Bitmap/Bresenham's line algorithm: Difference between revisions

Content added Content deleted

Inline

@@ Line 618: / Line 618: @@
             .Save("line.png", ImageFormat.Png);
     }
-    static Bitmap DrawLine(this Bitmap screen, int x0, int y0, int x1, int y1, Color color)
+    static Bitmap DrawLine(this Bitmap bitmap, int x0, int y0, int x1, int y1, Color color)
     {
         int dx = Math.Abs(x1 - x0), sx = x0 < x1 ? 1 : -1;
         int dy = Math.Abs(y1 - y0), sy = y0 < y1 ? 1 : -1;
-        int err = (dx > dy ? dx : -dy) / 2;
+        int err = (dx > dy ? dx : -dy) / 2, e2;
-        do {
+        for(;;) {
-            screen.SetPixel(x0, y0, color);
+            bitmap.SetPixel(x0, y0, color);
-            var e2 = err;
+            if (x0 == x1 && y0 == y1) break;
+            e2 = err;
             if (e2 > -dx) { err -= dy; x0 += sx; }
             if (e2 < dy) { err += dx; y0 += sy; }
-        } while (x0 != x1 || y0 != y1);
+        }
-        screen.SetPixel(x1, y1, color);
+        return bitmap;
-        return screen;
     }
 }</lang>