// Zooms with a factor (1.0=identity) around the specified center, but tries (if its within view contraints) to match the center in display units with the center in world coordinates.
bool mitk::DisplayGeometry::ZoomWithFixedWorldCoordinates(ScalarType factor, const Point2D& focusDisplayUnits, const Point2D& focusUnitsInMM )
{
assert(factor > 0);
SetScaleFactor(m_ScaleFactorMMPerDisplayUnit/factor);
SetOriginInMM(focusUnitsInMM.GetVectorFromOrigin()-focusDisplayUnits.GetVectorFromOrigin()*m_ScaleFactorMMPerDisplayUnit);
return true;
}
// Zooms with a factor (1.0=identity) around the specified center in display units
bool mitk::DisplayGeometry::Zoom(ScalarType factor, const Point2D& centerInDisplayUnits)
{
assert(factor > 0);
if ( SetScaleFactor(m_ScaleFactorMMPerDisplayUnit/factor) )
{
return SetOriginInMM(m_OriginInMM-centerInDisplayUnits.GetVectorFromOrigin()*(1-factor)*m_ScaleFactorMMPerDisplayUnit);
}
else
{
return false;
}
}
void mitk::DisplayGeometry::SetSizeInDisplayUnits(unsigned int width, unsigned int height, bool keepDisplayedRegion)
{
Vector2D oldSizeInMM( m_SizeInMM );
Point2D oldCenterInMM;
if(keepDisplayedRegion)
{
Point2D centerInDisplayUnits;
centerInDisplayUnits[0] = m_SizeInDisplayUnits[0]*0.5;
centerInDisplayUnits[1] = m_SizeInDisplayUnits[1]*0.5;
DisplayToWorld(centerInDisplayUnits, oldCenterInMM);
}
m_SizeInDisplayUnits[0]=width;
m_SizeInDisplayUnits[1]=height;
if(m_SizeInDisplayUnits[0] <= 0)
m_SizeInDisplayUnits[0] = 1;
if(m_SizeInDisplayUnits[1] <= 0)
m_SizeInDisplayUnits[1] = 1;
DisplayToWorld(m_SizeInDisplayUnits, m_SizeInMM);
if(keepDisplayedRegion)
{
Point2D positionOfOldCenterInCurrentDisplayUnits;
WorldToDisplay(oldCenterInMM, positionOfOldCenterInCurrentDisplayUnits);
Point2D currentNewCenterInDisplayUnits;
currentNewCenterInDisplayUnits[0] = m_SizeInDisplayUnits[0]*0.5;
currentNewCenterInDisplayUnits[1] = m_SizeInDisplayUnits[1]*0.5;
Vector2D shift;
shift=positionOfOldCenterInCurrentDisplayUnits.GetVectorFromOrigin()-currentNewCenterInDisplayUnits;
MoveBy(shift);
Zoom(m_SizeInMM.GetNorm()/oldSizeInMM.GetNorm(), currentNewCenterInDisplayUnits);
}
Modified();
}
