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Author: Dwinin (posted 2014-07-29 10:59:34, viewed 168 times)

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import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class Draw extends JPanel implements MouseListener, MouseMotionListener {
   
   List<Point> history;
   
   {
      setBackground(Color.white);
      setSize(800, 600);
      setPreferredSize(getSize());
      
      history = new ArrayList<Point>();
      addMouseListener(this);
      addMouseMotionListener(this);
   }
   
   @Override
   public void paint(Graphics gg) {
      Graphics2D g = (Graphics2D) gg;
      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      g.setColor(Color.black);
      if (history.size() > 1) {
         Point c = history.get(history.size() - 1);
         Point p = history.get(history.size() - 2);
         if (c.connected)
            g.drawLine(c.x, c.y, p.x, p.y);
         for (int i = history.size() - 3; i >= 0; i--) {
            Point t = history.get(i);
            int dx = t.x - c.x;
            int dy = t.y - c.y;
            int distSq = dx * dx + dy * dy;
            if (distSq < 625 && distSq > 0 && Math.random() < .5) {
               
               int alpha = Math.min(255, 10000 / distSq);
               
               g.setColor(new Color(0, 0, 0, alpha));
               g.drawLine(c.x, c.y, t.x, t.y);
            }
         }
      }
   }
   
   public static void main(String[] a) {
      JFrame j = new JFrame();
      j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      j.add(new Draw());
      j.pack();
      Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
      j.setLocation(d.width / 2 - j.getWidth() / 2, d.height / 2 - j.getHeight() / 2);
      j.setVisible(true);
   }
   
   @Override
   public void mouseDragged(MouseEvent e) {
      history.add(new Point(e.getX(), e.getY(), true));
      repaint();
   }
   
   @Override
   public void mouseMoved(MouseEvent e) {
   }
   
   @Override
   public void mouseClicked(MouseEvent e) {
   }
   
   @Override
   public void mousePressed(MouseEvent e) {
      history.add(new Point(e.getX(), e.getY(), false));
      repaint();
   }
   
   @Override
   public void mouseReleased(MouseEvent e) {
   }
   
   @Override
   public void mouseEntered(MouseEvent e) {
   }
   
   @Override
   public void mouseExited(MouseEvent e) {
   }
   
   private static class Point {
      int x, y;
      boolean connected;
      
      Point(int x, int y, boolean c) {
         this.x = x;
         this.y = y;
         connected = c;
      }
   }
}





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