Julia set

Julia set is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Generate and draw a Julia set.

Cf

• Mandelbrot Set

Java

Works with: Java version 8

<lang java>import java.awt.*; import java.awt.image.BufferedImage; import javax.swing.*;

public class JuliaSet extends JPanel {

   private final int maxIter = 300;
   private final double zoom = 1;
   private double cY, cX;

   public JuliaSet() {
       setPreferredSize(new Dimension(800, 600));
       setBackground(Color.white);
   }

   void drawJuliaSet(Graphics2D g) {
       int w = getWidth();
       int h = getHeight();
       BufferedImage image = new BufferedImage(w, h,
               BufferedImage.TYPE_INT_RGB);

       cX = -0.7;
       cY = 0.27015;
       double moveX = 0, moveY = 0;
       double zx, zy;

       for (int x = 0; x < w; x++) {
           for (int y = 0; y < h; y++) {
               zx = 1.5 * (x - w / 2) / (0.5 * zoom * w) + moveX;
               zy = (y - h / 2) / (0.5 * zoom * h) + moveY;
               float i = maxIter;
               while (zx * zx + zy * zy < 4 && i > 0) {
                   double tmp = zx * zx - zy * zy + cX;
                   zy = 2.0 * zx * zy + cY;
                   zx = tmp;
                   i--;
               }
               int c = Color.HSBtoRGB((maxIter / i) % 1, 1, i > 0 ? 1 : 0);
               image.setRGB(x, y, c);
           }
       }
       g.drawImage(image, 0, 0, null);
   }

   @Override
   public void paintComponent(Graphics gg) {
       super.paintComponent(gg);
       Graphics2D g = (Graphics2D) gg;
       g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
               RenderingHints.VALUE_ANTIALIAS_ON);
       drawJuliaSet(g);
   }

   public static void main(String[] args) {
       SwingUtilities.invokeLater(() -> {
           JFrame f = new JFrame();
           f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           f.setTitle("Julia Set");
           f.setResizable(false);
           f.add(new JuliaSet(), BorderLayout.CENTER);
           f.pack();
           f.setLocationRelativeTo(null);
           f.setVisible(true);
       });
   }

}</lang>