Comments on: Quick tip: always use global position for hitTestPoint()

By: Jozef Chúťka

Jozef Chúťka — Mon, 19 Sep 2011 07:43:15 +0000

hi Leo, yes I believe your example is ok for hittesting point(0, 0) in someMovingObject against rocks

By: Leo

Leo — Mon, 19 Sep 2011 00:04:09 +0000

First of all, Amazing stuff you have. Awesome website. Congratz… I am way beyond impressed.

Now, I was having a lot of trouble with this issue, and this thread saved me. Here’s what I think rtoprani wanted to say:

What if on the example of code at the top you have the someMovingObject inside somewhere else, and you’d need to do something such as ‘someMovingObject.parent.local.. the way MrKishi is implying.

Say the display list is something like this:

currentLevel.foreGround.someMovingObject

and you want to use the hitTestPoint against an object located at:

currentLevel.foreGround.rocks

How would that look like?

Would this be correct?
//************
var point:Point;
point = currentLevel.foreGround.someMovingObject.localToGlobal(new Point());
currentLevel.foreGround.rocks.hitTestPoint(point.x, point.y, true);
//***********

Is always confusing because I know the hitTestPoint works with the stage coordinates, and this is all done well within a display list with childs… so… just confusing…

Your help would be awesome. Thanks and cheers!!

By: Jozef Chúťka

Jozef Chúťka — Tue, 27 Jul 2010 07:37:48 +0000

@rtoprani Hi, what exatcly is function hitShape()? It seems this one does not exist in AS3, anyway you can use hitTestObject() and this one should work no matter where the objects are parented

By: rtoprani

rtoprani — Tue, 27 Jul 2010 01:36:40 +0000

Hey Jozef,
would it be possible to show how it would be done when ‘hitShape’ (from your example above) is nested a few movieClips below (my_mc1.my_mc.2.hitShape)?

Thanks!

By: Jozef Chúťka

Jozef Chúťka — Thu, 10 Jun 2010 20:54:12 +0000

@MrKishi, sure thing, thnx for noticing that

By: MrKishi

MrKishi — Thu, 10 Jun 2010 17:02:51 +0000

The first method may be slower — but even more importantly, it’s not generic.
I mean, if someMovingObject is inside somewhere else, you’d need to do something such as ‘someMovingObject.parent.local..’. Ugly stuff.