Hey,
Can you try doing a fill to your surface first?
I guess it's likely a bug in the drawing code.
Here is the wrapper source for the circle function...
https://bitbucket.org/pygame/pygame/src/427a9ac7bd91/src/gfxdraw.c#cl-404
and here is the C code...
https://bitbucket.org/pygame/pygame/src/427a9ac7bd91/src/SDL_gfx/SDL_gfxPrimitives.c
On Fri, Aug 26, 2011 at 2:15 PM, Aaron Brady castiro...@gmail.com wrote:
On Aug 26, 6:34 am, René Dudfield ren...@gmail.com wrote:
[snip]
I'd like to know if anti-aliased objects, in particular the edges of
lines and fonts, can be rendered using transparency instead of
directly blended colors. Specifically, can the function calls draw 4-
tuples of ( r, g, b ) specified in the arguments, plus + ( a, ), the
proportion of intensity determined by the drawing algorithm?
The trick can of course be accomplished with 'numpy', the numerics
package, but it is a heavyweight solution, in particular complicated
and distracting, where programmer time is scarce; and slower, where
run-time environment CPU time is scarce.
Hey,
have you tried out the gfxdraw package? That's got some antialiased
drawing
functions.
Hi, thanks for the fast reply.
Yes, the 'bezier_motion' screenshot used the bezier method in
gfxdraw. I wouldn't mind seeing a filled pie, though. I used an
approximation to accomplish it.
http://home.comcast.net/~castironpi-misc/draggable_pie.1311632054.png
Regarding the anti-aliasing, I ran this code:
import pygame
pygame.init( )
(6, 0)
scr= pygame.display.set_mode(( 640,480 ) )
surf= pygame.Surface((400,400)).convert_alpha( )
import pygame.gfxdraw
pygame.draw.aaline(surf,(0,255,0),(50,100),(150,350))
rect(50, 100, 102, 252)
pygame.gfxdraw.aacircle(surf,200,250,50,(0,0,255))
surf.get_at((52,103)) # on the line
(0, 102, 0, 0)
surf.get_at((194,200)) # on the circle
(0, 0, 162, 103)
surf.get_at((109,247)) # on the line
(0, 254, 0, 0)
# part 2, continued
surf.fill((0,0,0,0))
rect(0, 0, 400, 400)
pygame.draw.aaline(surf,(0,255,0,255),(50,100),(150,350))
rect(50, 100, 102, 252)
pygame.gfxdraw.aacircle(surf,200,250,50,(0,0,255,255))
surf.get_at((52,103))
(0, 102, 0, 102)
surf.get_at((194,200))
(0, 0, 162, 103)
surf.get_at((109,247))
(0, 254, 0, 254)
As you can see, I tried both length-3 and length-4 tuples for the
color argument. In these examples, the results I want would be:
surf.get_at((52,103))
(0, 255, 0, 102)
surf.get_at((194,200))
(0, 0, 255, 103) # or (0, 0, 255, 162), unclear
surf.get_at((109,247))
(0, 255, 0, 254)
Does this help to clarify?
