Converting logic to device coordinates

Posted on 2000-04-14
Last Modified: 2013-11-20
I want to set center of coordinate system device to center of client device. Then I want to draw line to point where I click with mouse on client device. Under this is code of my program. Can You explain me where I make logical error?

Thank you and sorry for my bad english!

void CShowStringView::OnLButtonUp(UINT nFlags, CPoint point)
      CClientDC dc(this);
      int c = dc.SetMapMode(MM_LOMETRIC);
      CRect rc;
      CPoint p1(rc.right/2,rc.bottom/2);
      SetViewportOrgEx ( dc, p1.x,p1.y, NULL);
      CPoint p(0,0);
      CPoint a = dc.GetViewportOrg();

        CView::OnLButtonUp(nFlags, point);
Question by:avram032300
1 Comment
LVL 10

Accepted Solution

RONSLOW earned 50 total points
ID: 2716262
just do it all in client coordinates (which is what comes in to LButtonUp) ie. like this:

void CShowStringView::OnLButtonUp(UINT nFlags, CPoint point)
  CRect rc;
  CPoint p1(rc.right/2,rc.bottom/2);
  CClientDC dc(this);
  CView::OnLButtonUp(nFlags, point);

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