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Author: BurntPizza (posted 2014-08-03 02:57:17, viewed 116 times)

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import java.awt.*;
import java.beans.*;

import javax.swing.*;

@SuppressWarnings("serial")
public class Test extends JFrame {
   private JPanel panel = new JPanel();
   private final JLabel label1 = new JLabel("Label 1");
   private final JLabel label2 = new JLabel("Label 2");
   private Pendulum anim;
   
   private final Color[] colors = new Color[] { Color.green, Color.yellow };
   
   public static void main(String[] a) throws InterruptedException {
      new Test();
   }
   
   public Test() throws InterruptedException {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setSize(410, 300);
      setLocationRelativeTo(null);
      
      label1.setMinimumSize(new Dimension(100, 100));
      label1.setPreferredSize(new Dimension(100, 100));
      label1.setBackground(colors[1]);
      label1.setOpaque(true);
      
      label2.setMinimumSize(new Dimension(100, 100));
      label2.setPreferredSize(new Dimension(100, 100));
      label2.setBackground(colors[0]);
      label2.setOpaque(true);
      
      anim = new Pendulum();
      
      anim.addPropertyChangeListener("direction", new PropertyChangeListener() {
         @Override
         public void propertyChange(PropertyChangeEvent evt) {
            int i = evt.getNewValue().equals(Boolean.FALSE) ? 0 : 1;
            label1.setBackground(colors[i]);
         }
      });
      
      anim.addPropertyChangeListener("direction", new PropertyChangeListener() {
         @Override
         public void propertyChange(PropertyChangeEvent evt) {
            int i = evt.getNewValue().equals(Boolean.TRUE) ? 0 : 1;
            label2.setBackground(colors[i]);
         }
      });
      
      panel.setSize(new Dimension(400, 400));
      panel.add(label1);
      panel.add(label2);
      panel.add(anim);
      
      add(panel);
      setVisible(true);
      
      while (true) {
         anim.repaint();
         Thread.sleep(16);
      }
   }
}

@SuppressWarnings("serial")
class Pendulum extends JComponent {
   
   private Point pivot, ball;
   private int ballRadius, armLength;
   private double angle = -30;
   private boolean fallingLeft = true;
   
   {
      setSize(400, 300);
      setPreferredSize(getSize());
      setDoubleBuffered(true);
      
      pivot = new Point(400 / 2, 100 / 6);
      ball = new Point(); // will be calculated each frame
      ballRadius = 20;
      armLength = 80;
   }
   
   private void update() {
      angle += fallingLeft ? 1 : -1;
      
      if (Math.abs(angle) > 30) {
         fallingLeft = !fallingLeft;
         for (PropertyChangeListener l : getPropertyChangeListeners()) {
            l.propertyChange(new PropertyChangeEvent(this, "direction", Boolean.valueOf(!fallingLeft), Boolean.valueOf(fallingLeft)));
         }
      }
      
      double aRad = Math.toRadians(angle + 90); // +90 so that zero is straight down
      
      ball.x = (int) Math.round(pivot.x + armLength * Math.cos(aRad));
      ball.y = (int) Math.round(pivot.y + armLength * Math.sin(aRad));
   }
   
   @Override
   public void paintComponent(Graphics g) {
      update();
      g.clearRect(0, 0, getWidth(), getHeight());
      g.setColor(Color.black);
      g.drawLine(ball.x, ball.y, pivot.x, pivot.y);
      g.fillOval(ball.x - ballRadius, ball.y - ballRadius, ballRadius * 2, ballRadius * 2);
   }
}





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