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
[EMAIL PROTECTED]
--
Jeff Fox
[EMAIL PROTECTED]
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