/*=========================================================================

  Program:   Visualization Toolkit
  Module:    TestGL2PSMathTextOutput.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 "vtkContext2D.h"
#include "vtkContextItem.h"
#include "vtkContextScene.h"
#include "vtkContextView.h"
#include "vtkGL2PSExporter.h"
#include "vtkIntArray.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPath.h"
#include "vtkPen.h"
#include "vtkPoints.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkTestingInteractor.h"
#include "vtkTextProperty.h"

//----------------------------------------------------------------------------
class GL2PSMathTextOutputTest : public vtkContextItem
{
public:
  static GL2PSMathTextOutputTest* New();
  vtkTypeMacro(GL2PSMathTextOutputTest, vtkContextItem);
  // Paint event for the chart, called whenever the chart needs to be drawn
  virtual bool Paint(vtkContext2D* painter) override;
};

//----------------------------------------------------------------------------
int TestGL2PSMathTextOutput(int, char*[])
{
  // Set up a 2D context view, context test object and add it to the scene
  vtkNew<vtkContextView> view;
  view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
  view->GetRenderWindow()->SetSize(800, 160);
  vtkNew<GL2PSMathTextOutputTest> test;
  view->GetScene()->AddItem(test);

  view->GetRenderWindow()->SetMultiSamples(0);
  view->GetInteractor()->Initialize();
  view->GetInteractor()->Start();

  vtkNew<vtkGL2PSExporter> exp;
  exp->SetRenderWindow(view->GetRenderWindow());
  exp->SetFileFormatToPS();
  exp->CompressOff();
  exp->SetSortToBSP();
  exp->DrawBackgroundOn();
  exp->Write3DPropsAsRasterImageOff();

  std::string fileprefix =
    vtkTestingInteractor::TempDirectory + std::string("/TestGL2PSMathTextOutput");

  exp->SetFilePrefix(fileprefix.c_str());
  exp->Write();

  return EXIT_SUCCESS;
}

// Make our new derived class to draw a diagram
vtkStandardNewMacro(GL2PSMathTextOutputTest);

// This function aims to test the primitives provided by the 2D API.
bool GL2PSMathTextOutputTest::Paint(vtkContext2D* painter)
{
  painter->GetTextProp()->SetColor(.7, .4, .5);
  painter->GetTextProp()->SetFontSize(30);
  painter->DrawString(20, 100, "Bezier curve");
  painter->DrawMathTextString(20, 120, "$\\mathfrak{B\\'ezier\\/curve}:$");
  painter->GetTextProp()->SetFontSize(25);
  painter->DrawMathTextString(40, 20,
    "$B_{[0,n]}(t) = \\sum_{j=0}^{n}\\/t^j"
    "\\left["
    "\\frac{n!}{(n-j)!}\\sum_{i=0}^{j}\\/"
    "\\frac{(-1)^{i+j}P_i}{i!(j-i)!}"
    "\\right] = "
    "(1-t)B_{[0,n-1]}(t) + tB_{[1,n]}(t)$");
  return true;
}
