[vtk-developers] Re: GUISupport directory ?
clinton at elemtech.com
Mon Feb 14 11:52:42 EST 2005
Quoting de Boer Ingo <I.deBoer at polytec.de>:
> > The source is in the current CVS (VTK/GUISupport/MFC).
> Thanks... I just took a look at it...
> I have a question. You wrote this:
> // setup the parent window
> I did in my samples something like:
> // setup the parent window
> and set the parent ID. Isn't it necessary to set the parent ID ?
I don't think it is necessary. The only place in the VTK code it makes a
difference is in the resizing window code, which is redundent, because MFC
is already doing that.
> Did you try my samples ?
I didn't. I realize they were there in the bug tracker when I took this
code from the already existing examples and modified it.
> In my opinion, three samples would be needed, MDI,SDI and
> dialog-based. This is what people do. The only trouble
> with the dialog-based application I had, was, that I
> could not do a double click. For the MDI and SDI it worked
We have an MDI and SDI sample already that uses this new class. Do you want
to try it in a dialog?
> In WindowProc you set the focus for the button down.
> Is this necessary ? If yes, shouldn't you set the focus
> also for WM_MOUSEWHEEL and WM_KEYDOWN ?
Doing it on wheel mouse is preference, and I think most people want that. A
window has to have input focus before it can get a key event. So it is
redundent to set focus on key down because it already has focus.
> In the OnSize function, wouldn't a call like
> this->iren->UpdateSize(cx, cy);
> be enough ?
Yeah, it is.
I think it is weird that a window has already been sized and it is told to
be sized again recursively in VTK. That is what iren->UpdateSize does. My
code I had there prevents the recursion from happening and gets the same
The OnPaint function doesn't pass in a CDC to do printing like that. It is
the OnDraw functions from CView that has that. I don't think CWnd has an
Perhaps we have 4 widget classes in there, then some of them can support
printing like that.
> How about extending the OnPaint with printing ?
> Like this (pseudo, taken from my code)
> if ( pDC->IsPrinting() )
> // Obtain the size of the printer page in pixels.
> int cxPage = pDC->GetDeviceCaps(HORZRES);
> int cyPage = pDC->GetDeviceCaps(VERTRES);
> // Get the size of the window in pixels.
> int *size = this->pvtkWin32OpenGLRW->GetSize();
> int cxWindow = size;
> int cyWindow = size;
> float fx = float(cxPage) / float(cxWindow);
> float fy = float(cyPage) / float(cyWindow);
> float scale = min(fx,fy);
> int x = int(scale * float(cxWindow));
> int y = int(scale * float(cyWindow));
> this->pvtkWin32OpenGLRW->SetupMemoryRendering(cxWindow, cyWindow,
> HDC memDC = this->pvtkWin32OpenGLRW->GetMemoryDC();
> // TODO: add draw code for native data here
> if (this->pvtkWin32RenderWI->GetInitialized())
More information about the vtk-developers