Creating area where movie clip can moving but can not go away from this area

Question

I want make somethin line first movie clip must moving in second movie clip, but can not go away from second movie clip.

stage.addEventListener(KeyboardEvent.KEY_DOWN, starMoving);
function starMoving(event:KeyboardEvent):void
{
     switch (event.keyCode)
     {
          case Keyboard.UP : star_mc.y-=10;
          break;
          case Keyboard.DOWN : star_mc.y+=10;
          break;
          case Keyboard.LEFT : star_mc.x=star_mc.x-10;
          break;
          case Keyboard.RIGHT : star_mc.x+=10;
          break;
          default:
          break;
     }
}

So this is the code for manipulate first movie clip.. i can go everywhere on the stage...

How i can make then first movie clip moved just in second?

Thank you.

Anonymous · Accepted Answer

Whenever you move, you need to test the extents to see if you're still in bounds. I'll use right for an example, you can do the rest.

case Keyboard.RIGHT : 
     star_mc.x+=10;
     if(star_mc.x + star_mc.width > containerClip.x + containerClip.width){
          star_mc.x = containerClip.x + containerClip.width - star_mc.width;
     }
     break;

kglad · Answer

you can check the pixelBounds property of each of the movieclip's transform property to see if one is completely within the other.

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