为什么我会收到此错误:“无效的 rectstyle 参数"? [英] Why am I getting this error: "Invalid rectstyle argument"

问题描述

我目前正在用 python 制作一个游戏，其中一个球击中了一组盒子.我已经加载了一张我想让盒子站在上面的草的图像，草图像是 600 x 151 像素.到目前为止，我已经让所有的盒子和球完美地出现了，但是当前不起作用的是，当我尝试加载图像并显示它时，盒子可以站在草地图像上而不是掉下来.

I am currently making a game in python where a ball hits a group of boxes. I have loaded an image of a grass that I wanted the boxes to stand on, the grass image is 600 by 151 pixels. So far I have all the boxes and the ball appearing perfectly however, What is not working currently is when I try to load the image and display it so that the boxes can stand on the grass image instead of falling off.

import pygame
from pygame.locals import *
from pygame.color import *
import pymunk as pm
from pymunk import Vec2d
import sys
from random import randint

def to_pygame(p):
    """Small hack to convert pymunk to pygame coordinates"""
    return int(p[0]), int(-p[1]+600)


def add_box(space, size, pos, mass=1.0):
    # pos is a Vec2d object
    points = [(-size, -size), (-size, size), (size,size), (size, -size)]
    moment = pm.moment_for_poly(int(mass), points, (0,0))

    body = pm.Body(mass, moment)
    body.position = pos

    shape = pm.Poly(body, points, (0,0))
    shape.friction = 1
    space.add(body,shape)

    return shape

def draw_box(screen, box):
    ps = box.get_points()
    ps.append(ps[0])
    ps = map(to_pygame, ps)
    pygame.draw.polygon(screen, THECOLORS["blue"], ps, 3)


def main():
    pygame.init()
    screen = pygame.display.set_mode((600, 600))
    pygame.display.set_caption("Piling boxes")
    clock = pygame.time.Clock()

    boxes = []
    x = 170
    y = 120
    space = pm.Space()
    space.gravity = (0.0, -100.0)

    ### ground
    body = pm.Body()
    shape = pm.Segment(body, (150,100), (450,100), .0)
    shape.friction = 4.4
    space.add(shape)

    for i in range(5):
        # what is the mass of the box?
        mass = randint(1,3)
        # what size is the box?
        size = randint(10, 35)
        # calculate its position & hold it in a Vec2d

        #x = x + size + 10
        y = y + size
        pos = Vec2d(x,y)

        box = add_box(space, size, pos, mass)
        boxes.append(box)

    while 1:
        clock.tick(15)
        space.step(1/30.0)

        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit(0)
            elif event.type == KEYDOWN:
                if event.key == K_ESCAPE:
                    pygame.quit()
                    sys.exit(0)

        screen.fill(THECOLORS["white"])
        test_image = pygame.image.load("grass.png")

        screen.blit(test_image, to_pygame((450,100)), to_pygame((150,100)),3)


        for i in range(len(boxes)):
            draw_box(screen, boxes[i])

        pygame.display.flip()


if __name__ == '__main__':
    main()

推荐答案

blit 中的第三个参数是源 area 参数，应该是一个矩形，而不是坐标:

The third argument in blit is the source area argument, should be a rectangle, not coordinates:

screen.blit(test_image, to_pygame((450,100)), to_pygame((150,100)),3)

也许你想要这个:

screen.blit(test_image, to_pygame((450,100)), pygame.Rect((0,0), (150,100)), 3)

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