        display->vline(cy + x, cx + y, cx - y);
+        display->vline(cy - x, cx + y, cx - y);
+        if(d < 0)
+        {
+            d += (x * 4) + 6;
+        }
+        else
+        {
+            d += ((x - y) * 4) + 10;
+            --y;
+        }
+        ++x;
+    }
+}
+
+void xlcd_fillcircle_screen(struct screen* display,
+                            int cx, int cy, int radius)
+{
+    if(display->pixel_format == HORIZONTAL_PACKING || display->depth >= 8)
+        xlcd_fillcircle_horizontal(display, cx, cy, radius);
+    else
+        xlcd_fillcircle_vertical(display, cx, cy, radius);
+}
+
+void xlcd_fillcircle(int cx, int cy, int radius)
+{
+    xlcd_fillcircle_screen(rb->screens[SCREEN_MAIN], cx, cy, radius);
+}
+
+void xlcd_drawcircle_screen(struct screen* display,
+                                   int cx, int cy, int radius)
+{
+    int d = 3 - (radius * 2);
+    int x = 0;
+    int y = radius;
+    while(x <= y)
+    {
+        display->drawpixel(cx + x, cy + y);
+        display->drawpixel(cx - x, cy + y);
+        display->drawpixel(cx + x, cy - y);
+        display->drawpixel(cx - x, cy - y);
+        display->drawpixel(cx + y, cy + x);
+        display->drawpixel(cx - y, cy + x);
+        display->drawpixel(cx + y, cy - x);
+        display->drawpixel(cx - y, cy - x);
+        if(d < 0)
+        {
+            d += (x * 4) + 6;
+        }
+        else
+        {
+            d += ((x - y) * 4) + 10;
+            --y;
+        }
+        ++x;
+    }
+}
+
+void xlcd_drawcircle(int cx, int cy, int radius)
+{
+    /* default is main screen */
+    xlcd_drawcircle_screen(rb->screens[SCREEN_MAIN], cx, cy, radius);
+}
+
+
 #if LCD_DEPTH >= 8 && LCD_DEPTH <= 16
 
 #ifdef HAVE_LCD_COLOR
-- 
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