Flex/ActionScript - rotate Sprite around its center

Question

I have created a Sprite in Actionscript and rendered it to a Flex Canvas. Suppose:

var fooShape:Sprite = new FooSpriteSubclass();

fooCanvas.rawChildren.addChild         


        

Answer 1

/**
* Rotates the object based on its center
* Parameters: @obj => the object to rotate
* @ rotation => angle to rotate
* */
public function RotateAroundCenter(obj:Object, rotation:Number):void
{

var bound:Rectangle = new Rectangle();
// get the bounded rectangle of objects
bound = obj.getRect(this);

// calculate mid poits
var midx1:Number = bound.x + bound.width/2;
var midy1:Number = bound.y + bound.height/2;

// assign the rotation
obj.rotation = rotation;

// assign the previous mid point as (x,y)
obj.x = midx1;
obj.y = midy1;

// get the new bounded rectangle of objects
bound = obj.getRect(this);

// calculate new mid points
var midx2:Number = bound.x + bound.width/2;
var midy2:Number = bound.y + bound.height/2;

// calculate differnece between the current mid and (x,y) and subtract
 //it to position the object in the previous bound.
var diff:Number = midx2 - obj.x;
obj.x -= diff;
diff = midy2 - obj.y;
obj.y -= diff;
}

//////////////////

Usage:

you can use the above function as described below,

var img:Canvas = new Canvas()
RotateAroundCenter(img, rotation);

This will help you

REf: http://subashflash.blogspot.in/2010/08/rotation-of-object-based-on-center.html