test20fans.java

这是一个 风扇程序,操作简单,图形化,共有3个,风扇可以反转.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.geom.*;

public class Test20Fans
{
	public static void main(String[] args)
	{
		FanFrame frame=new FanFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
}

class FanFrame extends JFrame
{
	private JPanel controlPanel=new JPanel();
	private JButton startallButton=new JButton("全部开始"); //创建全部开始按扭
    private JButton stopallButton=new JButton("全部结束");  //创建全部结束按扭
    private FanPanel first=new FanPanel();
    private FanPanel second=new FanPanel();
    private FanPanel third=new FanPanel();
    public FanFrame()
	{
		setTitle("风扇");
		setSize(680,310);
		controlPanel.add(startallButton);
		controlPanel.add(stopallButton);
		controlPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
		add(controlPanel,"South");

		add(first,"East");
		add(second,"West");
		add(third,"Center");

		StartAllListener li1=new StartAllListener();
		startallButton.addActionListener(li1);
		StopAllListener li2=new StopAllListener();
		stopallButton.addActionListener(li2);
	}
	class StartAllListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
	    {
			first.GetSignal(1);
			second.GetSignal(1);
			third.GetSignal(1);
	    }
    }
	class StopAllListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
	    {
			first.GetSignal(0);
			second.GetSignal(0);
			third.GetSignal(0);
	    }
    }
}

class FanPanel extends JPanel
{
	Timer timer1=new Timer(30,new StartListener());
	Timer timer3=new Timer(30,new ReverseListener());
	private int i,j;
	private int choose=0;

	public void GetSignal(int s)
	{
		if(s==1)
		{
			timer1.start();
		}
		else
		{
			timer1.stop();
			timer3.stop();
		}
	}

	public FanPanel()
	{
		JButton startButton = new JButton("开始");//创建开始按扭
		JButton stopButton = new JButton("结束");//创建结束按扭
		JButton reverseButton = new JButton("Reverse");//创建反转按扭
		add(startButton);
		add(stopButton);
		add(reverseButton);

		StartListener l1=new StartListener();
		startButton.addActionListener(l1);

		StopListener l2=new StopListener();
		stopButton.addActionListener(l2);

		ReverseListener l3=new ReverseListener();
		reverseButton.addActionListener(l3);
	}

	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Graphics2D g2=(Graphics2D) g;
		double xCenter=getWidth()/2;       //中心点x
		double yCenter=getHeight()/2;     //中心点y
		double radius=(int)(getWidth()*0.3);    //半径
		double x=xCenter-radius;             //左上角x
      	double y=yCenter-radius+20;        //左上角y
      	Ellipse2D ellipse1 = new Ellipse2D.Double(x-5,y-5,2*radius+10,2*radius+10);
      	g2.draw(ellipse1);
      	Arc2D arc1=new Arc2D.Double(x,y,2*radius,2*radius,0-j,30,Arc2D.PIE);
       	g2.fill(arc1);
       	Arc2D arc2=new Arc2D.Double(x,y,2*radius,2*radius,90-j,30,Arc2D.PIE);
       	g2.fill(arc2);
       	Arc2D arc3=new Arc2D.Double(x,y,2*radius,2*radius,180-j,30,Arc2D.PIE);
		g2.fill(arc3);
		Arc2D arc4=new Arc2D.Double(x,y,2*radius,2*radius,270-j,30,Arc2D.PIE);
       	g2.fill(arc4);
       	g2.setPaint(Color.GREEN); //风扇的颜色
       	g2.fill(arc1);
       	g2.fill(arc2);
       	g2.fill(arc3);
       	g2.fill(arc4);
	}

	class StartListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
	    {
       		timer3.stop();
       		timer1.start();
		    i+=20;                      //i值确定转速大小
		    j=i%360;
		    repaint();
	    }
    }

    class StopListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
	    {
       		timer1.stop();
			timer3.stop();
			repaint();
	    }
    }

    class ReverseListener implements ActionListener
	{
	    public void actionPerformed(ActionEvent event)
	    {
	        timer1.stop();
	        timer3.start();
	        i-=20;     //i的值决定反向的转速
	        j=i%360;
	        repaint();
	    }
    }
}