59 lines
1.4 KiB
Java
59 lines
1.4 KiB
Java
import javax.swing.*;
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import java.awt.*;
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/**
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* SierpinskyTriangle.java
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* Draws a SierpinskyTriangle in a JFrame
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* The order of complexity is given from command line, but
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* defaults to 3
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*
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* @author Istarnion
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*/
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class SierpinskyTriangle {
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public static void main(String[] args) {
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int i = 3; // Default to 3
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if(args.length >= 1) {
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try {
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i = Integer.parseInt(args[0]);
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}
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catch(NumberFormatException e) {
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System.out.println("Usage: 'java SierpinskyTriangle [level]'\nNow setting level to "+i);
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}
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}
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final int level = i;
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JFrame frame = new JFrame("Sierpinsky Triangle - Java");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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JPanel panel = new JPanel() {
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@Override
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public void paintComponent(Graphics g) {
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g.setColor(Color.BLACK);
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drawSierpinskyTriangle(level, 20, 20, 360, (Graphics2D)g);
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}
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};
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panel.setPreferredSize(new Dimension(400, 400));
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frame.add(panel);
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frame.pack();
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frame.setResizable(false);
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frame.setLocationRelativeTo(null);
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frame.setVisible(true);
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}
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private static void drawSierpinskyTriangle(int level, int x, int y, int size, Graphics2D g) {
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if(level <= 0) return;
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g.drawLine(x, y, x+size, y);
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g.drawLine(x, y, x, y+size);
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g.drawLine(x+size, y, x, y+size);
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drawSierpinskyTriangle(level-1, x, y, size/2, g);
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drawSierpinskyTriangle(level-1, x+size/2, y, size/2, g);
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drawSierpinskyTriangle(level-1, x, y+size/2, size/2, g);
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}
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}
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