railway.java

地图编程源码程序

//<applet code=Railway width=200 height=100>
//</applet>

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.URL;


public class Railway extends Applet implements Runnable, MouseListener,
        ItemListener, ActionListener {

    Thread thd = null, thd2;
    Image backGroundImage, playImage, playInImage, stopImage, stopInImage,
            signImage;
    Image offScreenImage = null;
    Graphics offScreenGraphics;
    Button buttonChangeSpeed, buttonStopSound;
    TextField textWhichSpeed;
    Label label1, label2;
    Choice choiceWhichTrain, choice2;
    AudioClip sound;
    MediaTracker tracker = new MediaTracker(this);
//界面中图形的位置
    int imgBackGroundTop = 0;
    int stopButtonLeft = 230; //暂停按钮左边距
    int playButtonLeft = 350;
    int imgButtonTop = 65;
    public final static int numOfTrain = 13; //列车数
    static Stations stations[] = new Stations[Stations.numOfStation];
    static Train trains[] = new Train[numOfTrain];
    public boolean trainPaused = false; //列车是否处于暂停状态
    public int trainToBeTraced = 0; //正在被跟踪的列车号
//方向常量
    public final static int ahead = 0; //沿着标注点的方向
    public final static int back = 1; //逆着标注点的方向
//public final static int EAST2WEST=1;  //在东西线上往西走
//public final static int NORTH2SOUTH=0; //在南北线上往南走
//定义地铁路线常量
    public final static int EW1 = 11; //乌鲁木齐-银川-呼和浩特
    public final static int EW2 = 12; //西宁-兰州-西安-洛阳-郑州
    public final static int EW3 = 13; //昆明-贵阳-长沙-南昌-金华-上海
    public final static int SN1 = 21; //银川-成都-昆明-南宁
    public final static int SN2 = 22; //北京-郑州-武汉-长沙-广州
    public final static int SN3 = 23; //哈尔滨-长春-沈阳-天津-济南-南京-上海
    public final static int SN = 33; //武汉-福州
//定义初始站常量
    public final int WLMQ[] = Lines.p00; //乌鲁木齐
    public final int HHHT[] = Lines.p20; //呼和浩特
    public final int XiNi[] = Lines.q00; //西宁
    public final int ZeZo[] = Lines.q40; //郑州
    public final int KuMi[] = Lines.r00; //昆明
    public final int ShHa[] = Lines.r50; //上海
    public final int YiCh[] = Lines.p10; //银川
    public final int NaNi[] = Lines.s30; //南宁
    public final int BeJi[] = Lines.t00; //北京
    public final int GuZh[] = Lines.t40; //广州
    public final int HEBi[] = Lines.u00; //哈尔滨
    public final int FuZh[] = Lines.v20; //福州

    public void init() {
//初始列车
        Train.nextID = 0; //必须加上这句，否则刷新浏览器时火车号会改变
        trains[0] = new Train(FuZh[0], FuZh[1], back, Color.red, SN); //福州始发
        trains[1] = new Train(WLMQ[0], WLMQ[1], ahead, Color.red, EW1); //乌鲁木齐始发
        trains[2] = new Train(HHHT[0], HHHT[1], back, Color.pink, EW1); //呼和浩特始发
        trains[3] = new Train(XiNi[0], XiNi[1], ahead, Color.red, EW2); //西宁始发
        trains[4] = new Train(ZeZo[0], ZeZo[1], back, Color.pink, EW2); //郑州始发
        trains[5] = new Train(KuMi[0], KuMi[1], ahead, Color.red, EW3); //昆明始发
        trains[6] = new Train(ShHa[0], ShHa[1], back, Color.pink, EW3); //上海始发
        trains[7] = new Train(YiCh[0], YiCh[1], ahead, Color.red, SN1); //银川始发
        trains[8] = new Train(NaNi[0], NaNi[1], back, Color.pink, SN1); //南宁始发
        trains[9] = new Train(BeJi[0], BeJi[1], ahead, Color.red, SN2); //北京始发
        trains[10] = new Train(GuZh[0], GuZh[1], back, Color.pink, SN2); //广州始发
        trains[11] = new Train(HEBi[0], HEBi[1], ahead, Color.red, SN3); //哈尔滨始发
        trains[12] = new Train(ShHa[0], ShHa[1], back, Color.pink, SN3); //上海始发
//初始车站
        Stations.initStation(stations);
        label1 = new Label("在状态栏显示列车的运行状况：");
        add(label1);
        choiceWhichTrain = new Choice();
        choiceWhichTrain.addItem("第0号列车");
        choiceWhichTrain.addItem("第1号列车");
        choiceWhichTrain.addItem("第2号列车");
        choiceWhichTrain.addItem("第3号列车");
        choiceWhichTrain.addItem("第4号列车");
        choiceWhichTrain.addItem("第5号列车");
        choiceWhichTrain.addItem("第6号列车");
        choiceWhichTrain.addItem("第7号列车");
        choiceWhichTrain.addItem("第8号列车");
        choiceWhichTrain.addItem("第9号列车");
        choiceWhichTrain.addItem("第10号列车");
        choiceWhichTrain.addItem("第11号列车");
        choiceWhichTrain.addItem("第12号列车");
        add(choiceWhichTrain);
        choiceWhichTrain.addItemListener(this);
        label2 = new Label("输入列车运行速度(3-10)：");
        add(label2);
        textWhichSpeed = new TextField("5", 2);
        add(textWhichSpeed);
        buttonChangeSpeed = new Button("改变速度");
        add(buttonChangeSpeed);
        buttonChangeSpeed.addActionListener(this);
        buttonStopSound = new Button("关闭声音");
        add(buttonStopSound);
        buttonStopSound.addActionListener(this);
        addMouseListener(this);
//声音
        sound = getAudioClip(getDocumentBase(), "sound.au");
//载入图像
        showStatus("Loading image...");
        backGroundImage = getImage(getDocumentBase(),"ChinaTrainMap.gif");
        tracker.addImage(backGroundImage, 0);
        stopImage = getImage(getDocumentBase(),"stop.GIF");
        tracker.addImage(stopImage, 0);
        stopInImage = getImage(getDocumentBase(), "stop.in.gif");
        tracker.addImage(stopInImage, 0);
        playImage = getImage(getDocumentBase(), "play.GIF");
        tracker.addImage(playImage, 0);
        playInImage = getImage(getDocumentBase(), "play.in.gif");
        tracker.addImage(playInImage, 0);
        offScreenImage = createImage(this.getSize().width,
                                     this.getSize().height);
//产生一个图形区域，不能放在paint中，否则将占用大量CPU
        waitLoadingImage();
        showStatus("Images has been loaded.");
        trains[0].color = Color.blue;
        sound.loop();
    }

    public void run() {
        while (true) {
//列车运行
            for (int i = 0; i < numOfTrain; i++) {
                trains[i].move();
            }
            //列车到站
            for (int i = 0; i < numOfTrain; i++) {
                trains[i].stop();
            }
            //状态栏显示
            showState();
            repaint();
            try {
                Thread.sleep(250);
            } catch (InterruptedException e) {
                break;
            }
        }
    }

    public void start() {
        thd = new Thread(this);
        thd.start();
    }

    public void stop() {
        thd.stop();
        thd = null;
    }

    public void destroy() {
        if (thd != null) {
            thd.stop();
            thd = null;
        }
    }

//利用双缓冲技术绘制图形
    public void paint(Graphics g) {
        offScreenGraphics = offScreenImage.getGraphics();
        offScreenGraphics.drawImage(backGroundImage, 0, 0, this); //这个语句可以进行清屏
        if (!trainPaused) {
            offScreenGraphics.drawImage(playInImage, playButtonLeft,
                                        imgButtonTop, this);
            offScreenGraphics.drawImage(stopImage, stopButtonLeft, imgButtonTop, this);
        }
        if (trainPaused) {
            offScreenGraphics.drawImage(playImage, playButtonLeft, imgButtonTop, this);
            offScreenGraphics.drawImage(stopInImage, stopButtonLeft,
                                        imgButtonTop, this);
        }
        for (int i = 0; i < numOfTrain; i++) {
            offScreenGraphics.setColor(trains[i].color);
            trains[i].paint(offScreenGraphics); //如果参数改成g将产生跳到}
            g.drawImage(offScreenImage, 0, 0, this);
        }
    }

    public void update(Graphics g) {
        paint(g);
    }

//状态栏显示
    public void showState() {
        if (trains[trainToBeTraced].isAtStation()) {
            int n = trains[trainToBeTraced].atWhichStation();
            showStatus("第" + String.valueOf(trainToBeTraced) + "号列车到达" +
                       stations[n].stationName + "站");
        } else {
            showStatus("第" + String.valueOf(trainToBeTraced) + "号列车在运行中...");
        }
    }

//等待图像装入后才继续运行
    public void waitLoadingImage() {
        try {
            tracker.waitForID(0);
        } catch (InterruptedException e) {
            return;
        }
    }

//处理选择控件，选择被跟踪的列车号
    public void itemStateChanged(ItemEvent e) {
        int tempNum;
        tempNum = trainToBeTraced;
        trainToBeTraced = choiceWhichTrain.getSelectedIndex();
        trains[tempNum].color = trains[trainToBeTraced].color;
        trains[trainToBeTraced].color = Color.blue;
    }

//处理按钮控件，改变运行速度和声音
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == buttonChangeSpeed) {
            int input;
            input = Integer.parseInt(textWhichSpeed.getText());
            if (input < 3) {
                input = 2;
                textWhichSpeed.setText("3");
            }
            if(input>10){input=10;textWhichSpeed.setText("10");}
            for (int i = 0; i < numOfTrain; i++) {
                trains[i].speed = input;
            }
        }
        if (e.getSource() == buttonStopSound) {
            if (buttonStopSound.getLabel() == "关闭声音") {
                sound.stop();
                buttonStopSound.setLabel("打开声音");     }
           else {
                sound.loop();
                buttonStopSound.setLabel("关闭声音");     }
            
        }
    }

//处理鼠标事件，暂停或继续列车的运行
    public void mousePressed(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();
        int width = playImage.getWidth(this);
        int height = playImage.getHeight(this);
//按下暂停按钮
        if ((imgButtonTop <= y) && (y <= imgButtonTop + height) &&
            (stopButtonLeft <= x) && (x <= stopButtonLeft + width) &&
            (!trainPaused)) {
            thd.suspend();
            sound.stop();
            trainPaused = true;
            repaint();
        }
//按下运行按钮
        if ((imgButtonTop <= y) && (y <= imgButtonTop + height) &&
            (playButtonLeft <= x) && (x <= playButtonLeft + width) &&
            (trainPaused)) {
            thd.resume();
            trainPaused = false;
            repaint();
            if (buttonStopSound.getLabel() == "关闭声音") 
                sound.loop();
            else 
                sound.stop();
            
        }
    }

    public void mouseEntered(MouseEvent e) {}

    public void mouseExited(MouseEvent e) {}

    public void mouseReleased(MouseEvent e) {}

    public void mouseClicked(MouseEvent e) {}

}

//文件名：Train.java
class Train extends Panel {
    Lines lines = new Lines();
    int positionX, positionY; //列车坐标
    private int width, height; //列车宽和高
    int direction; //方向
    int speed = 0; //速度
    boolean isMoving; //是否正在运行
    int hasPausedTime = 0; //已经停靠站的时间
    public final static int shouldPausedTime = 3; //应停靠站的时间
    Color color; //车的颜色
    int trainID = 0; //列车号
    int onWhichLine; //在哪条铁路线上
    int nextPoint; //沿标注点方向，下一个铁路标注点序号（火车在最末标注点时，该值为最末标注点序号）
    public static int nextID = 0;
    Train() {
        this.width = 10; //车的宽和高均为10个像素
        this.height = 10;
        this.speed = 5; //每次移动5个像素
        this.isMoving = true;
        this.trainID = nextID++; //初始化一个车，车号加1
    }

    Train(int x, int y, int direction) {
        this();
        this.positionX = x;
        this.positionY = y;
        this.direction = direction;
    }

    Train(int x, int y, int direction, Color c) {
        this(x, y, direction);
        this.color = c;
    }

    Train(int x, int y, int direction, Color c, int onWhichLine) {
        this(x, y, direction, c);
        this.onWhichLine = onWhichLine;
    }

    public void setTrain(int x, int y, int direction) {
        this.positionX = x;
        this.positionY = y;
        this.direction = direction;
    }

    public void reverseDirection() {
        switch (direction) {
        case 0:
            direction = 1;
            break;
        case 1:
            direction = 0;
            break;
        }
    }

//改变火车方向
    public void changeDirection() {
        int pointNum = lines.getPointNum(onWhichLine);
        if ((nextPoint >= pointNum) || (nextPoint <= 0)) 
            reverseDirection(); //注意：pointNum要比点数大1
      
    }

//列车是否在站
    public boolean isAtStation() {
        for (int i = 0; i < Stations.numOfStation; i++) {
            if (positionX == Railway.stations[i].x &&
                positionY == Railway.stations[i].y) 
                return true;
           
        }
        return false;
    }