22 marzo 2001
Claudio Rocchini
52
Visualizzazione in dragging
•void CGrapheditView::drag_arc()
•{
• CDC * dc = GetDC();
• int    old_mode = dc->SetROP2(R2_XORPEN);
• CPen * old_pen  = (CPen *)dc->SelectStockObject( WHITE_PEN );
• dc->MoveTo( start_drag );
• dc->LineTo( end_drag );
• dc->SelectObject( old_pen );
• dc->SetROP2(old_mode);
• ReleaseDC(dc);
•}