[VTK] imaging and MFC

[Klaus Nowikow]

Roland Schwarz wrote:
> 
> Dear VTK Users,
>     does anyone have an example showing how to do
> imaging using the MFC VC++ framework?

Roland,

the key is to tell vtk to draw into an MFC Window.
I did it that way:

In my View class (CCommon3DView), I defined the following member
variables:
vtkWin32OpenGLRenderWindow	*window;
vtkWin32MappedInteractor	*interactor;
vtkRenderer			*renderer;

then:

int CCommon3DView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;

	this->renderer = vtkRenderer::New();
	this->window = vtkWin32OpenGLRenderWindow::New();
	this->window->AddRenderer(this->renderer);
	this->window->SwapBuffersOn();
	this->interactor = vtkWin32MappedInteractor::New();
	this->interactor->SetRenderWindow(this->window);

	/* --- [snip] ---*/

	return 0;
}

and:

void CCommon3DView::OnDraw(CDC* pDC)
{
	if(!this->interactor->GetInitialized())
	{
		CRect	rect;

		/* --- [snip] ---*/
		camera = this->renderer->GetActiveCamera();
		this->GetClientRect(&rect);
		this->interactor->Initialize(this->m_hWnd, &rect, this->window);
		this->renderer->ResetCamera();
	}
	
	camera = this->renderer->GetActiveCamera();

	if(pDC->IsPrinting())
	{
		this->BeginWaitCursor();
		// get size of printer page (in pixels)
		int cxPage = pDC->GetDeviceCaps(HORZRES);
		int cyPage = pDC->GetDeviceCaps(VERTRES);

		int	*size = this->window->GetSize();
		int	cxWindow = size[0],
			cyWindow = size[1];

		float	fx = float(cxPage) / float(cxWindow),
				fy = float(cyPage) / float(cyWindow);
		float	scale = min(fx, fy);
		int	x = int(scale * float(cxWindow)),
			y = int(scale * float(cyWindow));

		this->window->SetupMemoryRendering(cxWindow, cyWindow,
pDC->GetSafeHdc());
		this->window->Render();

		HDC	memDC = this->window->GetMemoryDC();

		StretchBlt(pDC->GetSafeHdc(), 0, 0, x, y, memDC, 0, 0, cxWindow,
cyWindow, SRCCOPY);
		this->window->ResumeScreenRendering();
		this->EndWaitCursor();
	}
	else
	{
		this->interactor->Update();
	}
}


-- 
 Klaus Nowikow

 Vienna University of Technology
 Department of Analytical Chemistry
 Getreidemarkt 9/E151
 A - 1060 Vienna, Austria
 Tel:   +43/1/58801 - 15124
 email: mailto:knowikow at iac.tuwien.ac.at


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