OpenGL：二维几何变换②
使用通用基准点通用基准点旋转也就是设置图形围绕某一点旋转。实例：void draw1(){ glBegin(GL_POLYGON); // 多边形 glColor3f(1.0, 1.0, 1.0); glVertex3f(-0.5, -0.5, 0); glColor3f(1.0, 0, 0); glVertex3f(-0.5, 0.5, 0); glColor3f(0, 0, 1.0); glVertex3f(0.5, 0.5, 0); glColor3f(0, 1.0, 0); g
