copy a wxDC to wxScrolledWindow

[Miguel Cartagena]

The source DC come from another module and is drawn manually. Something
like this:

void BuildDC(){
  wxClientDC dc(this);
  dc.DrawText(_T("TEST"), 10, 10);
  ...
}



On Dec 4, 10:55 am, pstarczew... at o2.pl (Piotr Starczewski) wrote:
> Your code looks ok (didn't test it yet). The only thing is that you
> should put memDC->SelectObject(wxNullBitmap) instead of
> memDC->DrawBitmap. By drawing your bitmap on memDC theoretically you are
> drawing currently selected bitmap on the same bitmap (I'm not sure if
> that is possible with currently drawn bitmap selected into wxMemoryDC
> and I'm not sure how it will behave). I'll test this solution later this
> evening.
>
> You mentioned that "I have a wxDC drawn before, outside my
> application.". What do you mean by that? Are you trying to take a window
> snapshot from external application or does some external application
> "draws" on your dc?
>
> Regards,
> Peter
>
>
>
> Miguel Cartagena wrote:
> > I test this and when I call Blit method, it's draw a print screen .. my
> > IDE.
> > Here the code:
>
> >   dc.GetSize(&w, &h);
> >           // the source DC
> >   wxBitmap bmp(w, h, wxBITMAP_TYPE_BMP);
> >   wxMemoryDC *memDC = new wxMemoryDC();
> >   memDC->SelectObject(bmp);
> >   bmp.SaveFile(_T("c:\\test1.bmp"), wxBITMAP_TYPE_BMP);    // just for
> > test
> >   wxCoord zero = 0;
> >   wxCoord ww = w;
> >   wxCoord hh = h;
>
> >   memDC->Blit(zero, zero, ww, hh, &dc, zero, zero);
> >   bmp.SaveFile(_T("c:\\test2.bmp"), wxBITMAP_TYPE_BMP);   // just for
> > test
>
> >   memDC->DrawBitmap(bmp, 0, 0, false);
>
> >   wxImage img = bmp.ConvertToImage();
> >   img.Rescale(210, 297);
> >   wxBitmap bmpRescaled(img);
>
> >   bmpRescaled.SaveFile(_T("c:\\test3.bmp"), wxBITMAP_TYPE_BMP);   //
> > just for test
>
> > On Dec 4, 9:56 am, pstarczew... at o2.pl (Piotr Starczewski) wrote:
>
> >> That should not be a problem. First of all you need to get a
> >> pointer/reference to your source wxDC. Then just wxDC::Blit it into
> >> wxMemoryDC with selected bitmap. Final step is to rescale your bitmap
> >> and draw it with wxDC::DrawBitmap(...) onto your scrolled window.
>
> >> Regards,
> >> Peter
>
> >> Miguel Cartagena wrote:
>
> >>> Sorry, I'll try to explain the problem better.
>
> >>> I have a wxDC drawn before, outside my application. So, I don't know
> >>> what is drawn in it and I can't "do my drawing"  :)
> >>> What I want to do is: get this DC, rescale to my ScrolledWindow size
> >>> and show it into my ScrolledWindow.
>
> >>> For this, copy the DC it's not enough, I think. A possible solution is
> >>> redraw the DC that I receive on MyScrolledWindow::OnDraw(wxDC& dc)
> >>> method, or something like.
>
> >>> void DCReceiver::ReceiveDC(wxDC& dc){
> >>>   MyScrolledWindow::Draw(dc);
> >>> }
>
> >>> ...
>
> >>> void MyScrolledWindow::Draw(wxDC& dc){
> >>>   dc.Redraw();  // the wxDC::Redraw() method not exists, therefore my
> >>> doubt.
> >>> }
>
> >>> void MyScrolledWindow::OnDraw(wxDC& dc){
> >>>   Draw(dc);  // rewrite the wxScrolledWindow::OnDraw method ?
> >>> }
>
> >>> Thanks and regards,
> >>> Miguel
>
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