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,  //炮彈速度
                     Applet GameApplet) {
    super(0, 0); //調用父類的創建方法
    this.shellImg = shellImg;
    this.launchDirection = launchDirection;
    this.GameApplet = GameApplet;
    this.speed = speed;
    AppletWidth = GameApplet.getWidth();
    AppletHeight = GameApplet.getHeight();
    setVisible(false);
    setMove(false);

  }

  public void updateState(){
    shellWidth = shellImg.getWidth(GameApplet);
    shellHeight = shellImg.getHeight(GameApplet);
    //System.out.println("X,Y"+X+","+Y);
    //移動炮彈
    switch (launchDirection) {
      case 0: //左
        if (X < (-shellWidth)){//設定炮彈的左邊界
          setVisible(false); //設定炮彈Sprite為不可見
          setMove(false); //設定炮彈Sprite為不可移動
        }
        else{
          X = this.getX() - speed;
        }
        break;
      case 1: //右
        if (X > (AppletWidth + shellWidth)){ //設定炮彈的右邊界
          setVisible(false); //設定炮彈Sprite為不可見
          setMove(false); //設定炮彈Sprite為不可移動
        }
        else{
          X = this.getX() + speed;
        }
        break;
      case 2: //上
        if (Y < (-shellHeight)){//設定炮彈的上邊界
          setVisible(false); //設定炮彈Sprite為不可見
          setMove(false); //設定炮彈Sprite為不可移動
        }
        else{
          Y = this.getY() - speed;
        }
        break;
      case 3: //下
        if (Y > (AppletHeight + shellHeight)){//設定炮彈的下邊界
          setVisible(false); //設定炮彈Sprite為不可見
          setMove(false); //設定炮彈Sprite為不可移動
        }
        else{
          Y = this.getY() + speed;
        }
        break;
    }
    //設定炮彈圖像的最新位置
    this.setLocation(X, Y);
  }

  public int getShellDirection() {
    return launchDirection;
  }

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

  //覆蓋父類方法
  public void paintSprite(Graphics g) { //繪制Sprite
    if (visible == true) {
      g.drawImage(shellImg, X, Y, Game);
    }
  }


}