164 lines
4.7 KiB
C++
164 lines
4.7 KiB
C++
/***********************************************************************
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* mandelbrot.cpp - Shows a ASCII based Mandelbrot set *
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* *
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* This file is part of the Final Cut widget toolkit *
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* *
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* Copyright 2015-2019 Markus Gans *
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* *
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* The Final Cut is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Lesser General Public License *
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* as published by the Free Software Foundation; either version 3 of *
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* the License, or (at your option) any later version. *
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* *
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* The Final Cut is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this program. If not, see *
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* <http://www.gnu.org/licenses/>. *
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***********************************************************************/
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#include <final/final.h>
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namespace fc = finalcut::fc;
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using finalcut::FPoint;
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using finalcut::FSize;
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//----------------------------------------------------------------------
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// class Mandelbrot
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//----------------------------------------------------------------------
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class Mandelbrot : public finalcut::FDialog
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{
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public:
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// Constructor
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explicit Mandelbrot (finalcut::FWidget* = nullptr);
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// Destructor
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~Mandelbrot();
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// Event handlers
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void onKeyPress (finalcut::FKeyEvent*) override;
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void onClose (finalcut::FCloseEvent*) override;
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private:
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// Methods
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void draw() override;
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void adjustSize() override;
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};
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//----------------------------------------------------------------------
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Mandelbrot::Mandelbrot (finalcut::FWidget* parent)
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: finalcut::FDialog(parent)
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{
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setText ("Mandelbrot set");
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}
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//----------------------------------------------------------------------
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Mandelbrot::~Mandelbrot()
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{ }
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//----------------------------------------------------------------------
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void Mandelbrot::draw()
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{
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finalcut::FDialog::draw();
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double x_min{-2.20};
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double x_max{+1.00};
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double y_min{-1.05};
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double y_max{+1.05};
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int max_iter{99};
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int xoffset{2};
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int yoffset{2};
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int current_line{0};
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int Cols = int(getClientWidth());
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int Lines = int(getClientHeight());
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double dX = (x_max - x_min) / (Cols - 1);
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double dY = (y_max - y_min) / Lines;
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for (double y0 = y_min; y0 < y_max && current_line < Lines; y0 += dY)
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{
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current_line++;
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print() << FPoint(xoffset, yoffset + current_line);
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for (double x0 = x_min; x0 < x_max; x0 += dX)
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{
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double x{0.0};
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double y{0.0};
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int iter{0};
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while ( x * x + y * y < 4 && iter < max_iter )
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{
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double xtemp = x * x - y * y + x0;
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y = 2 * x * y + y0;
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x = xtemp;
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iter++;
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}
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if ( iter < max_iter )
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setColor(fc::Black, iter % 16);
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else
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setColor(fc::Black, 0);
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print(' ');
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}
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}
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}
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//----------------------------------------------------------------------
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void Mandelbrot::onKeyPress (finalcut::FKeyEvent* ev)
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{
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if ( ! ev )
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return;
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if ( ev->key() == 'q' )
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{
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close();
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ev->accept();
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}
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else
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finalcut::FDialog::onKeyPress(ev);
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}
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//----------------------------------------------------------------------
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void Mandelbrot::onClose (finalcut::FCloseEvent* ev)
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{
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finalcut::FApplication::closeConfirmationDialog (this, ev);
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}
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//----------------------------------------------------------------------
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void Mandelbrot::adjustSize()
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{
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std::size_t h = getDesktopHeight() - 1;
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std::size_t w = getDesktopWidth() - 10;
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setGeometry(FPoint(6, 1), FSize(w, h), false);
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finalcut::FDialog::adjustSize();
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}
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//----------------------------------------------------------------------
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// main part
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//----------------------------------------------------------------------
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int main (int argc, char* argv[])
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{
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// Create the application object
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finalcut::FApplication app(argc, argv);
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// Create a simple dialog box
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Mandelbrot mb(&app);
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mb.setGeometry (FPoint(6, 1), FSize(70, 23));
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mb.setShadow();
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// Set the mandelbrot object as main widget
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app.setMainWidget(&mb);
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// Show and start the application
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mb.show();
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return app.exec();
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}
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