opengl中任一坐标点旋转后，得到新坐标点的例子。通过glGetFloatv函数获取glRotate变换后的模型视图矩阵，然后乘以当前点坐标，进行旋转变换，得到变换后的坐标点位置信息。并与glRotate函数进行比较。-A mehtod to get the vertex postion after roate. This method is implemented buy using glGetFloatv function to get the ModelView Matrix, Then

帮助初学者学习OpenGL中模型视图矩阵的很好的例子，非原创。-A good example to help a beginner learn the modelview matrix in Open GL.

用于Opengl鼠标点击相关的模型变换类,包括平移、缩放和旋转。-A class used for modelview transformation conjection with mouse click.