初始学习VC++,记下点滴...以后还可以看,嘿嘿
绘制线条大家很容易想到了画图软件,简单的通过鼠标左键的点击移动来绘制。
首先建立MFC单文档DrawStraight工程,建立成功之后,在CDrawStraightView(后简称view)新建私有CPoint类型的m_ptOrigin,并在构造函数view中初始化为0;
private:
CPoint m_ptOrigin;
CDrawStraightView::CDrawStraightView()
{
// TODO: add construction code here
m_ptOrigin = 0;
}
我们都知道线都有起点和终点,起点即是鼠标按下,终点是鼠标放开;
故添加消息响应函数OnLButtonDown以及OnLButtonUp;
其中在OnLButtonDown记录下线条起点
void CDrawStraightView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
最后在OnLButtonUp中进行消息处理即可;
void CDrawStraightView::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
//利用sdk全局函数画线
/*
HDC hdc;
hdc=::GetDC(m_hWnd);
MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
LineTo(hdc,point.x,point.y);
::ReleaseDC(m_hWnd,hdc);*/
//利用MFC的CDC类实现画线功能
/*CDC *pDC=GetDC();
pDC->MoveTo(m_ptOrigin);
pDC->LineTo(point);
ReleaseDC(pDC);*/
//利用MFC的CClientDC类实现画线功能
/*CClientDC dc(this);
//CClientDC dc(GetParent());
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);*/
//利用MFC的CWindowDC类实现画线功能
/*CWindowDC dc(this);
//CWindowDC dc(GetParent());
//CWindowDC dc(GetDesktopWindow());
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);*/
//绘制彩色线条
CPen pen(PS_DOT,1,RGB(0,255,0));
CClientDC dc(this);
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
dc.SelectObject(pOldPen);
CView::OnLButtonUp(nFlags, point);
}
一般画线:
可以通过GetParent()可以在工具栏画线(注意线的位置)
以及通过GetDesktopWindow()从而在桌面窗口画:
最后可以通过CPen( intnPenStyle,>CPen pen(PS_DOT,1,RGB(255,0,0)); CClientDC dc(this); CPen *pOldPen=dc.SelectObject(&pen); dc.MoveTo(m_ptOrigin); dc.LineTo(point); dc.SelectObject(pOldPen);
绘制出:
工程免积分下载:http://download.csdn.net/detail/xjm199/6753739
继续学习...o(∩_∩)o