proximity.java

无线传感器网络操作系统源代码

package net.tinyos.widgets;


import java.awt.*;
import java.awt.font.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.net.*;
import java.util.Timer;
import java.util.TimerTask;

public class Proximity extends JApplet implements Runnable {
    private Thread thread;
    private BufferedImage bimg;
    private double ss;
    private LinkedList my_packets;
    private static String level[] = {"0", "32","64","96","128","160","192","224","256"};

    public Proximity(LinkedList p) {
        setBackground(Color.white);  
	my_packets = p;
    }

    public void scaleSS(int ss_pkt) {
	ss =  (double)(ss_pkt-416)/256;
	System.out.println("Scaled signal strength = " + ss*256);
    }

    public void drawProximityWidget(int w, int h, Graphics2D g2) {
	
	g2.setStroke(new BasicStroke(5.0f));
	
	// Draw 8 lines
	for (int i=1; i<=8; i++) {
	    g2.draw(new Line2D.Double((double)w/10,((double)i/8.0)*h, w,((double)i/8.0)*h));
	    g2.drawString(level[8-i], (int)(w*0.03), (int)(((double)i/8.0)*h));
	}

	// draw graph
	Rectangle2D rect = new Rectangle2D.Double(0.3*w,h-ss*h,0.3*w,ss*h);
	//	rect.setColor(Color.red);
	g2.draw(rect);
	g2.setColor(Color.red);
	g2.fill(rect);
	g2.setColor(Color.black);
    }
    
    public void paint(Graphics g) {
        Dimension d = getSize();
        Graphics2D g2 = createGraphics2D(d.width, d.height);
        drawProximityWidget(d.width, d.height, g2);
        g2.dispose();
        g.drawImage(bimg, 0, 0, this);
    }
    
    
    public Graphics2D createGraphics2D(int w, int h) {
        Graphics2D g2 = null;
        if (bimg == null || bimg.getWidth() != w || bimg.getHeight() != h) {
            bimg = (BufferedImage) createImage(w, h);
        } 
        g2 = bimg.createGraphics();
        g2.setBackground(getBackground());
        g2.clearRect(0, 0, w, h);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        return g2;
    }

    public void start() {
        thread = new Thread(this);
        thread.setPriority(Thread.MIN_PRIORITY);
        thread.start();
    }


    public synchronized void stop() {
        thread = null;
    }
    
    public void run() {
	Thread me = Thread.currentThread();
	int timeout=0;
	ProximityTimer ptimer = null;
	Timer t = new Timer();

	while (thread == me) {
	    try {
		synchronized(my_packets) {
		    if (my_packets.size() != 0) {
			if (ptimer != null) ptimer.cancel();
			StringTokenizer str = new StringTokenizer(String.valueOf(my_packets.removeFirst()));
			scaleSS(Integer.valueOf(str.nextToken()).intValue());
			repaint();
			ptimer = new ProximityTimer();
			t.schedule(ptimer, 10*1000);
		    }
		}
	    } catch (Exception e){}
	    try {
		thread.sleep(1);
	    } catch (InterruptedException e) { break; }
	}
	thread = null;
    }

    class ProximityTimer extends TimerTask {
	public void run() {
	    scaleSS(0);
	    repaint();
	}
    }

}