Thomas, in case it will not work (i think that the Dump method requires an
actual visible window, without researching further) you can try to use the
Aspect_PixMap class.
Code snippet:
void ToPixMap(AnsiString Filename, int width, int height)
{
Handle(Aspect_PixMap) aPixMap = myView->ToPixMap(width,height);
aPixMap->Dump(Filename.c_str(),1.);
}
Fotis
On Wed, Dec 9, 2009 at 12:45 PM, Thomas Paviot <tpav...@gmail.com> wrote:
> The screenshot OCC feature is implemented in the V3d_View class (the Dump
> method). Below is copied/pasted the part of the V3d_View.hxx header that
> defines the prototype for this method:
>
> //! dump the full contents of the view with a <br>
>
> //! different scale according to the required sheet <br>
> //! paper size (format) and the ratio <br>
> //! width/height of the view. <br>
> //! and returns FALSE when the dump has failed <br>
>
> //! Warning : the file name extension must be one of <br>
> //! ".xwd",".gif",".bmp" both on UNIX or WNT <br>
> //! but make becarefull about the time to dump and <br>
>
> //! resulting file size especially for the A0 format, <br>
> //! GIF format generates very small <br>
> //! files, BMP and XWD generates big files <br>
> //! (4 to 6 times more than GIF). <br>
>
> //! Time to generates the files is very short with XWD <br>
> //! files and 2 or 4 times more for other format. <br>
> //! NOTE that you can use after any standard system utility <br>
>
> //! for editing or sending the image file to a laser printer. <br>
> //! (i.e: Microsoft Photo Editor on Windows system <br>
> //! or Image Viewer on SUN system) <br>
> Standard_EXPORT Standard_Boolean Dump(const Standard_CString aFile,const
> Aspect_FormatOfSheetPaper aFormat) ;
>
>
> This is how is implemented the display in pythonOCC (Display3d.cpp file):
>
> // Create V3dViewer and V3d_View
> myV3dViewer = new V3d_Viewer( gd , (short* const)"viewer" );
> printf("Viewer created.\n");
> myV3dViewer->Init();
> myV3dViewer->SetDefaultLights();
> myV3dViewer->SetLightOn();
> myV3dView = myV3dViewer->CreateView();
> myV3dView->SetWindow(myWindow);
>
> To be created, a V3d_View just requires that the graphic Device is
> initialized. The last line ( myV3dView->SetWindow(myWindow);) just tells
> that the view should be rendered in myWindow.
>
> So here is my answer to your question: it might be possible to create a
> 'screenshot' (or an OpenGL dump actually) to a file without any X window, by
> only creating a graphic device, V3d_Viewer and V3d_View. It's just has to be
> tested, which I'm going to do right now.
>
> Thomas
>
> 2009/12/9 Simon Loic <simon1l...@gmail.com>
>
> Good point, although generating the web page for the samples won't be an
>> every day activity.
>> Normally, it's possible to achieve off-screen rendering with openGL. As
>> for pythonOCC, OCC (that use openGL eventually) I don't know if this option
>> is available. Tomas will surely know more about it.
>> Loïc
>>
>>
>> On Wed, Dec 9, 2009 at 12:19 AM, Bryan Bishop <kanz...@gmail.com> wrote:
>>
>>> On Tue, Dec 8, 2009 at 5:12 PM, Simon Loic wrote:
>>> > One other question remains, how to automatically create screenshots for
>>> all
>>> > the samples? Shall we add a new function in every sample (eg
>>> > CreateScreenShots) ?
>>>
>>> Does anyone know how to do this *without* requiring X to be installed
>>> and running? Right now the screenshot functions require the window to
>>> be open, and if you switch to something else while the screenshot is
>>> being taken, that other window will be in the way in the saved
>>> screenshot. Thanks.
>>>
>>> - Bryan
>>> http://heybryan.org/
>>> 1 512 203 0507
>>>
>>> _______________________________________________
>>> Pythonocc-users mailing list
>>> Pythonocc-users@gna.org
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>>>
>>
>>
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