昨天在《OpenGL中的光照和键盘控制》中的代码的基础上加入了用鼠标来控制旋转，不过自己觉得思路是不正确的，纯属瞎弄。。。
为了识别出用户想要旋转的方向和角度，增加了下面的变量：
enum RotateDirection
{//鼠标控制的旋转方向
EAST,
WEST,
NORTH,
SOUTH
};
RotateDirection direction;
CPoint m_pStart;//起点
CPoint m_pEnd;//终点
bool isMoseDown;//是否左键还按下
然后就是鼠标的事件处理代码了：
void COpenGLDemoView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
this->isMoseDown = TRUE;
this->m_pStart = point;
this->m_pEnd = point;
CView::OnLButtonDown(nFlags, point);
}
void COpenGLDemoView::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
this->isMoseDown = FALSE;
if(this->direction==EAST)
yspeed+=0.5f;
else if(this->direction==WEST)
yspeed-=0.5f;
else if(this->direction==SOUTH)
xspeed+=0.5f;
else if(this->direction==NORTH)
xspeed-=0.5f;
CView::OnLButtonUp(nFlags, point);
}
void COpenGLDemoView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if(this->isMoseDown==false)
{
return;
}
if(point.x>this->m_pEnd.x)
this->direction = EAST;
else if(point.x<this->m_pEnd.x)
this->direction = WEST;
else if(point.y>this->m_pEnd.y)
this->direction = SOUTH;
else if(point.y<this->m_pEnd.y)
this->direction = NORTH;
this->m_pEnd = point;
CView::OnMouseMove(nFlags, point);
}
试了下效果，控制上不是很舒适方便，我觉得自己才旋转的方向判断上应该是不对的，到底如何判断旋转方向呢？
本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2007/08/14/854880.html，如需转载请自行联系原作者
