finalcut/examples/mandelbrot.cpp

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/***********************************************************************
* mandelbrot.cpp - Shows a ASCII based Mandelbrot set *
* *
* This file is part of the FINAL CUT widget toolkit *
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* *
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* Copyright 2015-2020 Markus Gans *
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* *
* FINAL CUT is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 3 of *
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* the License, or (at your option) any later version. *
* *
* FINAL CUT is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
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#include <final/final.h>
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namespace fc = finalcut::fc;
using finalcut::FPoint;
using finalcut::FSize;
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//----------------------------------------------------------------------
// class Mandelbrot
//----------------------------------------------------------------------
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class Mandelbrot final : public finalcut::FDialog
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{
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public:
// Constructor
explicit Mandelbrot (finalcut::FWidget* = nullptr);
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// Destructor
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~Mandelbrot() override = default;
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// Event handlers
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void onKeyPress (finalcut::FKeyEvent*) override;
void onClose (finalcut::FCloseEvent*) override;
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private:
// Methods
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void draw() override;
void adjustSize() override;
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};
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//----------------------------------------------------------------------
Mandelbrot::Mandelbrot (finalcut::FWidget* parent)
: finalcut::FDialog{parent}
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{
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FDialog::setText ("Mandelbrot set");
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}
//----------------------------------------------------------------------
void Mandelbrot::draw()
{
finalcut::FDialog::draw();
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const double x_min{-2.20};
const double x_max{+1.00};
const double y_min{-1.05};
const double y_max{+1.05};
const int max_iter{99};
const int xoffset{2};
const int yoffset{2};
const auto Cols = int(getClientWidth());
const auto Lines = int(getClientHeight());
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int current_line{0};
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if ( Cols < 2 || Lines < 2 )
return;
const double dX = (x_max - x_min) / (Cols - 1);
const double dY = (y_max - y_min) / Lines;
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double y0 = y_min;
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while ( y0 < y_max && current_line < Lines )
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{
current_line++;
print() << FPoint{xoffset, yoffset + current_line};
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double x0 = x_min;
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while ( x0 < x_max )
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{
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double x{0.0};
double y{0.0};
int iter{0};
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while ( x * x + y * y < 4 && iter < max_iter )
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{
const double xtemp = x * x - y * y + x0;
y = 2 * x * y + y0;
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x = xtemp;
iter++;
}
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if ( iter < max_iter )
setColor(fc::Black, iter % 16);
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else
setColor(fc::Black, 0);
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print(' ');
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x0 += dX;
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}
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y0 += dY;
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}
}
//----------------------------------------------------------------------
void Mandelbrot::onKeyPress (finalcut::FKeyEvent* ev)
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{
if ( ! ev )
return;
if ( ev->key() == 'q' )
{
close();
ev->accept();
}
else
finalcut::FDialog::onKeyPress(ev);
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}
//----------------------------------------------------------------------
void Mandelbrot::onClose (finalcut::FCloseEvent* ev)
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{
finalcut::FApplication::closeConfirmationDialog (this, ev);
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}
//----------------------------------------------------------------------
void Mandelbrot::adjustSize()
{
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std::size_t h = getDesktopHeight();
std::size_t w = getDesktopWidth();
if ( h > 1 )
h--;
if ( w > 10 )
w -= 10;
setGeometry(FPoint{6, 1}, FSize{w, h}, false);
finalcut::FDialog::adjustSize();
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}
//----------------------------------------------------------------------
// main part
//----------------------------------------------------------------------
int main (int argc, char* argv[])
{
// Create the application object
finalcut::FApplication app{argc, argv};
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// Create a simple dialog box
Mandelbrot mb{&app};
mb.setGeometry (FPoint{6, 1}, FSize{70, 23});
mb.setShadow(); // Instead of the transparent window shadow
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// Set the mandelbrot object as main widget
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finalcut::FWidget::setMainWidget(&mb);
// Show and start the application
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mb.show();
return app.exec();
}