bool TrackballTransformManipulator::rotate()
{
if ( ( getCurrentX() != getLastX() ) || ( getCurrentY() != getLastY() ) )
{
DP_ASSERT( getViewState()->getCamera().isPtrTo<FrustumCamera>() );
TransformSharedPtr transform = m_transformPath->getTail().staticCast<Transform>();
FrustumCameraSharedPtr const& camera = getViewState()->getCamera().staticCast<FrustumCamera>();
if ( camera && transform )
{
unsigned int rtWidth = getRenderTarget()->getWidth();
unsigned int rtHeight = getRenderTarget()->getHeight();
Vec2f camWinSize = camera->getWindowSize();
if ( ( 0 < rtHeight ) && ( 0 < rtWidth )
&& ( FLT_EPSILON < fabs( camWinSize[0] ) )
&& ( FLT_EPSILON < fabs( camWinSize[1] ) ) )
{
// get all the matrices needed here
Mat44f m2w, w2m, w2v, v2w, v2s, m2v;
m_transformPath->getModelToWorldMatrix( m2w, w2m ); // model->world and world->model
w2v = camera->getWorldToViewMatrix(); // world->view
v2w = camera->getViewToWorldMatrix(); // view->world
v2s = camera->getProjection(); // view->screen (normalized)
m2v = m2w * w2v;
const Sphere3f& bs = transform->getBoundingSphere();
// center of the object in view coordinates
Vec4f centerV = Vec4f( bs.getCenter(), 1.0f ) * m2v;
DP_ASSERT( fabs( centerV[3] - 1.0f ) < FLT_EPSILON );
// center of the object in normalized screen coordinates
Vec4f centerNS = centerV * v2s;
DP_ASSERT( centerNS[3] != 0.0f );
centerNS /= centerNS[3];
// center of the object in screen space
Vec2f centerS( rtWidth * ( 1 + centerNS[0] ) / 2, rtHeight * ( 1 - centerNS[1] ) / 2 );
// move the input points relative to the center
// move the input points absolutely
//Vec2f last( m_orbitCursor );
Vec2f last( getLastCursorPosition() );
Vec2f p0( last[0] - centerS[0], centerS[1] - last[1] );
Vec2f p1( getCurrentX() - centerS[0], centerS[1] - getCurrentY() );
DP_ASSERT( p0[0] != p1[0] || p0[1] != p1[1] );
// get the scaling (from model to view)
Vec3f scaling, translation;
Quatf orientation, scaleOrientation;
decompose( m2v, translation, orientation, scaling, scaleOrientation );
float maxScale = std::max( scaling[0], std::max( scaling[1], scaling[2] ) );
DP_ASSERT( FLT_EPSILON < fabs( maxScale ) );
// determine the radius in screen space (in the centers depth)
Vec2f centerWindowSize = - centerV[2] / getViewState()->getTargetDistance() * camWinSize;
float radius = bs.getRadius() * maxScale * rtWidth / centerWindowSize[0];
// with p0, p1, and the radius determine the axis and angle of rotation via the Trackball utility
// => axis is in view space then
Vec3f axis;
float angle;
m_trackball.setSize( radius );
m_trackball.apply( p0, p1, axis, angle );
float dx = p1[0]-p0[0];
float dy = p1[1]-p0[1];
checkLockAxis(dx, dy);
if ( m_activeLockAxis[static_cast<size_t>(Axis::X)] )
{
if ( dx < 0 )
axis = Vec3f(0.f, -1.f, 0.f);
else if ( dx > 0)
axis = Vec3f(0.f, 1.f, 0.f);
else
return false;
}
else if ( m_activeLockAxis[static_cast<size_t>(Axis::Y)] )
{
if ( dy < 0 )
axis = Vec3f(1.f, 0.f, 0.f);
else if ( dy > 0)
axis = Vec3f(-1.f, 0.f, 0.f);
else
return false;
}
// transform axis back into model space
axis = Vec3f( Vec4f( axis, 0.0f ) * v2w * w2m );
axis.normalize();
// create the rotation around the center (in model space)
Trafo trafo;
trafo.setCenter( bs.getCenter() );
trafo.setOrientation( Quatf( axis, angle ) );
// concatenate this rotation with the current transformation
trafo.setMatrix( transform->getTrafo().getMatrix() * trafo.getMatrix() );
// concatenate this rotation with the original transformation
//trafo.setMatrix( m_matrix * trafo.getMatrix() );
// set the current transform
transform->setTrafo( trafo );
return true;
}
}
}
return false;
}
bool TrackballTransformManipulator::pan()
{
int dxScreen = getCurrentX() - getLastX();
int dyScreen = getLastY() - getCurrentY();
if ( dxScreen || dyScreen )
{
DP_ASSERT( getViewState()->getCamera().isPtrTo<FrustumCamera>() );
TransformSharedPtr transform = m_transformPath->getTail().staticCast<Transform>();
FrustumCameraSharedPtr const& camera = getViewState()->getCamera().staticCast<FrustumCamera>();
if ( camera && transform )
{
unsigned int rtWidth = getRenderTarget()->getWidth();
unsigned int rtHeight = getRenderTarget()->getHeight();
Vec2f camWinSize = camera->getWindowSize();
if ( ( 0 < rtHeight ) && ( 0 < rtWidth )
&& ( FLT_EPSILON < fabs( camWinSize[0] ) )
&& ( FLT_EPSILON < fabs( camWinSize[1] ) ) )
{
// get all the matrices needed here
Mat44f m2w, w2m;
m_transformPath->getModelToWorldMatrix(m2w, w2m); // model->world and world->model
Mat44f w2v = camera->getWorldToViewMatrix(); // world->view
Mat44f v2w = camera->getViewToWorldMatrix(); // view->world
// center of the object in view coordinates
Vec4f center = Vec4f( transform->getBoundingSphere().getCenter(), 1.0f ) * m2w * w2v;
// window size at distance of the center of the object
Vec2f centerWindowSize = - center[2] / getViewState()->getTargetDistance() * camWinSize;
checkLockAxis(dxScreen, dyScreen);
if ( m_activeLockAxis[static_cast<size_t>(Axis::X)] )
{
if ( dxScreen != 0 )
{
dyScreen = 0;
}
else
{
return false;
}
}
else if ( m_activeLockAxis[static_cast<size_t>(Axis::Y)] )
{
if ( dyScreen != 0)
{
dxScreen = 0;
}
else
{
return false;
}
}
// delta in model coordinates
Vec4f viewCenter( centerWindowSize[0] * dxScreen / rtWidth
, centerWindowSize[1] * dyScreen / rtHeight, 0.f, 0.f );
Vec4f modelDelta = viewCenter * v2w * w2m;
// add the delta to the translation of the transform
Trafo trafo = transform->getTrafo();
trafo.setTranslation( trafo.getTranslation() + Vec3f( modelDelta ) );
transform->setTrafo( trafo );
return true;
}
}
}
return false;
}