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Python to generate nice looking SVG graph http://pygal.org/
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pygal/pygal/config.py

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# -*- coding: utf-8 -*-
# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2016 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pygal. If not, see <http://www.gnu.org/licenses/>.
"""Config module holding all options and their default values."""
from copy import deepcopy
from pygal import formatters
from pygal.interpolate import INTERPOLATIONS
from pygal.style import DefaultStyle, Style
CONFIG_ITEMS = []
callable = type(lambda: 1)
class Key(object):
"""
Represents a config parameter.
A config parameter has a name, a default value, a type,
a category, a documentation, an optional longer documentatation
and an optional subtype for list style option.
Most of these informations are used in cabaret to auto generate
forms representing these options.
"""
_categories = []
def __init__(
self, default_value, type_, category, doc,
subdoc="", subtype=None):
"""Create a configuration key"""
self.value = default_value
self.type = type_
self.doc = doc
self.category = category
self.subdoc = subdoc
self.subtype = subtype
self.name = "Unbound"
if category not in self._categories:
self._categories.append(category)
CONFIG_ITEMS.append(self)
def __repr__(self):
"""
Make a documentation repr.
This is a hack to generate doc from inner doc
"""
return """
Type: %s%s     
Default: %r     
%s%s
""" % (
self.type.__name__,
(' of %s' % self.subtype.__name__) if self.subtype else '',
self.value,
self.doc,
(' %s' % self.subdoc) if self.subdoc else ''
)
@property
def is_boolean(self):
"""Return `True` if this parameter is a boolean"""
return self.type == bool
@property
def is_numeric(self):
"""Return `True` if this parameter is numeric (int or float)"""
return self.type in (int, float)
@property
def is_string(self):
"""Return `True` if this parameter is a string"""
return self.type == str
@property
def is_dict(self):
"""Return `True` if this parameter is a mapping"""
return self.type == dict
@property
def is_list(self):
"""Return `True` if this parameter is a list"""
return self.type == list
def coerce(self, value):
"""Cast a string into this key type"""
if self.type == Style:
return value
elif self.type == list:
return self.type(
map(
self.subtype, map(
lambda x: x.strip(), value.split(','))))
elif self.type == dict:
rv = {}
for pair in value.split(','):
key, val = pair.split(':')
key = key.strip()
val = val.strip()
try:
rv[key] = self.subtype(val)
except:
rv[key] = val
return rv
return self.type(value)
class MetaConfig(type):
"""Config metaclass. Used to get the key name and set it on the value."""
def __new__(mcs, classname, bases, classdict):
"""Get the name of the key and set it on the key"""
for k, v in classdict.items():
if isinstance(v, Key):
v.name = k
return type.__new__(mcs, classname, bases, classdict)
class BaseConfig(MetaConfig('ConfigBase', (object,), {})):
"""
This class holds the common method for configs.
A config object can be instanciated with keyword arguments and
updated on call with keyword arguments.
"""
def __init__(self, **kwargs):
"""Can be instanciated with config kwargs"""
for k in dir(self):
v = getattr(self, k)
if (k not in self.__dict__ and not
k.startswith('_') and not
hasattr(v, '__call__')):
if isinstance(v, Key):
if v.is_list and v.value is not None:
v = list(v.value)
else:
v = v.value
setattr(self, k, v)
self._update(kwargs)
def __call__(self, **kwargs):
"""Can be updated with kwargs"""
self._update(kwargs)
def _update(self, kwargs):
"""Update the config with the given dictionary"""
from pygal.util import merge
dir_self_set = set(dir(self))
merge(
self.__dict__, dict([
(k, v) for (k, v) in kwargs.items()
if not k.startswith('_') and k in dir_self_set]))
def to_dict(self):
"""Export a JSON serializable dictionary of the config"""
config = {}
for attr in dir(self):
if not attr.startswith('__'):
value = getattr(self, attr)
if hasattr(value, 'to_dict'):
config[attr] = value.to_dict()
elif not hasattr(value, '__call__'):
config[attr] = value
return config
def copy(self):
"""Copy this config object into another"""
return deepcopy(self)
class CommonConfig(BaseConfig):
"""Class holding options used in both chart and serie configuration"""
stroke = Key(
True, bool, "Look",
"Line dots (set it to false to get a scatter plot)")
show_dots = Key(True, bool, "Look", "Set to false to remove dots")
show_only_major_dots = Key(
False, bool, "Look",
"Set to true to show only major dots according to their majored label")
dots_size = Key(2.5, float, "Look", "Radius of the dots")
fill = Key(
False, bool, "Look", "Fill areas under lines")
stroke_style = Key(None, dict, "Look", "Stroke style of serie element.",
"This is a dict which can contain a "
"'width', 'linejoin', 'linecap', 'dasharray' "
"and 'dashoffset'")
rounded_bars = Key(
None, int, "Look",
"Set this to the desired radius in px (for Bar-like charts)")
inner_radius = Key(
0, float, "Look", "Piechart inner radius (donut), must be <.9")
allow_interruptions = Key(
False, bool, "Look", "Break lines on None values")
formatter = Key(
None, callable, "Value",
"A function to convert raw value to strings for this chart or serie",
"Default to value_formatter in most charts, it depends on dual charts."
"(Can be overriden by value with the formatter metadata.)")
class Config(CommonConfig):
"""Class holding config values"""
style = Key(
DefaultStyle, Style, "Style", "Style holding values injected in css")
css = Key(
('file://style.css', 'file://graph.css'), list, "Style",
"List of css file",
"It can be any uri from file:///tmp/style.css to //domain/style.css",
str)
classes = Key(
('pygal-chart',),
list, "Style", "Classes of the root svg node",
str)
defs = Key(
[],
list, "Misc", "Extraneous defs to be inserted in svg",
"Useful for adding gradients / patterns…",
str)
# Look #
title = Key(
None, str, "Look",
"Graph title.", "Leave it to None to disable title.")
x_title = Key(
None, str, "Look",
"Graph X-Axis title.", "Leave it to None to disable X-Axis title.")
y_title = Key(
None, str, "Look",
"Graph Y-Axis title.", "Leave it to None to disable Y-Axis title.")
width = Key(
800, int, "Look", "Graph width")
height = Key(
600, int, "Look", "Graph height")
show_x_guides = Key(False, bool, "Look",
"Set to true to always show x guide lines")
show_y_guides = Key(True, bool, "Look",
"Set to false to hide y guide lines")
show_legend = Key(
True, bool, "Look", "Set to false to remove legend")
legend_at_bottom = Key(
False, bool, "Look", "Set to true to position legend at bottom")
legend_at_bottom_columns = Key(
None, int, "Look", "Set to true to position legend at bottom")
legend_box_size = Key(
12, int, "Look", "Size of legend boxes")
rounded_bars = Key(
None, int, "Look", "Set this to the desired radius in px")
stack_from_top = Key(
False, bool, "Look", "Stack from top to zero, this makes the stacked "
"data match the legend order")
spacing = Key(
10, int, "Look",
"Space between titles/legend/axes")
margin = Key(
20, int, "Look",
"Margin around chart")
margin_top = Key(
None, int, "Look",
"Margin around top of chart")
margin_right = Key(
None, int, "Look",
"Margin around right of chart")
margin_bottom = Key(
None, int, "Look",
"Margin around bottom of chart")
margin_left = Key(
None, int, "Look",
"Margin around left of chart")
tooltip_border_radius = Key(0, int, "Look", "Tooltip border radius")
tooltip_fancy_mode = Key(
True, bool, "Look", "Fancy tooltips",
"Print legend, x label in tooltip and use serie color for value.")
inner_radius = Key(
0, float, "Look", "Piechart inner radius (donut), must be <.9")
half_pie = Key(
False, bool, "Look", "Create a half-pie chart")
x_labels = Key(
None, list, "Label",
"X labels, must have same len than data.",
"Leave it to None to disable x labels display.",
str)
x_labels_major = Key(
None, list, "Label",
"X labels that will be marked major.",
subtype=str)
x_labels_major_every = Key(
None, int, "Label",
"Mark every n-th x label as major.")
x_labels_major_count = Key(
None, int, "Label",
"Mark n evenly distributed labels as major.")
show_x_labels = Key(
True, bool, "Label", "Set to false to hide x-labels")
show_minor_x_labels = Key(
True, bool, "Label", "Set to false to hide x-labels not marked major")
y_labels = Key(
None, list, "Label",
"You can specify explicit y labels",
"Must be a list of numbers", float)
y_labels_major = Key(
None, list, "Label",
"Y labels that will be marked major. Default: auto",
subtype=str)
y_labels_major_every = Key(
None, int, "Label",
"Mark every n-th y label as major.")
y_labels_major_count = Key(
None, int, "Label",
"Mark n evenly distributed y labels as major.")
show_minor_y_labels = Key(
True, bool, "Label", "Set to false to hide y-labels not marked major")
show_y_labels = Key(
True, bool, "Label", "Set to false to hide y-labels")
x_label_rotation = Key(
0, int, "Label", "Specify x labels rotation angles", "in degrees")
y_label_rotation = Key(
0, int, "Label", "Specify y labels rotation angles", "in degrees")
missing_value_fill_truncation = Key(
"x", str, "Look",
"Filled series with missing x and/or y values at the end of a series "
"are closed at the first value with a missing "
"'x' (default), 'y' or 'either'")
# Value #
x_value_formatter = Key(
formatters.default, callable, "Value",
"A function to convert abscissa numeric value to strings "
"(used in XY and Date charts)")
value_formatter = Key(
formatters.default, callable, "Value",
"A function to convert ordinate numeric value to strings")
logarithmic = Key(
False, bool, "Value", "Display values in logarithmic scale")
interpolate = Key(
None, str, "Value", "Interpolation",
"May be %s" % ' or '.join(INTERPOLATIONS))
interpolation_precision = Key(
250, int, "Value", "Number of interpolated points between two values")
interpolation_parameters = Key(
{}, dict, "Value", "Various parameters for parametric interpolations",
"ie: For hermite interpolation, you can set the cardinal tension with"
"{'type': 'cardinal', 'c': .5}", int)
box_mode = Key(
'extremes', str, "Value", "Sets the mode to be used. "
"(Currently only supported on box plot)",
"May be %s" % ' or '.join([
"1.5IQR", "extremes", "tukey", "stdev", "pstdev"]))
order_min = Key(
None, int, "Value",
"Minimum order of scale, defaults to None")
min_scale = Key(
4, int, "Value",
"Minimum number of scale graduation for auto scaling")
max_scale = Key(
16, int, "Value",
"Maximum number of scale graduation for auto scaling")
range = Key(
None, list, "Value", "Explicitly specify min and max of values",
"(ie: (0, 100))", int)
secondary_range = Key(
None, list, "Value",
"Explicitly specify min and max of secondary values",
"(ie: (0, 100))", int)
xrange = Key(
None, list, "Value", "Explicitly specify min and max of x values "
"(used in XY and Date charts)",
"(ie: (0, 100))", int)
include_x_axis = Key(
False, bool, "Value", "Always include x axis")
zero = Key(
0, int, "Value",
"Set the ordinate zero value",
"Useful for filling to another base than abscissa")
# Text #
no_data_text = Key(
"No data", str, "Text", "Text to display when no data is given")
print_values = Key(
False, bool,
"Text", "Display values as text over plot")
dynamic_print_values = Key(
False, bool,
"Text", "Show values only on hover")
print_values_position = Key(
'center', str,
"Text", "Customize position of `print_values`. "
"(For bars: `top`, `center` or `bottom`)")
print_zeroes = Key(
True, bool,
"Text", "Display zero values as well")
print_labels = Key(
False, bool,
"Text", "Display value labels")
truncate_legend = Key(
None, int, "Text",
"Legend string length truncation threshold",
"None = auto, Negative for none")
truncate_label = Key(
None, int, "Text",
"Label string length truncation threshold",
"None = auto, Negative for none")
# Misc #
js = Key(
('//kozea.github.io/pygal.js/2.0.x/pygal-tooltips.min.js',),
list, "Misc", "List of js file",
"It can be any uri from file:///tmp/ext.js to //domain/ext.js",
str)
disable_xml_declaration = Key(
False, bool, "Misc",
"Don't write xml declaration and return str instead of string",
"useful for writing output directly in html")
force_uri_protocol = Key(
'https', str, "Misc",
"Default uri protocol",
"Default protocol for external files. "
"Can be set to None to use a // uri")
explicit_size = Key(
False, bool, "Misc", "Write width and height attributes")
pretty_print = Key(
False, bool, "Misc", "Pretty print the svg")
strict = Key(
False, bool, "Misc",
"If True don't try to adapt / filter wrong values")
no_prefix = Key(
False, bool, "Misc",
"Don't prefix css")
inverse_y_axis = Key(False, bool, "Misc", "Inverse Y axis direction")
class SerieConfig(CommonConfig):
"""Class holding serie config values"""
title = Key(
None, str, "Look",
"Serie title.", "Leave it to None to disable title.")
secondary = Key(
False, bool, "Misc",
"Set it to put the serie in a second axis")