141 lines
3.2 KiB
C++
141 lines
3.2 KiB
C++
// File: mandelbrot.cpp
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#include "fapp.h"
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#include "fdialog.h"
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#include "fmessagebox.h"
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//----------------------------------------------------------------------
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// class Mandelbrot
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//----------------------------------------------------------------------
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#pragma pack(push)
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#pragma pack(1)
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class Mandelbrot : public FDialog
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{
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private:
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virtual void draw();
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void adjustSize();
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public:
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explicit Mandelbrot (FWidget* = 0); // constructor
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~Mandelbrot(); // destructor
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void onAccel (FAccelEvent*);
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void onClose (FCloseEvent*);
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};
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#pragma pack(pop)
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//----------------------------------------------------------------------
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Mandelbrot::Mandelbrot (FWidget* parent)
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: 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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int iter, max_iter;
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int Cols, Lines, xoffset, yoffset, current_line;
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double x, y, xtemp, x0, y0, dX, dY;
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double x_min, x_max, y_min, y_max;
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FDialog::draw();
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x_min = -2.20;
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x_max = 1.00;
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y_min = -1.05;
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y_max = 1.05;
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max_iter = 99;
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xoffset = xpos+xmin;
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yoffset = ypos+ymin;
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Cols = getClientWidth();
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Lines = getClientHeight();
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current_line = 1;
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dX = (x_max - x_min) / (Cols - 1);
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dY = (y_max - y_min) / Lines;
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for (y0=y_min; y0 < y_max && current_line <= Lines; y0+=dY)
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{
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gotoxy (xoffset, yoffset+current_line);
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for (x0=x_min; x0 < x_max; x0+=dX)
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{
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x = 0.0;
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y = 0.0;
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iter = 0;
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while ( x*x + y*y < 4 && iter < max_iter )
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{
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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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current_line++;
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}
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setUpdateVTerm(true);
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}
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//----------------------------------------------------------------------
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void Mandelbrot::onAccel (FAccelEvent* ev)
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{
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close();
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ev->accept();
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}
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//----------------------------------------------------------------------
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void Mandelbrot::onClose (FCloseEvent* ev)
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{
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int ret = FMessageBox::info ( this, "Quit"
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, "Do you really want\n"
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"to quit the program ?"
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, FMessageBox::Yes
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, 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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}
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//----------------------------------------------------------------------
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void Mandelbrot::adjustSize()
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{
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int h = parentWidget()->getHeight() - 1;
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int w = parentWidget()->getWidth() - 10;
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setGeometry(6, 1, w, h, false);
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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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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 (6, 1, 70, 23);
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mb.addAccelerator('q'); // press 'q' to quit
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mb.setShadow();
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app.setMainWidget(&mb);
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mb.show();
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return app.exec();
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}
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