Re: Collision detection NOT using hitTest()

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Collision detection NOT using hitTest()
\ Jeff Fox (23 Feb 2007)
. \ T. Michael Keesey (23 Feb 2007)

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Subject:	Re: Collision detection NOT using hitTest()
Group:	Flashcoders
From:	T. Michael Keesey
Date:	23 Feb 2007

Look into flash.geom.Rectangle, specifically the intersects(Rectangle) method.

On 2/23/07, Jeff Fox <jfox015> wrote:
> Hey gang,
> I have a map movie that needs to test whether two near objects will overlap
> one another BEFORE I actually instantiate and draw the movie clip, so I need
> a good object collision test that does not use hitTest(). I have a set of x
> and y and size properties for each object that I use to place them when
> they're created, but what I want to do is if the objects will overlap at any
> point, merge them into a single object.
>
> Here's an example of what I need to catch:
>
> Point A Los Angeles (x: 150, y: 99, size: 8 pixels)
> Point B: San Diego (x: 153, y: 103, size: 8 pixels)
>
> When drawn, the LA dot and San Diego dot will overlap a little and therefore
> cause a problem rendering pop-up content, so I want to merge them. What I
> need is a reliable check to see if that happens. Right now I'm using:
>
> var uLeftX:Number = cityA._x - 2;
> var lRightX:Number = (cityA._x + _size) +2;
> var uLefttY:Number = cityA._y - 2;
> var lRightY:Number = (cityA._y + _size) +2;
>
> if (mapObjects.length > 1) {
> for (var mo:Number = 0; mo < mapObjects.length; mo++) {
> // GET VISIBLE AREA OF CURRENT MAP OBJECT
> var tmpULeftX:Number = parseInt(mapObjects[mo]._x) - 2;
> var tmplRightX:Number = (parseInt(mapObjects[mo]._x) + _dotSize) +2;
>
> var tmpuLeftY:Number = parseInt(mapObjects[mo]._y) - 2;
> var tmplRightY:Number = (parseInt(mapObjects[mo]._y) + _dotSize) +2;
> if ((uLeftX > tmpULeftX && uLeftX < tmplRightX) && (uLefttY >
> tmpuLeftY && uLefttY < tmplRightY)) {
> trace("Dot collision occures between " + cityA.cityName + " and
> " + mapObjects[mo].cityName);
> }
> } // END for
> } // END if
>
> The above script DOES detect collisions, but not between the LA and San
> Deigo properties listed above. Can anyone see a flaw in the line that tests
> the overlap?
>
> -Jeff
> --
> Jeff Fox
> jfox015
>
> --
> Jeff Fox
> jfox015
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--
T. Michael Keesey
Director of Technology
Exopolis, Inc.
2894 Rowena Avenue Ste. B
Los Angeles, California 90039
--
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