绘制函数并用动画模拟任意函数的积分过程（几种方法可选），借助calcstar可任意输入方程。有功能视频。 环境：vs2015+of_v0_9_3-Draw any equations on the screen and simulate the integration process with several methods.With calcstar you can input any equations.Environment:vs2015+of_0_9_3