如何限制 Pygame 角色的移动?

How to restrict movement of a Pygame character?

我正在 Pygame 中构建一个游戏,其中涉及使用箭头键移动红色矩形(玩家)。我已经让玩家使用箭头键移动(箭头键控制速度,回车键确认移动),但我需要能够限制玩家每回合能够移动的数量。我需要做的是让新的velocity/position最大只能是20pxup/down和20pxleft/right(20px就是按方向键两次)

目前,玩家根据箭头键设置的速度移动,但速度increases/decreases 与箭头键一起无限移动。一旦在任一方向最多按下箭头键 2 次(up/down、left/right),我需要它停止更改。

这里是控制速度的代码:

if event.type == pygame.KEYDOWN:
    if p1_turn:
        if event.key == pygame.K_RIGHT:
            p1_velocity_x += 10
        if event.key == pygame.K_LEFT:
                p1_velocity_x -= 10    

这里是确认更改的代码(实际移动玩家):

if event.key == pygame.K_RETURN:
    if p1_turn:
        p1.y += p1_velocity_y
        p1.x += p1_velocity_x
        p1_turn = False
        p2_turn = True

如前所述,应该有一些机制来阻止速度从原始 x 速度和原始 y 速度超过 20px increase/decrease。

只需使用if statements:

original_vel_x = 0

if p1_turn:
    if event.key == pygame.K_RIGHT:
        if p1_velocity_x <= original_vel_x + 20:  # I used <= in case it's being increased with floats
            p1_velocity_x += 10
        else: 
            print('Cannot Move')
import pygame

...


#Change those to whatever you want.
maximux_x = 20
minimum_x = 10

#This holds the players velocity on x.
p1_velocity_x = 0

def ChangeVelocity(change):
    global p1_velocity_x

    #cacl new x.
    new_x = p1_velocity_x + change


    if new_x < minimum_x:
        return

    if new_x > maximux_x:
        return

    #Change is inside the restrictions, so apply the change.
    p1_velocity_x += change

...



if event.type == pygame.KEYDOWN:

    if p1_turn:

        if event.key == pygame.K_RIGHT:
            ChangeVelocity(10)

        if event.key == pygame.K_LEFT:
            ChangeVelocity(-10)

为了更好地控制,您应该使用 类 创建精灵对象。示例如下:

import pygame


class Vector:

    def __init__(self, x, y):
        self.x = x
        self.y = y


class Player:

    def __init__(self):
        self.pos      = Vector(0,0)
        self.maxX     = 20
        self.maxY     = 10


    def MoveOnX(self, change):
        global p1_velocity_x

        #cacl new x.
        new_x = self.pos.x + change


        if new_x < self.maxX:
            return


        if new_x > self.maxY:
            return

        #Change is inside the restrictions, so apply the change.
        self.pos.x += change


#Create a new player and spawn him at (5,5)
player = Player()
player.pos.x = 5
player.pos.y = 5


if event.type == pygame.KEYDOWN:

    if p1_turn:

        if event.key == pygame.K_RIGHT:
            player.MoveOnX(10)

        if event.key == pygame.K_LEFT:
            player.MoveOnX(-10)