Diff: draw2D.cpp

Revision:

0:aad987efa134

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/draw2D.cpp	Tue Oct 18 05:54:55 2016 +0000
@@ -0,0 +1,87 @@
+#include <mbed.h>
+#include "draw2D.h"
+#include "ssd1306.h"
+
+SSD1306  LCD_2D;
+
+// draw Bresenham Line
+void Draw2D::drawLine(int x1, int y1, int x2, int y2, int fgColor, int bgColor)
+{
+    int dy = y2 - y1;
+    int dx = x2 - x1;
+    int stepx, stepy;
+
+    if (dy < 0) { dy = -dy;  stepy = -1; } else { stepy = 1; }
+    if (dx < 0) { dx = -dx;  stepx = -1; } else { stepx = 1; }
+    dy <<= 1;        // dy is now 2*dy
+    dx <<= 1;        // dx is now 2*dx
+
+    LCD_2D.drawPixel(x1,y1, fgColor, bgColor);
+    if (dx > dy) 
+    {
+        int fraction = dy - (dx >> 1);  // same as 2*dy - dx
+        while (x1 != x2) 
+        {
+           if (fraction >= 0) 
+           {
+               y1 += stepy;
+               fraction -= dx;          // same as fraction -= 2*dx
+           }
+           x1 += stepx;
+           fraction += dy;              // same as fraction -= 2*dy
+           LCD_2D.drawPixel(x1, y1, fgColor, bgColor);
+        }
+     } else {
+        int fraction = dx - (dy >> 1);
+        while (y1 != y2) {
+           if (fraction >= 0) {
+               x1 += stepx;
+               fraction -= dy;
+           }
+           y1 += stepy;
+           fraction += dx;
+           LCD_2D.drawPixel(x1, y1, fgColor, bgColor);
+        }
+     }
+}
+
+// draw Bresenham Circle
+void Draw2D::drawCircle(int xc, int yc, int r, int fgColor, int bgColor)
+{
+    int x = 0; 
+    int y = r; 
+    int p = 3 - 2 * r;
+    if (!r) return;     
+    while (y >= x) // only formulate 1/8 of circle
+    {
+        LCD_2D.drawPixel(xc-x, yc-y, fgColor, bgColor);//upper left left
+        LCD_2D.drawPixel(xc-y, yc-x, fgColor, bgColor);//upper upper left
+        LCD_2D.drawPixel(xc+y, yc-x, fgColor, bgColor);//upper upper right
+        LCD_2D.drawPixel(xc+x, yc-y, fgColor, bgColor);//upper right right
+        LCD_2D.drawPixel(xc-x, yc+y, fgColor, bgColor);//lower left left
+        LCD_2D.drawPixel(xc-y, yc+x, fgColor, bgColor);//lower lower left
+        LCD_2D.drawPixel(xc+y, yc+x, fgColor, bgColor);//lower lower right
+        LCD_2D.drawPixel(xc+x, yc+y, fgColor, bgColor);//lower right right
+        if (p < 0) p += 4*(x++) + 6; 
+        else p += 4*((x++) - y--) + 10; 
+     } 
+}
+
+void Draw2D::drawRectangle(int x0, int y0, int x1, int y1, int fgColor, int bgColor)
+{
+    int x,y, tmp;
+    if (x0>x1) { tmp = x1; x1 = x0; x0 = tmp; }
+    if (y0>y1) { tmp = y1; y1 = y0; y0 = tmp; }
+    for (x=x0; x<=x1; x++) LCD_2D.drawPixel(x,y0,fgColor, bgColor);
+    for (y=y0; y<=y1; y++) LCD_2D.drawPixel(x0,y,fgColor, bgColor);
+    for (x=x0; x<=x1; x++) LCD_2D.drawPixel(x,y1,fgColor, bgColor);
+    for (y=y0; y<=y1; y++) LCD_2D.drawPixel(x1,y,fgColor, bgColor);       
+}
+
+void Draw2D::drawTriangle(int x0, int y0, int x1, int y1, int x2, int y2, int fgColor, int bgColor)
+{
+    drawLine(x0, y0, x1, y1, fgColor, bgColor);
+    drawLine(x1, y1, x2, y2, fgColor, bgColor);
+    drawLine(x0, y0, x2, y2, fgColor, bgColor);
+}
+