几种画直线的方法-孙鑫C++笔记
// HDC画直线
CPoint m_ptOrigin ;
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
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);
} // CDC画直线
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CDC *pDC = GetDC();
pDC->MoveTo(m_ptOrigin);
pDC->LineTo(point);
ReleaseDC(pDC); CView::OnLButtonUp(nFlags, point);
} // CClientDC、CWindowDC画直线
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CClientDC dc(this); //画到客户区
CClientDC dc(GetParent()); //画到客户区+工具栏
CWindowDC dc(this); //画到客户区
CWindowDC dc(GetParent()); //画到客户区+工具栏+菜单栏+标题栏
CWindowDC dc(GetDesktopWindow()); //画到整个屏幕窗口
dc.MoveTo(m_ptOrigin);
dc.LineTo(point); CView::OnLButtonUp(nFlags, point);
} //带颜色的直线
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CPen pen(PS_SOLID, , RGB(, , ));
CClientDC dc(this);
CPen *pOldPen = dc.SelectObject(&pen);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
dc.SelectObject(pOldPen); CView::OnLButtonUp(nFlags, point);
} //画刷
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CBrush brush(RGB(, , ));
CClientDC dc(this);
dc.FillRect(CRect(m_ptOrigin, point), &brush); CView::OnLButtonUp(nFlags, point);
}
//位图画刷
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
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); CView::OnLButtonUp(nFlags, point);
}
//透明画刷
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
CClientDC dc(this);
// dc.Rectangle(CRect(m_ptOrigin, point)); //不透明
CBrush *pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
CBrush *pOldBrush = dc.SelectObject(pBrush);
dc.Rectangle(CRect(m_ptOrigin, point));
dc.SelectObject(pOldBrush); //透明 CView::OnLButtonUp(nFlags, point);
}
//用画笔写字
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = point;
m_bDraw = TRUE;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bDraw = FALSE;
CView::OnLButtonUp(nFlags, point);
}
void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
CClientDC dc(this);
CPen pen(PS_SOLID, , RGB(, , ));
CPen *pOldPen = dc.SelectObject(&pen);
if(m_bDraw == TRUE)\
{
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
m_ptOrigin = point;
}
dc.SelectObject(pOldPen); CView::OnMouseMove(nFlags, point);
} //画扇形
CPoint m_ptOld;
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_ptOrigin = m_ptOld = point;
m_bDraw = TRUE;
CView::OnLButtonDown(nFlags, point);
}
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bDraw = FALSE;
CView::OnLButtonUp(nFlags, point);
}
void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
CClientDC dc(this);
CPen pen(PS_SOLID, , RGB(, , ));
CPen *pOldPen = dc.SelectObject(&pen);
if(m_bDraw == TRUE)\
{
dc.MoveTo(m_ptOrigin);
dc.LineTo(m_ptOld);
// dc.MoveTo(m_ptOrigin); // 不带边线
dc.MoveTo(m_ptOld); // 带边线
dc.LineTo(point);
m_ptOld = point;
}
dc.SelectObject(pOldPen); CView::OnMouseMove(nFlags, point);
}
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