如何在pygame中水平翻转图像?

时间:2017-08-09 21:45:43

标签: python python-2.7 python-3.x pygame pygame-surface

这是在pygame中。如何翻转图像(让我们说一个图像 猪向右看)向左看时 我按下左箭头键,保持这样状态 即使我没有按任何键或按下上下箭头键。然后,当我按下右箭头键并使其保持不变时,如何再次将其切换回来向右看,即使我没有按任何键或按下向上和向下箭头键。

我知道我必须使用 pygame.transform.flip()。但是,我不知道如何将它放在我的代码中。

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()

猪班:(这是缩进的。我只是不知道如何正确地复制和粘贴我的代码)

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)

3 个答案:

答案 0 :(得分:2)

pygame.transform.flip有三个参数:

  1. 您要翻转的surface
  2. 表示表面应水平翻转的布尔值
  3. 表示应垂直翻转表面的布尔值
  4. 要翻转曲面,只能垂直传递True作为第三个参数:

    flipped_surface = pygame.transform.flip(surface, False, True)
    

    关于您的具体问题,您可以这样做:

    PIG_RIGHT = pygame.image.load('pig.png').convert()
    PIG_LEFT = pygame.transform.flip(PIG_RIGHT, True, False)
    
    pig = Pig(screen, PIG_RIGHT)  # Assign this image to `self.image`.
    clock = pygame.time.Clock()
    
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    pig.moving_right = True
                    pig.image = PIG_RIGHT
                elif event.key == pygame.K_LEFT:
                    pig.moving_left = True
                    pig.image = PIG_LEFT
    
        screen.fill(blue_sky)
    
        pig.blitme()
        pig.update()
    
        pygame.display.flip()
        clock.tick(30)
    

    您还可以在Pig课程中存储两个词条,并根据self.imageself.moving_rightself.moving_left的状态切换self.direction属性。

答案 1 :(得分:1)

添加猪方向变量。将其设置为按键,不要在按键时将其更改回来。运动依赖于moving_direction变量,显示的精灵依赖于方向变量。

像这样改变blitme:

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)

然后你就可以按下这样的按键逻辑:

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,您可以分离显示和移动逻辑。

答案 2 :(得分:0)

尝试添加以下内容:

elif event.key == pygame.K_RIGHT:
    pig.image = pygame.transform.flip(pig.image, True, False)
    pygame.display.update()'''I dont think you need this'''
elif event.key == pygame.K_LEFT:
    pig.image = pygame.transform.flip(pig.image, True, False)
    pygame.display.update()'''Or this'''