angle calculation for pong game

I made a little pong game for fun. I currently set the balls angle using

angle(Paddle.X ,Paddle.Y,Self.X,Self.Y)

now I want the position where the ball hits the paddle to be effective. But I don't want to ignore the angle of collision which is what this does.

I tried some things. but didn't work. So how do I do this?

Thanks dop2000, but I knew I forgot to mention something.

My paddle is moving 360 around the play area. So I can't use X to calculate the angle. the bullet bounce of solids doesn't really work for me either.

I figured I'd go with an easy solution which would be this

((-(Ball.Bullet.AngleOfMotion))+(angle(Paddle.X ,Paddle.Y,Self.X,Self.Y)))/2

but at some angles it seems the ball goes straight through the paddle now

There is probably an easier way, but this code seems to work well:

dropbox.com/s/b7q3vofq8ujqxze/ReflectionAngle.c3p

Thanks a lot dop, could you explain what anglediff actually does? The system expression documentation doesn't explain much.

thanks a lot dop, got it working properly thanks to you!