Unity3d GUI适应分辨率

float sourceWidth = 1024f;    float sourceHeight = 768f;    float m_fScaleWidth;    float m_fScaleHeight;    void OnGUI()    {        m_fScaleWidth = Screen.width / sourceWidth;        m_fScaleHeight = Screen.height / sourceHeight;        GUI.matrix = Matrix4x4.TRS(new Vector3(0, 0, 0), Quaternion.identity,new Vector3(m_fScaleWidth, m_fScaleHeight, 1));        GUI.Button(new Rect(0, 0, 1024, 768), "");    }