////////////////////////////////////////////////////////////////////////
//
// Description:
// Rotate the rotateDiscDragger based on mouse motion.
//
// Use: private
//
void
SoRotateDiscDragger::drag()
//
////////////////////////////////////////////////////////////////////////
{
// Set up the projector space and view.
// Working space is space at end of motion matrix.
planeProj->setViewVolume( getViewVolume() );
planeProj->setWorkingSpace( getLocalToWorldMatrix() );
// Get newHitPt and startHitPt in workspace.
SbVec3f newHitPt
= planeProj->project( getNormalizedLocaterPosition());
SbVec3f startHitPt = getLocalStartingPoint();
// Find the amount of rotation
SbVec3f oldVec = startHitPt;
SbVec3f newVec = newHitPt;
// Remove the part of these vectors that is parallel to the normal
oldVec -= SbVec3f( 0, 0, oldVec[2] );
newVec -= SbVec3f( 0, 0, newVec[2] );
// deltaRot is how much we rotated since the mouse button went down.
SbRotation deltaRot = SbRotation( oldVec, newVec );
// Append this to the startMotionMatrix, which we saved at the beginning
// of the drag, to find the current motion matrix.
setMotionMatrix(
appendRotation( getStartMotionMatrix(), deltaRot, SbVec3f(0,0,0)));
}
void AsMatrix3D::appendRotation(float degrees, const AsVector3D_ref& axis)
{
appendRotation(degrees, axis, AS_NULL);
}
