import java.beans.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.plaf.LayerUI;
class WaitingLayerUI extends LayerUI<JComponent>
{
	private boolean isRunning;
	private Timer timer;
	private int angle;      
	public void paint(Graphics g, JComponent c)
	{
		super.paint(g, c);
		int w = c.getWidth();
		int h = c.getHeight();
		if (!isRunning)
			return;
		Graphics2D g2 = (Graphics2D)g.create();
		Composite urComposite = g2.getComposite();
		g2.setComposite(AlphaComposite.getInstance(
			AlphaComposite.SRC_OVER, .5f));
		g2.fillRect(0, 0, w, h);
		g2.setComposite(urComposite);
		int s = Math.min(w , h) / 5;
		int cx = w / 2;
		int cy = h / 2;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING
			, RenderingHints.VALUE_ANTIALIAS_ON);
		g2.setStroke( new BasicStroke(s / 2
			, BasicStroke.CAP_ROUND , BasicStroke.JOIN_ROUND));
		g2.setPaint(Color.BLUE);
		g2.rotate(Math.PI * angle / 180, cx, cy);
		for (int i = 0; i < 12; i++)
		{
			float scale = (11.0f - (float)i) / 11.0f;
			g2.drawLine(cx + s, cy, cx + s * 2, cy);
			g2.rotate(-Math.PI / 6, cx, cy);
			g2.setComposite(AlphaComposite.getInstance(
				AlphaComposite.SRC_OVER, scale));
		}
		g2.dispose();
	}
	public void start()
	{
		if (isRunning)
			return;
		isRunning = true;
		timer = new Timer(100, e -> {
			if (isRunning)
			{
				firePropertyChange("crazyitFlag", 0 , 1);
		
				angle += 6;      
				if (angle >= 360)
					angle = 0;
			}
		});
		timer.start();
	}
	public void stop()
	{
		isRunning = false;
		firePropertyChange("crazyitFlag", 0 , 1);
		timer.stop();
	}
	public void applyPropertyChange(PropertyChangeEvent pce
		, JLayer layer)
	{
		if (pce.getPropertyName().equals("crazyitFlag"))
		{
			layer.repaint();
		}
	}
}
public class WaitingJLayerTest
{
	public void init()
	{
		JFrame f = new JFrame("转动的“齿轮”");
		JPanel p = new JPanel();
		ButtonGroup group = new ButtonGroup();
		JRadioButton radioButton;
		p.add(radioButton = new JRadioButton("网购购买", true));
		group.add(radioButton);
		p.add(radioButton = new JRadioButton("书店购买"));
		group.add(radioButton);
		p.add(radioButton = new JRadioButton("图书馆借阅"));
		group.add(radioButton);
		p.add(new JCheckBox("疯狂Java讲义"));
		p.add(new JCheckBox("疯狂Android讲义"));
		p.add(new JCheckBox("疯狂Ajax讲义"));
		p.add(new JCheckBox("轻量级Java EE企业应用"));
		JButton orderButton = new JButton("投票");
		p.add(orderButton);
		final WaitingLayerUI layerUI = new WaitingLayerUI();
		JLayer<JComponent> layer = new JLayer<JComponent>(p, layerUI);
		final Timer stopper = new Timer(4000, ae -> layerUI.stop());
		stopper.setRepeats(false);
		orderButton.addActionListener(ae -> {
			layerUI.start();
			if (!stopper.isRunning())
			{
				stopper.start();
			}
		});
		f.add(layer);
		f.setSize(300, 170);
		f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
		f.setVisible (true);
	}
	public static void main(String[] args)
	{
		new WaitingJLayerTest().init();
	}
}