Introduction - If you have any usage issues, please Google them yourself
The program with a different color ball trajectory to draw an abstract picture. Seven balls were red, green, blue, black, white, indigo, orange and yellow. The top of the canvas ball equal distance intervals, respectively, on the same flight, but each movement of the ball speed is gradually reduced. The first ball the fastest, from the first ball to the sixth ball speed gradually decreases, and the direction is counterclockwise movement of the ball, the ball is the seventh clockwise movement. Simulation of the trajectory of the ball of light reflection. Normal to the boundary line for the symmetry axis of symmetry, that is a straight line trajectory the ball incident angle equal to the reflection angle.