Re: [pygame] left-over pixels in pygame.draw.circle?

[Lenard Lindstrom <len-l@xxxxxxxxx>]

This has come up before. The circle algorithm uses a crude approach to 
give thickness. It draws several circles of thickness 1 at differing radii.

Lenard


Hugo Arts wrote:
> I've been getting strange results in pygame.draw.circle and 
> pygame.draw.arc:
> if I specify a (non-zero) width for the circle/arc the resulting image 
> is not drawn properly.
> A strange pattern of pixels remains its previous color on the target 
> surface. This does not occur if I completely fill the circle/arc
>
> I've put up an image that might explain things more clearly. It is the 
> pygame window resulting from this code:
>
> >>> import pygame
> >>> screen = pygame.display.set_mode((100, 100))
> >>> pygame.draw.circle(screen, (255, 255, 255), (50, 50), 40, 20)
> <rect(30, 30, 40, 40)>
> >>> pygame.display.update()
>
> here's the link to the image: 
> http://img355.imageshack.us/img355/3488/circlehh4.png
>
> I tried this both on 1.7.1 and 1.8.0 (I was still running 1.7.1, 
> thought that upgrading might fix it), and it happens on both versions.
> I am running this on a Linux box.