76 lines
2.0 KiB
Java
76 lines
2.0 KiB
Java
import java.awt.*;
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import java.awt.geom.Path2D;
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import javax.swing.*;
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public class PythagorasTree extends JPanel {
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final int depthLimit = 7;
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float hue = 0.15f;
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public PythagorasTree() {
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setPreferredSize(new Dimension(640, 640));
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setBackground(Color.white);
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}
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private void drawTree(Graphics2D g, float x1, float y1, float x2, float y2,
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int depth) {
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if (depth == depthLimit)
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return;
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float dx = x2 - x1;
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float dy = y1 - y2;
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float x3 = x2 - dy;
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float y3 = y2 - dx;
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float x4 = x1 - dy;
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float y4 = y1 - dx;
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float x5 = x4 + 0.5F * (dx - dy);
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float y5 = y4 - 0.5F * (dx + dy);
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Path2D square = new Path2D.Float();
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square.moveTo(x1, y1);
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square.lineTo(x2, y2);
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square.lineTo(x3, y3);
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square.lineTo(x4, y4);
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square.closePath();
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g.setColor(Color.getHSBColor(hue + depth * 0.02f, 1, 1));
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g.fill(square);
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g.setColor(Color.lightGray);
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g.draw(square);
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Path2D triangle = new Path2D.Float();
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triangle.moveTo(x3, y3);
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triangle.lineTo(x4, y4);
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triangle.lineTo(x5, y5);
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triangle.closePath();
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g.setColor(Color.getHSBColor(hue + depth * 0.035f, 1, 1));
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g.fill(triangle);
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g.setColor(Color.lightGray);
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g.draw(triangle);
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drawTree(g, x4, y4, x5, y5, depth + 1);
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drawTree(g, x5, y5, x3, y3, depth + 1);
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}
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@Override
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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drawTree((Graphics2D) g, 275, 500, 375, 500, 0);
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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("Pythagoras Tree");
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f.setResizable(false);
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f.add(new PythagorasTree(), 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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