enemyplane.java

java 写的飞行射击游戏。是游戏的基础。可以参考一下。对游戏开发有帮助。

package airplane;

import java.awt.Image;
import java.applet.Applet;
import java.util.*;

public class EnemyPlane extends SuperSprite{

  int AppletWidth, AppletHeight;
  int startX, startY;
  int planeImgWidth, planeImgHeight;
  Random R;

  public EnemyPlane(Image planeImg,
                    int startX,
                    int startY,
                    Applet Game,
                    int AppletWidth,
                    int AppletHeight) {
    super(planeImg, startX, startY, Game); //调用父类的创建方法
    this.startX = startX;
    this.startY = startY;
    planeImgWidth = planeImg.getWidth(Game);
    planeImgHeight = planeImg.getHeight(Game);
    this.AppletWidth = AppletWidth;
    this.AppletHeight = AppletHeight;
    setVisible(true); //不可见
    setMove(true); //不可移动
  }

  public void updateState() { //更新敌人飞机Sprite的状态
    int t;
    t = Y;
    R = new Random();
    if (active == true) {
      if (X < -planeImgWidth) { //当敌人飞机穿过左边界时,重新从右开始
        do {
          Y = R.nextInt() % (AppletHeight - planeImgHeight);
        } while (Y <= 0 ||
                 Y >(AppletHeight - planeImgHeight) ||
                 java.lang.Math.abs(t-Y)<planeImgHeight);
        X = AppletWidth;
        setVisible(true);
      } else
        X = X - 5; //向左移动1像素
    }
  }
}