如何在pygame中水平翻转图像? [英] How do I flip an image horizontally in pygame?

问题描述

这是在pygame中.我如何翻转图像(让我们说一个 猪向右看) 我按向左箭头键，然后像这样停留 即使我不按任何键或按向上和向下箭头键.然后，当我按向右箭头键时，即使不按任何键或按向上和向下箭头键，也要再次将其切换回右侧，以保持原来的状态.

This is in pygame. How do I flip an image (lets say an image of a pig looking to the right) to look to the left when I press the left arrow key, and stay like that even if I don't press any keys or if I press the up and down arrow keys. Then how do I switch it back again to look to the right when I press the right arrow key and make it stay like that even if I don't press any key or if I press the up and down arrow keys.

我知道我必须使用 pygame.transform.flip().但是，我不知道如何将其放入代码中.

I know I have to use pygame.transform.flip(). But, I don't know how to put it in my code.

这是主要游戏:

import sys

import pygame

from pig import Pig

pygame.init()

screen_width = 800
screen_height = 600

screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Flying Pig")

blue_sky = 135, 206, 250
brown = 139, 69, 19

pig = Pig(screen)

while True:

    # Accept events
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

        # Keydown events
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                pig.moving_right = True
            elif event.key == pygame.K_LEFT:
                pig.moving_left = True
            elif event.key == pygame.K_UP:
                pig.moving_up = True
            elif event.key == pygame.K_DOWN:
                pig.moving_down = True

        # Keyup events
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_RIGHT:
                pig.moving_right = False
            elif event.key == pygame.K_LEFT:
                pig.moving_left = False
            elif event.key == pygame.K_UP:
                pig.moving_up = False
            elif event.key == pygame.K_DOWN:
                pig.moving_down = False

    screen.fill(blue_sky)

    pig.blitme()
    pig.update()

    pygame.display.flip()

pig类:(这是缩进的.我只是不知道如何在此处正确复制和粘贴我的代码)

The pig class: (This is indented. I just don't know how to properly copy and paste my code here)

import pygame 

class Pig():

    def __init__(self, screen):
        """Initialize the pig and set its starting position."""
        self.screen = screen

        # Load the pig image and set pig and screen to rect.
        self.image = pygame.image.load('pig.png')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        # Start the pig at the bottom center of the screen.
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

        # Speed of the pig
        self.pig_speed = 1.5
        self.center = float(self.pig_speed)

        # Set a variable for each movement.
        self.moving_right = False
        self.moving_left = False
        self.moving_up = False
        self.moving_down = False

        self.direction = ['right', 'left']

    def update(self):
        """Update the position of the pig."""

        if self.rect.right <= self.screen_rect.right:
            if self.moving_right:
                self.rect.centerx += self.pig_speed

        if self.rect.left > 0:
            if self.moving_left:
                self.rect.centerx -= self.pig_speed

        if self.rect.top > 0:
            if self.moving_up:
                self.rect.bottom -= self.pig_speed

        if self.rect.bottom <= self.screen_rect.bottom:
            if self.moving_down:
                self.rect.bottom += self.pig_speed

    def blitme(self):
        """Draw the pig at its current location."""
        self.screen.blit(self.image, self.rect)

推荐答案

添加猪的方向变量.将其设置为按下键，请勿将其更改为重新按下键.使运动依赖于moving_direction变量，显示的sprite依赖于direction变量.

Add a pig orientation variable. Set it on key down, don't change it back on key up. Have movement rely on the moving_direction variable and the sprite displayed rely on the orientation variable.

像这样更改blitme:

Change blitme like so:

def blitme(self):
    if self.orientation == "Right":
        self.screen.blit(self.image, self.rect)
    elif self.orientation == "Left":
        self.screen.blit(pygame.transform.flip(self.image, False, True), self.rect)

然后，您可以像这样设置按键逻辑:

Then you can have your key press logic like so:

elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                pig.moving_right = True
                pig.orientation = "Right"
            elif event.key == pygame.K_LEFT:
                pig.moving_left = True
                pig.orientation = "Left"
            elif event.key == pygame.K_UP:
                pig.moving_up = True
            elif event.key == pygame.K_DOWN:
                pig.moving_down = True

通过这种方式，您可以将显示和移动逻辑分开.

In this way you can separate display and movement logic.

这篇关于如何在pygame中水平翻转图像?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！