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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTriangleStrip.cxx
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 "vtkTriangleStrip.h"
#include "vtkCellArray.h"
#include "vtkDoubleArray.h"
#include "vtkLine.h"
#include "vtkObjectFactory.h"
#include "vtkTriangle.h"
#include "vtkPoints.h"
#include "vtkIncrementalPointLocator.h"
vtkStandardNewMacro(vtkTriangleStrip);
//----------------------------------------------------------------------------
vtkTriangleStrip::vtkTriangleStrip()
{
this->Line = vtkLine::New();
this->Triangle = vtkTriangle::New();
}
//----------------------------------------------------------------------------
vtkTriangleStrip::~vtkTriangleStrip()
{
this->Line->Delete();
this->Triangle->Delete();
}
//----------------------------------------------------------------------------
int vtkTriangleStrip::EvaluatePosition(double x[3], double* closestPoint,
int& subId, double pcoords[3],
double& minDist2, double *weights)
{
double pc[3], dist2;
int ignoreId, i, return_status, status;
double tempWeights[3], activeWeights[3];
double closest[3];
pcoords[2] = 0.0;
activeWeights[0] = 0.0;
activeWeights[1] = 0.0;
activeWeights[2] = 0.0;
return_status = 0;
for (minDist2=VTK_DOUBLE_MAX,i=0; i<this->Points->GetNumberOfPoints()-2; i++)
{
weights[i] = 0.0;
this->Triangle->Points->SetPoint(0,this->Points->GetPoint(i));
this->Triangle->Points->SetPoint(1,this->Points->GetPoint(i+1));
this->Triangle->Points->SetPoint(2,this->Points->GetPoint(i+2));
status = this->Triangle->EvaluatePosition(x,closest,ignoreId,pc,dist2,tempWeights);
if ( status != -1 && dist2 < minDist2 )
{
return_status = status;
if (closestPoint)
{
closestPoint[0] = closest[0];
closestPoint[1] = closest[1];
closestPoint[2] = closest[2];
}
subId = i;
pcoords[0] = pc[0];
pcoords[1] = pc[1];
pcoords[2] = 1.0 - pc[0] - pc[1];
minDist2 = dist2;
activeWeights[0] = tempWeights[0];
activeWeights[1] = tempWeights[1];
activeWeights[2] = tempWeights[2];
}
}
weights[i] = 0.0;
weights[i+1] = 0.0;
weights[subId] = activeWeights[0];
weights[subId+1] = activeWeights[1];
weights[subId+2] = activeWeights[2];
return return_status;
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::EvaluateLocation(int& subId, double pcoords[3],
double x[3], double *weights)
{
int i;
static int idx[2][3]={{0,1,2},{1,0,2}};
int order = subId % 2;
double pt1[3], pt2[3], pt3[3];
this->Points->GetPoint(subId+idx[order][0], pt1);
this->Points->GetPoint(subId+idx[order][1], pt2);
this->Points->GetPoint(subId+idx[order][2], pt3);
double u3 = 1.0 - pcoords[0] - pcoords[1];
weights[0] = u3;
weights[1] = pcoords[0];
weights[2] = pcoords[1];
for (i=0; i<3; i++)
{
x[i] = pt1[i]*weights[0] + pt2[i]*weights[1] + pt3[i]*weights[2];
}
}
//----------------------------------------------------------------------------
int vtkTriangleStrip::CellBoundary(int subId, double pcoords[3], vtkIdList *pts)
{
static int idx[2][3]={{0,1,2},{1,0,2}};
int order;
order = subId % 2;
this->Triangle->PointIds->SetId(0,this->PointIds->GetId(subId + idx[order][0]));
this->Triangle->PointIds->SetId(1,this->PointIds->GetId(subId + idx[order][1]));
this->Triangle->PointIds->SetId(2,this->PointIds->GetId(subId + idx[order][2]));
return this->Triangle->CellBoundary(0, pcoords, pts);
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::Contour(double value, vtkDataArray *cellScalars,
vtkIncrementalPointLocator *locator, vtkCellArray *verts,
vtkCellArray *lines, vtkCellArray *polys,
vtkPointData *inPd, vtkPointData *outPd,
vtkCellData *inCd, vtkIdType cellId,
vtkCellData *outCd)
{
int i, numTris=this->Points->GetNumberOfPoints()-2;
vtkDataArray *triScalars=cellScalars->NewInstance();
triScalars->SetNumberOfComponents(cellScalars->GetNumberOfComponents());
triScalars->SetNumberOfTuples(3);
for ( i=0; i < numTris; i++)
{
this->Triangle->Points->SetPoint(0,this->Points->GetPoint(i));
this->Triangle->Points->SetPoint(1,this->Points->GetPoint(i+1));
this->Triangle->Points->SetPoint(2,this->Points->GetPoint(i+2));
if ( outPd )
{
this->Triangle->PointIds->SetId(0,this->PointIds->GetId(i));
this->Triangle->PointIds->SetId(1,this->PointIds->GetId(i+1));
this->Triangle->PointIds->SetId(2,this->PointIds->GetId(i+2));
}
triScalars->SetTuple(0,cellScalars->GetTuple(i));
triScalars->SetTuple(1,cellScalars->GetTuple(i+1));
triScalars->SetTuple(2,cellScalars->GetTuple(i+2));
this->Triangle->Contour(value, triScalars, locator, verts,
lines, polys, inPd, outPd, inCd, cellId, outCd);
}
triScalars->Delete();
}
//----------------------------------------------------------------------------
vtkCell *vtkTriangleStrip::GetEdge(int edgeId)
{
int id1, id2;
if ( edgeId == 0 )
{
id1 = 0;
id2 = 1;
}
else if ( edgeId == (this->GetNumberOfPoints()-1) )
{
id1 = edgeId - 1;
id2 = edgeId;
}
else
{
id1 = edgeId - 1;
id2 = edgeId + 1;
}
this->Line->PointIds->SetId(0,this->PointIds->GetId(id1));
this->Line->PointIds->SetId(1,this->PointIds->GetId(id2));
this->Line->Points->SetPoint(0,this->Points->GetPoint(id1));
this->Line->Points->SetPoint(1,this->Points->GetPoint(id2));
return this->Line;
}
//----------------------------------------------------------------------------
//
// Intersect sub-triangles
//
int vtkTriangleStrip::IntersectWithLine(double p1[3], double p2[3], double tol,
double& t, double x[3], double pcoords[3],
int& subId)
{
int subTest, numTris=this->Points->GetNumberOfPoints()-2;
for (subId=0; subId < numTris; subId++)
{
this->Triangle->Points->SetPoint(0,this->Points->GetPoint(subId));
this->Triangle->Points->SetPoint(1,this->Points->GetPoint(subId+1));
this->Triangle->Points->SetPoint(2,this->Points->GetPoint(subId+2));
if (this->Triangle->IntersectWithLine(p1, p2, tol, t, x, pcoords, subTest) )
{
return 1;
}
}
return 0;
}
//----------------------------------------------------------------------------
int vtkTriangleStrip::Triangulate(int vtkNotUsed(index), vtkIdList *ptIds,
vtkPoints *pts)
{
int numTris = this->Points->GetNumberOfPoints()-2;
int i, order;
static int idx[2][3]={{0,1,2},{1,0,2}};
pts->Reset();
ptIds->Reset();
for (int subId=0; subId < numTris; subId++)
{
order = subId % 2;
for ( i=0; i < 3; i++ )
{
ptIds->InsertNextId(this->PointIds->GetId(subId+idx[order][i]));
pts->InsertNextPoint(this->Points->GetPoint(subId+idx[order][i]));
}
}
return 1;
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::Derivatives(int subId, double pcoords[3], double *values,
int dim, double *derivs)
{
this->Triangle->Points->SetPoint(0,this->Points->GetPoint(subId));
this->Triangle->Points->SetPoint(1,this->Points->GetPoint(subId+1));
this->Triangle->Points->SetPoint(2,this->Points->GetPoint(subId+2));
this->Triangle->Derivatives(0, pcoords, values+dim*subId, dim, derivs);
}
//----------------------------------------------------------------------------
// Given a triangle strip, decompose it into (triangle) polygons. The
// polygons are appended to the end of the list of polygons.
void vtkTriangleStrip::DecomposeStrip(int npts, vtkIdType *pts,
vtkCellArray *polys)
{
int p1, p2, p3, i;
p1 = pts[0];
p2 = pts[1];
for (i=0; i<(npts-2); i++)
{
p3 = pts[i+2];
polys->InsertNextCell(3);
if ( (i % 2) ) // flip ordering to preserve consistency
{
polys->InsertCellPoint(p2);
polys->InsertCellPoint(p1);
polys->InsertCellPoint(p3);
}
else
{
polys->InsertCellPoint(p1);
polys->InsertCellPoint(p2);
polys->InsertCellPoint(p3);
}
p1 = p2;
p2 = p3;
}
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::Clip(double value, vtkDataArray *cellScalars,
vtkIncrementalPointLocator *locator, vtkCellArray *tris,
vtkPointData *inPd, vtkPointData *outPd,
vtkCellData *inCd, vtkIdType cellId,
vtkCellData *outCd, int insideOut)
{
int i, numTris=this->Points->GetNumberOfPoints()-2;
int id1, id2, id3;
vtkDataArray *triScalars=cellScalars->NewInstance();
triScalars->SetNumberOfComponents(cellScalars->GetNumberOfComponents());
triScalars->SetNumberOfTuples(3);
for ( i=0; i < numTris; i++)
{
if (i % 2)
{
id1 = i + 2; id2 = i + 1; id3 = i;
}
else
{
id1 = i; id2 = i + 1; id3 = i + 2;
}
this->Triangle->Points->SetPoint(0,this->Points->GetPoint(id1));
this->Triangle->Points->SetPoint(1,this->Points->GetPoint(id2));
this->Triangle->Points->SetPoint(2,this->Points->GetPoint(id3));
this->Triangle->PointIds->SetId(0,this->PointIds->GetId(id1));
this->Triangle->PointIds->SetId(1,this->PointIds->GetId(id2));
this->Triangle->PointIds->SetId(2,this->PointIds->GetId(id3));
triScalars->SetTuple(0,cellScalars->GetTuple(id1));
triScalars->SetTuple(1,cellScalars->GetTuple(id2));
triScalars->SetTuple(2,cellScalars->GetTuple(id3));
this->Triangle->Clip(value, triScalars, locator, tris, inPd, outPd,
inCd, cellId, outCd, insideOut);
}
triScalars->Delete();
}
//----------------------------------------------------------------------------
// Return the center of the point cloud in parametric coordinates.
int vtkTriangleStrip::GetParametricCenter(double pcoords[3])
{
pcoords[0] = pcoords[1] = 0.333333; pcoords[2] = 0.0;
return ((this->Points->GetNumberOfPoints()-2) / 2);
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::InterpolateFunctions(double pcoords[3], double *weights)
{
(void)pcoords;
(void)weights;
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::InterpolateDerivs(double pcoords[3], double *derivs)
{
(void)pcoords;
(void)derivs;
}
//----------------------------------------------------------------------------
void vtkTriangleStrip::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Line:\n";
this->Line->PrintSelf(os,indent.GetNextIndent());
os << indent << "Triangle:\n";
this->Triangle->PrintSelf(os,indent.GetNextIndent());
}