On 5/18/07, Darren Dale <[EMAIL PROTECTED]> wrote:
> > Using some dedicated class-instance instead of a dict would allow for:
> > - automatic conistency checks on setting
> > - possibly even change propagation (likely faster and certainly less
> > error prone if done right: I'm not sure how many places rcParams dependent
> > results apart from the tex-stuff are cached and should be recomputed when
> > certain params change, but obviously an push/'event'-based solutin could be
> > faster than pull/polling)
> This sounds like a good proposal to me. Some other devs had considered using
> the traits package to address some of these points. Maybe they will comment.
>
> > 2. It also seems to me that having some custom config file format rather
> > than just (a literal-only subset of) python is suboptimal. Why make people
> > learn another and more limited syntax when python literals are already
> > familiar and both more powerful and easier to use
>
> If someone donated a nickel for every time I have seen this argument on the
> mailing list, we might have enough money to buy John a doughnut.
Yes, we've often talked about using traits here and elsewhere but the
idea has languished because it has never made it to the top of
anyone's priority queue. I just added examples/rc_traits.py, which is
the example code I wrote some time ago when I was exploring how to use
traits for rc and other mpl properties. I'll also post it again here
in case someone wants to run with it.
# I spent some time working on matplotlib rc properties as enthought
# traits as a precursor to porting matplotlib properties to traits.
# Here is some example code showing how to define some representative rc
# properties and construct a matplotlib artist using traits. Because
# matplotlib ships with enthought traits already, you can run this
# script with just matplotlib. Unfortunately, we do not ship the ex UI
# component so you can't test that part. I'm a bit of a traits newbie
# so there are probably better ways to do what I have done below.
import sys, os, re
import matplotlib.enthought.traits as traits
from matplotlib.cbook import is_string_like
from matplotlib.artist import Artist
doprint = True
flexible_true_trait = traits.Trait(
True,
{ 'true': True, 't': True, 'yes': True, 'y': True, 'on': True, True: True,
'false': False, 'f': False, 'no': False, 'n': False, 'off':
False, False: False
} )
flexible_false_trait = traits.Trait( False, flexible_true_trait )
colors = {
'c' : '#00bfbf',
'b' : '#0000ff',
'g' : '#008000',
'k' : '#000000',
'm' : '#bf00bf',
'r' : '#ff0000',
'w' : '#ffffff',
'y' : '#bfbf00',
'gold' : '#FFD700',
'peachpuff' : '#FFDAB9',
'navajowhite' : '#FFDEAD',
}
def hex2color(s):
"Convert hex string (like html uses, eg, #efefef) to a r,g,b tuple"
return tuple([int(n, 16)/255.0 for n in (s[1:3], s[3:5], s[5:7])])
class RGBA(traits.HasTraits):
# r,g,b,a in the range 0-1 with default color 0,0,0,1 (black)
r = traits.Range(0., 1., 0.)
g = traits.Range(0., 1., 0.)
b = traits.Range(0., 1., 0.)
a = traits.Range(0., 1., 1.)
def __init__(self, r=0., g=0., b=0., a=1.):
self.r = r
self.g = g
self.b = b
self.a = a
def __repr__(self):
return 'r,g,b,a = (%1.2f, %1.2f, %1.2f, %1.2f)'%\
(self.r, self.g, self.b, self.a)
def tuple_to_rgba(ob, name, val):
tup = [float(x) for x in val]
if len(tup)==3:
r,g,b = tup
return RGBA(r,g,b)
elif len(tup)==4:
r,g,b,a = tup
return RGBA(r,g,b,a)
else:
raise ValueError
tuple_to_rgba.info = 'a RGB or RGBA tuple of floats'
def hex_to_rgba(ob, name, val):
rgx = re.compile('^#[0-9A-Fa-f]{6}$')
if not is_string_like(val):
raise TypeError
if rgx.match(val) is None:
raise ValueError
r,g,b = hex2color(val)
return RGBA(r,g,b,1.0)
hex_to_rgba.info = 'a hex color string'
def colorname_to_rgba(ob, name, val):
hex = colors[val.lower()]
r,g,b = hex2color(hex)
return RGBA(r,g,b,1.0)
colorname_to_rgba.info = 'a named color'
def float_to_rgba(ob, name, val):
val = float(val)
return RGBA(val, val, val, 1.)
float_to_rgba.info = 'a grayscale intensity'
Color = traits.Trait(RGBA(), float_to_rgba, colorname_to_rgba, RGBA,
hex_to_rgba, tuple_to_rgba)
def file_exists(ob, name, val):
fh = file(val, 'r')
return val
def path_exists(ob, name, val):
os.path.exists(val)
linestyles = ('-', '--', '-.', ':', 'steps', 'None')
TICKLEFT, TICKRIGHT, TICKUP, TICKDOWN = range(4)
linemarkers = (None, '.', ',', 'o', '^', 'v', '<', '>', 's',
'+', 'x', 'd', 'D', '|', '_', 'h', 'H',
'p', '1', '2', '3', '4',
TICKLEFT,
TICKRIGHT,
TICKUP,
TICKDOWN,
'None'
)
class LineRC(traits.HasTraits):
linewidth = traits.Float(0.5)
linestyle = traits.Trait(*linestyles)
color = Color
marker = traits.Trait(*linemarkers)
markerfacecolor = Color
markeredgecolor = Color
markeredgewidth = traits.Float(0.5)
markersize = traits.Float(6)
antialiased = flexible_true_trait
data_clipping = flexible_false_trait
class PatchRC(traits.HasTraits):
linewidth = traits.Float(1.0)
facecolor = Color
edgecolor = Color
antialiased = flexible_true_trait
timezones = 'UTC', 'US/Central', 'ES/Eastern' # fixme: and many more
backends = ('GTKAgg', 'Cairo', 'FltkAgg', 'GD', 'GDK', 'GTK', 'Agg',
'GTKCairo', 'Paint', 'PS', 'SVG', 'Template', 'TkAgg',
'WX')
class RC(traits.HasTraits):
backend = traits.Trait(*backends)
numerix = traits.Trait('Numeric', 'numarray')
interactive = flexible_false_trait
toolbar = traits.Trait('toolbar2', 'classic', None)
timezone = traits.Trait(*timezones)
lines = traits.Trait(LineRC())
patch = traits.Trait(PatchRC())
rc = RC()
rc.lines.color = 'r'
if doprint:
print 'RC'
rc.print_traits()
print 'RC lines'
rc.lines.print_traits()
print 'RC patches'
rc.patch.print_traits()
class Patch(Artist, traits.HasTraits):
linewidth = traits.Float(0.5)
facecolor = Color
fc = facecolor
edgecolor = Color
fill = flexible_true_trait
def __init__(self,
edgecolor=None,
facecolor=None,
linewidth=None,
antialiased = None,
fill=1,
**kwargs
):
Artist.__init__(self)
if edgecolor is None: edgecolor = rc.patch.edgecolor
if facecolor is None: facecolor = rc.patch.facecolor
if linewidth is None: linewidth = rc.patch.linewidth
if antialiased is None: antialiased = rc.patch.antialiased
self.edgecolor = edgecolor
self.facecolor = facecolor
self.linewidth = linewidth
self.antialiased = antialiased
self.fill = fill
p = Patch()
p.facecolor = '#bfbf00'
p.edgecolor = 'gold'
p.facecolor = (1,.5,.5,.25)
p.facecolor = 0.25
p.fill = 'f'
print 'p.facecolor', type(p.facecolor), p.facecolor
print 'p.fill', type(p.fill), p.fill
if p.fill_: print 'fill'
else: print 'no fill'
if doprint:
print
print 'Patch'
p.print_traits()
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
Matplotlib-devel mailing list
Matplotlib-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
