Data commit

Task/Barnsley-fern/Java/barnsley-fern.java

@@ -0,0 +1,68 @@
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import javax.swing.*;
+
+public class BarnsleyFern extends JPanel {
+
+    BufferedImage img;
+
+    public BarnsleyFern() {
+        final int dim = 640;
+        setPreferredSize(new Dimension(dim, dim));
+        setBackground(Color.white);
+        img = new BufferedImage(dim, dim, BufferedImage.TYPE_INT_ARGB);
+        createFern(dim, dim);
+    }
+
+    void createFern(int w, int h) {
+        double x = 0;
+        double y = 0;
+
+        for (int i = 0; i < 200_000; i++) {
+            double tmpx, tmpy;
+            double r = Math.random();
+
+            if (r <= 0.01) {
+                tmpx = 0;
+                tmpy = 0.16 * y;
+            } else if (r <= 0.08) {
+                tmpx = 0.2 * x - 0.26 * y;
+                tmpy = 0.23 * x + 0.22 * y + 1.6;
+            } else if (r <= 0.15) {
+                tmpx = -0.15 * x + 0.28 * y;
+                tmpy = 0.26 * x + 0.24 * y + 0.44;
+            } else {
+                tmpx = 0.85 * x + 0.04 * y;
+                tmpy = -0.04 * x + 0.85 * y + 1.6;
+            }
+            x = tmpx;
+            y = tmpy;
+
+            img.setRGB((int) Math.round(w / 2 + x * w / 11),
+                    (int) Math.round(h - y * h / 11), 0xFF32CD32);
+        }
+    }
+
+    @Override
+    public void paintComponent(Graphics gg) {
+        super.paintComponent(gg);
+        Graphics2D g = (Graphics2D) gg;
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                RenderingHints.VALUE_ANTIALIAS_ON);
+
+        g.drawImage(img, 0, 0, null);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            JFrame f = new JFrame();
+            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            f.setTitle("Barnsley Fern");
+            f.setResizable(false);
+            f.add(new BarnsleyFern(), BorderLayout.CENTER);
+            f.pack();
+            f.setLocationRelativeTo(null);
+            f.setVisible(true);
+        });
+    }
+}