皮蒙克如何设置隐形身体？

Question

我在 Pygame 上创建了一个游戏，并使用 Pymunk 添加了物理效果，但遇到了一个问题，Pymunk 的身体渲染在 Pygame 的原始玩家纹理之上。如何让这个身体隐形？

import pygame
import pymunk.pygame_util
import random
import math


SIZE = WIDTH, HEIGHT = 1000, 600
BACKGROUND_COLOR = (255, 255, 255)
FPS = 30


pygame.init()
pymunk.pygame_util.positive_y_is_up = False


class Player(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.orig_image = pygame.Surface((50, 100), pygame.SRCALPHA)
        self.orig_image.fill((0, 255, 0))
        self.orig_image = pygame.transform.scale(self.orig_image, self.orig_image.get_size())
        self.image = self.orig_image.copy()
        self.rect = self.image.get_rect(center=(500, 500))

        self.vel = 0
        self.angle = 0
        self.vel_speed = 5
        self.rotate_speed = 10

        self.space = pymunk.Space
        self.body = pymunk.Body
        self.shape = pymunk.Poly

    def update(self, display):
        self.vel = 0
        event_key = pygame.key.get_pressed()
        if event_key[pygame.K_UP]:
            self.vel -= self.vel_speed
        if event_key[pygame.K_DOWN]:
            self.vel += self.vel_speed
        if event_key[pygame.K_LEFT]:
            self.angle += self.rotate_speed
        if event_key[pygame.K_RIGHT]:
            self.angle -= self.rotate_speed

        self.body.position += ((self.vel * math.sin(math.radians(self.angle)),
                                self.vel * math.cos(math.radians(self.angle))))
        self.rect.center = self.body.position
        self.body.angle = -math.radians(self.angle)

        self.image = pygame.transform.rotate(self.orig_image, self.angle)
        self.rect = self.image.get_rect(center=self.rect.center)
        display.blit(self.image, self.rect)

    def physics(self, pm_space):
        size = self.rect.size
        mass = 5
        moment = pymunk.moment_for_box(mass, size)
        self.body = pymunk.Body(mass, moment)
        self.shape = pymunk.Poly.create_box(self.body, size)
        self.shape.elasticity = 1
        self.shape.friction = 2
        self.body.position = self.rect.center
        self.space = pm_space
        self.space.add(self.body, self.shape)


pygame.display.set_caption("Pygame")
display = pygame.display.set_mode(SIZE)
clock = pygame.time.Clock()

draw_option = pymunk.pygame_util.DrawOptions(display)
space = pymunk.Space()
space.gravity = (0, 0)

segment_shape = pymunk.Segment(space.static_body, (100, 200), (400, 200), 20)
space.add(segment_shape)
segment_shape.elasticity = 1
segment_shape.friction = 1

all_sprites = pygame.sprite.Group()
player = Player()
player.physics(space)
all_sprites.add(player)


def create_square(space, pos):
    square_mass = 1
    square_size = (50, 50)
    square_moment = pymunk.moment_for_box(square_mass, square_size)
    square_body = pymunk.Body(square_mass, square_moment)
    square_body.position = pos
    square_shape = pymunk.Poly.create_box(square_body, square_size)
    square_shape.elasticity = 0.8
    square_shape.friction = 1
    square_shape.color = [random.randrange(256) for i in range(4)]
    space.add(square_body, square_shape)


running = True
while running:
    clock.tick(FPS)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    if pygame.mouse.get_pressed()[0]:
        create_square(space, pygame.mouse.get_pos())

    display.fill((255, 255, 255))

    space.debug_draw(draw_option)
    space.step(3 / FPS)

    all_sprites.update(display)
    all_sprites.draw(display)

    pygame.display.update()
pygame.quit()

仅需要从 Pygame 渲染玩家的纹理，将来可以用图像替换

Answer 1

您可以简单地不在

debug_draw

函数中绘制 Pymunk 主体。由于您使用的是 Pymunk 的调试绘图，因此您可以通过将回调函数传递给

debug_draw

方法来排除某些形状的绘制。

试试这个：

def draw_shapes(space, shapes, *args, **kwargs):
    for shape in shapes:
        if hasattr(shape, 'color'):
            if shape.color[3] != 0:
                pymunk.pygame_util.draw_shape(space.debug_screen, shape, *args, **kwargs)

# Modify the debug draw line to exclude drawing the player's body
space.debug_draw(draw_option, draw_shapes=[segment_shape, *all_sprites.sprites()[0].shape])

此修改将排除绘制

segment_shape

以及与玩家身体相关的形状，从而仅从 Pygame 渲染玩家的纹理。