create.js canvas path animation

HTML

<script src="http://code.createjs.com/easeljs-0.7.1.min.js"></script>
<div id="info">info</div>
<canvas id="app" width="500" height="800"></canvas>

CSS

body, html, canvas {
                margin:0px;
                padding:0px;
                width: 500px;
                height: 800px;
            }

JavaScript

var info = document.getElementById('info');

var stage = new createjs.Stage('app');
createjs.MotionGuidePlugin.install();
createjs.Ticker.addEventListener("tick", tick);
// enable touch interactions if supported on the current device:
createjs.Touch.enable(stage);
stage.enableMouseOver(10);
stage.mouseMoveOutside = true;// keep tracking the mouse even when it leaves the canvas

var display = new createjs.Container();
var circles = new createjs.Graphics();
    circles.setStrokeStyle(1)
      		.beginStroke(createjs.Graphics.getRGB(255,0,0))
    			.beginFill(createjs.Graphics.getRGB(255,255,255))
    			.drawCircle(0,0,10);
         
//Control vector1          
var cv1 = new createjs.Shape(circles);
    cv1.x = 40;
    cv1.y = 200;
//Control point1   
//Control vector2   
var cv2 = new createjs.Shape(circles);
    cv2.x = 150;
    cv2.y = 360;
//Points to drag
var points = [cv1,cp1,cv2];
//Drag points
for (var p=0, plen=points.length; p<plen; p++) {
	points[p].addEventListener("mousedown", function (evt) {
					evt.preventDefault();
					// bump the target in front of its siblings:
					var o = evt.target;
					o.parent.addChild(o);
					o.offset = {x: o.x - evt.stageX, y: o.y - evt.stageY};
					
	});
  points[p].addEventListener("pressmove", function (evt) {
  	var o = evt.target;
		o.x = evt.stageX + o.offset.x;
		o.y = evt.stageY + o.offset.y;
    draw();
  });
  points[p].addEventListener("pressup", function (evt) {
    draw();
  });
}

//Follow path
var followPath = new createjs.Shape(circles);
    followPath.x = cv1.x;
    followPath.y = cv1.y;

//Create path
var curve = new createjs.Shape();
var midline1 = new createjs.Shape();
var midline2 = new createjs.Shape();

//Add clips and draw to canvas
display.addChild(followPath, curve, midline1, midline2, cv1, cp1, cv2);
stage.addChild(display);
draw();


function draw() {
	//red curves
	curve.graphics.clear();
  curve.graphics.moveTo(cv1.x, cv1.y)
      .setStrokeStyle(1)
      .beginStroke('#f00')
     ...