playtanksprite.java

1) 在实践中理解游戏地图的含义 2) 地图的编辑制作 3) 地图数据的运用 4) 地图的碰撞检测

package tankgame611;
import java.applet.Applet;
import java.awt.Image;
import java.awt.event.*;

public class PlayTankSprite extends SpriteDrawing{
  int AppletWidth, AppletHeight;
  int myTankWidth, myTankHeight;
  int direction;
  int myTankX, myTankY;
  Image myTankImg[];
  Applet GameApplet;
  static int speed = 5;
  ShellSprite shell;
  boolean keyIsReleased = false;   //是否按键不放
  public final int TO_LEFT=0;
  public final int TO_RIGHT=1;
  public final int TO_UP=2;
  public final int TO_DOWN=3;

  public PlayTankSprite(Image[] myTankImg,
                          int myTankStartX,
                          int myTankStartY,
                          ShellSprite shell,  //炮弹的实例
                          Applet GameApplet) {
    //调用父类的创建方法
    super(myTankImg, myTankStartX, myTankStartY, GameApplet);
    this.X = myTankStartX;
    this.Y = myTankStartY;
    this.myTankImg = myTankImg;
    this.shell = shell;
    this.GameApplet = GameApplet;
    AppletWidth = GameApplet.getWidth();
    AppletHeight = GameApplet.getHeight();
    direction = TO_UP;
    setVisible(true);
    setMove(false);
    //为Applet加上键盘事件侦听
    GameApplet.addKeyListener(new keyAction());
  }

  //SpiritDirection : 0=左; 1=右; 2=上; 3=下;
  public void updateState(int SpiritDirection) {
    myTankWidth=myTankImg[0].getWidth(GameApplet);
    myTankHeight=myTankImg[0].getHeight(GameApplet);
    //移动坦克
    switch (SpiritDirection) {
      case TO_LEFT: //左
        this.X=this.getX()-speed;
        if(this.X<=1){
          this.X=1;
        }
        if(this.isCollide(TankGame611.TILE_WIDTH,TankGame611.TILE_HEIGHT,TankGame611.MAP_COLS,SpiritDirection)){
          this.X=this.getCollisionX();
        }
        break;
      case TO_RIGHT: //右
       this.X=this.getX()+speed;
       if(this.X>=AppletWidth-DrawGameState.StatusBarWidth-myTankWidth-1){
         this.X=AppletWidth-DrawGameState.StatusBarWidth-myTankWidth-1;
       }
       if(this.isCollide(TankGame611.TILE_WIDTH,TankGame611.TILE_HEIGHT,TankGame611.MAP_COLS,SpiritDirection)){
         this.X=this.getCollisionX();
       }
        break;
      case TO_UP: //上
        this.Y=this.getY()-speed;
        if(this.Y<=1){
          this.Y=1;
        }
        if(this.isCollide(TankGame611.TILE_WIDTH,TankGame611.TILE_HEIGHT,TankGame611.MAP_COLS,SpiritDirection)){
          this.Y=this.getCollisionY();
        }

        break;
      case TO_DOWN: //下
        this.Y=this.getY()+speed;
        if(this.Y>=AppletHeight-myTankHeight-1){
          this.Y=AppletHeight-myTankHeight-1;
        }
        if(this.isCollide(TankGame611.TILE_WIDTH,TankGame611.TILE_HEIGHT,TankGame611.MAP_COLS,SpiritDirection)){
          this.Y=this.getCollisionY();
        }

        break;
    }
  }

  public int getTankDirection(){
    return direction;
  }

  //调整炮弹的位置
  public void setShellPos(int direction) {
    switch (direction) {
      case TO_LEFT: //左
        shell.setLocation(this.X - shell.getWidth(),
                             this.Y + (myTankHeight - shell.getHeight()) / 2);
        break;
      case TO_RIGHT:
        shell.setLocation(this.X + myTankWidth + shell.getWidth(),
                             this.Y + (myTankHeight - shell.getHeight()) / 2);
        break;
      case TO_UP:
        shell.setLocation(this.X + (myTankHeight - shell.getHeight()) / 2,
                             this.Y - myTankWidth / 2);
        break;
      case TO_DOWN:
        shell.setLocation(this.X + (myTankHeight - shell.getHeight()) / 2,
                             this.Y + myTankWidth);
        break;
    }
  }

  //使用内部类实现按键事件处理
  class keyAction extends KeyAdapter {
    long startTime, endTime;
    public void keyPressed(KeyEvent e) {
      startTime = System.currentTimeMillis();
      myTankWidth = myTankImg[0].getWidth(GameApplet);
      myTankHeight = myTankImg[0].getHeight(GameApplet);
      if (e.getKeyCode() == e.VK_SPACE) { //发射炮弹的处理
        if (keyIsReleased == true) { //释放了键（防止长按键不放）
          shell.setShellDirection(direction);
          setShellPos(direction);
          shell.setVisible(true);
          shell.setMove(true);
          keyIsReleased = false; //未释放了键
        }
      }
      if (e.getKeyCode() == e.VK_LEFT) {
        direction = TO_LEFT;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_RIGHT) {
        direction = TO_RIGHT;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_UP) {
        direction = TO_UP;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_DOWN) {
        direction = TO_DOWN;
        setMove(true);
      }
    }
    public void keyReleased(KeyEvent e) {
      endTime = System.currentTimeMillis();
      if(endTime-startTime>40){  //防止快速按键切换带来的短暂停顿
        setMove(false);
      }
      keyIsReleased = true;  //释放了键
    }
  }


}