# GeometricObjectsDemo

VTKExamples/Cxx/GeometricObjects/GeometricObjectsDemo

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### Code¶

GeometricObjectsDemo.cxx

#include <vtkActor.h>
#include <vtkActor2D.h>
#include <vtkArrowSource.h>
#include <vtkConeSource.h>
#include <vtkCubeSource.h>
#include <vtkCylinderSource.h>
#include <vtkDiskSource.h>
#include <vtkLineSource.h>
#include <vtkNamedColors.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRegularPolygonSource.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkTextMapper.h>
#include <vtkTextProperty.h>

#include <array>
#include <vector>
#include <vtkCamera.h>

int main(int, char *[])
{
vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();

// Set the background color.
std::array<unsigned char , 4> bkg{{51, 77, 102, 255}};
colors->SetColor("BkgColor", bkg.data());

// Create container to hold the 3D object generators (sources)
std::vector<vtkSmartPointer<vtkPolyDataAlgorithm> > geometricObjectSources;

// Populate the container with the various object sources to be demonstrated
geometricObjectSources.push_back( vtkSmartPointer<vtkArrowSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkConeSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkCubeSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkCylinderSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkDiskSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkLineSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkRegularPolygonSource>::New() );
geometricObjectSources.push_back( vtkSmartPointer<vtkSphereSource>::New() );

// Create containers for the remaining nodes of each pipeline
std::vector<vtkSmartPointer<vtkPolyDataMapper> > mappers;
std::vector<vtkSmartPointer<vtkActor> > actors;
std::vector<vtkSmartPointer<vtkTextMapper> > textmappers;
std::vector<vtkSmartPointer<vtkActor2D> > textactors;

// Create a common text property.
vtkSmartPointer<vtkTextProperty> textProperty =
vtkSmartPointer<vtkTextProperty>::New();
textProperty->SetFontSize(16);
textProperty->SetJustificationToCentered();

// Create a mapper and actor for each object and the corresponding text label
for( unsigned int i = 0; i < geometricObjectSources.size(); i++ )
{
geometricObjectSources[i]->Update();

mappers.push_back( vtkSmartPointer<vtkPolyDataMapper>::New() );
mappers[i]->SetInputConnection( geometricObjectSources[i]->GetOutputPort() );

actors.push_back( vtkSmartPointer<vtkActor>::New() );
actors[i]->SetMapper( mappers[i] );
actors[i]->GetProperty()->SetColor(
colors->GetColor3d("Seashell").GetData());

textmappers.push_back( vtkSmartPointer<vtkTextMapper>::New() );
textmappers[i]->SetInput( geometricObjectSources[i]->GetClassName() ); // set text label to the name of the object source
textmappers[i]->SetTextProperty(textProperty);

textactors.push_back( vtkSmartPointer<vtkActor2D>::New() );
textactors[i]->SetMapper( textmappers[i] );
textactors[i]->SetPosition( 120, 16); // Note: the position of an Actor2D is specified in display coordinates
}

// Define size of the grid that will hold the objects
int gridCols = 3;
int gridRows = 3;
// Define side length (in pixels) of each renderer square
int rendererSize = 300;

vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetWindowName("Geometric Objects Demo");
renderWindow->SetSize(rendererSize*gridCols, rendererSize*gridRows);

// Set up a grid of viewports for each renderer
for( double row = 0; row < gridRows; row++ )
{
for( double col = 0; col < gridCols; col++ )
{
double index = row*gridCols + col;

// Create a renderer for this grid cell
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderer->SetBackground(colors->GetColor3d("BkgColor").GetData());

// Set the renderer's viewport dimensions (xmin, ymin, xmax, ymax) within the render window.
// Note that for the Y values, we need to subtract the row index from gridRows
// because the viewport Y axis points upwards, but we want to draw the grid from top to down
double viewport[4] = {
static_cast<double>(col) / gridCols,
static_cast<double>(gridRows - row - 1) / gridRows,
static_cast<double>(col + 1) / gridCols,
static_cast<double>(gridRows - row) / gridRows };
renderer->SetViewport(viewport);

// Add the corresponding actor and label for this grid cell, if they exist
if( index < geometricObjectSources.size() )
{
renderer->ResetCameraClippingRange();
}

}
}

vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);

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

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(GeometricObjectsDemo)

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


cd GeometricObjectsDemo/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:

./GeometricObjectsDemo


WINDOWS USERS

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