How can I use tiling in a game with python and pygame?

Question

I'm creating a 2D platformer type shooting game using python and pygame, and I'm trying to add in tiling mechanics so If I created a platform 100 pixels long and the tile image was only 70 pixels long, it would draw one tile and half of another, so I created a simple prototype, but I can't get it to draw the sprite. Here's my code for it:

import pygame

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

class Rec(pygame.sprite.Sprite):

    def __init__(self, x, y, w, height):

        super().__init__()

        self.b = 0
        self.image = pygame.image.load("grass.png").convert()
        if w <= 70:
            self.image = pygame.transform.scale(self.image, (w, height))
        elif w > 70:
            self.image = pygame.Surface([w, height])
            while self.b < w:
                self.image.blit(pygame.image.load("grass.png").convert(), (x + self.b, y))
                self.b += 70

        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

pygame.init()

size = (700, 500)

screen = pygame.display.set_mode(size)

pygame.display.set_caption("My Game")

all_sprites_list = pygame.sprite.Group()

rec = Rec(100, 200, 140, 70)
all_sprites_list.add(rec)

done = False

clock = pygame.time.Clock()

while not done:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
    screen.fill(WHITE)
    all_sprites_list.draw(screen)
    pygame.display.flip()
    clock.tick(60)

pygame.quit()

Platformers always use use full tile - so make platform 70px or create tile 50px (2*50=100) or create two tiles 70px + 30px — furas
– furas, Commented Feb 11, 2016 at 8:38
I don't think you understood my question. I know how to draw full and half tiles and everything, I just can't get it to actually draw it onto the screen. When I run it the platform is just black. — Merle
– Merle, Commented Feb 11, 2016 at 8:43
so you gave not enough information - you didn't said you have black screen :) And nobody will run code to see your real problem. — furas
– furas, Commented Feb 11, 2016 at 11:16

sloth · Accepted Answer · 2016-02-11 09:52:28Z

1

The line

self.image.blit(pygame.image.load("grass.png").convert(), (x + self.b, y))

should be

self.image.blit(pygame.image.load("grass.png").convert(), (self.b, 0))

since the position you pass to the blit function are relative to the Surface you blit on; but x and y are screen coordinates.

So in your example you blit the grass image with a position of x + self.b = 100, y = 200 on a Surface which has a size of (140, 70), while you should blit the it at (0, 0).

answered Feb 11, 2016 at 9:52

sloth

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