void
ArcBall_Update (void)
{
int setSize = setSizes[axisSet];
HVect *set = (HVect *)(sets[axisSet]);
vFrom = MouseOnSphere(vDown, center, radius);
vTo = MouseOnSphere(vNow, center, radius);
if (dragging)
{
if (axisSet!=NoAxes)
{
vFrom = ConstrainToAxis(vFrom, set[axisIndex]);
vTo = ConstrainToAxis(vTo, set[axisIndex]);
}
qDrag = Qt_FromBallPoints(vFrom, vTo);
qNow = Qt_Mul(qDrag, qDown);
}
else
{
if (axisSet!=NoAxes) axisIndex = NearestConstraintAxis(vTo, set, setSize);
}
Qt_ToBallPoints(qDown, &vrFrom, &vrTo);
Qt_ToMatrix(Qt_Conj(qNow), mNow); /* Gives transpose for GL. */
}
void Trackball::GetCurrentRotation(double *returnRot)
{
Mat4d tempRot;
Qt_ToMatrix(mCurrQuat,tempRot);
for(int x=0;x<4;x++)
{ for(int y=0;y<4;y++)
{returnRot[4*x+y]=tempRot[y][x];}
}
}
void Trackball::GetCurrentRotation(Mat4d & returnRot)
{
Qt_ToMatrix(mCurrQuat,returnRot);
}