Hi Michael, I'm rather cold on this topic as I'm no Qt expert but from a general perspective of how osgGA::EventQueue::mouseScroll() and osgGA::GUIEventAdapter work together one should expect the X,Y values return for a scroll event to be of the previous mouse x,y position and the mouse coordinates previous set up in EventQueue. The X,Y values won't be directly related to the mouse scroll event itself, the values for the scroll event are encoded in the GUIEventAdaopter::ScrollingMotion value.
Robert. On 19 August 2012 20:46, Michael Schanne <michael.scha...@gmail.com> wrote: > Hi, > > I'm seeing something strange with mouse wheel (SCROLL) events in > GUIEventAdapter. My app is a Qt app set up following the osgviewerQt > example. I am trying to implement zooming with the mouse where the zoom > follows the mouse cursor. In some cases I want to zoom with mouse clicks, > and in other cases I want to use the mouse wheel. Zooming was not working > correctly when I used the mouse wheel. I noticed that for SCROLL events, the > x and y min/max were always -1 / +1, which caused > GUIEventAdapter::getX/Ynormalized() to return the wrong values. So, I > figured I would just use getX/Y() instead and use inverse viewport matrix to > get the normalized device coordinates. But, then I noticed I was still > getting inconsistent values for the Y coordinate. For a RELEASE event, the > GUIEventAdapter has Y_INCREASING_DOWNWARDS for the y orientation, and getY() > returns 0 in the top left corner of the window. For a SCROLL event, it has > Y_INCREASING_UPWARDS and getY() returns 0 in the bott om > left corner. Why are the two event types inconsistent? Is there some > attribute I am forgetting to set somewhere? > > I am using OSG 3.0.0 and Qt 4.7. > > ... > > Thank you! > > Cheers, > Michael > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=49332#49332 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
