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 *
* *
* Copyright 2015-2017 Markus Gans *
* *
* The Final Cut is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* The Final Cut is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
************************************************************************/
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#include <final/fapplication.h>
#include <final/fdialog.h>
#include <final/fmessagebox.h>
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//----------------------------------------------------------------------
// class Mandelbrot
//----------------------------------------------------------------------
#pragma pack(push)
#pragma pack(1)
class Mandelbrot : public FDialog
{
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public:
// Constructor
explicit Mandelbrot (FWidget* = 0);
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// Destructor
~Mandelbrot();
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// Event handlers
void onAccel (FAccelEvent*);
void onClose (FCloseEvent*);
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private:
// Methods
virtual void draw();
void adjustSize();
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};
#pragma pack(pop)
//----------------------------------------------------------------------
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Mandelbrot::Mandelbrot (FWidget* parent)
: FDialog(parent)
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{
setText ("Mandelbrot set");
}
//----------------------------------------------------------------------
Mandelbrot::~Mandelbrot()
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{ }
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//----------------------------------------------------------------------
void Mandelbrot::draw()
{
int iter, max_iter;
int Cols, Lines, xoffset, yoffset, current_line;
double x, y, xtemp, x0, y0, dX, dY;
double x_min, x_max, y_min, y_max;
FDialog::draw();
x_min = -2.20;
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x_max = 1.00;
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y_min = -1.05;
y_max = 1.05;
max_iter = 99;
xoffset = 2;
yoffset = 2;
current_line = 0;
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Cols = getClientWidth();
Lines = getClientHeight();
dX = (x_max - x_min) / (Cols - 1);
dY = (y_max - y_min) / Lines;
for (y0 = y_min; y0 < y_max && current_line < Lines; y0 += dY)
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{
current_line++;
setPrintPos (xoffset, yoffset + current_line);
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for (x0 = x_min; x0 < x_max; x0 += dX)
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{
x = 0.0;
y = 0.0;
iter = 0;
while ( x * x + y * y < 4 && iter < max_iter )
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{
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(' ');
}
}
}
//----------------------------------------------------------------------
void Mandelbrot::onAccel (FAccelEvent* ev)
{
close();
ev->accept();
}
//----------------------------------------------------------------------
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void Mandelbrot::onClose (FCloseEvent* ev)
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{
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int ret = FMessageBox::info ( this, "Quit"
, "Do you really want\n"
"to quit the program ?"
, FMessageBox::Yes
, FMessageBox::No );
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if ( ret == FMessageBox::Yes )
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ev->accept();
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else
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ev->ignore();
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}
//----------------------------------------------------------------------
void Mandelbrot::adjustSize()
{
int h = getParentWidget()->getHeight() - 1;
int w = getParentWidget()->getWidth() - 10;
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setGeometry(6, 1, w, h, false);
FDialog::adjustSize();
}
//----------------------------------------------------------------------
// main part
//----------------------------------------------------------------------
int main (int argc, char* argv[])
{
// Create the application object
FApplication app(argc, argv);
// Create a simple dialog box
Mandelbrot mb(&app);
mb.setGeometry (6, 1, 70, 23);
mb.addAccelerator('q'); // press 'q' to quit
mb.setShadow();
// Set the mandelbrot object as main widget
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app.setMainWidget(&mb);
// Show and start the application
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mb.show();
return app.exec();
}