Never mind; I solved this problem by overriding Dragger::handle (GUIEventAdapter &, GUIActionAdapter & ) and using a PolytopeIntersector in place of the LineSegmentIntersector it was using before. This picks up my line geometry so I no longer need the triangle strip, and I can specify the polytope in screen coordinates.
Cheers, Michael mschan01 wrote: > Hi, > > I am trying to add a circle to my application that the user can resize by > dragging. I subclassed osgManipulator::Dragger, and in > setupDefaultGeometry() I draw a circle with lines, then another circle with a > triangle strip which is then hidden (this is used as the draggable area, > since the intersection doesn't work too well with lines). So if my visible > circle has radius R, then the triangle strip has a width W and its vertices > are two circles of radius R+W/2 and R-W/2. Then on a mouse drag I calculate > the new radius, and apply a uniform scaling on the dragger. > > This works, but it has a disadvantage in that the draggable area (W) scales > as well. I'd like the draggable area to be a constant size from the visible > circle. That is, I would like W to be constant in screen coordinates. I > could probably accomplish this by recalculating all of the vertices after > each mouse release, but this seems inefficient. Is there a better way to do > what I am describing? > > ... > > Thank you! > > Cheers, > Michael ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=51353#51353 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
