如何仅用两个键即左和右来控制蛇 [英] how to control snake with only two keys i.e left and right

问题描述

当前，我正在使用所有四个键来左右操纵蛇.我想知道如何只用左右键移动蛇.

currently, i'm using all four keys to steer the snake left, right, up and down. I'm wondering how can i only use left and right key to move the snake around.

                    if event.key == pygame.K_LEFT:
                        snake.direction = 2
                    elif event.key == pygame.K_RIGHT:
                        snake.direction = 3
                    elif event.key == pygame.K_UP:
                        snake.direction = 0
                    elif event.key == pygame.K_DOWN:
                        snake.direction = 1
    def move(self):
        if self.direction is 0:
            self.dy = -self.block
            self.dx = 0
        if self.direction is 1:
            self.dy = self.block
            self.dx = 0
        if self.direction is 2:
            self.dy = 0
            self.dx = -self.block
        if self.direction is 3:
            self.dy = 0
            self.dx = self.block
        self.x += self.dx
        self.y += self.dy

有人可以指导我该怎么做吗?

can anyone guide me how to do that?

推荐答案

定义方向如下:

• 0:向上移动
• 1:向右移动
• 2:下移
• 3:向右移动

def move(self):
    if self.direction is 0:
        self.dy = -self.block
        self.dx = 0
    if self.direction is 1:
        self.dy = 0
        self.dx = self.block
    if self.direction is 2:
        self.dy = 0
        self.dx = -self.block
    if self.direction is 3:
        self.dy = self.block
        self.dx = 0

    self.x += self.dx
    self.y += self.dy

当按 right 时，将1加到 snake.direction 上，当按 left 时，减去1.使用％(模)运算符(请参见二进制算术运算)以确保结果在[0，3]范围内:

When right is pressed then add 1 to snake.direction and when left is pressed the subtract 1. Use the % (modulo) operator (see Binary arithmetic operations) to ensure tha the result is in rage [0, 3]:

if event.key == pygame.K_LEFT:
    snake.direction = (snake.direction - 1) % 4
if event.key == pygame.K_RIGHT:
    snake.direction = (snake.direction + 1) % 4

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