通过C++和GLUT，用OPENGL 实现的 二次 B spline 曲线渲染。

鼠标左键点击，添加控制点，可以随意移动控制点来改变曲线。

适合OPENGL初学者了解曲线生成过程。-Through the C++ And GLUT, using OPENGL realized quadratic B spline curve rendering. Click the left mouse button, add control points, you can move the control point to change the curve. OPENGL for beginner to understand the process of curve generation.