bullet.java

j2me 小的子弹精灵,简单介绍sprite 的一个例子

package spritebullet;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import java.util.*;

public class Bullet {
  private Sprite bullet;
  private Vector bs = new Vector();
   Image img = null;
  public Bullet() {
    try {
      img = Image.createImage("/res/bullet.png");
    }
    catch (Exception e) {}
  }
  //加入子弹
  public void addBullet(int x,int y,int width){
    bullet = new Sprite(img, 8, 8);
    bullet.setPosition(x - bullet.getWidth() / 2 + width / 2, y);
    bs.addElement(bullet);
  }

//移动子弹删除子弹
  public void Move() {
    for (int i = 0; i < bs.size(); i++) {
      Sprite b = (Sprite)bs.elementAt(i);
      b.move(0, -3);
      if (b.getY() < 0) {
        bs.removeElementAt(i);
      }
    }
  }
 //画子弹
  public void DrawSelf(Graphics g) {
    for (int i = 0; i < bs.size(); i++) {
      Sprite but = (Sprite) bs.elementAt(i);
      but.paint(g);
    }
  }

}