PolyLine
VTKExamples/Cxx/GeometricObjects/PolyLine
Description¶
This example demonstrates how to make a line through several ordered points.
Code¶
PolyLine.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkCellArray.h> #include <vtkCellData.h> #include <vtkDoubleArray.h> #include <vtkPoints.h> #include <vtkPolyLine.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> int main(int, char *[]) { // Create five points. double origin[3] = {0.0, 0.0, 0.0}; double p0[3] = {1.0, 0.0, 0.0}; double p1[3] = {0.0, 1.0, 0.0}; double p2[3] = {0.0, 1.0, 2.0}; double p3[3] = {1.0, 2.0, 3.0}; // Create a vtkPoints object and store the points in it vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(origin); points->InsertNextPoint(p0); points->InsertNextPoint(p1); points->InsertNextPoint(p2); points->InsertNextPoint(p3); vtkSmartPointer<vtkPolyLine> polyLine = vtkSmartPointer<vtkPolyLine>::New(); polyLine->GetPointIds()->SetNumberOfIds(5); for(unsigned int i = 0; i < 5; i++) { polyLine->GetPointIds()->SetId(i,i); } // Create a cell array to store the lines in and add the lines to it vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New(); cells->InsertNextCell(polyLine); // Create a polydata to store everything in vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New(); // Add the points to the dataset polyData->SetPoints(points); // Add the lines to the dataset polyData->SetLines(cells); // Setup actor and mapper vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 mapper->SetInput(polyData); #else mapper->SetInputData(polyData); #endif vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Setup render window, renderer, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderer->AddActor(actor); renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(PolyLine) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(PolyLine MACOSX_BUNDLE PolyLine.cxx) target_link_libraries(PolyLine ${VTK_LIBRARIES})
Download and Build PolyLine¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download PolyLine and its CMakeLists.txt file. Once the tarball PolyLine.tar has been downloaded and extracted,
cd PolyLine/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./PolyLine
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.