Example: gui_text_fonts_example

C++ example source code:

/*                    _
                     | |    Mobile Robot Programming Toolkit (MRPT)
 _ __ ___  _ __ _ __ | |_
| '_ ` _ \| '__| '_ \| __|          https://www.mrpt.org/
| | | | | | |  | |_) | |_
|_| |_| |_|_|  | .__/ \__|     https://github.com/MRPT/mrpt/
               | |
               |_|

 Copyright (c) 2005-2026, Individual contributors, see AUTHORS file
 See: https://www.mrpt.org/Authors - All rights reserved.
 SPDX-License-Identifier: BSD-3-Clause
*/

#include <mrpt/gui/CDisplayWindow.h>

#include <iostream>

namespace
{
// ------------------------------------------------------
//              TestFonts
// ------------------------------------------------------
void TestFonts()
{
  using namespace mrpt;
  using namespace mrpt::gui;
  using namespace mrpt::img;
  using namespace std;

  CImage img(400, 300);

  img.filledRectangle({0, 0}, {400, 300}, TColor(0x50, 0x50, 0x50));

  int y = 10;
  img.selectTextFont("5x7");
  img.textOut({10, y}, "Hello World! with font \"5x7\"", TColor::white());
  y += 20;

  img.selectTextFont("6x13");
  img.textOut({10, y}, "Hello World! with font \"6x13\"", TColor::white());
  y += 20;

  img.selectTextFont("6x13B");
  img.textOut({10, y}, "Hello World! with font \"6x13B\"", TColor::white());
  y += 20;

  img.selectTextFont("6x13O");
  img.textOut({10, y}, "Hello World! with font \"6x13O\"", TColor::white());
  y += 20;

  img.selectTextFont("9x15");
  img.textOut({10, y}, "Hello World! with font \"9x15\"", TColor::white());
  y += 20;

  img.selectTextFont("9x15B");
  img.textOut({10, y}, "Hello World! with font \"9x15B\"", TColor::white());
  y += 20;

  img.selectTextFont("18x18ja");
  img.textOut({10, y}, "MRPTのフォントは易しいです!", TColor::white());
  y += 20;

  img.selectTextFont("10x20");
  img.textOut({10, y}, "Hello World! with font \"10x20\"", TColor::white());
  y += 20;

  CDisplayWindow win1("MRPT - Demo of text fonts render");
  win1.setPos(10, 10);
  win1.showImage(img);

  cout << "Push a key in the console or in the window to continue...";
  win1.waitForKey();
  cout << "Done\n";
}
}  // namespace

// ------------------------------------------------------
//                      MAIN
// ------------------------------------------------------
int main()
{
  try
  {
    TestFonts();
    return 0;
  }
  catch (const std::exception& e)
  {
    std::cerr << "MRPT error: " << mrpt::exception_to_str(e) << "\n";
    return -1;
  }
}