ImageMapper
VTKExamples/Cxx/Visualization/ImageMapper
Description
This example demonstrates how to display an image in 2D. The size and position are in screen coordinates.
Code
ImageMapper.cxx
#include <vtkVersion.h>
#include <vtkImageData.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageMapper.h>
#include <vtkActor2D.h>
#include <vtkImageSlice.h>
static void CreateColorImage(vtkImageData*);
int main(int, char *[])
{
vtkSmartPointer<vtkImageData> colorImage = vtkSmartPointer<vtkImageData>::New();
CreateColorImage(colorImage);
vtkSmartPointer<vtkImageMapper> imageMapper = vtkSmartPointer<vtkImageMapper>::New();
#if VTK_MAJOR_VERSION <= 5
imageMapper->SetInputConnection(colorImage->GetProducerPort());
#else
imageMapper->SetInputData(colorImage);
#endif
imageMapper->SetColorWindow(255);
imageMapper->SetColorLevel(127.5);
vtkSmartPointer<vtkActor2D> imageActor = vtkSmartPointer<vtkActor2D>::New();
imageActor->SetMapper(imageMapper);
imageActor->SetPosition(20, 20);
// Setup renderers
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
// Setup render window
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
// Setup render window interactor
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New();
renderWindowInteractor->SetInteractorStyle(style);
// Render and start interaction
renderWindowInteractor->SetRenderWindow(renderWindow);
//renderer->AddViewProp(imageActor);
renderer->AddActor2D(imageActor);
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
void CreateColorImage(vtkImageData* image)
{
unsigned int dim = 20;
image->SetDimensions(dim, dim, 1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(3);
image->SetScalarTypeToUnsignedChar();
image->AllocateScalars();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR,3);
#endif
for(unsigned int x = 0; x < dim; x++)
{
for(unsigned int y = 0; y < dim; y++)
{
unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
if(x < dim/2)
{
pixel[0] = 255;
pixel[1] = 0;
}
else
{
pixel[0] = 0;
pixel[1] = 255;
}
pixel[2] = 0;
}
}
image->Modified();
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageMapper)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageMapper MACOSX_BUNDLE ImageMapper.cxx)
target_link_libraries(ImageMapper ${VTK_LIBRARIES})
Download and Build ImageMapper
Click here to download ImageMapper and its CMakeLists.txt file. Once the tarball ImageMapper.tar has been downloaded and extracted,
cd ImageMapper/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:
./ImageMapper
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.