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package fractals;
/**
* An example of the use of our pixel drawing framework
* @author Sjaak Smetsers
* @version 1.0, 14-03-2013
*/
public class Mandelbrot {
public final static int MAX_MANDEL_NUMBER = 100; // infinity will be this + 1
public Mandelbrot() {
MainWindow fractal_win = new MainWindow ();
GridFiller filler = new GridFiller (fractal_win.getGrid());
filler.fill();
System.out.println(Integer.toString(mandelNumber(0,0)));
}
public static void main(String args[]) {
Mandelbrot mandelbrot = new Mandelbrot();
}
public static int mandelNumber(double x, double y) {
double x_n = x, y_n = y;
int n = 0;
while (x_n * x_n + y_n * y_n <= 4 && n <= MAX_MANDEL_NUMBER) {
double new_x_n = x_n * x_n - y_n * y_n + x;
y_n = 2 * x_n * y_n + y;
x_n = new_x_n;
n++;
}
return n;
}
private class GridFiller {
private Grid grid; // the grid to be filled
/**
* The constructor
* @param grid to be filled
*/
public GridFiller (Grid grid) {
this.grid = grid;
}
private final double MIN_X = -2.5, MAX_X = 2.5, MIN_Y = -2.5, MAX_Y = 2.5;
/**
* fills the whole grid with some arbitrarily chosen color
*
*/
public void fill () {
int grid_w = grid.getWidth(), grid_h = grid.getHeight();
for (float i = 0; i < grid_w; i++) {
for (float j = 0; j < grid_h; j++) {
int grayscale = mandelNumber(MIN_X + (i / grid_w) * (MAX_X - MIN_X), MIN_Y + (j / grid_h) * (MAX_Y - MIN_Y)) * 256 / MAX_MANDEL_NUMBER;
int[] color = {grayscale, grayscale, grayscale};
grid.setPixel((int) i, (int) j, color);
}
}
}
}
}
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