/* multiplication */
CQuaternion& operator *= ( CQuaternion& cQ1 ) {
CQuaternion cRes;
cRes.fScalar = fScalar*cQ1.fScalar - cQ1.cV.Dot( cV );
cRes.cV = cV.Cross( cQ1.cV ) + cQ1.cV*fScalar + cV*cQ1.fScalar;
cV = cRes.cV;
fScalar = cRes.fScalar;
return *this;
}
CQuaternion operator * ( CQuaternion& cQ1 ) {
return CQuaternion( cV.Cross(cQ1.cV) + cQ1.cV*fScalar + cV*cQ1.fScalar,
fScalar*cQ1.fScalar - cQ1.cV.Dot(cV) );
}
BOOL CRVTrackerDrawPoly::OnRotate()
{
// Get the brush
CEditBrush *pBrush = &m_pView->DrawingBrush();
// Make sure we've got at least three points specified
if (pBrush->m_Points.GetSize() < 3)
return FALSE;
// The origin's point #1
CVector vOrigin = pBrush->m_Points[0];
// The original rotation direction's point #2
CVector vBase = pBrush->m_Points[1];
// The new rotation's point #3
CVector vNew = pBrush->m_Points[2];
// Get the base direction
CVector vBaseDir = vBase - vOrigin;
float fBaseMag = vBaseDir.Mag();
// Don't allow duplicate points
if (fBaseMag < 0.01f)
return TRUE;
vBaseDir *= 1.0f / fBaseMag;
// Get the rotation direction
CVector vNewDir = vNew - vOrigin;
float fNewMag = vNewDir.Mag();
// Don't allow duplicate points
if (fNewMag < 0.01f)
return TRUE;
vNewDir *= 1.0f / fNewMag;
// Get the rotation axis
CVector vRotAxis = vNewDir.Cross(vBaseDir);
// Get the sin of the angle from the cross product
float fRotAngle = vRotAxis.Mag();
// Don't bother if the angle's 0...
if (fRotAngle == 0.0f)
return TRUE;
// Normalize the axis
vRotAxis *= 1.0f / fRotAngle;
// Get the actual angle
fRotAngle = (float)asin(fRotAngle);
// Handle obtuse angles..
if (vBaseDir.Dot(vNewDir) < 0.0f)
fRotAngle = MATH_PI - fRotAngle;
LTMatrix mRotation;
// Get the rotation matrix
mRotation.SetupRot(vRotAxis, fRotAngle);
// Set up an undo..
CEditRegion *pRegion = m_pView->GetRegion();
PreActionList actionList;
for (uint32 nUndoLoop = 0; nUndoLoop < pRegion->m_Selections; ++nUndoLoop)
actionList.AddTail(new CPreAction(ACTION_MODIFYNODE, pRegion->m_Selections[nUndoLoop]));
m_pView->GetRegionDoc()->Modify(&actionList, TRUE);
// If we're in geometry mode..
if (m_pView->GetEditMode() == GEOMETRY_EDITMODE)
{
// Get the selected vertices
CVertRefArray vertList;
m_pView->GetSelectedVerts(vertList);
// Rotate 'em
for (uint32 nVertLoop = 0; nVertLoop < vertList.GetSize(); ++nVertLoop)
{
CVertRef vert = vertList[nVertLoop];
if (!vert.IsValid())
continue;
vert() -= vOrigin;
mRotation.Apply(vert());
vert() += vOrigin;
}
}
else
{
// Otherwise, rotate all the selected nodes
for (uint32 nNodeLoop = 0; nNodeLoop < pRegion->m_Selections.GetSize( ); ++nNodeLoop)
{
pRegion->m_Selections[nNodeLoop]->Rotate(mRotation, vOrigin);
}
// Update the selection box since stuff rotated...
m_pView->GetRegionDoc()->UpdateSelectionBox();
}
return TRUE;
}
