MFC之设备描述表DC、画笔Pen、画刷Brush

1.利用SDK全局函数实现画线功能

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
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);

CView::OnLButtonUp(nFlags, point);
}

2.利用MFC的CDC类实现画线功能

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CDC *pDC=GetDC();
pDC->MoveTo(m_ptOrigin);
pDC->LineTo(point);
ReleaseDC(pDC);

CView::OnLButtonUp(nFlags, point);
}

3.利用MFC的CClientDC类实现画线功能

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CClientDC dc(this);
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);

CView::OnLButtonUp(nFlags, point);
}

4.利用MFC的CWindewDC类实现画线功能

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CWindowDC dc(this);
//CWindowDC dc(GetParent());
//CWindowDC dc(GetDesktopWindow());
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);

CView::OnLButtonUp(nFlags, point);
}

5.绘制彩色线条

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
dc.SelectObject(pOldPen);

CView::OnLButtonUp(nFlags, point);
}

6.使用画刷绘图

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CBrush brush(RGB(255,0,0));
CClientDC dc(this);
dc.FillRect(CRect(m_ptOrigin,point),&brush);

CView::OnLButtonUp(nFlags, point);
}

7.位图画刷

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);
CBrush brush(&bitmap);
CClientDC dc(this);
dc.FillRect(CRect(m_ptOrigin,point),&brush);

CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
CBrush *pOldBrush=dc.SelectObject(pBrush);
dc.Rectangle(CRect(m_ptOrigin,point));
dc.SelectObject(pOldBrush);

CView::OnLButtonUp(nFlags, point);
}

8.透明画刷

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CClientDC dc(this);
CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
CBrush *pOldBrush=dc.SelectObject(pBrush);
dc.Rectangle(CRect(m_ptOrigin,point));
dc.SelectObject(pOldBrush);

CView::OnLButtonUp(nFlags, point);
}

9.绘制连续线条

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bDraw=FALSE;

CView::OnLButtonUp(nFlags, point);
}

void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
CClientDC dc(this);
if(m_bDraw==TRUE)
{
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
m_ptOrigin=point;
}

CView::OnMouseMove(nFlags, point);
}

10.绘制扇形效果的线条

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bDraw=FALSE;

CView::OnLButtonUp(nFlags, point);
}

void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
CPen pen(PS_SOLID,1,RGB(255,0,0));
CPen *pOldPen=dc.SelectObject(&pen);
if(m_bDraw==TRUE)
{
dc.SetROP2(R2_BLACK);
dc.MoveTo(m_ptOrigin);
//dc.LineTo(point);
dc.LineTo(m_ptOld);
//dc.MoveTo(m_ptOrigin);
dc.MoveTo(m_ptOld);
dc.LineTo(point);
//m_ptOrigin=point;
m_ptOld=point;
}
dc.SelectObject(pOldPen);
CView::OnMouseMove(nFlags, point);
}