shellsprite.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.*;

public class ShellSprite extends ImageSprite{
  int AppletWidth, AppletHeight;
  int shellWidth, shellHeight;
  int launchDirection;
  Image shellImg;
  Applet GameApplet;
  int speed;
  private int x,y;
  public ShellSprite(Image shellImg,
                     int launchDirection,
                     int speed,  //炮弹速度
                     Applet GameApplet) {
    super(0, 0); //调用父类的创建方法
    this.shellImg = shellImg;
    this.launchDirection = launchDirection;
    this.GameApplet = GameApplet;
    this.speed = speed;
    AppletWidth = 704;
    AppletHeight = 576;
    setVisible(false);
    setMove(false);

  }

  public void updateState(int launchDirection,
                          int TileWidth,
                          int TileHeight,
                          int mapCols){
    shellWidth = shellImg.getWidth(GameApplet);
    shellHeight = shellImg.getHeight(GameApplet);
    //System.out.println("X,Y"+X+","+Y);
    //移动炮弹
    switch (launchDirection) {
      case 0: //左

        if (X < (-shellWidth)){//设定炮弹的左边界
          setVisible(false); //设定炮弹Sprite为不可见
          setMove(false); //设定炮弹Sprite为不可移动
        }
        else{
           X = this.getX() - speed;
        }


        break;
      case 1: //右

        if (X > (AppletWidth + shellWidth)){ //设定炮弹的右边界
          setVisible(false); //设定炮弹Sprite为不可见
          setMove(false); //设定炮弹Sprite为不可移动
        }
        else{
           X = this.getX() + speed;
        }


        break;
      case 2: //上

        if (Y < (-shellHeight)){//设定炮弹的上边界
          setVisible(false); //设定炮弹Sprite为不可见
          setMove(false); //设定炮弹Sprite为不可移动
        }
        else{
          Y = this.getY() - speed;
        }

        break;
      case 3: //下
        if (Y > (AppletHeight + shellHeight)){//设定炮弹的下边界
          setVisible(false); //设定炮弹Sprite为不可见
          setMove(false); //设定炮弹Sprite为不可移动
        }
        else{
           Y = this.getY() + speed;
        }

        break;
    }
    //设定炮弹图像的最新位置
    this.setLocation(X, Y);
  }

  public int getShellDirection() {
    return launchDirection;
  }

  public void setShellDirection(int direction) {
    this.launchDirection = direction;
  }

  //覆盖父类方法
  public void paintSprite(Graphics g) { //绘制Sprite
    if (visible == true) {
      g.drawImage(shellImg, X, Y, Game);
    }
  }


}