Re: [pygame] Changing the size of a sprite

[Jim Scott <jimdscottesq@yahoo.com>]

I'm not an expert, either, but if I'm way off base, I hope one of the real
gurus will help out.

Changing self.rect by itself would only change the position of the image on the
screen. You need to change self.image to get a different size. If self.image is
loaded from a graphics file, you could use pygame.transform.scale or
pygame.transform.rotozoom to get a different size self.image. If you are
drawing a simple polygon, you will need to generate that again, too.

--- John Hopkin <john.hopkin@brookview.karoo.co.uk> wrote:
> Basically, this is what I'm doing - it may be wrong, but I was
> encouraged to see the sprites moving:
> 
> def main():
> 	[non-sprite stuff ...]
> 	sganimals=pygame.sprite.Group()
> 	[creation of sprites, which add themselves to sganimals]
> 	allsprites = pygame.sprite.RenderPlain((sganimals))
> 	while 1:
> 		[handle changes to map parameters, which
> 			affect the sprites' positions & sizes...]
> 		sganimals.update()
> 		screen.blit(screen,(0,0))	# screen is the surface
> 		allsprites.draw(screen)
> 		pygame.display.flip()
> 		
> I'll freely admit I'm not sure that this is the correct or best
> method.
> 
> Thanks.
> 
> Jim Scott wrote:
> 
> >What is your draw method?
> >
> >--- John Hopkin <john.hopkin@brookview.karoo.co.uk> wrote:
> >> I'm a newbie to pygame (and to Python), so please bear with me.
> >> 
> >> I'm trying to change the size and position of a sprite in its "update"
> >> method - the position changes fine, but the size stays the same.
> >> Here's the code:
> >> 
> >>     def update(self):
> >>         mapx,mapy,mapsize = self.map.PositionAnimal(self.x,self.y)
> >>         self.rect.topleft = mapx, mapy
> >>         self.rect.width = mapsize
> >>         self.rect.height = mapsize
> >>         print "updated:", self.rect.width
> >> 
> >> The PositionAnimal function returns the new position and size of the
> >> sprite, and the debug print at the end reflects the new size.  The
> >> sprite moves when PositionAnimal tells it to, but stays the same size.
> >> 
> >> Am I missing something here?  Have I provided enough information?
> >
> >
> >=====
> >"'Beware of the man who works hard to learn something, learns it, and finds
> himself no wiser than before,' Bokonon tells us. 'He is full of murderous
> resentment of people who are ignorant without having come by their ignorance
> the hard way.'" -- Kurt Vonnegut, "Cat's Cradle"
> >
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