如何计算从另一个静态圆弹起的圆的速度方向？

Question

I've got code for two moving circles to bounce off each other properly, but when applying the same code for the situation where one of the two moving circles is static and does not move, the moving circle seems to orbit the static one. How can I fix this?

Answer 1

如果您有从墙弹起的圆的代码，则可以通过在圆之间的接触点找到与静态圆相切的线并假装沿该线延伸的墙反弹的运动圆来近似它。

Answer 2

The article 2-Dimensional Elastic Collisions offers a vector approach to the problem. In particular, "The tangential components of the velocities are not changed by the collision because there is no force along the line tangent to the collision surface. The normal components of the velocities undergo a one-dimensional collision," which conserves momentum and kinetic energy. There's a Java implementation here .