ImageTransparency
VTKExamples/Cxx/Visualization/ImageTransparency
Description
:''See also: [and [../../Images/ImageStencil]''
Code
ImageTransparency.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkLookupTable.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageMapToColors.h>
#include <vtkJPEGReader.h>
#include <vtkPointData.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
static void CreateImage(vtkSmartPointer<vtkImageData> image);
int main(int, char*[])
{
vtkSmartPointer<vtkImageData> image =
vtkSmartPointer<vtkImageData>::New();
CreateImage(image);
// Create actor
vtkSmartPointer<vtkImageActor> imageActor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
imageActor->SetInput(image);
#else
imageActor->GetMapper()->SetInputData(image);
#endif
// Visualize
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(imageActor);
renderer->ResetCamera();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
vtkSmartPointer<vtkInteractorStyleImage> style =
vtkSmartPointer<vtkInteractorStyleImage>::New();
renderWindowInteractor->SetInteractorStyle(style);
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->Initialize();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
void CreateImage(vtkSmartPointer<vtkImageData> image)
{
// Specify the size of the image data
image->SetDimensions(10,10,1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(4);
image->SetScalarTypeToUnsignedChar();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR,4);
#endif
int* dims = image->GetDimensions();
// int dims[3]; // can't do this
std::cout << "Dims: " << " x: " << dims[0] << " y: " << dims[1] << " z: " << dims[2] << std::endl;
// Fill every entry of the image with "2"
for (int y = 0; y < dims[1]; y++)
{
for (int x = 0; x < dims[0]; x++)
{
unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
pixel[0] = 255;
pixel[1] = 255;
pixel[2] = 255;
if(x<5)
{
pixel[3] = 0;
}
else
{
pixel[3] = 255;
}
}
}
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageTransparency)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageTransparency MACOSX_BUNDLE ImageTransparency.cxx)
target_link_libraries(ImageTransparency ${VTK_LIBRARIES})
Download and Build ImageTransparency
Click here to download ImageTransparency and its CMakeLists.txt file. Once the tarball ImageTransparency.tar has been downloaded and extracted,
cd ImageTransparency/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:
./ImageTransparency
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.