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BarChart

vtk-examples/Cxx/Plotting/BarChart


Description

This example shows how to create a Bar Chart.

Also see the BarChartQt example.

Question

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

Code

BarChart.cxx

#include <vtkAxis.h>
#include <vtkChartXY.h>
#include <vtkColor.h>
#include <vtkColorSeries.h>
#include <vtkContextScene.h>
#include <vtkContextView.h>
#include <vtkIntArray.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPen.h>
#include <vtkPlot.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTable.h>
#include <vtkTextProperty.h>
#include <vtkVersion.h>

// 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*[])
{
  // Colors
  vtkNew<vtkColorSeries> colorSeries;
  // colorSeries->SetColorScheme(
  //    vtkColorSeries::BREWER_SEQUENTIAL_YELLOW_ORANGE_BROWN_3);
  colorSeries->SetColorScheme(vtkColorSeries::BREWER_DIVERGING_SPECTRAL_3);
  // colorSeries->SetColorScheme(vtkColorSeries::BREWER_DIVERGING_PURPLE_ORANGE_3);
  // colorSeries->SetColorScheme(
  //    vtkColorSeries::BREWER_DIVERGING_BROWN_BLUE_GREEN_3);
  // colorSeries->SetColorScheme(vtkColorSeries::BREWER_SEQUENTIAL_BLUE_GREEN_3);
  // colorSeries->SetColorScheme(vtkColorSeries::BREWER_SEQUENTIAL_BLUE_PURPLE_3);

  vtkNew<vtkNamedColors> colors;
  vtkColor3d backgroundColor = colors->GetColor3d("Seashell");
  vtkColor3d axisColor = colors->GetColor3d("Black");
  vtkColor3d titleColor = colors->GetColor3d("MidnightBlue");

  // Set up a 2D scene, add an XY chart to it
  vtkNew<vtkContextView> view;
  view->GetRenderer()->SetBackground(backgroundColor.GetData());
  view->GetRenderWindow()->SetSize(640, 480);
  view->GetRenderWindow()->SetWindowName("BarChart");

  vtkNew<vtkChartXY> chart;
  view->GetScene()->AddItem(chart);

  // Set various properties
  vtkAxis* xAxis = chart->GetAxis(vtkAxis::BOTTOM);
  xAxis->SetTitle("Monthly");
  xAxis->GetTitleProperties()->SetColor(axisColor.GetData());
  xAxis->GetTitleProperties()->SetFontSize(16);
  xAxis->GetTitleProperties()->ItalicOn();
  xAxis->GetLabelProperties()->SetColor(axisColor.GetData());
  xAxis->GetGridPen()->SetColor(colors->GetColor4ub("Black"));

  vtkAxis* yAxis = chart->GetAxis(vtkAxis::LEFT);
  yAxis->SetTitle("Circulation");
  yAxis->GetTitleProperties()->SetColor(axisColor.GetData());
  yAxis->GetTitleProperties()->SetFontSize(16);
  yAxis->GetTitleProperties()->ItalicOn();
  yAxis->GetLabelProperties()->SetColor(axisColor.GetData());
  yAxis->GetGridPen()->SetColor(colors->GetColor4ub("Black"));

  chart->SetTitle("Circulation 2008, 2009, 2010");
  chart->GetTitleProperties()->SetFontSize(24);
  chart->GetTitleProperties()->SetColor(titleColor.GetData());
  chart->GetTitleProperties()->BoldOn();

  // Create a table with some points in it...
  vtkNew<vtkTable> table;

  vtkNew<vtkIntArray> arrMonth;
  arrMonth->SetName("Month");
  table->AddColumn(arrMonth);

  vtkNew<vtkIntArray> arr2008;
  arr2008->SetName("2008");
  table->AddColumn(arr2008);

  vtkNew<vtkIntArray> arr2009;
  arr2009->SetName("2009");
  table->AddColumn(arr2009);

  vtkNew<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->SetColor(colorSeries->GetColor(0).GetRed() / 255.0,
                 colorSeries->GetColor(0).GetGreen() / 255.0,
                 colorSeries->GetColor(0).GetBlue() / 255.0);
  line->SetInputData(table, 0, 1);

  line = chart->AddPlot(vtkChart::BAR);
  line->SetColor(colorSeries->GetColor(1).GetRed() / 255.0,
                 colorSeries->GetColor(1).GetGreen() / 255.0,
                 colorSeries->GetColor(1).GetBlue() / 255.0);
  line->SetInputData(table, 0, 2);

  line = chart->AddPlot(vtkChart::BAR);
  line->SetColor(colorSeries->GetColor(2).GetRed() / 255.0,
                 colorSeries->GetColor(2).GetGreen() / 255.0,
                 colorSeries->GetColor(2).GetBlue() / 255.0);
  line->SetInputData(table, 0, 3);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BarChart)

find_package(VTK COMPONENTS 
  vtkChartsCore
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkInteractionStyle
  vtkRenderingContext2D
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  vtkViewsContext2D
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping BarChart: ${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(BarChart MACOSX_BUNDLE BarChart.cxx )
  target_link_libraries(BarChart PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(BarChart MACOSX_BUNDLE BarChart.cxx )
  target_link_libraries(BarChart PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS BarChart
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build BarChart

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

cd BarChart/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:

./BarChart

WINDOWS USERS

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