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/*=========================================================================
Program: Visualization Toolkit
Module: TestPolygon.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.
=========================================================================*/
// .NAME
// .SECTION Description
// this program tests the BoundedTriangulate method in Polygon
#include "vtkIdList.h"
#include "vtkNew.h"
#include "vtkPoints.h"
#include "vtkPolygon.h"
// #define VISUAL_DEBUG 1
#ifdef VISUAL_DEBUG
#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#endif
#include <vector>
bool ValidTessellation(vtkPolygon* polygon, vtkIdList* outTris)
{
// Check that there are enough triangles
if (outTris->GetNumberOfIds() / 3 != polygon->GetNumberOfPoints() - 2)
{
return false;
}
// Check that all of the edges of the polygon are represented
std::vector<bool> edges(polygon->GetNumberOfPoints(), false);
for (int i = 0; i < polygon->GetNumberOfPoints(); i++)
{
vtkIdType edge[2] = { polygon->GetPointId(i),
polygon->GetPointId((i + 1) % polygon->GetNumberOfPoints()) };
for (int j = 0; j < outTris->GetNumberOfIds(); j += 3)
{
for (int k = 0; k < 3; k++)
{
vtkIdType triedge[2] = { polygon->PointIds->GetId(outTris->GetId(j + k)),
polygon->PointIds->GetId(outTris->GetId(j + ((k + 1) % 3))) };
if ((triedge[0] == edge[0] && triedge[1] == edge[1]) ||
(triedge[0] == edge[1] && triedge[1] == edge[0]))
{
edges[i] = true;
break;
}
}
if (edges[i])
break;
}
if (!edges[i])
break;
}
for (std::size_t i = 0; i < edges.size(); i++)
{
if (!edges[i])
{
return false;
}
}
return true;
}
int TestPolygonBoundedTriangulate(int, char*[])
{
vtkNew<vtkPolygon> polygon;
polygon->GetPoints()->InsertNextPoint(125.703, 149.84, 45.852);
polygon->GetPoints()->InsertNextPoint(126.438, 147.984, 44.3112);
polygon->GetPoints()->InsertNextPoint(126.219, 148.174, 44.4463);
polygon->GetPoints()->InsertNextPoint(126.196, 148.202, 44.4683);
polygon->GetPoints()->InsertNextPoint(126.042, 148.398, 44.6184);
polygon->GetPoints()->InsertNextPoint(125.854, 148.635, 44.8);
polygon->GetPoints()->InsertNextPoint(125.598, 148.958, 45.0485);
polygon->GetPoints()->InsertNextPoint(125.346, 149.24, 45.26);
polygon->GetPoints()->InsertNextPoint(125.124, 149.441, 45.4041);
polygon->GetPointIds()->SetNumberOfIds(polygon->GetPoints()->GetNumberOfPoints());
for (vtkIdType i = 0; i < polygon->GetPoints()->GetNumberOfPoints(); i++)
{
polygon->GetPointIds()->SetId(i, i);
}
vtkNew<vtkIdList> outTris;
int success = polygon->BoundedTriangulate(outTris, 1.e-2);
if (!success || !ValidTessellation(polygon, outTris))
{
cerr << "ERROR: vtkPolygon::BoundedTriangulate should triangulate this polygon" << endl;
return EXIT_FAILURE;
}
#ifdef VISUAL_DEBUG
vtkNew<vtkCellArray> triangles;
for (vtkIdType i = 0; i < outTris->GetNumberOfIds(); i += 3)
{
vtkIdType t[3] = { outTris->GetId(i), outTris->GetId(i + 1), outTris->GetId(i + 2) };
triangles->InsertNextCell(3, t);
}
vtkNew<vtkPolyData> polydata;
polydata->SetPoints(polygon->GetPoints());
polydata->SetPolys(triangles);
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputData(polydata);
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetRepresentationToWireframe();
// Create a renderer, render window, and an interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor);
renderer->SetBackground(.1, .2, .4);
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
#endif
return EXIT_SUCCESS;
}
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