用c语言画图，实现了一个圆沿45度线直线运动，碰到边界后反弹。用加载图片的方式减少了运动过程中的抖动。（要安装easyX）-C language drawing realized after a round 45-degree line along a straight line, across the border rebound. Pictures by way of reducing the load during exercise jitter. (To install easyX)