63 lines
1.9 KiB
Java
63 lines
1.9 KiB
Java
import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.geom.Path2D;
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import javax.swing.*;
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public class SierpinskiTriangle extends JPanel {
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private final int dim = 512;
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private final int margin = 20;
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private int limit = dim;
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public SierpinskiTriangle() {
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setPreferredSize(new Dimension(dim + 2 * margin, dim + 2 * margin));
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setBackground(Color.white);
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setForeground(Color.green.darker());
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new Timer(2000, (ActionEvent e) -> {
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limit /= 2;
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if (limit <= 2)
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limit = dim;
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repaint();
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}).start();
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}
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void drawTriangle(Graphics2D g, int x, int y, int size) {
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if (size <= limit) {
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Path2D p = new Path2D.Float();
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p.moveTo(x, y);
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p.lineTo(x + size / 2, y + size);
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p.lineTo(x - size / 2, y + size);
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g.fill(p);
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} else {
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size /= 2;
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drawTriangle(g, x, y, size);
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drawTriangle(g, x + size / 2, y + size, size);
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drawTriangle(g, x - size / 2, y + size, size);
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}
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}
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@Override
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public void paintComponent(Graphics gg) {
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super.paintComponent(gg);
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Graphics2D g = (Graphics2D) gg;
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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g.translate(margin, margin);
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drawTriangle(g, dim / 2, 0, dim);
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(() -> {
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JFrame f = new JFrame();
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f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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f.setTitle("Sierpinski Triangle");
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f.setResizable(false);
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f.add(new SierpinskiTriangle(), BorderLayout.CENTER);
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f.pack();
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f.setLocationRelativeTo(null);
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f.setVisible(true);
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});
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}
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}
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