java - How do you calculate direction of velocity of a circle bouncing off another static circle? -

I've got the code to bounce one another properly for two moving circles, but when the situation is identical to Apply the code One of two moving circles is static and does not move, moving circle seems to be a class of static one. How can I fix this?

If you have code for a circle jumping from a wall, you can guess it By searching the line that will be the tangent of the static circle at the point of contact between the circle and the moving circle drama will bounce from the wall that runs along the line.