Hi OSG community,
my application needs "zoom keys". As a result the cursor position
gets centered in the window and depending on key the scene gets
zoomed.
I do this with this short method:
/**A zoom key was pressed (ESC,F1-F5)
*_xand_y is the cursor position in the window scaled to-1.0..+1.0
*/
voidCl_3Dview_osg::handleZoom(double_x,double_y,double_scale){
osg::MatrixoffsetMatrix=
osg::Matrix::scale(_scale,_scale,1.0)*
osg::Matrix::translate(-_scale*_x,_scale*_y,0.0);
view->getCamera()->setProjectionMatrix(view->getCamera()->getProjectionMatrix()*offsetMatrix);
}
The camera has a TrackballManipulator. After my offset is applied the
home position of the manipulator is lost.
I guess I have to control the manipulator instead of the projection
matrix of the camera.
Unfortunately I get stock because I don't manage to convert this
accordingly.
I hope for some help here.
Many thanks for any hints.
- Werner -
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