Move graphics points at runtime?

Hello, how to get the graphics points and change the values of its x&y at runtime?

for example:

var moveToX:Array = [50, 200];

var moveToY:Array = [0, 0];

var lineToX:Array = [100, 0, 50, 250, 150, 200];

var lineToY:Array = [100, 100, 0, 100, 100, 0];

var _points:Array = [];

var linesIndex:int = 0;

var myShape:Shape = new Shape();

myShape.graphics.lineStyle(3, 0x000000, .2);

myShape.graphics.beginFill(0x666666, .1);

for (var i:uint = 0; i< moveToX.length; i++)

{  

    var _point:Point = new Point(moveToX, moveToY);

    _points.push(_point);

}

for (var p:uint = 0; p< _points.length; p++)

{

        myShape.graphics.moveTo(_points

.x, _points

.y);

        myShape.graphics.lineTo(lineToX[linesIndex], lineToY[linesIndex]);

        myShape.graphics.lineTo(lineToX[linesIndex+1], lineToY[linesIndex+1]);

        myShape.graphics.lineTo(lineToX[linesIndex+2], lineToY[linesIndex+2]);

        linesIndex +=3;

}

myShape.x = 0;

myShape.y = 0;

addChild(myShape);

// Now I want to change the points values and update the shape at runtime, but what I am looking for is NOT to clear and redraw it again.. I am trying to apply the changes directly to the same shape because it has a lot of points and lines as the update will be every 2 milliseconds..

So can you help please? Thnaks.