////////////////////////////////////////////////////////////////////////
//
// 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)));
}
////////////////////////////////////////////////////////////////////////
//
// Description:
// Stretch the dragger according to the motion along the plane
// projector
//
// Use: private
//
void
SoTranslate2Dragger::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();
// Convert newHitPt to world space and save this as our new worldRestartPt
getLocalToWorldMatrix().multVecMatrix( newHitPt, worldRestartPt );
// Figure out the translation relative to start position.
SbVec3f motion = newHitPt - startHitPt;
// Maybe we need to constrain the motion...
if ( !shftDown )
translateDir = -1;
else {
// The shift key is pressed. This means 1-D translation.
if ( translateDir == -1 ) {
// The 1-D direction is not defined. Calculate it based on which
// direction got the maximum locater motion.
if ( isAdequateConstraintMotion() ) {
if ( fabs( motion[0]) > fabs( motion[1]))
translateDir = 0;
else
translateDir = 1;
// Set the axis feedback switch to the given direction.
setSwitchValue( axisFeedbackSwitch.getValue(), translateDir );
}
else {
// Not ready to pick a direction yet. Don't move.
return;
}
}
// get the projection of 'motion' onto the preferred axis.
SbVec3f constrainedMotion(0,0,0);
constrainedMotion[translateDir] = motion[translateDir];
motion = constrainedMotion;
}
// Append this to the startMotionMatrix, which we saved at the beginning
// of the drag, to find the current motion matrix.
setMotionMatrix( appendTranslation( getStartMotionMatrix(), motion ) );
}
void TranslateRadialDragger::
drag()
{
// Things can change between renderings. To be safe, update
// the projector with the current values.
lineProj->setViewVolume(getViewVolume());
lineProj->setWorkingSpace(getLocalToWorldMatrix());
// Find the new intersection on the projector.
SbVec3f newHitPt
= lineProj->project(getNormalizedLocaterPosition());
// Get initial point expressed in our current local space.
SbVec3f startHitPt = getLocalStartingPoint();
// Motion in local space is difference between old and
// new positions.
SbVec3f motion = newHitPt - startHitPt;
// Append this to the startMotionMatrix, which was saved
// automatically at the beginning of the drag, to find
// the current motion matrix.
setMotionMatrix( appendTranslation(getStartMotionMatrix(), motion));
}