VTK/Examples/Cxx/Plotting/Diagram

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VTK Examples Baseline Plotting TestDiagram.png

Diagram.cxx

#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkObjectFactory.h"
#include "vtkContext2D.h"
#include "vtkContextItem.h"
#include "vtkContextActor.h"
#include "vtkContextScene.h"
#include "vtkPen.h"
#include "vtkBrush.h"
#include "vtkTextProperty.h"
#include "vtkOpenGLContextDevice2D.h"
#include "vtkStdString.h"
 
#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()
 
//----------------------------------------------------------------------------
class APIDiagram : public vtkContextItem
{
public:
  static APIDiagram *New();
  vtkTypeMacro(APIDiagram, vtkContextItem);
  // Paint event for the chart, called whenever the chart needs to be drawn
  virtual bool Paint(vtkContext2D *painter);
};
 
//----------------------------------------------------------------------------
int main( int, char *[] )
{
  // Set up a 2D chart actor, APIDiagram object andn add them to the renderer
  VTK_CREATE(vtkContextActor, actor);
  VTK_CREATE(APIDiagram, diagram);
  actor->GetScene()->AddItem(diagram);
  VTK_CREATE(vtkRenderer, renderer);
  renderer->SetBackground(.2, .3, .4);
  VTK_CREATE(vtkRenderWindow, renderWindow);
  renderWindow->SetSize(800, 600);
  renderWindow->AddRenderer(renderer);
  renderer->AddActor(actor);
 
  VTK_CREATE(vtkRenderWindowInteractor, interactor);
  interactor->SetRenderWindow(renderWindow);
  renderWindow->SetMultiSamples(0);
  renderWindow->Render();
 
  interactor->Start();
 
  return true;
}
 
// Make our new derived class to draw a diagram
vtkStandardNewMacro(APIDiagram);
// This function draws our API diagram
bool APIDiagram::Paint(vtkContext2D *painter)
{
  // Drawing a hard wired diagram 800x600 as a demonstration of the 2D API
  painter->GetTextProp()->SetVerticalJustificationToCentered();
  painter->GetTextProp()->SetJustificationToCentered();
  painter->GetTextProp()->SetColor(0.0, 0.0, 0.0);
  painter->GetTextProp()->SetFontSize(24);
  painter->GetPen()->SetColor(0, 0, 0);
 
  painter->GetBrush()->SetColor(100, 255, 100);
  painter->DrawRect(100, 50, 200, 100);
  painter->DrawString(200, 100, "OpenGL");
 
  painter->GetBrush()->SetColor(255, 100, 0);
  painter->DrawRect(300, 50, 200, 100);
  painter->DrawString(400, 100, "Others?");
 
  painter->GetBrush()->SetColor(100, 0, 255);
  painter->DrawRect(500, 50, 200, 100);
  painter->DrawString(600, 100, "Others?");
 
  painter->GetBrush()->SetColor(180, 180, 255);
  painter->DrawRect(100, 150, 600, 100);
  painter->DrawString(400, 200, "2D API");
 
  painter->GetBrush()->SetColor(255, 255, 180);
  painter->DrawRect(100, 250, 600, 200);
  painter->DrawString(400, 400, "Canvas API");
 
  painter->GetBrush()->SetColor(180, 255, 180);
  painter->DrawRect(100, 250, 300, 100);
  painter->DrawString(250, 300, "Point Mark");
 
  painter->GetBrush()->SetColor(255, 255, 255);
  painter->DrawRect(100, 450, 600, 100);
  painter->DrawString(400, 500, "Canvas View");
 
  return true;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(Diagram)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(Diagram MACOSX_BUNDLE Diagram.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(Diagram ${VTK_LIBRARIES})
else()
  target_link_libraries(Diagram vtkHybrid vtkWidgets)
endif()

Download and Build Diagram

Click here to download Diagram. and its CMakeLists.txt file.

Once the tarball Diagram.tar has been downloaded and extracted,

cd Diagram/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:

./Diagram

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.