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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkPointPicker.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 "vtkPointPicker.h"
#include "vtkImageData.h"
#include "vtkMath.h"
#include "vtkMapper.h"
#include "vtkAbstractVolumeMapper.h"
#include "vtkObjectFactory.h"
vtkCxxRevisionMacro(vtkPointPicker, "$Revision: 1.34 $");
vtkStandardNewMacro(vtkPointPicker);
vtkPointPicker::vtkPointPicker()
{
this->PointId = -1;
}
double vtkPointPicker::IntersectWithLine(double p1[3], double p2[3], double tol,
vtkAssemblyPath *path, vtkProp3D *p,
vtkAbstractMapper3D *m)
{
vtkIdType numPts;
vtkIdType ptId, minPtId;
int i;
double ray[3], rayFactor, tMin, x[3], t, projXYZ[3], minXYZ[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 2.0;
}
if ( (numPts = input->GetNumberOfPoints()) < 1 )
{
return 2.0;
}
// Determine appropriate info
//
for (i=0; i<3; i++)
{
ray[i] = p2[i] - p1[i];
}
if (( rayFactor = vtkMath::Dot(ray,ray)) == 0.0 )
{
vtkErrorMacro("Cannot process points");
return 2.0;
}
// Project each point onto ray. Keep track of the one within the
// tolerance and closest to the eye (and within the clipping range).
//
double dist, maxDist, minPtDist=VTK_DOUBLE_MAX;
for (minPtId=(-1),tMin=VTK_DOUBLE_MAX,ptId=0; ptId<numPts; ptId++)
{
input->GetPoint(ptId,x);
t = (ray[0]*(x[0]-p1[0]) + ray[1]*(x[1]-p1[1]) + ray[2]*(x[2]-p1[2]))
/ rayFactor;
// If we find a point closer than we currently have, see whether it
// lies within the pick tolerance and clipping planes. We keep track
// of the point closest to the line (use a fudge factor for points
// nearly the same distance away.)
//
if ( t >= 0.0 && t <= 1.0 && t <= (tMin+this->Tolerance) )
{
for(maxDist=0.0, i=0; i<3; i++)
{
projXYZ[i] = p1[i] + t*ray[i];
dist = fabs(x[i]-projXYZ[i]);
if ( dist > maxDist )
{
maxDist = dist;
}
}
if ( maxDist <= tol && maxDist < minPtDist ) // within tolerance
{
minPtId = ptId;
minXYZ[0]=x[0]; minXYZ[1]=x[1]; minXYZ[2]=x[2];
minPtDist = maxDist;
tMin = t;
}
}
}
// Now compare this against other actors.
//
if ( minPtId>(-1) && tMin < this->GlobalTMin )
{
this->MarkPicked(path, p, m, tMin, minXYZ);
this->PointId = minPtId;
vtkDebugMacro("Picked point id= " << minPtId);
}
return tMin;
}
void vtkPointPicker::Initialize()
{
this->PointId = (-1);
this->vtkPicker::Initialize();
}
void vtkPointPicker::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Point Id: " << this->PointId << "\n";
}
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