checking circular collisions

[dotty]

Hello, I know I can use IntRect() which have some decent methods for working out collisions between them. How would I go about doing this with circular shapes?

[Laurent]

Collision between circles is the simplest thing that you can do. Check if the distance between the centers is less than the sum of both radiuses, and that's it.

[Contadotempo]

Something like:

Code: [Select]

if((x1 - x2)^2 + (y1 - y2)^2 < (radius1 + radius2)^2)
     youhavecollision();

Where x and y  is the position of the center of each circle.
That's pseudo-code of course but I think you can get the idea.