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OnPaint()
{
//...
BitBlt(x,y,...)
//...
}
OnLButtonDown()
{
//...
x=x_origin+dx;
y=y_origin+dy;
Invalidate();//这里不需要BitBlt,Invalidate会使窗口重绘
//...
}
OnLButtonUp()
{
//...
x=x_origin;
y=y_origin;
Invalidate();
//...
}
void CRrrDlg::OnPaint()
{
CPaintDC dc(this); // device context for painting
if(IsIconic())
{
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}else
{
//画图
CBitmap map;
map.LoadBitmap(IDB_BMain);
BITMAP bm;
map.GetBitmap(&bm);
CDC temDC;
temDC.CreateCompatibleDC(&dc);
temDC.SelectObject(&map);
dc.BitBlt(m_nPosX, m_nPosY,bm.bmWidth,bm.bmHeight,&temDC,0,0,SRCCOPY);//m_nPosX, m_nPosY是CRrrDlg的成员变量
CDialog::OnPaint();
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CRrrDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CRrrDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
m_bIsLButtonDown = true;
SetCapture();
CDialog::OnLButtonDown(nFlags, point);
}
void CRrrDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bIsLButtonDown = false;
ReleaseCapture();
CDialog::OnLButtonUp(nFlags, point);
}
void CRrrDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
if(m_bIsLButtonDown)
{
m_nPosX = point.x;
m_nPosY = point.y;
Invalidate();
}
}