将点随机放置在2D板上

Question

如何在基于2D的游戏中生成随机点（标记，石头......）？

标记是2D点阵列：Token[][] gameBoard;

玩家只是画画对象。它包含令牌的颜色：Paint bluePaint, redPaint;

初始化时，我可以手动在棋盘上手动放置令牌，如下所示（来自MainActivity的onCreate方法）：

bluePlayer = new Token(1,bluePaint, bgrBluePaint);
redPlayer = new Token(2, redPaint, bgrRedPaint);
gameBoard = new Token[100][100];

gameBoard[47][47]= redPlayer;
gameBoard[46][47]= bluePlayer;
gameBoard[44][48] = redPlayer; 
gameBoard[44][49]= redPlayer;
gameBoard[45][47]= redPlayer;
gameBoard[45][48]= bluePlayer;
gameBoard[45][49]= bluePlayer;
gameBoard[45][50]= redPlayer;
gameBoard[46][50]= bluePlayer;
gameBoard[46][49]= redPlayer;
gameBoard[46][48]= redPlayer;
gameBoard[47][50]= bluePlayer;
gameBoard[47][48]= bluePlayer;
gameBoard[47][49]= redPlayer;
gameBoard[48][50]= redPlayer;
gameBoard[48][49]= redPlayer;
gameBoard[48][48]= redPlayer;
gameBoard[49][50]= bluePlayer;
gameBoard[48][51]= redPlayer;

所以我的问题是，如何在给定的坐标范围内随机放置redPlayer和bluePlayer？我的意思是我希望它们随机放置在电路板中心周围的单元格中

class Token {

    private int _player;
    private Paint _paint, _bgrPaint;

    Token(int player, Paint paint, Paint bgrPaint) {
        _player = player;
        _paint = paint;
        _bgrPaint = bgrPaint;
    }

    Paint getPaint() {
        return _paint;
    }

    Paint get_bgrPaint() {
        return _bgrPaint;
    }

    int setPlayer(int _player, int _paint) {

        this._player = _paint;

        return _player;
    }

    int getPlayer() {
        return _player;
    }
}

以上是令牌类

Answer 1

你可以使用Random类：

import java.util.Random;

// ...

void generateTokens(int count) {
    Random random = new Random();
    boolean isRed = false;

    for (int i = 0; i < count; i++) {
        int x = random.nextInt(100);
        int y = random.nextInt(100);

        gameBoard[x][y] = isRed ? redPlayer : bluePlayer;
        isRed = !isRed;
    }
}

---

如果要将令牌的位置限制在板的中心周围，最直接的方法是限制上述函数分配的方块。该方法的问题在于中心的大小变小，您写入已经写入的图块的可能性更大。

相反，您可以预先生成包含令牌的所有切片的列表。然后，随机化列表，然后迭代它，将每个图块指定为红色或蓝色：

class Point { 
    public int X; 
    public int Y; 

    public Point(int x, int y) { 
        this.X = x; 
        this.Y = y;
    } 
}

// ...

void generateTokens(int centerRadius) {
    Random random = new Random();
    ArrayList<Point> positions = new ArrayList<>();

    for (int x = 49 - centerRadius; x <= 50 + centerRadius; x++) {
        for (int y = 49 - centerRadius; y <= 50 + centerRadius; y++) {
            postions.add(new Point(x, y));
        }
    }

    Collections.shuffle(positions);

    boolean isRed = true;

    for (int i = 0; i < positions.GetLength(); i++) {
      Point p = positions.get(i);
        gameBoard[p.X][p.Y] = isRed ? redPlayer : bluePlayer;
        isRed = !isRed;
    }
}

（我不在我可以测试此代码的地方，因此可能需要进行一些调整才能使其正常工作。）