VC中利用MFC设计绘图程序初步

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　　　　　　　　　推荐：Visual C 图像处理编程讲座　　首先我们说下通过鼠标的移动来绘制直线。　　这里要捕获到鼠标的两个消息：WM_LBUTTONDOWN, WM_LBUTTONUP。响应WM_LBUTTONDOWN消息记录直线的起始点，响应WM_LBUTTONUP消息记录直线的终点并绘制直线。　　好了，我们看看怎么响应。 void CDrawView::OnLButtonDown(UINT nFlags, CPoint point) {　//MessageBox("Left Button Clicks DrawView");　m_ptOrigin = point ; //这里先定义了一个内部变量保存直线的起始点　CView::OnLButtonDown(nFlags, point);} 　　下面看看响应WM_LBUTTONUP消息记录直线的终点并绘制直线。 //方法一void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　HDC hdc;　hdc = ::GetDC(m_hWnd); //调用全局函数　MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,0);　LineTo(hdc,point.x,point.y);　::ReleaseDC(m_hWnd,hdc);　CView::OnLButtonUp(nFlags, point);}//方法二void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CDC *pDC = GetDC();　pDC->MoveTo(m_ptOrigin);　pDC->LineTo(point);　ReleaseDC(pDC);}//方法三void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CClientDC dc(this) ; //CClientDC对象构造的时候就调用了GetDC，析构的时候调用　ReleaseDC ，只能访问客户区　CClientDC dc(GetParent());　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}//方法四void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CWindowDC dc(this) ; //CWindowDC可以访问客户区和非客户区　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CWindowDC dc(GetDesktopWindow()) ; //现在可以访问桌面　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}　　连续线绘图：　　思路：鼠标移动的信号被捕捉到，然后随时响应该信号，绘制图线。　　这里要设置一个BOOL变量 m_bDraw 来判断是否鼠标左键按下了。 //画连续的线条void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　dc.MoveTo(m_ptOrigin); //移动到原来的点　　dc.LineTo(point); //绘制直线 　　m_ptOrigin = point ; //将现在的点赋值给原来的坐标，以便下次调用　}　CView::OnMouseMove(nFlags, point);}//改变画笔的颜色void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　m_ptOrigin = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//画扇型void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//画带边线的扇型void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　dc.MoveTo(m_ptOld);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//看看绘图的模式设置方法void CDrawView::OnMouseMove(UINT nFlags, CPoint point) { 　if ( m_bDraw )　{　　CClientDC dc(this) ;　　dc.SetROP2(R2_BLACK); //绘图的模式设置,始终绘制黑色图形　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　dc.MoveTo(m_ptOld);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}　　到此，我们知道了一般地绘图方法了。 　　　　　　　　　推荐：Visual C 图像处理编程讲座　　首先我们说下通过鼠标的移动来绘制直线。　　这里要捕获到鼠标的两个消息：WM_LBUTTONDOWN, WM_LBUTTONUP。响应WM_LBUTTONDOWN消息记录直线的起始点，响应WM_LBUTTONUP消息记录直线的终点并绘制直线。　　好了，我们看看怎么响应。 void CDrawView::OnLButtonDown(UINT nFlags, CPoint point) {　//MessageBox("Left Button Clicks DrawView");　m_ptOrigin = point ; //这里先定义了一个内部变量保存直线的起始点　CView::OnLButtonDown(nFlags, point);} 　　下面看看响应WM_LBUTTONUP消息记录直线的终点并绘制直线。 //方法一void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　HDC hdc;　hdc = ::GetDC(m_hWnd); //调用全局函数　MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,0);　LineTo(hdc,point.x,point.y);　::ReleaseDC(m_hWnd,hdc);　CView::OnLButtonUp(nFlags, point);}//方法二void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CDC *pDC = GetDC();　pDC->MoveTo(m_ptOrigin);　pDC->LineTo(point);　ReleaseDC(pDC);}//方法三void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CClientDC dc(this) ; //CClientDC对象构造的时候就调用了GetDC，析构的时候调用　ReleaseDC ，只能访问客户区　CClientDC dc(GetParent());　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}//方法四void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CWindowDC dc(this) ; //CWindowDC可以访问客户区和非客户区　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) {　CWindowDC dc(GetDesktopWindow()) ; //现在可以访问桌面　dc.MoveTo(m_ptOrigin);　dc.LineTo(point);}　　连续线绘图：　　思路：鼠标移动的信号被捕捉到，然后随时响应该信号，绘制图线。　　这里要设置一个BOOL变量 m_bDraw 来判断是否鼠标左键按下了。 //画连续的线条void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　dc.MoveTo(m_ptOrigin); //移动到原来的点　　dc.LineTo(point); //绘制直线 　　m_ptOrigin = point ; //将现在的点赋值给原来的坐标，以便下次调用　}　CView::OnMouseMove(nFlags, point);}//改变画笔的颜色void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　m_ptOrigin = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//画扇型void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//画带边线的扇型void CDrawView::OnMouseMove(UINT nFlags, CPoint point) {　if ( m_bDraw )　{　　CClientDC dc(this) ;　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　dc.MoveTo(m_ptOld);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}//看看绘图的模式设置方法void CDrawView::OnMouseMove(UINT nFlags, CPoint point) { 　if ( m_bDraw )　{　　CClientDC dc(this) ;　　dc.SetROP2(R2_BLACK); //绘图的模式设置,始终绘制黑色图形　　CPen pen( PS_SOLID , 1 , RGB(255,128,128) );　　CPen *pOldPen = dc.SelectObject(&pen);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(m_ptOld);　　dc.MoveTo(m_ptOrigin);　　dc.LineTo(point);　　dc.MoveTo(m_ptOld);　　dc.LineTo(point);　　m_ptOld = point ;　　dc.SelectObject(pOldPen);　}　CView::OnMouseMove(nFlags, point);}　　到此，我们知道了一般地绘图方法了。 下载本文示例代码


VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步VC中利用MFC设计绘图程序初步