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Quad

vtk-examples/Cxx/GeometricObjects/Quad


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Question

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Code

Quad.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkQuad.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // Create four points (must be in counter clockwise order)
  double p0[3] = {0.0, 0.0, 0.0};
  double p1[3] = {1.0, 0.0, 0.0};
  double p2[3] = {1.0, 1.0, 0.0};
  double p3[3] = {0.0, 1.0, 0.0};

  // Add the points to a vtkPoints object
  vtkNew<vtkPoints> points;
  points->InsertNextPoint(p0);
  points->InsertNextPoint(p1);
  points->InsertNextPoint(p2);
  points->InsertNextPoint(p3);

  // Create a quad on the four points
  vtkNew<vtkQuad> quad;
  quad->GetPointIds()->SetId(0, 0);
  quad->GetPointIds()->SetId(1, 1);
  quad->GetPointIds()->SetId(2, 2);
  quad->GetPointIds()->SetId(3, 3);

  // Create a cell array to store the quad in
  vtkNew<vtkCellArray> quads;
  quads->InsertNextCell(quad);

  // Create a polydata to store everything in
  vtkNew<vtkPolyData> polydata;

  // Add the points and quads to the dataset
  polydata->SetPoints(points);
  polydata->SetPolys(quads);

  // Setup actor and mapper
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputData(polydata);

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Silver").GetData());

  // Setup render window, renderer, and interactor
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetWindowName("Quad");
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("Salmon").GetData());
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(Quad)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "Quad: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(Quad MACOSX_BUNDLE Quad.cxx )
  target_link_libraries(Quad PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS Quad
  MODULES ${VTK_LIBRARIES}
)

Download and Build Quad

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

cd Quad/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:

./Quad

WINDOWS USERS

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