kindagravity.txt

I'm not a physicist, but I made a 2D game about gravity/magnetism:
http://experimentalgameplay.com/game.php?g=484
Still, I do not know correct gravity-formulas, so I just pulled of a 
formula to get an factor of attraction wich strongly increases when objects 
get closer to each other. I used this value to accelerate one of the 
objects. Flash code would be something like this:

//at lease you need this vars
private var x1:Number;
private var y1:Number;
private var y1:Number;
private var y2:Number;
private var distance:Number;
private var gravityX:Number;
private var gravityY:Number;

//distance between the coordinates, power of 2
private function function distance(x1:Number, x2:Number, y1:Number, 
y2:Number):Number{
return Math.pow(x1-x2,2) Math.pow(y1-y2,2);
}

//gets values you can use for accellerating objects etc. You can multiply 
them to have a certain grade of ?gravity?
private function setGravity():void{
gravityX=(x1-x2)/distance(x1,x2,y1,y2);
gravityY=(y1-y2)/distance(x1,x2,y1,y2);
}

Wrote it on the fly, so there may be typos... but it should work somehow 
like this. Again, this is not ?real- gravity, but in my case it was quite 
adequate (for 2D, but if you need 3D you can implement it quite easily).

Good luck with your project, Marc