How do I do group sorts?

[bluemagica]

the array contains a bunch of objects, where pairs of objects have a same value for _myId.... Now I want to depth sort the objects in pairs, that is, sort them by their y and keep the objects with same id together. But the function I wrote doesn't seem to be working....any ideas?

private function depthSort():void
		{
			var tempArray:Array = gameObjects;
			tempArray.sortOn(["_myId","y"], [Array.NUMERIC,Array.NUMERIC|Array.DESCENDING]);
			var i:uint = tempArray.length;
			while (i--) 
			{
				trace(tempArray[i].y + " : " + tempArray[i]._myId+" -> "+i);
				if (_world.getChildIndex(tempArray[i]) != i)
				{
					_world.setChildIndex(tempArray[i],i);
				}
			}
		}

[mr_malee]

works for me:

var arr:Array = [];

for (var i:int = 0; i < 200; i++) {
	
	arr.push({ id:int(Math.random() * 100), y:Math.random() * 800 });
}

arr.sortOn(["id", "y"], Array.NUMERIC);

var p:int = 0;

for (i = 0; i < arr.length; i++) {
	
	if (arr[i].id != p) {
		
		trace("");
	}
	
	trace(arr[i].id + " : " + arr[i].y);
	
	p = arr[i].id;
}

paste that in flash and run it, you'll see groups of id's together sorted with lowest y to highest.

[bluemagica]

yeh, that is exactly what I am doing, but it's not working..... my objects are being grouped as per their id, but not sorted as per "y". 1 is is always at index 0, and 2 id is always at index 2....I dunno what I am doing wrong...

[mr_malee]

try this sorting option for now:

tempArray.sortOn(["_myId","y"], Array.NUMERIC);

[bluemagica]

Already tried it, that was the first thing i did

[mr_malee]

maybe post a sample fla then, you've got your "y" property as public? I've heard that using getters for sorting can be buggy.

[bluemagica]

Well I solved the problem for now, by filtering the array for keeping only one object of a group and then sorting it. I don't know how the filter will hit the performance on the long run though....oh well....Thanks for the help mr.malee