有谁知道橡皮擦程序是怎么写的？有小例子吗？

Question

先获得设备说明表
然后再在鼠标的move消息中建立一个rect区域
然后是它无效，并用背景色填充

Answer 1

http://asp.6to23.com/vcprogram/source/sourcefile/ExamTracker.zip 是一个橡皮擦的例子

Answer 2

tingya，你给的那个东东是橡皮擦？？怎么好几种颜色？？

Answer 3

void CMdrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{
m_PointOld=m_PointOrigin=point;
m_Dragging=1;
SetCapture();
RECT rect;
GetClientRect(&rect);
ClientToScreen(&rect);
::ClipCursor(&rect);
CView::OnLButtonDown(nFlags, point);}
void CMdrawView::OnMouseMove(UINT nFlags, CPoint point) 
{
if(m_Dragging)
{
CClientDC ClientDC(this);
ClientDC.SetROP2(R2_NOT); //核心部分
ClientDC.MoveTo(m_PointOrigin);
ClientDC.LineTo(m_PointOld);
ClientDC.MoveTo(m_PointOrigin);
ClientDC.LineTo(point);
m_PointOld=point;
}
}

Answer 4

void CMdrawView::OnLButtonDown(UINT nFlags, CPoint point) {
m_PointOld=m_PointOrigin=point;
m_Dragging=1;
SetCapture();
RECT rect;
GetClientRect(&rect);
ClientToScreen(&rect);
::ClipCursor(&rect);
CView::OnLButtonDown(nFlags, point);}void CMdrawView::OnMouseMove(UINT nFlags, CPoint point) { if(m_Dragging)
{
CClientDC ClientDC(this);
ClientDC.SetROP2(R2_NOT);
ClientDC.MoveTo(m_PointOrigin);
ClientDC.LineTo(m_PointOld);
ClientDC.MoveTo(m_PointOrigin);
ClientDC.LineTo(point);
m_PointOld=point;
}
}
  

Answer 5

不会吧？怎么楼上的代码跟我的一莫一样？跟我学的同一本书吗？
这个问题以前回答过。见
http://www.csdn.net/expert/topic/387/387042.xml?temp=.8120233