Question

This was something I looked at a while back but couldn’t figure it out. Now returning to give it another go.

Basically I want to find out how to check if a movieclip is visible under a mask.
I’ve got a row of thumbs in a movieclip under a mask. Some are out with the the masked area so I’ve got some script to make the movieclip scroll the other thumbs into view of the masked area. Is there any code I can apply to the thumbs to check if they are in or not in view of the masked area?
Any help or insight would be very much appreciated.

Answer 1

You can use Rectangle intersection check to see if the bounds of the mask intersects with the bounds of the thumbs.

var maskBounds : Rectangle = myMask.getBounds(this);
var thumb : MovieClip;
var thumbBounds : Rectangle;

for(var i : int = 0 ; i < _thumbs.length ; i++)
{
    thumb = _thumbs[i];
    thumbBounds = thumb.getBounds(this);

    if(maskBounds.intersects(thumbBounds))
    {
        trace(i, "in view");
    }
}