Line

VTKExamples/Cxx/GeometricObjects/Line


Description

The line is a primary one-dimensional cell. It is defined by two points. The direction along the line is from the first point to the second point.

Other Languages

See (Python), (Java), (CSharp)

Code

Line.cxx

#include <vtkActor.h>
#include <vtkLineSource.h>
#include <vtkNamedColors.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>

int main(int, char *[])
{
  // Create two points, P0 and P1
  double p0[3] = {1.0, 0.0, 0.0};
  double p1[3] = {0.0, 1.0, 0.0};

  vtkSmartPointer<vtkLineSource> lineSource = 
    vtkSmartPointer<vtkLineSource>::New();
  lineSource->SetPoint1(p0);
  lineSource->SetPoint2(p1);

  // Visualize
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(lineSource->GetOutputPort());
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetLineWidth(4);
  actor->GetProperty()->SetColor(colors->GetColor3d("Peacock").GetData());

  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("Line");
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->SetBackground(colors->GetColor3d("Silver").GetData());                                 
  renderer->AddActor(actor);

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Line)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Line: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(Line MACOSX_BUNDLE Line.cxx )
  target_link_libraries(Line PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Line MACOSX_BUNDLE Line.cxx )
  target_link_libraries(Line PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Line
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build Line

Click here to download Line and its CMakeLists.txt file. Once the tarball Line.tar has been downloaded and extracted,

cd Line/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:

./Line

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.