On Nov 27, 2007 9:13 AM, Leif Hille <> wrote:
> William -
>
> REF: http://sagetrac.org/sage_trac/ticket/799
>
> I dunno if this is the right way to comment on bugs however, I ran into the
> same problem as the ticket's author. This "bug" ticket is part bug, part
> user error (or poor documentation).
Hi, I've added your comments below to the above trac ticket. They will
be very very helpful when we fix #799 (perhaps on bug day this Saturday...?)
Thanks!
>
> (1) The user error part: In order to create a texture using a number other
> than zero, you have to pass in a .texfunc() object.
>
> (2) The bug part: There is a problem with the plot/tachyon.py function that
> prevents additional key parameters from being passed in.
>
> Explanation:
> t.texture('grey', color=(.5,.5,.5), texfunc=0) --> this works
> t.texture('dk_grey', color=(0.8,0.8,0.8),textfunc=1) --> this causes
> subsequent t.show() command to fail.
>
> Solution:
> (1) While the t.texture(...) function allows for 'texfunc=0' as an argument,
> for any number greater than 0, it expects a texfunc object.
>
> ie:
> r=t.texfunc(2)
> t.texture('grey', color=(.5,.5,.5), texfunc=r)
>
> This is not evident from the inline help & the interface doesn't complain
> when it's passed bad input - it just fails when t.show() is called (verbose
> mode reveals the tachyon parser's complaints).
>
> (2) The bug is that some of the predefined numbered textures require
> additional string input (eg. a file name for a texture map image/data)
> immediately after the texture number. The texture number is passed in as a
> number. I've made a workaround, making the "type" parameter into a
> string(see changes below), allowing for filenames to be specified when the
> texture number calls for it. This is still a little troublesome in that
> because it's not obvious to me how to reference filenames of graphics
> created within Sage (maybe there should there be a toplevel "fileref" method
> to get a filesystem path reference to existing graphic image or dataset).
> The same filereference problem presents if the user wants to use another
> graphic or datafile as a texture map.
>
> ##from : .../plot/tachyon.py...
> class Texfunc:
> def __init__(self, type=0,center=(0,0,0), rotate=(0,0,0), scale=(1,1,1)):
> self._type = type
> self._center = center
> self._rotate = rotate
> self._scale = scale
>
> def str(self):
> if type == 0:
> return "0"
> # Old Code
> # return """%d center %s rotate %s scale %s"""%(self._type, #
> <-- number
> # >tostr(self._center),
> # >tostr(self._rotate),
> # tostr(self._scale))
> # new code:
> return """%s center %s rotate %s scale %s"""%(tostr(self._type),
> # <-- string
> >tostr(self._center),
> >tostr(self._rotate),
> tostr(self._scale))
>
>
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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