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<h1>misc example code: rc_traits.py<a class="headerlink" href="#misc-example-code-rc-traits-py" title="Permalink to this headline">¶</a></h1>

[<a class="reference external" href="rc_traits.py">source code</a>]

<div class="highlight-default"><div class="highlight"><pre># -*- noplot -*-

# Here is some example code showing how to define some representative

# rc properties and construct a matplotlib artist using traits.

# matplotlib does not ship with enthought.traits, so you will need to

# install it separately.

from __future__ import print_function

import sys

import os

import re

import traits.api 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

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)

hex_to_rgba.info = 'a hex color string'

def colorname_to_rgba(ob, name, val):

hex = colors[val.lower()]

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

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):

facecolor = Color

edgecolor = Color

antialiased = flexible_true_trait

timezones = 'UTC', 'US/Central', 'ES/Eastern' # fixme: and many more

backends = ('GTKAgg', 'Cairo', 'GDK', 'GTK', 'Agg',

'GTKCairo', 'PS', 'SVG', 'Template', 'TkAgg',

'WX')

class RC(traits.HasTraits):

backend = traits.Trait(*backends)

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):

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()

</pre></div>

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