canvasquery

1 files changed, 18 insertions, 5 deletions

diff --git a/public/js/draw.js b/public/js/draw.js
index 786b6b6..8bd82df 100644
--- a/public/js/draw.js
+++ b/public/js/draw.js
@@ -1,4 +1,5 @@
 $(function(){
+	if ($("#workspace").length == 0) return;
 	var drawing = false;
 	var color = colors.black;
   var brush = new Brush({ style: 'pencil', color: color, width: 10 });
@@ -60,11 +61,6 @@ $(function(){
 		}
 	}
 	
-	function Point(e, offset) {
-		this.x = e.pageX - offset.left;
-		this.y = e.pageY - offset.top;
-	}
-	
 });
 
 function Brush (b) {
@@ -94,3 +90,20 @@ function Brush (b) {
 	ctx.putImageData(id, 0, 0);
 	$("#drawing").append(canvas);
 }
+
+function Point(e, offset) {
+	this.x = e.pageX - offset.left;
+	this.y = e.pageY - offset.top;
+}
+Point.prototype.add = function(p) {
+	this.x += p.x;
+	this.y += p.y;
+}
+Point.prototype.subtract = function(p) {
+	this.x -= p.x;
+	this.y -= p.y;
+}
+Point.prototype.quantize = function(x, y) {
+	this.x = Math.floor( this.x / x ) * x;
+	this.y = Math.floor( this.y / y ) * y;
+}