python - Why am I getting this error: "Invalid rectstyle argument"

Question

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()

Answer 1

No traceback or error log so it is a bit hard to identify the point of the error, an educated guess would be that you are passing Rectstyle arguments incorrectly somewhere. Please see the documentation for pygame.Rect on how to pass Rectstyle args correctly.

pygame.Rect(left, top, width, height): return Rect
pygame.Rect((left, top), (width, height)): return Rect
pygame.Rect(object): return Rect