http://article.gmane.org/gmane.comp.graphics.openscenegraph.user/49179/match=osgposter
J.P. Delport wrote:
Hi,
also see here for inspiration:
http://forum.openscenegraph.org/viewtopic.php?t=3482
jp
Andrew Thompson wrote:
Hi there,
I'm using the ScreenCaptureHandler to capture a screenshot of the
current view and save it to disk. I would ideally like to save at a
specific resolution, say 1280x1024, however the handler is saving the
image at the current size of the viewer.
My application is a CAD style application so is not full screen. the
user is free to resize the window and that includes the viewer.
Ideally I'd like screenshots to be taken at a fixed size and aspect
ratio.
Anyway here's my code. Can anyone suggest what I could do to adjust
the screenshot size?
BTW - I tried setting the viewport size on the camera but this didn't
result in a larger image, although it did result in the image
appearing to be large enough to fit my target size (It was stretched).
Code:
// Create a screen capture handler to capture the screen to image
osg::ref_ptr<osg::Image> capturedImage;
osg::ref_ptr<osgViewer::ScreenCaptureHandler> screenCaptureHandler =
new osgViewer::ScreenCaptureHandler();
// Create a CWriteToMemoryImageCaptureOperation to get the image out
// NOTE:
// All this does is let me get the image out in memory so I can save it
// What I will eventually do is convert it to .NET Bitmap to pass to
// other parts of my application
osg::ref_ptr<Native::CWriteToMemoryImageCaptureOperation> writeMem =
new Native::CWriteToMemoryImageCaptureOperation();
// Set the capture operation on the screenCaptureHandler
screenCaptureHandler->setCaptureOperation(writeMem);
// Capture the next frame
// viewer is the osgviewer instance
screenCaptureHandler->captureNextFrame(*this->viewer);
// // Perform a Render Operation
//
// Get the default scene camera
osg::Camera * camera = this->viewer->getCamera();
// Update the camera view/projection matrices
camera->setProjectionMatrixAsPerspective(fieldOfView, aspect,
nearClip, farClip);
camera->setViewMatrixAsLookAt(GetCameraPosition(), GetCameraTarget(),
GetUpVector());
// Render the scene
this->viewer->frame();
// Wait for the captured image to be filled
// NOTE: This really needs to be changed. An event should be raised by
// CWriteToMemoryImageCaptureOperation and passed out to calling code
when // the image is ready while(!capturedImage.valid())
{
capturedImage = writeMem->GetImage();
}
// TEST:
// Write the image to file
bool success = osgDB::writeImageFile(*capturedImage,
"C:\\Apps\\Test.bmp");
Thank you!
Cheers,
Andrew
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=18200#18200
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