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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkCellPicker.cxx,v $
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkCellPicker.h"
#include "vtkGenericCell.h"
#include "vtkImageData.h"
#include "vtkMapper.h"
#include "vtkObjectFactory.h"
#include "vtkAbstractVolumeMapper.h"
vtkCxxRevisionMacro(vtkCellPicker, "$Revision: 1.36 $");
vtkStandardNewMacro(vtkCellPicker);
vtkCellPicker::vtkCellPicker()
{
this->CellId = -1;
this->SubId = -1;
for (int i=0; i<3; i++)
{
this->PCoords[i] = 0.0;
}
this->Cell = vtkGenericCell::New();
}
vtkCellPicker::~vtkCellPicker()
{
this->Cell->Delete();
}
double vtkCellPicker::IntersectWithLine(double p1[3], double p2[3], double tol,
vtkAssemblyPath *path,
vtkProp3D *prop3D,
vtkAbstractMapper3D *m)
{
vtkIdType numCells, cellId, minCellId;
int i, minSubId, subId;
double x[3], tMin, t, pcoords[3], minXYZ[3], minPcoords[3];
vtkDataSet *input;
vtkMapper *mapper;
vtkAbstractVolumeMapper *volumeMapper;
// Get the underlying dataset
if ( (mapper=vtkMapper::SafeDownCast(m)) != NULL )
{
input = mapper->GetInput();
}
else if ( (volumeMapper=vtkAbstractVolumeMapper::SafeDownCast(m)) != NULL )
{
input = volumeMapper->GetDataSetInput();
}
else
{
return VTK_DOUBLE_MAX;
}
if ( (numCells = input->GetNumberOfCells()) < 1 )
{
return 2.0;
}
// Intersect each cell with ray. Keep track of one closest to
// the eye (within the tolerance tol) and within the clipping range).
// Note that we fudge the "closest to" (tMin+this->Tolerance) a little and
// keep track of the cell with the best pick based on parametric
// coordinate (pick the minimum, maximum parametric distance). This
// breaks ties in a reasonable way when cells are the same distance
// from the eye (like cells lying on a 2D plane).
//
minCellId = -1;
minSubId = -1;
pcoords[0] = pcoords[1] = pcoords[2] = 0;
double pDistMin=VTK_DOUBLE_MAX, pDist;
for (tMin=VTK_DOUBLE_MAX,cellId=0; cellId<numCells; cellId++)
{
input->GetCell(cellId, this->Cell);
if ( this->Cell->IntersectWithLine(p1, p2, tol, t, x, pcoords, subId)
&& t <= (tMin+this->Tolerance) )
{
pDist = this->Cell->GetParametricDistance(pcoords);
if ( pDist < pDistMin || (pDist == pDistMin && t < tMin) )
{
minCellId = cellId;
minSubId = subId;
for (i=0; i<3; i++)
{
minXYZ[i] = x[i];
minPcoords[i] = pcoords[i];
}
tMin = t;
pDistMin = pDist;
}//if minimum, maximum
}//if a close cell
}//for all cells
// Now compare this against other actors.
//
if ( minCellId>(-1) && tMin < this->GlobalTMin )
{
this->MarkPicked(path, prop3D, m, tMin, minXYZ);
this->CellId = minCellId;
this->SubId = minSubId;
for (i=0; i<3; i++)
{
this->PCoords[i] = minPcoords[i];
}
vtkDebugMacro("Picked cell id= " << minCellId);
}
return tMin;
}
void vtkCellPicker::Initialize()
{
this->CellId = (-1);
this->SubId = (-1);
for (int i=0; i<3; i++)
{
this->PCoords[i] = 0.0;
}
this->vtkPicker::Initialize();
}
void vtkCellPicker::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Cell Id: " << this->CellId << "\n";
os << indent << "SubId: " << this->SubId << "\n";
os << indent << "PCoords: (" << this->PCoords[0] << ", "
<< this->PCoords[1] << ", " << this->PCoords[2] << ")\n";
}
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