RenderWindowNoUiFile

Description¶

This is a very basic example that shows how to create a Qt window. Typically, one would want to design a form in the QtDesigner (this is shown in RenderWindowUISingleInheritance).

Question

If you have a question about this example, please use the VTK Discourse Forum

Code¶

RenderWindowNoUiFile.cxx

#include <QApplication>

#include <vtkActor.h>
#include <vtkGenericOpenGLRenderWindow.h>
#include <vtkLookupTable.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPlatonicSolidSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkVersion.h>

#if VTK_VERSION_NUMBER >= 89000000000ULL
#define VTK890 1
#endif

#include <QSurfaceFormat>
#include <QVTKOpenGLNativeWidget.h>

namespace {
/** Get a specialised lookup table for the platonic solids.
 *
 * Since each face of a vtkPlatonicSolidSource has a different
 * cell scalar, we create a lookup table with a different colour
 * for each face.
 * The colors have been carefully chosen so that adjacent cells
 * are colored distinctly.
 *
 * @return The lookup table.
 */
vtkNew<vtkLookupTable> GetPlatonicLUT();
} // namespace

int main(int argc, char* argv[])
{
  // Needed to ensure appropriate OpenGL context is created for VTK rendering.
  QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::defaultFormat());

  QApplication app(argc, argv);

  QVTKOpenGLNativeWidget widget;

  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;
#if VTK890
  widget.setRenderWindow(renderWindow);
#else
  widget.SetRenderWindow(renderWindow);
#endif

  widget.resize(600, 600);

  auto lut = GetPlatonicLUT();

  vtkNew<vtkPlatonicSolidSource> source;
  source->SetSolidTypeToIcosahedron();

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(source->GetOutputPort());
  mapper->SetLookupTable(lut);
  mapper->SetScalarRange(0, 19);

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);

  vtkNew<vtkRenderer> renderer;
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());

#if VTK890
  widget.renderWindow()->AddRenderer(renderer);
  widget.renderWindow()->SetWindowName("RenderWindowNoUIFile");
#else
  widget.GetRenderWindow()->AddRenderer(renderer);
  widget.GetRenderWindow()->SetWindowName("RenderWindowNoUIFile");
#endif
  widget.show();

  app.exec();

  return EXIT_SUCCESS;
}

namespace {

vtkNew<vtkLookupTable> GetPlatonicLUT()
{
  vtkNew<vtkLookupTable> lut;
  lut->SetNumberOfTableValues(20);
  lut->SetTableRange(0.0, 19.0);
  lut->Build();
  lut->SetTableValue(0, 0.1, 0.1, 0.1);
  lut->SetTableValue(1, 0, 0, 1);
  lut->SetTableValue(2, 0, 1, 0);
  lut->SetTableValue(3, 0, 1, 1);
  lut->SetTableValue(4, 1, 0, 0);
  lut->SetTableValue(5, 1, 0, 1);
  lut->SetTableValue(6, 1, 1, 0);
  lut->SetTableValue(7, 0.9, 0.7, 0.9);
  lut->SetTableValue(8, 0.5, 0.5, 0.5);
  lut->SetTableValue(9, 0.0, 0.0, 0.7);
  lut->SetTableValue(10, 0.5, 0.7, 0.5);
  lut->SetTableValue(11, 0, 0.7, 0.7);
  lut->SetTableValue(12, 0.7, 0, 0);
  lut->SetTableValue(13, 0.7, 0, 0.7);
  lut->SetTableValue(14, 0.7, 0.7, 0);
  lut->SetTableValue(15, 0, 0, 0.4);
  lut->SetTableValue(16, 0, 0.4, 0);
  lut->SetTableValue(17, 0, 0.4, 0.4);
  lut->SetTableValue(18, 0.4, 0, 0);
  lut->SetTableValue(19, 0.4, 0, 0.4);
  return lut;
}

} // namespace

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RenderWindowNoUiFile)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  FiltersSources
  GUISupportQt
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RenderWindowNoUiFile: 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(RenderWindowNoUiFile MACOSX_BUNDLE RenderWindowNoUiFile.cxx )
  target_link_libraries(RenderWindowNoUiFile PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS RenderWindowNoUiFile
  MODULES ${VTK_LIBRARIES}
)

Download and Build RenderWindowNoUiFile¶

Click here to download RenderWindowNoUiFile and its CMakeLists.txt file. Once the tarball RenderWindowNoUiFile.tar has been downloaded and extracted,

cd RenderWindowNoUiFile/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:

./RenderWindowNoUiFile

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.