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=51327#51327 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
