Algodoo

Good tutorial! Have you considered writing about it in the Algodoo forum in the "Tutorials" section? There you can write much more detail and give other examples and sample scenes.

Thank you! no I did not consider that but I will look in to it!

Programmable version whithout scene.my.* variables:

{
P = Set here the it's position or other position;
S = Set here it's size o just put another;
DX = (P(0) - app.mousepos(0)) > 0 ? P(0) - app.mousepos(0) : math.negate(P(0) - app.mousepos(0));
DY = (P(1) - app.mousepos(1)) > 0 ? P(1) - app.mousepos(1) : math.negate(P(1) - app.mousepos(1));
DY < S(1) / 2 && DX < S(0) / 2
}

If the mouse is in the correct area itwill run whatever script!
Yours do the same thing but i use math.negate instead of use sings (+ -).