TexturedButtonWidget
VTKExamples/Cxx/Widgets/TexturedButtonWidget
Description
This example creates a textured 2D button. The button is placed in the upper right of the display.
Code
TexturedButtonWidget.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkImageData.h>
#include <vtkCoordinate.h>
#include <vtkSphereSource.h>
#include <vtkButtonWidget.h>
#include <vtkTexturedButtonRepresentation2D.h>
static void CreateImage(vtkSmartPointer<vtkImageData> image,
unsigned char *color1,
unsigned char *color2);
int main(int, char *[])
{
// Create two images for texture
vtkSmartPointer<vtkImageData> image1 =
vtkSmartPointer<vtkImageData>::New();
vtkSmartPointer<vtkImageData> image2 =
vtkSmartPointer<vtkImageData>::New();
unsigned char banana[3] = { 227, 207, 87 };
unsigned char tomato[3] = { 255, 99, 71 };
CreateImage(image1, banana, tomato);
CreateImage(image2, tomato, banana);
// Create some geometry
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// A renderer and render window
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
// An interactor
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Create the widget and its representation
vtkSmartPointer<vtkTexturedButtonRepresentation2D> buttonRepresentation =
vtkSmartPointer<vtkTexturedButtonRepresentation2D>::New();
buttonRepresentation->SetNumberOfStates(2);
buttonRepresentation->SetButtonTexture(0, image1);
buttonRepresentation->SetButtonTexture(1, image2);
vtkSmartPointer<vtkButtonWidget> buttonWidget =
vtkSmartPointer<vtkButtonWidget>::New();
buttonWidget->SetInteractor(renderWindowInteractor);
buttonWidget->SetRepresentation(buttonRepresentation);
// Add the actors to the scene
renderer->AddActor(actor);
renderer->SetBackground(.1, .2, .5);
renderWindow->SetSize(640, 480);
renderWindow->Render();
// Place the widget. Must be done after a render so that the
// viewport is defined.
// Here the widget placement is in normalized display coordinates
vtkSmartPointer<vtkCoordinate> upperRight =
vtkSmartPointer<vtkCoordinate>::New();
upperRight->SetCoordinateSystemToNormalizedDisplay();
upperRight->SetValue(1.0, 1.0);
double bds[6];
double sz = 50.0;
bds[0] = upperRight->GetComputedDisplayValue(renderer)[0] - sz;
bds[1] = bds[0] + sz;
bds[2] = upperRight->GetComputedDisplayValue(renderer)[1] - sz;
bds[3] = bds[2] + sz;
bds[4] = bds[5] = 0.0;
// Scale to 1, default is .5
buttonRepresentation->SetPlaceFactor(1);
buttonRepresentation->PlaceWidget(bds);
buttonWidget->On();
// Begin mouse interaction
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
void CreateImage(vtkSmartPointer<vtkImageData> image,
unsigned char* color1,
unsigned char* color2)
{
// Specify the size of the image data
image->SetDimensions(10, 10, 1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(3);
image->SetScalarTypeToUnsignedChar();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR, 3);
#endif
int* dims = image->GetDimensions();
// Fill the image with
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));
if (x < 5)
{
pixel[0] = color1[0];
pixel[1] = color1[1];
pixel[2] = color1[2];
}
else
{
pixel[0] = color2[0];
pixel[1] = color2[1];
pixel[2] = color2[2];
}
}
}
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(TexturedButtonWidget)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(TexturedButtonWidget MACOSX_BUNDLE TexturedButtonWidget.cxx)
target_link_libraries(TexturedButtonWidget ${VTK_LIBRARIES})
Download and Build TexturedButtonWidget
Click here to download TexturedButtonWidget and its CMakeLists.txt file. Once the tarball TexturedButtonWidget.tar has been downloaded and extracted,
cd TexturedButtonWidget/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:
./TexturedButtonWidget
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.