Colision problem

[TheCatsMeow]

What is it you are trying to achieve?
What i want to happen is make my ball bounce of of a paddle.

What is the problem you are having?
What's going wrong is.. my ball will sometimes go through the paddle and will shake, go down and then go back up and shoot off. sometimes it will deflect even if the paddle isn't there.


Describe what you have tried to solve this problem
i've look through my code, and tried changing it a litte.. (Mainly i just changed the checking part of the code)


Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)

Turing:

loop         Draw.FillOval (ballx, bally, 7, 7, yellow)      %This draws the first ball         delay (5)         Draw.FillOval (ballx, bally, 7, 7, black)       %This draws the second ball behind it to make it look like a solid ball         ballx := ballx + changex * dirx             %The directions for the ball.         bally := bally + changey * diry             if (ballx > maxx - 10) or (ballx <= 10) then        %If the ball touchs this spot very left of very right, it deflects                 dirx := dirx * -1             end if             if (bally >= maxy - 311) or (bally <= 240) then     %This sets the ceiling boundaries                 diry := diry * -1             end if             if    (bally >= lpaddley) and (bally <= lpady ) and (ballx <= left_paddle) then     %This is where the ball deflects off the left paddle                 dirx := dirx * -1             elsif (bally >= rpaddley) and (bally <= rpady ) and (ballx >= right_paddle) then    %This makes the ball deflect off the right paddle                 dirx := dirx * -1             end if       end loop

[Tony]

Pick one of the paddles (lets say left) and try to describe in words _all_ of the locations where a ball could be, for it to be deflected. That should point you towards some cases where problems could occur.