畫出一個正方形，四個頂點以 sinθ、cosθ 去決定 以改變θ值來讓圖形產生旋轉效果 並且做出按滑鼠左鍵旋轉，按右鍵停止的功能 旋轉方向隨意 -Draw a square, four vertices sinθ, cosθ to decide to change the value of θ to make graphics made by generating spin and rotate the left mouse button, right-click fea

This program creates beautiful 2d x-y patterns in OpenGL using sin and cos.

使用openGL程序，用实线和虚线画出sin，cos函数的曲线示意图-Use openGL program, with solid and dashed lines drawn sin, cos function curve diagram