GeometricObjectsDemo
VTKExamples/Cxx/GeometricObjects/GeometricObjectsDemo
Code
GeometricObjectsDemo.cxx
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkTextMapper.h>
#include <vtkActor.h>
#include <vtkActor2D.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkArrowSource.h>
#include <vtkConeSource.h>
#include <vtkCubeSource.h>
#include <vtkCylinderSource.h>
#include <vtkDiskSource.h>
#include <vtkLineSource.h>
#include <vtkRegularPolygonSource.h>
#include <vtkSphereSource.h>
#include <vector>
int main(int, char *[])
{
// 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<vtkRenderer> > renderers;
std::vector<vtkSmartPointer<vtkPolyDataMapper> > mappers;
std::vector<vtkSmartPointer<vtkActor> > actors;
std::vector<vtkSmartPointer<vtkTextMapper> > textmappers;
std::vector<vtkSmartPointer<vtkActor2D> > textactors;
// 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] );
textmappers.push_back( vtkSmartPointer<vtkTextMapper>::New() );
textmappers[i]->SetInput( geometricObjectSources[i]->GetClassName() ); // set text label to the name of the object source
textactors.push_back( vtkSmartPointer<vtkActor2D>::New() );
textactors[i]->SetMapper( textmappers[i] );
textactors[i]->SetPosition( 10, 10); // 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 = 200;
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(rendererSize*gridCols, rendererSize*gridRows);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
// 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(.1, .2, .3);
// 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] = {
((col ) * rendererSize) / (gridCols * rendererSize),
((gridRows - (row + 1)) * rendererSize) / (gridRows * rendererSize),
((col + 1) * rendererSize) / (gridCols * rendererSize),
((gridRows - (row )) * rendererSize) / (gridRows * rendererSize) };
renderer->SetViewport(viewport);
// Add the corresponding actor and label for this grid cell, if they exist
if( index < geometricObjectSources.size() )
{
renderer->AddActor(actors[index]);
renderer->AddActor(textactors[index]);
}
renderWindow->AddRenderer(renderer);
}
}
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(GeometricObjectsDemo)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(GeometricObjectsDemo MACOSX_BUNDLE GeometricObjectsDemo.cxx)
target_link_libraries(GeometricObjectsDemo ${VTK_LIBRARIES})
Download and Build GeometricObjectsDemo
Click here to download GeometricObjectsDemo and its CMakeLists.txt file. Once the tarball GeometricObjectsDemo.tar has been downloaded and extracted,
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.