Best way to attach clip to middle

[flashpipe1]

I've got a line with several (five for now) points on it and I need to have the user slide the points back & forth along the line...no problem yet...

Now, I've got to have an indicator that stays on the middle point. No problem if I just drag the middle point back and forth between the others, however, if I drag the middle point past one of the points next to it, I need the indicator to stay with the NEW middle point while still dragging the original point.

What would be a good way to determine which point is the "middle?" I was thinking of starting an onEnterFrame to call a function when they startDrag to create an associative array with point number & x value, sort by x value and return the middle value...but it seems like there should be an easier way...

Any ideas??

[dawsonk]

Off the top of my head, I'm just not seeing anything easier than what you described ... Maybe some code will fuel someone else's brain...

stop();
//
var ptAry = [{x:50}, {x:100}, {x:150}, {x:200}, {x:250}];
var numPts = ptAry.length;
var midPt = Math.floor(numPts / 2);
//
for (var i = 0; i < numPts; i++) {
	var myPt = attachMovie("pointMC", "p" + i, i, {_x:ptAry[i].x, _y:200});
	ptAry[i].ID = myPt;
	if (i == midPt) {
		myPt.gotoAndStop(2);
	}
	myPt.onPress = startDragging;
	myPt.onRelease = stopDragging;
}
function startDragging() {
	this.startDrag(false, 0, this._y, 500, this._y);
	this.onEnterFrame = function() {
		for (var i = 0; i < numPts; i++) {
			ptAry[i].ID.gotoAndStop(1);
			if (ptAry[i].ID == this) {
				ptAry[i].x = this._x;
			}
		}
		ptAry.sortOn("x", 16);
		ptAry[midPt].ID.gotoAndStop(2);
		//
	};
}
function stopDragging() {
	delete this.onEnterFrame;
	stopDrag();
}

[flashpipe1]

Perfect! That's pretty much what I was thinking, but hadn't thought of setting up the dragging as a function and including the location testing in that...very nice!!

Thanks!!!