/usr/lib/python2.7/dist-packages/pygal/svg.py is in python-pygal 2.4.0-1.
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# 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/>.
"""Svg helper"""
from __future__ import division
import io
import json
import os
from datetime import date, datetime
from math import pi
from numbers import Number
from pygal import __version__
from pygal._compat import quote_plus, to_str, u
from pygal.etree import etree
from pygal.util import (
coord_abs_project, coord_diff, coord_dual, coord_format, coord_project,
minify_css, template)
nearly_2pi = 2 * pi - .00001
class Svg(object):
"""Svg related methods"""
ns = 'http://www.w3.org/2000/svg'
xlink_ns = 'http://www.w3.org/1999/xlink'
def __init__(self, graph):
"""Create the svg helper with the chart instance"""
self.graph = graph
if not graph.no_prefix:
self.id = '#chart-%s ' % graph.uuid
else:
self.id = ''
self.processing_instructions = []
if etree.lxml:
attrs = {
'nsmap': {
None: self.ns,
'xlink': self.xlink_ns
}
}
else:
attrs = {
'xmlns': self.ns
}
if hasattr(etree, 'register_namespace'):
etree.register_namespace('xlink', self.xlink_ns)
else:
etree._namespace_map[self.xlink_ns] = 'xlink'
self.root = etree.Element('svg', **attrs)
self.root.attrib['id'] = self.id.lstrip('#').rstrip()
if graph.classes:
self.root.attrib['class'] = ' '.join(graph.classes)
self.root.append(
etree.Comment(u(
'Generated with pygal %s (%s) ©Kozea 2012-2016 on %s' % (
__version__,
'lxml' if etree.lxml else 'etree',
date.today().isoformat()))))
self.root.append(etree.Comment(u('http://pygal.org')))
self.root.append(etree.Comment(u('http://github.com/Kozea/pygal')))
self.defs = self.node(tag='defs')
self.title = self.node(tag='title')
self.title.text = graph.title or 'Pygal'
for def_ in self.graph.defs:
self.defs.append(etree.fromstring(def_))
def add_styles(self):
"""Add the css to the svg"""
colors = self.graph.style.get_colors(self.id, self.graph._order)
strokes = self.get_strokes()
all_css = []
auto_css = ['file://base.css']
if self.graph.style._google_fonts:
auto_css.append(
'//fonts.googleapis.com/css?family=%s' % quote_plus(
'|'.join(self.graph.style._google_fonts))
)
for css in auto_css + list(self.graph.css):
css_text = None
if css.startswith('inline:'):
css_text = css[len('inline:'):]
elif css.startswith('file://'):
css = css[len('file://'):]
if not os.path.exists(css):
css = os.path.join(
os.path.dirname(__file__), 'css', css)
with io.open(css, encoding='utf-8') as f:
css_text = template(
f.read(),
style=self.graph.style,
colors=colors,
strokes=strokes,
id=self.id)
if css_text is not None:
if not self.graph.pretty_print:
css_text = minify_css(css_text)
all_css.append(css_text)
else:
if css.startswith('//') and self.graph.force_uri_protocol:
css = '%s:%s' % (self.graph.force_uri_protocol, css)
self.processing_instructions.append(
etree.PI(
u('xml-stylesheet'), u('href="%s"' % css)))
self.node(
self.defs, 'style', type='text/css').text = '\n'.join(all_css)
def add_scripts(self):
"""Add the js to the svg"""
common_script = self.node(self.defs, 'script', type='text/javascript')
def get_js_dict():
return dict(
(k, getattr(self.graph.state, k))
for k in dir(self.graph.config)
if not k.startswith('_') and hasattr(self.graph.state, k) and
not hasattr(getattr(self.graph.state, k), '__call__'))
def json_default(o):
if isinstance(o, (datetime, date)):
return o.isoformat()
if hasattr(o, 'to_dict'):
return o.to_dict()
return json.JSONEncoder().default(o)
dct = get_js_dict()
# Config adds
dct['legends'] = [
l.get('title') if isinstance(l, dict) else l
for l in self.graph._legends + self.graph._secondary_legends]
common_js = 'window.pygal = window.pygal || {};'
common_js += 'window.pygal.config = window.pygal.config || {};'
if self.graph.no_prefix:
common_js += 'window.pygal.config = '
else:
common_js += 'window.pygal.config[%r] = ' % self.graph.uuid
common_script.text = common_js + json.dumps(dct, default=json_default)
for js in self.graph.js:
if js.startswith('file://'):
script = self.node(self.defs, 'script', type='text/javascript')
with io.open(js[len('file://'):], encoding='utf-8') as f:
script.text = f.read()
else:
if js.startswith('//') and self.graph.force_uri_protocol:
js = '%s:%s' % (self.graph.force_uri_protocol, js)
self.node(self.defs, 'script', type='text/javascript', href=js)
def node(self, parent=None, tag='g', attrib=None, **extras):
"""Make a new svg node"""
if parent is None:
parent = self.root
attrib = attrib or {}
attrib.update(extras)
def in_attrib_and_number(key):
return key in attrib and isinstance(attrib[key], Number)
for pos, dim in (('x', 'width'), ('y', 'height')):
if in_attrib_and_number(dim) and attrib[dim] < 0:
attrib[dim] = - attrib[dim]
if in_attrib_and_number(pos):
attrib[pos] = attrib[pos] - attrib[dim]
for key, value in dict(attrib).items():
if value is None:
del attrib[key]
attrib[key] = to_str(value)
if key.endswith('_'):
attrib[key.rstrip('_')] = attrib[key]
del attrib[key]
elif key == 'href':
attrib[etree.QName(
'http://www.w3.org/1999/xlink', key)] = attrib[key]
del attrib[key]
return etree.SubElement(parent, tag, attrib)
def transposable_node(self, parent=None, tag='g', attrib=None, **extras):
"""Make a new svg node which can be transposed if horizontal"""
if self.graph.horizontal:
for key1, key2 in (('x', 'y'), ('width', 'height'), ('cx', 'cy')):
attr1 = extras.get(key1, None)
attr2 = extras.get(key2, None)
if attr2:
extras[key1] = attr2
elif attr1:
del extras[key1]
if attr1:
extras[key2] = attr1
elif attr2:
del extras[key2]
return self.node(parent, tag, attrib, **extras)
def serie(self, serie):
"""Make serie node"""
return dict(
plot=self.node(
self.graph.nodes['plot'],
class_='series serie-%d color-%d' % (
serie.index, serie.index)),
overlay=self.node(
self.graph.nodes['overlay'],
class_='series serie-%d color-%d' % (
serie.index, serie.index)),
text_overlay=self.node(
self.graph.nodes['text_overlay'],
class_='series serie-%d color-%d' % (
serie.index, serie.index)))
def line(self, node, coords, close=False, **kwargs):
"""Draw a svg line"""
line_len = len(coords)
if len([c for c in coords if c[1] is not None]) < 2:
return
root = 'M%s L%s Z' if close else 'M%s L%s'
origin_index = 0
while origin_index < line_len and None in coords[origin_index]:
origin_index += 1
if origin_index == line_len:
return
if self.graph.horizontal:
coord_format = lambda xy: '%f %f' % (xy[1], xy[0])
else:
coord_format = lambda xy: '%f %f' % xy
origin = coord_format(coords[origin_index])
line = ' '.join([coord_format(c)
for c in coords[origin_index + 1:]
if None not in c])
return self.node(
node, 'path', d=root % (origin, line), **kwargs)
def slice(
self, serie_node, node, radius, small_radius,
angle, start_angle, center, val, i, metadata):
"""Draw a pie slice"""
if angle == 2 * pi:
angle = nearly_2pi
if angle > 0:
to = [coord_abs_project(center, radius, start_angle),
coord_abs_project(center, radius, start_angle + angle),
coord_abs_project(center, small_radius, start_angle + angle),
coord_abs_project(center, small_radius, start_angle)]
rv = self.node(
node, 'path',
d='M%s A%s 0 %d 1 %s L%s A%s 0 %d 0 %s z' % (
to[0],
coord_dual(radius), int(angle > pi), to[1],
to[2],
coord_dual(small_radius), int(angle > pi), to[3]),
class_='slice reactive tooltip-trigger')
else:
rv = None
x, y = coord_diff(center, coord_project(
(radius + small_radius) / 2, start_angle + angle / 2))
self.graph._tooltip_data(
node, val, x, y, "centered",
self.graph._x_labels and self.graph._x_labels[i][0])
if angle >= 0.3: # 0.3 radians is about 17 degrees
self.graph._static_value(serie_node, val, x, y, metadata)
return rv
def gauge_background(
self, serie_node, start_angle, center, radius, small_radius,
end_angle, half_pie, max_value):
if end_angle == 2 * pi:
end_angle = nearly_2pi
to_shade = [
coord_abs_project(center, radius, start_angle),
coord_abs_project(center, radius, end_angle),
coord_abs_project(center, small_radius, end_angle),
coord_abs_project(center, small_radius, start_angle)]
self.node(
serie_node['plot'], 'path',
d='M%s A%s 0 1 1 %s L%s A%s 0 1 0 %s z' % (
to_shade[0],
coord_dual(radius),
to_shade[1],
to_shade[2],
coord_dual(small_radius),
to_shade[3]),
class_='gauge-background reactive')
if half_pie:
begin_end = [
coord_diff(
center,
coord_project(
radius - (radius - small_radius) / 2, start_angle)),
coord_diff(
center,
coord_project(
radius - (radius - small_radius) / 2, end_angle))]
pos = 0
for i in begin_end:
self.node(
serie_node['plot'], 'text',
class_='y-{} bound reactive'.format(pos),
x=i[0],
y=i[1] + 10,
attrib={'text-anchor': 'middle'}
).text = '{}'.format(0 if pos == 0 else max_value)
pos += 1
else:
middle_radius = .5 * (radius + small_radius)
# Correct text vertical alignment
middle_radius -= .1 * (radius - small_radius)
to_labels = [
coord_abs_project(
center, middle_radius, 0),
coord_abs_project(
center, middle_radius, nearly_2pi)
]
self.node(
self.defs, 'path', id='valuePath-%s%s' % center,
d='M%s A%s 0 1 1 %s' % (
to_labels[0],
coord_dual(middle_radius),
to_labels[1]
))
text_ = self.node(
serie_node['text_overlay'], 'text')
self.node(
text_, 'textPath', class_='max-value reactive',
attrib={
'href': '#valuePath-%s%s' % center,
'startOffset': '99%',
'text-anchor': 'end'
}
).text = max_value
def solid_gauge(
self, serie_node, node, radius, small_radius,
angle, start_angle, center, val, i, metadata, half_pie, end_angle,
max_value):
"""Draw a solid gauge slice and background slice"""
if angle == 2 * pi:
angle = nearly_2pi
if angle > 0:
to = [coord_abs_project(center, radius, start_angle),
coord_abs_project(center, radius, start_angle + angle),
coord_abs_project(center, small_radius, start_angle + angle),
coord_abs_project(center, small_radius, start_angle)]
self.node(
node, 'path',
d='M%s A%s 0 %d 1 %s L%s A%s 0 %d 0 %s z' % (
to[0],
coord_dual(radius),
int(angle > pi),
to[1],
to[2],
coord_dual(small_radius),
int(angle > pi),
to[3]),
class_='slice reactive tooltip-trigger')
else:
return
x, y = coord_diff(center, coord_project(
(radius + small_radius) / 2, start_angle + angle / 2))
self.graph._static_value(serie_node, val, x, y, metadata, 'middle')
self.graph._tooltip_data(
node, val, x, y, "centered",
self.graph._x_labels and self.graph._x_labels[i][0])
def confidence_interval(self, node, x, low, high, width=7):
if self.graph.horizontal:
fmt = lambda xy: '%f %f' % (xy[1], xy[0])
else:
fmt = coord_format
shr = lambda xy: (xy[0] + width, xy[1])
shl = lambda xy: (xy[0] - width, xy[1])
top = (x, high)
bottom = (x, low)
ci = self.node(node, class_="ci")
self.node(
ci, 'path', d="M%s L%s M%s L%s M%s L%s L%s M%s L%s" % tuple(
map(fmt, (
top, shr(top), top, shl(top), top,
bottom, shr(bottom), bottom, shl(bottom)
))
), class_='nofill reactive'
)
def pre_render(self):
"""Last things to do before rendering"""
self.add_styles()
self.add_scripts()
self.root.set(
'viewBox', '0 0 %d %d' % (self.graph.width, self.graph.height))
if self.graph.explicit_size:
self.root.set('width', str(self.graph.width))
self.root.set('height', str(self.graph.height))
def draw_no_data(self):
"""Write the no data text to the svg"""
no_data = self.node(self.graph.nodes['text_overlay'], 'text',
x=self.graph.view.width / 2,
y=self.graph.view.height / 2,
class_='no_data')
no_data.text = self.graph.no_data_text
def render(self, is_unicode=False, pretty_print=False):
"""Last thing to do before rendering"""
for f in self.graph.xml_filters:
self.root = f(self.root)
args = {
'encoding': 'utf-8'
}
svg = b''
if etree.lxml:
args['pretty_print'] = pretty_print
if not self.graph.disable_xml_declaration:
svg = b"<?xml version='1.0' encoding='utf-8'?>\n"
if not self.graph.disable_xml_declaration:
svg += b'\n'.join(
[etree.tostring(
pi, **args)
for pi in self.processing_instructions]
)
svg += etree.tostring(
self.root, **args)
if self.graph.disable_xml_declaration or is_unicode:
svg = svg.decode('utf-8')
return svg
def get_strokes(self):
"""Return a css snippet containing all stroke style options"""
def stroke_dict_to_css(stroke, i=None):
"""Return a css style for the given option"""
css = ['%s.series%s {\n' % (
self.id, '.serie-%d' % i if i is not None else '')]
for key in (
'width', 'linejoin', 'linecap',
'dasharray', 'dashoffset'):
if stroke.get(key):
css.append(' stroke-%s: %s;\n' % (
key, stroke[key]))
css.append('}')
return '\n'.join(css)
css = []
if self.graph.stroke_style is not None:
css.append(stroke_dict_to_css(self.graph.stroke_style))
for serie in self.graph.series:
if serie.stroke_style is not None:
css.append(stroke_dict_to_css(serie.stroke_style, serie.index))
for secondary_serie in self.graph.secondary_series:
if secondary_serie.stroke_style is not None:
css.append(stroke_dict_to_css(secondary_serie.stroke_style, secondary_serie.index))
return '\n'.join(css)
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