Mbed Game / SPI_TFT_ILI9341

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Dependents:   SeeedStudioTFTv21

Fork of SPI_TFT_ILI9341 by Components

Files at this revision

API Documentation at this revision

Revision 3:3d7298360e45, committed 2013-10-18

Comitter:
mazgch
Date:
Fri Oct 18 08:10:41 2013 +0000
Parent:
2:0a16083193a4
Child:
4:f018e272220b
Commit message:
better circle functions

Changed in this revision

SPI_TFT_ILI9341.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/SPI_TFT_ILI9341.cpp	Sun Jul 21 11:57:06 2013 +0000
+++ b/SPI_TFT_ILI9341.cpp	Fri Oct 18 08:10:41 2013 +0000
@@ -320,7 +320,7 @@
 
 void SPI_TFT_ILI9341::circle(int x0, int y0, int r, int color)
 {
-
+#if 0
     int draw_x0, draw_y0;
     int draw_x1, draw_y1;
     int draw_x2, draw_y2;
@@ -424,17 +424,45 @@
         }
     }
     return;
+#else
+    int x = -r, y = 0, err = 2-2*r, e2;
+    do {
+        pixel(x0-x, y0+y,color);
+        pixel(x0+x, y0+y,color);
+        pixel(x0+x, y0-y,color);
+        pixel(x0-x, y0-y,color);
+        e2 = err;
+        if (e2 <= y) {
+            err += ++y*2+1;
+            if (-x == y && e2 <= x) e2 = 0;
+        }
+        if (e2 > x) err += ++x*2+1;
+    } while (x <= 0);
+#endif
 }
 
-void SPI_TFT_ILI9341::fillcircle(int x, int y, int r, int color)
+void SPI_TFT_ILI9341::fillcircle(int x0, int y0, int r, int color)
 {
+#if 0
     int i;
     for (i = 0; i <= r; i++)
-        circle(x,y,i,color);
+        circle(x0,y0,i,color);
+#else
+    int x = -r, y = 0, err = 2-2*r, e2;
+    do {
+        vline(x0-x, y0-y, y0+y, color);
+        vline(x0+x, y0-y, y0+y, color);
+        e2 = err;
+        if (e2 <= y) {
+            err += ++y*2+1;
+            if (-x == y && e2 <= x) e2 = 0;
+        }
+        if (e2 > x) err += ++x*2+1;
+    } while (x <= 0);
+#endif
 }
 
 
-
 void SPI_TFT_ILI9341::hline(int x0, int x1, int y, int color)
 {
     int w;