Question

用VC++6.0写的绘画程序，画出椭圆为什么会这样子

ove(UINT void CYang_JieView::OnMouseMnFlags, CPoint point){ // TODO: Add your message handler code here and/or call default if(m_dragging)

{
CClientDC dc(this);dc.SetROP2(R2_NOT);
CBrush brush;brush.CreateSolidBrush(m_color);CBrush* pOldBrush = dc.SelectObject(&brush);dc.SelectObject(pOldBrush);
switch(m_shape) { case 3: //dc.SelectObject(brush); CRgn rgn; rgn.CreateEllipticRgn(m_pointorg.x,m_pointorg.y,point.x,point.y); dc.Ellipse(m_pointorg.x,m_pointorg.y,m_pointold.x,m_pointold.y); dc.Ellipse(m_pointorg.x,m_pointorg.y,point.x,point.y); dc.FillRgn(&rgn,&brush); } m_pointold=point; //dc.SelectObject(oldPen); dc.SelectObject(pOldBrush); } CView::OnMouseMove(nFlags, point);}

Answer 1

推测一下：m_pointorg m_pointold初始化是不是为0？

追问

应该不是吧
void CYang_JieView::OnLButtonDown(UINT nFlags, CPoint point)
{
m_dragging=true;
m_pointorg=point;
m_pointold=point;
CView::OnLButtonDown(nFlags, point);
}