俄罗斯方块小游戏是当年风靡一时的小游戏，该游戏由一个棋盘组成，该棋盘跨度为10个单元格，高度为20个单元格，如下所示。

俄罗斯方块小游戏

关于此小游戏的规则，我们不再介绍，本期文章主要用代码来实现，我们知道俄罗斯方块小游戏主要有如下7个方块组成，我们在代码中使用字母“ O”，“ I”，“ S”，“ Z”，“ L”，“ J”和“ T”表示它们。

俄罗斯方块

使用OpenCV和python创建俄罗斯方块

import cv2
import numpy as np
from random import choice
SPEED = 1 #控制速度
board = np.uint8(np.zeros([20, 10, 3]))
quit = False
place = False
drop = False
switch = False
held_piece = ""
flag = 0
score = 0

首先我们导入需要的第三方库以及定义好需要的变量

# 所有方块造型
next_piece = choice(["O", "I", "S", "Z", "L", "J", "T"])
def get_info(piece):
    if piece == "I":
        coords = np.array([[0, 3], [0, 4], [0, 5], [0, 6]])
        color = [255, 155, 15]
    elif piece == "T":
        coords = np.array([[1, 3], [1, 4], [1, 5], [0, 4]])
        color = [138, 41, 175]
    elif piece == "L":
        coords = np.array([[1, 3], [1, 4], [1, 5], [0, 5]])
        color = [2, 91, 227]
    elif piece == "J":
        coords = np.array([[1, 3], [1, 4], [1, 5], [0, 3]])
        color = [198, 65, 33]
    elif piece == "S":
        coords = np.array([[1, 5], [1, 4], [0, 3], [0, 4]])
        color = [55, 15, 215]
    elif piece == "Z":
        coords = np.array([[1, 3], [1, 4], [0, 4], [0, 5]])
        color = [1, 177, 89]
    else:
        coords = np.array([[0, 4], [0, 5], [1, 4], [1, 5]])
        color = [2, 159, 227]
    return coords, color

然后我们建立7个俄罗斯方块的造型与颜色，以上建立完成后，我们需要搭建一个游戏界面以及鼠标控制事件

def display(board, coords, color, next_info, held_info, score, SPEED):
    border = np.uint8(127 - np.zeros([20, 1, 3]))
    border_ = np.uint8(127 - np.zeros([1, 34, 3]))
    dummy = board.copy()
    dummy[coords[:,0], coords[:,1]] = color
    right = np.uint8(np.zeros([20, 10, 3]))
    right[next_info[0][:,0]   2, next_info[0][:,1]] = next_info[1]
    left = np.uint8(np.zeros([20, 10, 3]))
    left[held_info[0][:,0]   2, held_info[0][:,1]] = held_info[1]
    dummy = np.concatenate((border, left, border, dummy, border, right, border), 1)
    dummy = np.concatenate((border_, dummy, border_), 0)
    dummy = dummy.repeat(20, 0).repeat(20, 1)
    dummy = cv2.putText(dummy, str(score), (520, 200), cv2.FONT_HERSHEY_DUPLEX, 1, [0, 0, 255], 2)
# 控制键
    dummy = cv2.putText(dummy, "A - move left", (45, 200), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "D - move right", (45, 225), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "S - move down", (45, 250), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "W - hard drop", (45, 275), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "J - rotate left", (45, 300), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "L - rotate right", (45, 325), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    dummy = cv2.putText(dummy, "I - hold", (45, 350), cv2.FONT_HERSHEY_DUPLEX, 0.6, [0, 0, 255])
    cv2.imshow("Tetris", dummy)
    key = cv2.waitKey(int(1000/SPEED))
    return key

游戏界面

搭建的游戏界面如上，我们在界面左边显示每个鼠标按键的功能，中间是主游戏区域，最右边为积分区域

以上建立完成后，我们开始主函数的部分

我们有一个while循环，在每次迭代中，我们都会在游戏中放置一个新棋子。

在俄罗斯方块中，我们可以按某个键来固定一块。通过与当前方块交换，可以保留将来使用的一种方块。

在下面的代码中，我们首先检查用户是否要使用switch变量将当前方块与保留的方块交换。如果switch变量设置为false，我们将分配current_piece，next_piece并随机选择一个new next_piece

if __name__ == "__main__":
    while not quit:   
        if switch:
            held_piece, current_piece = current_piece, held_piece
            switch = False
        else:
            current_piece = next_piece
            next_piece = choice(["I", "T", "L", "J", "Z", "S", "O"])·			

        if flag