March 2014 update

Task/Bitmap-Bresenhams-line-algorithm/CoffeeScript/bitmap-bresenhams-line-algorithm.coffee

@@ -0,0 +1,18 @@
+drawBresenhamLine = (x0, y0, x1, y1) ->
+  dx = Math.abs(x1 - x0)
+  sx = if x0 < x1 then 1 else -1
+  dy = Math.abs(y1 - y0)
+  sy = if y0 < y1 then 1 else -1
+  err = (if dx>dy then dx else -dy) / 2
+
+  loop
+    setPixel(x0, y0)
+    break if x0 == x1 && y0 == y1
+    e2 = err
+    if e2 > -dx
+      err -= dy
+      x0 += sx
+    if e2 < dy
+      err += dx
+      y0 += sy
+  null