[vtk-developers] Drawing on a vtkRenderWindow in C#/ActiViz

[David Cole]

Add:

      fi.Update();

before the call to GetOutput. Without it, the output is not properly
populated, and the width and height come back as "-1" which we use as
array indices internal to the "ToBitmap" method, ... which is where
the invalid argument exception comes from.

If you call Update before GetOutput, all should be well, and you
should get a bitmap back.

(Sorry for the delayed response, by the way... Hopefully, later is
better than never...)


Cheers,
David C.


On Sun, Sep 18, 2011 at 3:34 PM, cakbulut <cakbulut at web.de> wrote:
> Hi David,
>
> I have tried the vtkWindowToImageFilter class, but it does not work. I do
> not know where I am making a mistake. Here is my code:
>
>            vtkDICOMImageReader reader = new vtkDICOMImageReader();
>
>            reader.SetDirectoryName("C:\\vtkDev\\Book\\data\\SE000002");
>            reader.Update();
>
>            mapper.SetInput(reader.GetOutput());
>
>            actor = new vtkActor2D();
>            actor.SetMapper(mapper);
>
>            vtkRenderer ren1 =
> renderWindowControl1.RenderWindow.GetRenderers().GetFirstRenderer();
>            vtkRenderWindow renWin = renderWindowControl1.RenderWindow;
>
>            // Add the actors to the renderer, set the window size
>            //
>            ren1.AddViewProp(actor);
>            renWin.SetSize(250, 250);
>
>            vtkWindowToImageFilter fi = new vtkWindowToImageFilter();
>            fi.SetInput(renderWindowControl1.RenderWindow);
>            vtkImageData v = fi.GetOutput();
>
>            try
>            {
>
>                Bitmap bitmap = v.ToBitmap(); *//Here I get Invalid Argument
> Exception*
>                pictureBox1.Image = bitmap;
>            }
>            catch (Exception d)
>            {
>                MessageBox.Show(d.Message);
>            }
>
> Have you got an idea?
>
> Best regards
> cakbulut
>
>
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