The distance formula, like pythagoras theorem, can be used to determine collision detec tion quite easily.

First off, you must know the points at which the objects are located.

Say object 1 is located at (x1, y1) and object 2 is located at (x2, y2). Both on a 2 dimensional plane.

[IMG]http://www.swiftless.cdadc.com/distance.jpg[/IMG]

Now I must clarify here that sqrt means the square root. There is no square root key on my keyboard, and in most programming languages it is called the sqrt.

Ok now the distance formula is:

D = sqrt( (x2 - x1)^2 + (y2 - y1) ^2)

And if there is a collision, then D must be equal to 0.

That was easy enough. Once again, if you have any questions about this, do not hesitate to ask.