TexturedButtonWidget
VTKExamples/Cxx/Widgets/TexturedButtonWidget
Description¶
This example creates a textured 2D button. The button is placed in the upper right of the display.
Question
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Code¶
TexturedButtonWidget.cxx
#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); image->AllocateScalars(VTK_UNSIGNED_CHAR, 3); 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 3.3 FATAL_ERROR) project(TexturedButtonWidget) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersSources vtkInteractionStyle vtkInteractionWidgets vtkRenderingCore vtkRenderingFreeType vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping TexturedButtonWidget: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(TexturedButtonWidget MACOSX_BUNDLE TexturedButtonWidget.cxx ) target_link_libraries(TexturedButtonWidget PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(TexturedButtonWidget MACOSX_BUNDLE TexturedButtonWidget.cxx ) target_link_libraries(TexturedButtonWidget PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS TexturedButtonWidget MODULES ${VTK_LIBRARIES} ) endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.