GraphAlgorithmSource
Repository source: GraphAlgorithmSource
Description¶
This example produces a vtkGraph as output.
You will need the following in your CMakeLists.txt file:
find_package(VTK
COMPONENTS
CommonCore
CommonDataModel
CommonExecutionModel
FiltersSources
InfovisCore
)
Question
If you have a question about this example, please use the VTK Discourse Forum
Code¶
GraphAlgorithmSource.cxx
#include <vtkGraph.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkNew.h>
#include "vtkTestGraphAlgorithmSource.h"
int main(int, char*[])
{
vtkNew<vtkTestGraphAlgorithmSource> source;
source->Update();
vtkGraph* outputGraph = source->GetOutput();
std::cout << "Output number of vertices: "
<< outputGraph->GetNumberOfVertices() << std::endl;
return EXIT_SUCCESS;
}
vtkTestGraphAlgorithmSource.h
#ifndef __vtkTestGraphAlgorithmSource_h
#define __vtkTestGraphAlgorithmSource_h
#include <vtkGraphAlgorithm.h>
class vtkTestGraphAlgorithmSource : public vtkGraphAlgorithm
{
public:
static vtkTestGraphAlgorithmSource* New();
vtkTypeMacro(vtkTestGraphAlgorithmSource, vtkGraphAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) override;
protected:
vtkTestGraphAlgorithmSource();
~vtkTestGraphAlgorithmSource();
int RequestData(vtkInformation*, vtkInformationVector**,
vtkInformationVector*) override;
int RequestDataObject(vtkInformation*, vtkInformationVector**,
vtkInformationVector*) override;
private:
vtkTestGraphAlgorithmSource(
const vtkTestGraphAlgorithmSource&); // Not implemented.
void operator=(const vtkTestGraphAlgorithmSource&); // Not implemented.
};
#endif
vtkTestGraphAlgorithmSource.cxx
#include "vtkTestGraphAlgorithmSource.h"
#include <vtkDataObject.h>
#include <vtkGraph.h>
#include <vtkInformation.h>
#include <vtkInformationVector.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkStreamingDemandDrivenPipeline.h>
#include <vtkUndirectedGraph.h>
vtkStandardNewMacro(vtkTestGraphAlgorithmSource);
vtkTestGraphAlgorithmSource::vtkTestGraphAlgorithmSource()
{
this->SetNumberOfInputPorts(0);
this->SetNumberOfOutputPorts(1);
}
vtkTestGraphAlgorithmSource::~vtkTestGraphAlgorithmSource()
{
}
int vtkTestGraphAlgorithmSource::RequestData(
vtkInformation* vtkNotUsed(request),
vtkInformationVector** vtkNotUsed(inputVector),
vtkInformationVector* outputVector)
{
vtkInformation* outInfo = outputVector->GetInformationObject(0);
vtkGraph* output =
dynamic_cast<vtkGraph*>(outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkNew<vtkMutableUndirectedGraph> NewGraph;
// add 3 vertices
NewGraph->AddVertex();
NewGraph->AddVertex();
NewGraph->AddVertex();
output->ShallowCopy(NewGraph);
return 1;
}
int vtkTestGraphAlgorithmSource::RequestDataObject(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*)
{
vtkNew<vtkUndirectedGraph> output;
this->GetExecutive()->SetOutputData(0, output);
return 1;
}
//----------------------------------------------------------------------------
void vtkTestGraphAlgorithmSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(GraphAlgorithmSource)
find_package(VTK COMPONENTS
CommonCore
CommonDataModel
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "GraphAlgorithmSource: 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(GraphAlgorithmSource MACOSX_BUNDLE GraphAlgorithmSource.cxx )
target_link_libraries(GraphAlgorithmSource PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS GraphAlgorithmSource
MODULES ${VTK_LIBRARIES}
)
Download and Build GraphAlgorithmSource¶
Click here to download GraphAlgorithmSource and its CMakeLists.txt file. Once the tarball GraphAlgorithmSource.tar has been downloaded and extracted,
cd GraphAlgorithmSource/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:
./GraphAlgorithmSource
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.