Java 为游戏移动对象

好的，我对编程比较陌生（只完成了一个学期的编程），我正在尝试创建我的太空入侵者游戏版本(http://www.aeonity.com/ab/games/arcade-classics/space-invaders.php). 我不想将其编程为小程序，我使用java中的StdDraw库来绘制所有内容

现在我已经画完了所有的东西，但是我对我的“宇宙飞船/敌人”的移动有问题。我已经知道如何移动一个敌人，但不能让他们一次移动全部

我认为我创造敌人的功能并没有那么强大，因为我必须自己写下每48个敌人的位置。。。我将让我的代码跟随，以便您可以查看。 提前谢谢

/** Draw Enemies*/
public class Enemy{
    //yr and xr positions for rectangle
    private double x1, y1, r1, w, h, xr, yr;
    private double x2, y2, r2, x3, y3, r3;
    public Enemy(double x, double y, double r, double width, double height, double xRec, double yRec,
    double xSec, double ySec, double rSec, double xThird, double yThird, double rThird)
    {x1 = x; y1 = y; r1 = r; w = width; h = height; xr = xRec; yr = yRec;
     x2 = xSec; y2 = ySec; r2 = rSec; x3 = xThird; y3 = yThird; r3 = rThird;}

public void DRAW_ENEMY(){
    StdDraw.setPenColor(StdDraw.PINK);
    StdDraw.filledCircle(x1, y1, r1);
    StdDraw.filledCircle(x2, y2, r2);
    StdDraw.filledCircle(x3, y3, r3);
    StdDraw.filledRectangle(xr, yr, w, h);
}
public void MOVE_ENEMY(Enemy e11, Enemy e12) {
    double vx = 0.005;

    while(true){
        if(e11.x2 > e12.x2 || e11.x1 < 0.004) {
            vx = -vx;
        }
        //Update position
        e11.x1 = e11.x1 + vx;
        e11.x2 = e11.x2 + vx;
        e11.x3 = e11.x3 + vx;
        e11.xr = e11.xr + vx;

        // clear the background
        StdDraw.setPenColor(StdDraw.BLACK);
        StdDraw.filledRectangle(0.5, 0.67, 0.6,0.18 );

        // draw ball on the screen
        StdDraw.setPenColor(StdDraw.PINK); 
        e11.DRAW_ENEMY();

        // display and pause for 20 ms
         StdDraw.show(80);
    }
}


//Test client
public static void main(String[] args){
    // create every object
    Enemy e11 = new  Enemy(0.10, 0.84, 0.01, 0.007, 0.022, 0.112, 0.82, 0.124, 0.84, 0.01, 0.112, 0.8, 0.009);
    e11.DRAW_ENEMY();
    Enemy e12 = new  Enemy(0.17, 0.84, 0.01, 0.007, 0.022, 0.182, 0.82, 0.194, 0.84, 0.01, 0.182, 0.8, 0.009);
    e12.DRAW_ENEMY();
    Enemy e13 = new  Enemy(0.24, 0.84, 0.01, 0.007, 0.022, 0.252, 0.82, 0.264, 0.84, 0.01, 0.252, 0.8, 0.009);
    e13.DRAW_ENEMY();
    Enemy e14 = new  Enemy(0.31, 0.84, 0.01, 0.007, 0.022, 0.322, 0.82, 0.334, 0.84, 0.01, 0.322, 0.8, 0.009);
    e14.DRAW_ENEMY();
    Enemy e15 = new  Enemy(0.38, 0.84, 0.01, 0.007, 0.022, 0.392, 0.82, 0.404, 0.84, 0.01, 0.392, 0.8, 0.009);
    e15.DRAW_ENEMY();
    Enemy e16 = new  Enemy(0.45, 0.84, 0.01, 0.007, 0.022, 0.462, 0.82, 0.474, 0.84, 0.01, 0.462, 0.8, 0.009);
    e16.DRAW_ENEMY();
    Enemy e17 = new  Enemy(0.52, 0.84, 0.01, 0.007, 0.022, 0.532, 0.82, 0.544, 0.84, 0.01, 0.532, 0.8, 0.009);
    e17.DRAW_ENEMY();
    Enemy e18 = new  Enemy(0.59, 0.84, 0.01, 0.007, 0.022, 0.602, 0.82, 0.614, 0.84, 0.01, 0.602, 0.8, 0.009);
    e18.DRAW_ENEMY();
    Enemy e19 = new  Enemy(0.66, 0.84, 0.01, 0.007, 0.022, 0.672, 0.82, 0.684, 0.84, 0.01, 0.672, 0.8, 0.009);
    e19.DRAW_ENEMY();
    Enemy e110 = new Enemy(0.73, 0.84, 0.01, 0.007, 0.022, 0.742, 0.82, 0.754, 0.84, 0.01, 0.742, 0.8, 0.009);
    e110.DRAW_ENEMY();
    Enemy e111 = new Enemy(0.80, 0.84, 0.01, 0.007, 0.022, 0.812, 0.82, 0.824, 0.84, 0.01, 0.812, 0.8, 0.009);
    e111.DRAW_ENEMY();
    Enemy e112 = new Enemy(0.87, 0.84, 0.01, 0.007, 0.022, 0.882, 0.82, 0.894, 0.84, 0.01, 0.882, 0.8, 0.009);
    e112.DRAW_ENEMY();

    Enemy e21 = new  Enemy(0.10, 0.74, 0.01, 0.007, 0.022, 0.112, 0.72, 0.124, 0.74, 0.01, 0.112, 0.7, 0.009);
    e21.DRAW_ENEMY();
    Enemy e22 = new  Enemy(0.17, 0.74, 0.01, 0.007, 0.022, 0.182, 0.72, 0.194, 0.74, 0.01, 0.182, 0.7, 0.009);
    e22.DRAW_ENEMY();
    Enemy e23 = new  Enemy(0.24, 0.74, 0.01, 0.007, 0.022, 0.252, 0.72, 0.264, 0.74, 0.01, 0.252, 0.7, 0.009);
    e23.DRAW_ENEMY();
    Enemy e24 = new  Enemy(0.31, 0.74, 0.01, 0.007, 0.022, 0.322, 0.72, 0.334, 0.74, 0.01, 0.322, 0.7, 0.009);
    e24.DRAW_ENEMY();
    Enemy e25 = new  Enemy(0.38, 0.74, 0.01, 0.007, 0.022, 0.392, 0.72, 0.404, 0.74, 0.01, 0.392, 0.7, 0.009);
    e25.DRAW_ENEMY();
    Enemy e26 = new  Enemy(0.45, 0.74, 0.01, 0.007, 0.022, 0.462, 0.72, 0.474, 0.74, 0.01, 0.462, 0.7, 0.009);
    e26.DRAW_ENEMY();
    Enemy e27 = new  Enemy(0.52, 0.74, 0.01, 0.007, 0.022, 0.532, 0.72, 0.544, 0.74, 0.01, 0.532, 0.7, 0.009);
    e27.DRAW_ENEMY();
    Enemy e28 = new  Enemy(0.59, 0.74, 0.01, 0.007, 0.022, 0.602, 0.72, 0.614, 0.74, 0.01, 0.602, 0.7, 0.009);
    e28.DRAW_ENEMY();
    Enemy e29 = new  Enemy(0.66, 0.74, 0.01, 0.007, 0.022, 0.672, 0.72, 0.684, 0.74, 0.01, 0.672, 0.7, 0.009);
    e29.DRAW_ENEMY();
    Enemy e210 = new Enemy(0.73, 0.74, 0.01, 0.007, 0.022, 0.742, 0.72, 0.754, 0.74, 0.01, 0.742, 0.7, 0.009);
    e210.DRAW_ENEMY();
    Enemy e211 = new Enemy(0.80, 0.74, 0.01, 0.007, 0.022, 0.812, 0.72, 0.824, 0.74, 0.01, 0.812, 0.7, 0.009);
    e211.DRAW_ENEMY();
    Enemy e212 = new Enemy(0.87, 0.74, 0.01, 0.007, 0.022, 0.882, 0.72, 0.894, 0.74, 0.01, 0.882, 0.7, 0.009);
    e212.DRAW_ENEMY();

    Enemy e31 = new  Enemy(0.10, 0.64, 0.01, 0.007, 0.022, 0.112, 0.62, 0.124, 0.64, 0.01, 0.112, 0.6, 0.009);
    e31.DRAW_ENEMY();
    Enemy e32 = new  Enemy(0.17, 0.64, 0.01, 0.007, 0.022, 0.182, 0.62, 0.194, 0.64, 0.01, 0.182, 0.6, 0.009);
    e32.DRAW_ENEMY();
    Enemy e33 = new  Enemy(0.24, 0.64, 0.01, 0.007, 0.022, 0.252, 0.62, 0.264, 0.64, 0.01, 0.252, 0.6, 0.009);
    e33.DRAW_ENEMY();
    Enemy e34 = new  Enemy(0.31, 0.64, 0.01, 0.007, 0.022, 0.322, 0.62, 0.334, 0.64, 0.01, 0.322, 0.6, 0.009);
    e34.DRAW_ENEMY();
    Enemy e35 = new  Enemy(0.38, 0.64, 0.01, 0.007, 0.022, 0.392, 0.62, 0.404, 0.64, 0.01, 0.392, 0.6, 0.009);
    e35.DRAW_ENEMY();
    Enemy e36 = new  Enemy(0.45, 0.64, 0.01, 0.007, 0.022, 0.462, 0.62, 0.474, 0.64, 0.01, 0.462, 0.6, 0.009);
    e36.DRAW_ENEMY();
    Enemy e37 = new  Enemy(0.52, 0.64, 0.01, 0.007, 0.022, 0.532, 0.62, 0.544, 0.64, 0.01, 0.532, 0.6, 0.009);
    e37.DRAW_ENEMY();
    Enemy e38 = new  Enemy(0.59, 0.64, 0.01, 0.007, 0.022, 0.602, 0.62, 0.614, 0.64, 0.01, 0.602, 0.6, 0.009);
    e38.DRAW_ENEMY();
    Enemy e39 = new  Enemy(0.66, 0.64, 0.01, 0.007, 0.022, 0.672, 0.62, 0.684, 0.64, 0.01, 0.672, 0.6, 0.009);
    e39.DRAW_ENEMY();
    Enemy e310 = new Enemy(0.73, 0.64, 0.01, 0.007, 0.022, 0.742, 0.62, 0.754, 0.64, 0.01, 0.742, 0.6, 0.009);
    e310.DRAW_ENEMY();
    Enemy e311 = new Enemy(0.80, 0.64, 0.01, 0.007, 0.022, 0.812, 0.62, 0.824, 0.64, 0.01, 0.812, 0.6, 0.009);
    e311.DRAW_ENEMY();
    Enemy e312 = new Enemy(0.87, 0.64, 0.01, 0.007, 0.022, 0.882, 0.62, 0.894, 0.64, 0.01, 0.882, 0.6, 0.009);
    e312.DRAW_ENEMY();

    Enemy e41 = new  Enemy(0.10, 0.54, 0.01, 0.007, 0.022, 0.112, 0.52, 0.124, 0.54, 0.01, 0.112, 0.5, 0.009);
    e41.DRAW_ENEMY();
    Enemy e42 = new  Enemy(0.17, 0.54, 0.01, 0.007, 0.022, 0.182, 0.52, 0.194, 0.54, 0.01, 0.182, 0.5, 0.009);
    e42.DRAW_ENEMY();
    Enemy e43 = new  Enemy(0.24, 0.54, 0.01, 0.007, 0.022, 0.252, 0.52, 0.264, 0.54, 0.01, 0.252, 0.5, 0.009);
    e43.DRAW_ENEMY();
    Enemy e44 = new  Enemy(0.31, 0.54, 0.01, 0.007, 0.022, 0.322, 0.52, 0.334, 0.54, 0.01, 0.322, 0.5, 0.009);
    e44.DRAW_ENEMY();
    Enemy e45 = new  Enemy(0.38, 0.54, 0.01, 0.007, 0.022, 0.392, 0.52, 0.404, 0.54, 0.01, 0.392, 0.5, 0.009);
    e45.DRAW_ENEMY();
    Enemy e46 = new  Enemy(0.45, 0.54, 0.01, 0.007, 0.022, 0.462, 0.52, 0.474, 0.54, 0.01, 0.462, 0.5, 0.009);
    e46.DRAW_ENEMY();
    Enemy e47 = new  Enemy(0.52, 0.54, 0.01, 0.007, 0.022, 0.532, 0.52, 0.544, 0.54, 0.01, 0.532, 0.5, 0.009);
    e47.DRAW_ENEMY();
    Enemy e48 = new  Enemy(0.59, 0.54, 0.01, 0.007, 0.022, 0.602, 0.52, 0.614, 0.54, 0.01, 0.602, 0.5, 0.009);
    e48.DRAW_ENEMY();
    Enemy e49 = new  Enemy(0.66, 0.54, 0.01, 0.007, 0.022, 0.672, 0.52, 0.684, 0.54, 0.01, 0.672, 0.5, 0.009);
    e49.DRAW_ENEMY();
    Enemy e410 = new Enemy(0.73, 0.54, 0.01, 0.007, 0.022, 0.742, 0.52, 0.754, 0.54, 0.01, 0.742, 0.5, 0.009);
    e410.DRAW_ENEMY();
    Enemy e411 = new Enemy(0.80, 0.54, 0.01, 0.007, 0.022, 0.812, 0.52, 0.824, 0.54, 0.01, 0.812, 0.5, 0.009);
    e411.DRAW_ENEMY();
    Enemy e412 = new Enemy(0.87, 0.54, 0.01, 0.007, 0.022, 0.882, 0.52, 0.894, 0.54, 0.01, 0.882, 0.5, 0.009);
    e412.DRAW_ENEMY();
    e11.MOVE_ENEMY(e11,e12);

}
}

/**吸引敌人*/
公敌{
//矩形的yr和xr位置
私人双x1，y1，r1，w，h，xr，yr；
专用双x2、y2、r2、x3、y3、r3；
公敌（双x，双y，双r，双宽，双高，双xRec，双yRec，
双xSec、双ySec、双rSec、双xThird、双yThird、双rThird）
{x1=x；y1=y；r1=r；w=宽度；h=高度；xr=xRec；yr=yRec；
x2=xSec；y2=ySec；r2=rSec；x3=xThird；y3=yThird；r3=rThird；}
公敌{
深蓝色（深粉色）；
标准填充圆（x1，y1，r1）；
标准填充圆（x2，y2，r2）；
标准填充圆（x3、y3、r3）；
StdDraw.filledRectangle（xr，yr，w，h）；
}
公共无效移动敌人（敌人e11，敌人e12）{
双vx=0.005；
while（true）{
如果（e11.x2>e12.x2 | | e11.x1<0.004）{
vx=-vx；
}
//更新位置
e11.x1=e11.x1+vx；
e11.x2=e11.x2+vx；
e11.x3=e11.x3+vx；
e11.xr=e11.xr+vx；
//清除背景
标准颜色（标准黑色）；
标准圆角转角（0.5,0.67,0.6,0.18）；
//在屏幕上画球
深蓝色（深粉色）；
e11.画出敌人（）；
//显示并暂停20毫秒
StdDraw.show（80）；
}
}
//测试客户端
公共静态void main（字符串[]args）{
//创建每个对象
敌人e11=新敌人（0.10,0.84,0.01,0.007,0.022,0.112,0.82,0.124,0.84,0.01,0.112,0.8,0.009）；
e11.画出敌人（）；
敌人e12=新敌人（0.17,0.84,0.01,0.007,0.022,0.182,0.82,0.194,0.84,0.01,0.182,0.8,0.009）；
e12.画出敌人（）；
敌人e13=新敌人（0.24,0.84,0.01,0.007,0.022,0.252,0.82,0.264,0.84,0.01,0.252,0.8,0.009）；
e13.画出敌人（）；
敌人e14=新敌人（0.31,0.84,0.01,0.007,0.022,0.322,0.82,0.334,0.84,0.01,0.322,0.8,0.009）；
e14.画出敌人（）；
敌人e15=新敌人（0.38,0.84,0.01,0.007,0.022,0.392,0.82,0.404,0.84,0.01,0.392,0.8,0.009）；
e15.画出敌人（）；
敌人e16=新敌人（0.45,0.84,0.01,0.007,0.022,0.462,0.82,0.474,0.84,0.01,0.462,0.8,0.009）；
e16.画出敌人（）；
敌人e17=新敌人（0.52,0.84,0.01,0.007,0.022,0.532,0.82,0.544,0.84,0.01,0.532,0.8,0.009）；
e17.画出敌人（）；
敌人e18=新敌人（0.59,0.84,0.01,0.007,0.022,0.602,0.82,0.614,0.84,0.01,0.602,0.8,0.009）；
e18.抽出敌人（）；
敌人e19=新敌人（0.66,0.84,0.01,0.007,0.022,0.672,0.82,0.684,0.84,0.01,0.672,0.8,0.009）；
e19.画出敌人（）；
敌人e110=新敌人（0.73,0.84,0.01,0.007,0.022,0.742,0.82,0.754,0.84,0.01,0.742,0.8,0.009）；
e110.抽出敌人（）；
敌人e111=新敌人（0.80,0.84,0.01,0.007,0.022,0.812,0.82,0.824,0.84,0.01,0.812,0.8,0.009）；
e111.画出敌人（）；
敌人e112=新敌人（0.87,0.84,0.01,0.007,0.022,0.882,0.82,0.894,0.84,0.01,0.882,0.8,0.009）；
e112.画出敌人（）；
敌人e21=新敌人（0.10,0.74,0.01,0.007,0.022,0.112,0.72,0.124,0.74,0.01,0.112,0.7,0.009）；
e21.抽出敌人（）；
敌人e22=新敌人（0.17,0.74,0.01,0.007,0.022,0.182,0.72,0.194,0.74,0.01,0.182,0.7,0.009）；
e22.抽出敌人（）；
敌人e23=新敌人（0.24,0.74,0.01,0.007,0.022,0.252,0.72,0.264,0.74,0.01,0.252,0.7,0.009）；
e23.抽出敌人（）；
敌人e24=新敌人（0.31,0.74,0.01,0.007,0.022,0.322,0.72,0.334,0.74,0.01,0.322,0.7,0.009）；
e24.抽出敌人（）；
敌人e25=新敌人（0.38,0.74,0.01,0.007,0.022,0.392,0.72,0.404,0.74,0.01,0.392,0.7,0.009）；
e25.抽出敌人（）；
敌人e26=新敌人（0.45,0.74,0.01,0.007,0.022,0.462,0.72,0.474,0.74,0.01,0.462,0.7,0.009）；
e26.抽出敌人（）；
敌人e27=新敌人（0.52,0.74,0.01,0.007,0.022,0.532,0.72,0.544,0.74,0.01,0.532,0.7,0.009）；
e27.抽出敌人（）；
敌人e28=新敌人（0.59,0.74,0.01,0.007,0.022,0.602,0.72,0.614,0.74,0.01,0.602,0.7,0.009）；
e28.抽出敌人（）；
敌人e29=新敌人（0.66,0.74,0.01,0.007,0.022,0.672,0.72,0.684,0.74,0.01,0.672,0.7,0.009）；
e29.抽出敌人（）；
敌人e210=新敌人（0.73,0.74,0.01,0.007,0.022,0.742,0.72,0.754,0.74,0.01,0.742,0.7,0.009）；
e210.抽出敌人（）；
敌人e211=新敌人（0.80,0.74,0.01,0.007,0.022,0.812,0.72,0.824,0.74,0.01,0.812,0.7,0.009）；
e211.抽出敌人（）；
敌人e212=新敌人（0.87,0.74,0.01,0.007,0.022,0.882,0.72,0.894,0.74,0.01,0.882,0.7,0.009）；
e212.抽出敌人（）；
敌人e31=新敌人（0.10,0.64,0.01,0.007,0.022,0.112,0.62,0.124,0.64,0.01,0.112,0.6,0.009）；
e31.画出敌人（）；
敌人e32=新敌人（0.17,0.64,0.01,0.007,0.022,0.182,0.62,0.194,0.64,0.01,0.182,0.6,0.009）；
e32.画出敌人（）；
敌人e33=新敌人（0.24,0.64,0.01,0.007,0.022,0.252,0.62,0.264,0.64,0.01,0.252,0.6,0.009）；
e33.画出敌人（）；
敌人e34=新敌人（0.31,0.64,0.01,0.007,0.022,0.322,0.62,0.334,0.64,0.01,0.322,0.6,0.009）；
e34.画出敌人（）；
敌人e35=新敌人（0.38,0.64,0.01,0.007,0.022，
List<Enemy> enemies = new ArrayList<Enemy>();

for(int y = 0; y < 4; y++) {
  for(int x = 0; x < 12; x++) {
    Enemy enemy = new Enemy(x,y); //all other variables can be coded in constructor
    enemies.add(enemy);
  }
}

for(Enemy e : enemies) {
  e.update(); //move a single enemy in the usual pattern ignoring his buddies
}

for(Enemy e : enemies) {
  e.draw();
}