QtBarChart

VTKExamples/Cxx/Qt/QtBarChart


Code

QtBarChart.cxx

#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkSmartPointer.h>
#include <vtkChartXY.h>
#include <vtkPlot.h>
#include <vtkTable.h>
#include <vtkIntArray.h>
#include <vtkContextView.h>
#include <vtkContextScene.h>
#include <vtkRenderWindowInteractor.h>

#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()


// Monthly circulation data
static int data_2008[] = {10822, 10941, 9979, 10370, 9460, 11228, 15093, 12231, 10160, 9816, 9384, 7892};
static int data_2009[] = {9058, 9474, 9979, 9408, 8900, 11569, 14688, 12231, 10294, 9585, 8957, 8590};
static int data_2010[] = {9058, 10941, 9979, 10270, 8900, 11228, 14688, 12231, 10160, 9585, 9384, 8590};

int main(int, char*[] )
{
  // Set up a 2D scene, add an XY chart to it
  VTK_CREATE(vtkContextView, view);
  view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
  view->GetRenderWindow()->SetSize(400, 300);
  VTK_CREATE(vtkChartXY, chart);
  view->GetScene()->AddItem(chart);

  // Create a table with some points in it...
  VTK_CREATE(vtkTable, table);

  VTK_CREATE(vtkIntArray, arrMonth);
  arrMonth->SetName("Month");
  table->AddColumn(arrMonth);

  VTK_CREATE(vtkIntArray, arr2008);
  arr2008->SetName("2008");
  table->AddColumn(arr2008);

  VTK_CREATE(vtkIntArray, arr2009);
  arr2009->SetName("2009");
  table->AddColumn(arr2009);

  VTK_CREATE(vtkIntArray, arr2010);
  arr2010->SetName("2010");
  table->AddColumn(arr2010);

  table->SetNumberOfRows(12);
  for (int i = 0; i < 12; i++)
  {
    table->SetValue(i,0,i+1);
    table->SetValue(i,1,data_2008[i]);
    table->SetValue(i,2,data_2009[i]);
    table->SetValue(i,3,data_2010[i]);
  }

  // Add multiple line plots, setting the colors etc
  vtkPlot *line = 0;

  line = chart->AddPlot(vtkChart::BAR);
  line->SetInputData(table, 0, 1);
  line->SetColor(0, 255, 0, 255);

  line = chart->AddPlot(vtkChart::BAR);
  line->SetInputData(table, 0, 2);
  line->SetColor(255, 0, 0, 255);

  line = chart->AddPlot(vtkChart::BAR);
  line->SetInputData(table, 0, 3);
  line->SetColor(0, 0, 255, 255);

  // Finally render the scene and compare the image to a reference image
  view->GetRenderWindow()->SetMultiSamples(0);
  view->GetRenderWindow()->SetWindowName("QtBarChart");
  view->GetRenderWindow()->Render();
  view->GetInteractor()->Initialize();
  view->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

if(POLICY CMP0020)
  cmake_policy(SET CMP0020 NEW)
  cmake_policy(SET CMP0071 NEW)
endif()

PROJECT(QtBarChart)

find_package(VTK COMPONENTS

  vtkChartsCore
  vtkCommonCore
  vtkCommonDataModel
  vtkInteractionStyle
  vtkRenderingContext2D
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  vtkViewsContext2D
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping QtBarChart: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")

if(vtkGUISupportQt_LOADED OR TARGET VTK::GUISupportQt)
  if (VTK_VERSION VERSION_LESS "8.90.0")
    # Instruct CMake to run moc automatically when needed.
    set(CMAKE_AUTOMOC ON)
  else()
     # Instruct CMake to run moc automatically when needed.
    set(CMAKE_AUTOMOC ON)
    set(CMAKE_AUTOUIC ON)
  endif()
  # We have ui files, this will bring in the macro: qt5_wrap_ui
  find_package(Qt5Widgets REQUIRED QUIET)
else()
  message(STATUS "GuiSupportQt not found.")
  return()
endif()

include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

file(GLOB UI_FILES *.ui)
file(GLOB QT_WRAP *.h)
file(GLOB CXX_FILES *.cxx)

qt5_wrap_ui(UISrcs ${UI_FILES})

if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
  add_executable(QtBarChart MACOSX_BUNDLE
    ${CXX_FILES} ${UISrcs} ${QT_WRAP})
  qt5_use_modules(QtBarChart Core Gui)
  target_link_libraries(QtBarChart ${VTK_LIBRARIES})
else()
  # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
  add_executable(QtBarChart MACOSX_BUNDLE
    ${CXX_FILES} ${UISrcs} ${QT_WRAP})
  qt5_use_modules(QtBarChart Core Gui)
  target_link_libraries(QtBarChart ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS QtBarChart
    MODULES ${VTK_LIBRARIES}
  )
endif()

Download and Build QtBarChart

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

 cd QtBarChart/build

This example requires Qt and VTK.

If VTK and Qt are 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 ..

If Qt is not found on your system, you will need to tell CMake where to find qmake:

cmake -DQT_QMAKE_EXECUTABLE:FILEPATH=/usr/something/qmake  ..

Build the project:

make

and run it:

./QtBarChart

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time. You may also need to add a Qt related path.