first commit

js/_drawLine.js

@@ -0,0 +1,21 @@
+//draw a line between two points on canvas
+function line(x0,y0,x1,y1) {
+	
+	var dx = Math.abs(x1-x0);
+	var dy = Math.abs(y1-y0);
+	var sx = (x0 < x1 ? 1 : -1);
+	var sy = (y0 < y1 ? 1 : -1);
+	var err = dx-dy;
+	var breaker = 0;
+
+	while (true) {
+	    //set pixel
+		context.fillRect(x0-Math.floor(brushSize/2), y0-Math.floor(brushSize/2), brushSize, brushSize);
+		
+		//if we've reached the end goal, exit the loop
+		if ((x0==x1) && (y0==y1)) break;
+		var e2 = 2*err;
+		if (e2 >-dy) {err -=dy; x0+=sx;}
+		if (e2 < dx) {err +=dx; y0+=sy;}
+	}
+}