# A question about masking capabilities

**URL:** <https://forum.kirupa.com/t/a-question-about-masking-capabilities/295210>\
**Category:** flash\
**Created:** [August 26, 2009, 5:25pm UTC](https://forum.kirupa.com/t/a-question-about-masking-capabilities/295210 "2009-08-26T17:25:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![arafasse](https://avatars.discourse-cdn.com/v4/letter/a/a88e4f/32.png) [@arafasse](https://forum.kirupa.com/u/arafasse)\
**Post date:** [August 26, 2009, 5:25pm UTC](https://forum.kirupa.com/t/a-question-about-masking-capabilities/295210/1 "2009-08-26T17:25:57Z")

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Hello! 🙂

I’m a new Flash CS4 user, and am having tons of fun exploring all its incredible features! I’ve been busy building a website for my boss, and have run into an apparent limitation in the software. I would like to have a column of translucent, rotating rectangles; as they overlap, the shared regions change color. I had hoped to accomplish this with masks (that is, having a block of color that is only visible when and where two rectangles intersect), but I don’t think there is a way to have a mask depend on the motion of two symbols - or is there? Alternatively, I have experimented with Actionscript and the intersection method of the flash.geom.Rectangle class, but have had no luck with that either.

If someone could point me in the right direction - or let me know if this is even possible -I would very much appreciate it. Thanks in advance for your help!