Re: [pygame] Scaling the hitbox/rect of a sprite

[bw <stabbingfinger@xxxxxxxxx>]

Example attached. This might get you going.

Gumm

On 5/23/2014 07:02, Skorpio wrote:
> Thanks for the help everybody, but it still doesn't work.
>
> I've tried these functions as collided values (as Jeffrey Kleykamp
> suggested):
>
> pygame.sprite.collide_rect() takes only sprites as values and then uses
> their rects. That means I can't use the sprite's scaled "hitbox" attribute,
> otherwise I get this error: AttributeError: 'pygame.Rect' object has no
> attribute 'rect'
> And if I do sprite.rect = sprite.hitbox, the image gets blitted at the top
> left corner again.
>
> pygame.Rect.colliderect() doesn't work.
>
> pygame.sprite.collide_rect_ratio() works as intended but causes a huge
> performance drop, so it's not useable for me. I have quite a lot of sprites
> on the screen (sometimes over 100).
>
> Christopher Night is right. It would be a lot easier for me, if Pygame
> sprites had an additional (optional) hitbox rect.
>
> Maybe I should rewrite my collision detection passage and just use
> pygame.Rect.colliderect() instead of pygame.sprite.spritecollide().
>
>
>
> --
> View this message in context: http://pygame-users.25799.x6.nabble.com/pygame-Scaling-the-hitbox-rect-of-a-sprite-tp1227p1237.html
> Sent from the pygame-users mailing list archive at Nabble.com.

import pygame
from pygame.locals import *
screen = pygame.display.set_mode((800, 600))
screen_rect = screen.get_rect()
clock = pygame.time.Clock()
avatar_group = pygame.sprite.Group()
blob_group = pygame.sprite.Group()
class Thing(pygame.sprite.Sprite):
    def __init__(self, rect, color):
        super(Thing, self).__init__()
        self.rect = rect
        self.color = color
        self.image = pygame.Surface(rect.size)
        self.image.fill(color)
        self.hitbox = rect.inflate(20, 20)
    def update(self):
        self.hitbox.center = self.rect.center
    
    
def collided(this, other):
    return this.hitbox.colliderect(other.hitbox)

avatar = Thing(Rect(screen_rect.center, (20, 20)), Color('blue'))
avatar_group.add(avatar)
for p in ((100, 100),(100, 400),(400, 400)):
    blob_group.add(Thing(Rect(p, (20, 20)), Color('red')))
while True:
    screen.fill((0, 0, 0))
    clock.tick(30)
    if any([e.type == KEYDOWN for e in pygame.event.get()]):
        quit()
    pos = pygame.mouse.get_pos()
    avatar.rect.center = pos
    avatar_group.update()
    blob_group.update()
    blob_group.draw(screen)
    avatar_group.draw(screen)
    
    hits = pygame.sprite.groupcollide(
        avatar_group, blob_group, False, False, collided)
    
    for g in blob_group, avatar_group:
        for s in g:
            if s in hits:
                pygame.draw.rect(screen, Color('red'), s.hitbox, 1)
            else:
                pygame.draw.rect(screen, Color('grey'), s.hitbox, 1)
    
    pygame.display.flip()