Need to make a ball bounce off a circle.

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brian grove 2015-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/217629-need-to-make-a-ball-bounce-off-a-circle

评论： Chad Greene 2015-5-20

I have a pong game that I want to add a function circular bumper to. I already have a way of detecting when the ball enters the circle but now I need to figure out how to make it bounce off the wall of the circle.

My function for bouncing the ball off the walls is

function bounce (tempV)
      %normalize vector
       tempV(1) = tempV(1) ./ (sqrt(tempV(1)^2 + tempV(2)^2));
       tempV(2) =  tempV(2) ./ (sqrt(tempV(1)^2 + tempV(2)^2));
      ballVector = tempV;

and I feed the function something along these lines...

bounce([ballVector(1), -1 * (Y_FACTOR + abs(ballVector(2)))]);

but I can't get it to work for the circle... any ideas?

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Chad Greene 2015-5-20

在 MATLAB Online 中打开

We don't have enough information about your variables. Whether you're giving a talk or writing a report or posting on a forum, always explicitly describe any variable you ever show. If a variable is not relevant, do not show it to us. If a variable is relevant, describe it.

To increase your chances of getting helpful responses, provide a picture of what you're trying to do and some simple working code that we can tinker with.

When I look at your code, all I see is not related to your question, but you can replace

sqrt(tempV(1)^2 + tempV(2)^2)

with

hypot(tempV(1),tempV(2))

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