# What is the best way to make a if statement that activates when a shape hits the outer part of another shape or as some people may call it the outline
**URL:** https://discourse.processing.org/t/what-is-the-best-way-to-make-a-if-statement-that-activates-when-a-shape-hits-the-outer-part-of-another-shape-or-as-some-people-may-call-it-the-outline/34287
**Category:** Beginners
**Created:** [December 25, 2021, 12:51pm UTC](https://discourse.processing.org/t/what-is-the-best-way-to-make-a-if-statement-that-activates-when-a-shape-hits-the-outer-part-of-another-shape-or-as-some-people-may-call-it-the-outline/34287 "2021-12-25T12:51:35Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@parichko](https://discourse.processing.org/u/parichko)
#### Post date: [December 25, 2021, 12:51pm UTC](https://discourse.processing.org/t/what-is-the-best-way-to-make-a-if-statement-that-activates-when-a-shape-hits-the-outer-part-of-another-shape-or-as-some-people-may-call-it-the-outline/34287/1 "2021-12-25T12:51:35Z")
Lets say you are making a game where if a moving circle hits a rect it bounces off . Now the hard thing for me is to make the ball to do something if it hits the outline of the shape cause I need to make if x \> x-width/2 (it there a easier way)
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### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [December 25, 2021, 1:14pm UTC](https://discourse.processing.org/t/what-is-the-best-way-to-make-a-if-statement-that-activates-when-a-shape-hits-the-outer-part-of-another-shape-or-as-some-people-may-call-it-the-outline/34287/2 "2021-12-25T13:14:46Z")
Hello,
here is an online book: [Collision Detection](http://jeffreythompson.org/collision-detection/point-rect.php)
maybe this can help you
Warm regards,
Chrisir
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### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [December 25, 2021, 1:16pm UTC](https://discourse.processing.org/t/what-is-the-best-way-to-make-a-if-statement-that-activates-when-a-shape-hits-the-outer-part-of-another-shape-or-as-some-people-may-call-it-the-outline/34287/3 "2021-12-25T13:16:46Z")
[CrHallberg.com/CollisionDetection/Website/circle-rect.html](http://CrHallberg.com/CollisionDetection/Website/circle-rect.html)