text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    TestDiagram.cxx
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  
  =========================================================================*/
  
  #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 "vtkStdString.h"
  #include "vtkNew.h"
  
  #include "vtkRegressionTestImage.h"
  
  //----------------------------------------------------------------------------
  class APIDiagram : public vtkContextItem
  {
  public:
    static APIDiagram *New();
    vtkTypeMacro(APIDiagram, vtkContextItem);
    // Paint event for the chart, called whenever the chart needs to be drawn
    bool Paint(vtkContext2D *painter) VTK_OVERRIDE;
  };
  
  //----------------------------------------------------------------------------
  int TestDiagram(int, char * [])
  {
    // Set up a 2D chart actor, APIDiagram object andn add them to the renderer
    vtkNew<vtkContextActor> actor;
    vtkNew<APIDiagram> diagram;
    actor->GetScene()->AddItem(diagram.GetPointer());
    vtkNew<vtkRenderer> renderer;
    renderer->SetBackground(1.0, 1.0, 1.0);
    vtkNew<vtkRenderWindow> renderWindow;
    renderWindow->SetSize(800, 600);
    renderWindow->AddRenderer(renderer.GetPointer());
    renderer->AddActor(actor.GetPointer());
  
    vtkNew<vtkRenderWindowInteractor> interactor;
    interactor->SetRenderWindow(renderWindow.GetPointer());
    renderWindow->SetMultiSamples(0);
    interactor->Initialize();
    interactor->Start();
    return EXIT_SUCCESS;
  }
  
  // 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;
  }
  