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#------------------------------------------------------------------------------
#
# Copyright (c) 2009, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
#
#------------------------------------------------------------------------------
""" Trait definition for an RGB-based color, which is a tuple of the form
(*red*, *green*, *blue*), where *red*, *green* and *blue* are floats in the
range from 0.0 to 1.0.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from traits.api import Trait, TraitError
from traits.trait_base import SequenceTypes
from traitsui.qt4.color_trait import standard_colors
#-------------------------------------------------------------------------------
# Convert a number into an RGB tuple:
#-------------------------------------------------------------------------------
def range_check(value):
""" Checks that *value* can be converted to a value in the range 0.0 to 1.0.
If so, it returns the floating point value; otherwise, it raises a
TraitError.
"""
value = float(value)
if 0.0 <= value <= 1.0:
return value
raise TraitError
def convert_to_color(object, name, value):
""" Converts a tuple or an integer to an RGB color value, or raises a
TraitError if that is not possible.
"""
if isinstance(value, SequenceTypes) and len(value) == 3:
return (range_check(value[0]),
range_check(value[1]),
range_check(value[2]))
if isinstance(value, int):
return ((value / 0x10000) / 255.0,
((value / 0x100) & 0xFF) / 255.0,
(value & 0xFF) / 255.0)
raise TraitError
convert_to_color.info = ('a tuple of the form (r,g,b), where r, g, and b '
'are floats in the range from 0.0 to 1.0, or an integer which in hex is of '
'the form 0xRRGGBB, where RR is red, GG is green, and BB is blue')
#-------------------------------------------------------------------------------
# Standard colors:
#-------------------------------------------------------------------------------
# RGB versions of standard colors:
rgb_standard_colors = {}
for name, color in standard_colors.items():
rgb_standard_colors[name] = (color.redF(),
color.greenF(),
color.blueF())
#-------------------------------------------------------------------------------
# Define wxPython specific color traits:
#-------------------------------------------------------------------------------
### Note: Declare the editor to be a function which returns the RGBColorEditor
# class from traits ui to avoid circular import issues. For backwards
# compatibility with previous Traits versions, the 'editors' folder in Traits
# project declares 'from api import *' in its __init__.py. The 'api' in turn
# can contain classes that have a RGBColor trait which lead to this file getting
# imported. This will lead to a circular import when declaring a RGBColor trait.
def get_rgb_color_editor(*args, **traits):
from rgb_color_editor import ToolkitEditorFactory
return ToolkitEditorFactory(*args, **traits)
# Trait whose value must be an RGB color:
RGBColor = Trait('white', convert_to_color, rgb_standard_colors,
editor=get_rgb_color_editor)
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