java - 如何在Java中的随机位置生成 Collection 品

我在使用Java的Android Studio中制作游戏。我遇到一个问题，我的收藏品在玩家将其收藏后仍保持在相同的位置重新生成。我希望它重新生成在屏幕上的随机位置。我怎样才能做到这一点？

收藏品是燃料罐。

这是油罐收藏类

Fuel.java

public class Fuel extends GameObject {

 public Fuel(Bitmap res, int w, int h, int numFrames) {
        x = GamePanel.WIDTH + 5000;
        y = GamePanel.HEIGHT / 2;
        dy =(random.nextInt()*(GamePanel.HEIGHT - (maxBorderHeight* 2)+maxBorderHeight));
        dx = +GamePanel.MOVESPEED;
        height = h;
        width = w;


        Bitmap[] image = new Bitmap[numFrames];
        spritesheet = res;

        for (int i = 0; i < image.length; i++)
        {
            image[i] = Bitmap.createBitmap(spritesheet, 0, i*height, width, height);
        }
        animation.setFrames(image);
        animation.setDelay(100-dx);
        animation.update();
    }

    public void update()
    {
        if (x < 0) {
            reset();
        }
        x += dx;
        dx = dx- 1;

        if (dx <= -15) {
            dx = -15;
        }

    animation.update();
    }

    public void draw(Canvas canvas)
    {
        try {
            canvas.drawBitmap(animation.getImage(),x,y,null);
        }catch (Exception e){}
    }

    public void reset(){
        x = GamePanel.WIDTH + 5000;
        y = GamePanel.HEIGHT/2 ;
        dy = (random.nextInt()*(GamePanel.HEIGHT - (maxBorderHeight* 2)+maxBorderHeight));
        dx = +GamePanel.MOVESPEED;

    }

    public void fuelCollected(){
    reset();
    }

}

GamePanel.java

public class GamePanel extends SurfaceView implements SurfaceHolder.Callback
{
  private Fuel fuel;

  @Override
  public void surfaceCreated(SurfaceHolder holder){
   fuel = new Fuel(BitmapFactory.decodeResource(getResources(), R.drawable.fuel),40,40,1);
  }

 public void update()
{
fuel.update();
        if(collectFuel(player,fuel)){
            distance +=100;
        }

public boolean collectFuel(GameObject player, GameObject fuel){
    if(Rect.intersects(player.getRectangle(),fuel.getRectangle()))
    {
        fuelCollected();
        return true;
    }
    return false;
}

public void fuelCollected(){fuel.fuelCollected();}
}
 @Override
public void draw(Canvas canvas){

// draw fuel can

        fuel.draw(canvas);
 }
}

最佳答案

将Fuel reset()方法更改为如下所示：

public void reset() {
        x = random.nextInt(GamePanel.WIDTH);
        y = random.nextInt(GamePanel.HEIGHT);
        dy = (random.nextInt()*(GamePanel.HEIGHT - (maxBorderHeight* 2)+maxBorderHeight));
        dx = +GamePanel.MOVESPEED;
    }

假设x, y是整数变量，x将是0和GamePanel.WIDTH之间的随机整数，而y是0和GamePanel.HEIGHT之间的随机整数。
为什么将5000添加到GamePanel.WIDTH？

关于java - 如何在Java中的随机位置生成 Collection 品，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42233783/