how do i collide two circles?

When the distance between X,Y and EX,EY is smaller than or equal to R1+R2, the collision between two circles occurs. The following formula yields the above-mentioned distance. SQR((EX-X)*(EX-X)+(EY-Y)*(EY-Y))

I made a demo for you, see part one attached.

part two.

part three. The final part. This is the circle intersect checking function.

ok thanks guys!