Maybe canvas within a canvas will do the job:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml"; >
<mx:Script>
<![CDATA[
var isPointerStarted = false;
var bx:Number;
var by:Number;
function pointerStart(target) {
if (isPointerStarted) return;
isPointerStarted = true;
bx = target.mouseX;
by = target.mouseY;
}
function pointerReleased(target) {
if (!isPointerStarted) return;
target.lineStyle(2, 0x666666, 100);
target.createChild(arrow(target));
isPointerStarted = false;
//drawing squre on the canves
var ref_mc =
outerCanves.createChild(mx.containers.Canvas,undefined,{width:1000});
ref_mc.fillRect(900, 100, 910, 110, 0x000000, 30);
}
function arrow(target) {
var w = target.mouseX - bx;
var h = target.mouseY - by;
var l = Math.sqrt(w * w + h * h);
var size=8;
var sharpness=0.5;
var s = Math.sin(sharpness);
var c = Math.cos(sharpness);
if(l>0){
w *= size / l;
h *= size / l;
target.moveTo(bx,by);
target.lineTo(target.mouseX, target.mouseY);
target.lineTo(target.mouseX - w * c - s * h,
target.mouseY + w * s - h * c);
target.moveTo(target.mouseX, target.mouseY);
target.lineTo(target.mouseX - w * c + s * h,
target.mouseY - w * s - h * c);
}
}
]]>
</mx:Script>
<mx:Canvas id="outerCanves"
x="0" y="110" width="100%" height="225"
borderStyle="solid"
backgroundColor="#DEE0FE"
backgroundAlpha="0">
<mx:Canvas id="myCanves"
x="0" y="0" width="100%" height="225"
borderStyle="none"
mouseUpSomewhere="pointerReleased(event.target)"
mouseDown="pointerStart(event.target)"
backgroundColor="#DEE0FE"
backgroundAlpha="0">
</mx:Canvas>
</mx:Canvas>
</mx:Application>
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