Masks
package
{
import flash.display.*;
import flash.events.Event;
public class Main extends Sprite
{
private var circle:Shape;
private var vBox:Shape;
private var up:Boolean = false;
public function Main()
{
super();
stage.scaleMode = "noScale";
circle = new Shape();
circle.graphics.beginFill(0xFF6600, 1);
circle.graphics.drawCircle(250, 250, 250);
vBox = new Shape();
vBox.graphics.beginFill(0x000000, 1);
vBox.graphics.drawRect(0, 0, 1000, 20);
circle.mask = vBox;
addChild(vBox);
addChild(circle);
addEventListener(Event.ENTER_FRAME, scrollVertBox);
}
private function scrollVertBox(event:Event):void
{
if(up)
{
vBox.y -= 2;
} else {
vBox.y += 2;
}
if(vBox.y > 520)
{
up = true;
}
if(vBox.y < 0)
{
up = true;
}
}
}
}