playertanksprite.java

全面运用所学的JAVA理论对所设计的类进一步完善

package tankgame2007;

import java.applet.Applet;
import java.awt.Image;
import java.awt.event.*;
import java.awt.*;
public class PlayerTankSprite extends ImageSprite{
  int AppletWidth, AppletHeight;
  int myTankWidth, myTankHeight;
  int direction;
  int myTankX, myTankY;
  Image myTankImg[];
  Applet GameApplet;
  static int speed = 5;
  ShellSprite shell;
  int nowFrame;
  boolean keyIsReleased = false;   //是否按键不放

  public PlayerTankSprite(Image[] myTankImg,
                          int myTankX,
                          int myTankY,
                          ShellSprite shell,  //炮弹的实例
                          Applet GameApplet) {
    //调用父类的创建方法
    super(myTankImg, myTankX, myTankY, GameApplet);
    this.myTankX = myTankX;
    this.myTankY = myTankY;
    this.myTankImg = myTankImg;
    this.shell = shell;
    this.GameApplet = GameApplet;
    AppletWidth =GameApplet.getWidth() ;
    AppletHeight =GameApplet.getHeight();
    direction = 2;
    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 moveDirection,
                          int TileWidth,
                          int TileHeight,
                          int mapCols){
    AppletWidth = 704;
    AppletHeight = GameApplet.getHeight();
    int x, y;
    switch (moveDirection) {
      case 0: //往左
        nowFrame = 0;

        this.X = this.X - speed;
        if (this.X <= 0) {
          this.X = 1;
        }
        isCollide(TileWidth, TileHeight,
                           mapCols, moveDirection);
        if(this.isCollide(TileWidth, TileHeight,
                           mapCols, moveDirection)) {

           this.X = this.getCollisionX();
        }
        break;
      case 1: //往右
        nowFrame = 1;
        this.X = this.X + speed;
        if (this.X >= AppletWidth - this.getWidth()) {
          this.X = AppletWidth - this.getWidth()-1;
        }
        if (this.isCollide(TileWidth, TileHeight,
                                mapCols, moveDirection)) {
          this.X = this.getCollisionX();
        }
        break;
      case 2: //往上
        nowFrame = 2;
        this.Y = this.Y - speed;
        if (this.Y <= 0) {
          this.Y = 1;
        }
        if (this.isCollide(TileWidth, TileHeight,
                           mapCols, moveDirection)) {
         this.Y = this.getCollisionY();
        }
        break;
      case 3: //往下
        nowFrame = 3;
        this.Y = this.Y + speed;
        if (this.Y >= AppletHeight - this.getHeight()) {
          this.Y = AppletHeight - this.getHeight()-1;
        }

        if (this.isCollide(TileWidth, TileHeight,
                           mapCols, moveDirection)) {
          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 0: //左
        shell.setLocation(this.X - shell.getWidth(),
                          this.Y + (this.getHeight() -
                          shell.getHeight()) / 2);
        break;
      case 1:
        shell.setLocation(this.X + this.getWidth() + shell.getWidth(),
                            this.Y +
                             (this.getWidth() -
                              shell.getHeight()) / 2);
        break;
      case 2:
        shell.setLocation(this.X +
                             (this.getHeight() - shell.getHeight()) / 2,
                             this.Y - this.getWidth() / 2);
        break;
      case 3:
        shell.setLocation(this.X +
                             (this.getHeight() - shell.getHeight()) / 2,
                             this.Y + this.getWidth());
        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
        System.out.println(keyIsReleased);
        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 = 0;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_RIGHT) {
        direction = 1;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_UP) {
        direction = 2;
        setMove(true);
      }
      if (e.getKeyCode() == e.VK_DOWN) {
        direction = 3;
        setMove(true);
      }
    }
    public void keyReleased(KeyEvent e) {
      endTime = System.currentTimeMillis();
      if(endTime-startTime>60){  //防止快速按键切换带来的短暂停顿
        setMove(false);
      }
      keyIsReleased = true;  //释放了键
    }
  }


}