package _2048;

import java.awt.Point;
import java.util.ArrayList;
import java.util.Random;

/**
 * 用来随机出现图片的类
 * 
 * @author zzc
 * 
 */
public class Randompic {
	Random r;
	ArrayList<Point> list = new ArrayList<Point>();

	public Randompic() {
		r = new Random();
	}

	// 根据传入数组 为arr添加项
	public void Found(int arr[][]) {
		// 先清空数组
		list.removeAll(list);
		for (int i = 0; i < arr.length; i++)
			for (int j = 0; j < arr[i].length; j++) {
				if (arr[i][j] == -1) {
					Point p = new Point(i, j);
					list.add(p);
				}
			}
	}

	// 随机一个坐标 返回point
	public Point random() {
		if (list.size() > 0) {
			int n = r.nextInt(list.size());
			return list.get(n);
		} else
			return new Point(-1, -1);

	}

	// 随机一个数字 2或4
	public int randomInt() {
		int n = r.nextInt(12);
		if (n % 5 == 0)
			return 4;
		else
			return 2;
	}
}