Question: Drag Inertia

[slayerment]

Does anybody know how I could make a MC keep moving a certain amount when I let go after dragging it. I want the distance it goes to be based upon how quick I moved the mouse before I let it go. Thanks for any help.

[strille]

Ok, it's not perfect, but it works. Place this code on a frame:

MovieClip.prototype.onPress = function() {
	this.drag = true;
	this.startDrag(false);
	this.xPos = this._x;
	this.yPos = this._y;
	
	this.onEnterFrame = function() {
		if (this.drag) {
			this.xspeed = this._x - this.xPos; // x mouse speed
			this.yspeed = this._y - this.yPos; // y mouse speed
			this.xPos = this._x;
			this.yPos = this._y;
		} else {
			this._x += this.xSpeed;
			this._y += this.ySpeed;
			this.xSpeed *= 0.8; // decrease x speed by 20%
			this.ySpeed *= 0.8; // decrease y speed by 20%
			if (Math.abs(this.xSpeed) < 0.1 && Math.abs(this.ySpeed) < 0.1) { // if almost no movement, end enterframe loop
				delete this.onEnterFrame;
			}
		}
	}
}

MovieClip.prototype.onMouseUp = function() {
	this.drag = false;
	this.stopDrag();
}

Will make all movie clips on the same timeline "throwable". If you just want an instance to behave like this replace MovieClip.prototype with that instance name.

I've attached a fla also.

[slayerment]

Thank you very much. This is more than perfect!

[berry_lthird]

@strille: This is EXACTLY what I was looking for!

Thank you very much!

FYI: One set of xspeed variables at lines 9 and 10 has the wrong case and should be xSpeed and ySpeed, respectively.