VC++重绘问题，第一个InvalidateRect(pDoc->m_rectEllipse);为什么说是擦除原来位置的椭圆？求高手解答！
voidCMyView::OnMouseMove(UINTnFlags,CPointpoint){//TODO:Addyourmessagehandlercodehere...
void CMyView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CMyDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if(pDoc->m_bCaptured)
{
InvalidateRect(pDoc->m_rectEllipse);
CSize offset(point-pDoc->m_pointMouse);
pDoc->m_rectEllipse += offset;
InvalidateRect(pDoc->m_rectEllipse);
pDoc->m_pointMouse = point;
}
CView::OnMouseMove(nFlags, point);
} 展开
{
// TODO: Add your message handler code here and/or call default
CMyDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if(pDoc->m_bCaptured)
{
InvalidateRect(pDoc->m_rectEllipse);
CSize offset(point-pDoc->m_pointMouse);
pDoc->m_rectEllipse += offset;
InvalidateRect(pDoc->m_rectEllipse);
pDoc->m_pointMouse = point;
}
CView::OnMouseMove(nFlags, point);
} 展开
1个回答
展开全部
InvalidateRect(pDoc->m_rectEllipse);立即重绘pDoc->m_rectEllipse
查看OnPaint或者OnDraw函数
查看OnPaint或者OnDraw函数
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