MFC画图疑问

rabbit_zizhu 2008-04-01 08:54:17

void CTest1View::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CView::OnLButtonDown(nFlags, point);
this->m_startpoint=point;

CClientDC dc(this);
dc.MoveTo(point);
dc.LineTo(this->m_endpoint);

CView::OnLButtonDown(nFlags,point); ////请问这里是什么意思?}

void CTest1View::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default

CView::OnLButtonUp(nFlags, point);
this->m_endpoint=point;
}

还有一个疑问就是,我用这种方法画直线,每一次都是以前一条直线的终点为起点,而我是想获取当前鼠标的坐标,而不是前一条直线的终点为起点开始画的.请问怎么实现;

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andywiliang 2008-04-05

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顶你

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rabbit_zizhu 2008-04-05

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上个问题我已经解决了.

rabbit_zizhu 2008-04-04

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再问:怎么出现这个错误?

error C2327: '__unnamed::CDC' : member from enclosing class is not a type name, static, or enumerator

很郁闷...

hoohag 2008-04-01

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CClientDC dc(this);
dc.MoveTo(point);
dc.LineTo(this->m_endpoint);
晕死....你为什么在鼠标相应函数里面去操作DC呀, 这样你一移动鼠标, 就会响应一次OnDraw(CDC* pDC)函数, 就把你画在DC上的东西给覆盖了, 看得到东西才奇怪了

rabbit_zizhu 2008-04-01

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void CTest1View::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CView::OnLButtonDown(nFlags, point);

this->m_startpoint=point; ///这里就设置成起点了呀,但是只是第一次.后面我再画直线的话,就以前一条的终点为起点了.

CClientDC dc(this);
dc.MoveTo(point);
dc.LineTo(this->m_endpoint);

CView::OnLButtonDown(nFlags,point);
}