# 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
)

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.