Pushing Particles Away From The Mouse?

Feb 9, 2010

I've been working on a little particle generator that produces intractable particles. When you click your mouse, they will move in a straight line away from where you clicked. Seems simple enough, but I can't quite get the formula right.

I want to pass two points and a magnitude scalar value into a function and have it move the particle along the line drawn through the two points, and only as far as the magnitude specifics.

For example:Let's say the particle is at the point P(10,10) and the mouse clicks at the point Q(15,15). I pass both those points and the magnitude 10, into my function.

The function then calculates the angle the particle should travel (45 degrees or PI/4 radians) and sends the particle to the point O(20,20), again, as specified by a magnitude of 10.

Edit: By the way, I'm using ActionScript 3.0, but if possible I would prefer a universal explanation in case I decide to program this in another language, or I am without a programming language when I need to figure it out.

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So I've been working on a little particle generator that produces intractable particles. When you click your mouse, they will move in a straight line away from where you clicked. Seems simple enough, but I can't quite get the formula right.

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