Revision 17:d7e48335953e, committed 2013-10-18

Comitter:

dreschpe

Date:

Fri Oct 18 09:11:57 2013 +0000

Parent:

12:9de056a58793

Commit message:

Better circle function from Michael Ammann

Changed in this revision

--- a/SPI_TFT.cpp	Tue Mar 05 15:47:00 2013 +0000
+++ b/SPI_TFT.cpp	Fri Oct 18 09:11:57 2013 +0000
@@ -22,6 +22,7 @@
 // 21.09.12 fix Bug in BMP_16 
 // 11.10.12 patch from Hans Bergles to get SPI1 working again
 // 03.02.13 add a switch to switch off DMA use for LPC11U24
+// 18.10.13 Better Circle function from Michael Ammann
 
 #include "SPI_TFT.h"
 #include "mbed.h"
@@ -408,118 +409,36 @@
 
 
 void SPI_TFT::circle(int x0, int y0, int r, int color)
-{
-
-    int draw_x0, draw_y0;
-    int draw_x1, draw_y1;
-    int draw_x2, draw_y2;
-    int draw_x3, draw_y3;
-    int draw_x4, draw_y4;
-    int draw_x5, draw_y5;
-    int draw_x6, draw_y6;
-    int draw_x7, draw_y7;
-    int xx, yy;
-    int di;
-    //WindowMax();
-    if (r == 0) {       /* no radius */
-        return;
-    }
-
-    draw_x0 = draw_x1 = x0;
-    draw_y0 = draw_y1 = y0 + r;
-    if (draw_y0 < height()) {
-        pixel(draw_x0, draw_y0, color);     /* 90 degree */
-    }
-
-    draw_x2 = draw_x3 = x0;
-    draw_y2 = draw_y3 = y0 - r;
-    if (draw_y2 >= 0) {
-        pixel(draw_x2, draw_y2, color);    /* 270 degree */
-    }
-
-    draw_x4 = draw_x6 = x0 + r;
-    draw_y4 = draw_y6 = y0;
-    if (draw_x4 < width()) {
-        pixel(draw_x4, draw_y4, color);     /* 0 degree */
-    }
-
-    draw_x5 = draw_x7 = x0 - r;
-    draw_y5 = draw_y7 = y0;
-    if (draw_x5>=0) {
-        pixel(draw_x5, draw_y5, color);     /* 180 degree */
-    }
-
-    if (r == 1) {
-        return;
-    }
-
-    di = 3 - 2*r;
-    xx = 0;
-    yy = r;
-    while (xx < yy) {
-
-        if (di < 0) {
-            di += 4*xx + 6;
-        } else {
-            di += 4*(xx - yy) + 10;
-            yy--;
-            draw_y0--;
-            draw_y1--;
-            draw_y2++;
-            draw_y3++;
-            draw_x4--;
-            draw_x5++;
-            draw_x6--;
-            draw_x7++;
+{  
+    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;
         }
-        xx++;
-        draw_x0++;
-        draw_x1--;
-        draw_x2++;
-        draw_x3--;
-        draw_y4++;
-        draw_y5++;
-        draw_y6--;
-        draw_y7--;
-
-        if ( (draw_x0 <= width()) && (draw_y0>=0) ) {
-            pixel(draw_x0, draw_y0, color);
-        }
-
-        if ( (draw_x1 >= 0) && (draw_y1 >= 0) ) {
-            pixel(draw_x1, draw_y1, color);
-        }
-
-        if ( (draw_x2 <= width()) && (draw_y2 <= height()) ) {
-            pixel(draw_x2, draw_y2, color);
-        }
-
-        if ( (draw_x3 >=0 ) && (draw_y3 <= height()) ) {
-            pixel(draw_x3, draw_y3, color);
-        }
-
-        if ( (draw_x4 <= width()) && (draw_y4 >= 0) ) {
-            pixel(draw_x4, draw_y4, color);
-        }
-
-        if ( (draw_x5 >= 0) && (draw_y5 >= 0) ) {
-            pixel(draw_x5, draw_y5, color);
-        }
-        if ( (draw_x6 <=width()) && (draw_y6 <= height()) ) {
-            pixel(draw_x6, draw_y6, color);
-        }
-        if ( (draw_x7 >= 0) && (draw_y7 <= height()) ) {
-            pixel(draw_x7, draw_y7, color);
-        }
-    }
-    return;
+        if (e2 > x) err += ++x*2+1;
+    } while (x <= 0);
+        
 }
 
-void SPI_TFT::fillcircle(int x, int y, int r, int color)
+void SPI_TFT::fillcircle(int x0, int y0, int r, int color)
 {
-    int i;
-    for (i = 0; i <= r; i++)
-        circle(x,y,i,color);
+    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);
 }
 
 
@@ -1084,6 +1003,7 @@
         } while ((LPC_SSP1->SR & 0x10) == 0x10); // SPI FIFO not empty
     }
 #else // use mbed lib
+    bitmap_ptr += ((h - 1)* (w + padd));
     _spi.format(8,3);                             // 8 bit Mode 3
     _spi.write(SPI_START | SPI_WR | SPI_DATA);    // Write : RS = 1, RW = 0
     _spi.format(16,3);                            // switch to 16 bit Mode 3