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Jean-Marc Martins 11 years ago
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  1. 208
      pygal/graph/#box.py#
  2. 87
      pygal/graph/#pie.py#

208
pygal/graph/#box.py#
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# -*- coding: utf-8 -*-
# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2014 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/>.
"""
Box plot
"""
from __future__ import division
from pygal.graph.graph import Graph
from pygal.util import compute_scale, decorate
from pygal._compat import is_list_like
class Box(Graph):
"""
Box plot
For each series, shows the median value, the 25th and 75th percentiles,
and the values within
1.5 times the interquartile range of the 25th and 75th percentiles.
See http://en.wikipedia.org/wiki/Box_plot
"""
_series_margin = .06
def __init__(self, *args, **kwargs):
super(Box, self).__init__(*args, **kwargs)
@property
def _format(self):
"""Return the value formatter for this graph"""
sup = super(Box, self)._format
def format_maybe_quartile(x):
if is_list_like(x):
if len(x) == 5:
return 'Q1: %s Q2: %s Q3: %s' % tuple(map(sup, x[1:4]))
else:
return sup(x)
return format_maybe_quartile
def _compute(self):
"""
Compute parameters necessary for later steps
within the rendering process
"""
for serie in self.series:
serie.values = self._box_points(serie.values)
if self._min:
self._box.ymin = min(self._min, self.zero)
if self._max:
self._box.ymax = max(self._max, self.zero)
x_pos = [
x / self._len for x in range(self._len + 1)
] if self._len > 1 else [0, 1] # Center if only one value
self._points(x_pos)
y_pos = compute_scale(
self._box.ymin, self._box.ymax, self.logarithmic, self.order_min
) if not self.y_labels else list(map(float, self.y_labels))
self._x_labels = self.x_labels and list(zip(self.x_labels, [
(i + .5) / self._order for i in range(self._order)]))
self._y_labels = list(zip(map(self._format, y_pos), y_pos))
def _plot(self):
"""
Plot the series data
"""
for index, serie in enumerate(self.series):
self._boxf(self._serie(index), serie, index)
def _boxf(self, serie_node, serie, index):
"""
For a specific series, draw the box plot.
"""
# Note: q0 and q4 do not literally mean the zero-th quartile
# and the fourth quartile, but rather the distance from 1.5 times
# the inter-quartile range to Q1 and Q3, respectively.
boxes = self.svg.node(serie_node['plot'], class_="boxes")
metadata = serie.metadata.get(0)
box = decorate(
self.svg,
self.svg.node(boxes, class_='box'),
metadata)
val = self._format(serie.values)
x_center, y_center = self._draw_box(box, serie.values, index)
self._tooltip_data(box, val, x_center, y_center, classes="centered")
self._static_value(serie_node, val, x_center, y_center)
def _draw_box(self, parent_node, quartiles, box_index):
"""
Return the center of a bounding box defined by a box plot.
Draws a box plot on self.svg.
"""
width = (self.view.x(1) - self.view.x(0)) / self._order
series_margin = width * self._series_margin
left_edge = self.view.x(0) + width * box_index + series_margin
width -= 2 * series_margin
# draw lines for whiskers - bottom, median, and top
for i, whisker in enumerate(
(quartiles[0], quartiles[2], quartiles[4])):
whisker_width = width if i == 1 else width / 2
shift = (width - whisker_width) / 2
xs = left_edge + shift
xe = left_edge + width - shift
self.svg.line(
parent_node,
coords=[(xs, self.view.y(whisker)),
(xe, self.view.y(whisker))],
class_='reactive tooltip-trigger',
attrib={'stroke-width': 3})
# draw lines connecting whiskers to box (Q1 and Q3)
self.svg.line(
parent_node,
coords=[(left_edge + width / 2, self.view.y(quartiles[0])),
(left_edge + width / 2, self.view.y(quartiles[1]))],
class_='reactive tooltip-trigger',
attrib={'stroke-width': 2})
self.svg.line(
parent_node,
coords=[(left_edge + width / 2, self.view.y(quartiles[4])),
(left_edge + width / 2, self.view.y(quartiles[3]))],
class_='reactive tooltip-trigger',
attrib={'stroke-width': 2})
# box, bounded by Q1 and Q3
self.svg.node(
parent_node,
tag='rect',
x=left_edge,
y=self.view.y(quartiles[1]),
height=self.view.y(quartiles[3]) - self.view.y(quartiles[1]),
width=width,
class_='subtle-fill reactive tooltip-trigger')
return (left_edge + width / 2, self.view.y(
sum(quartiles) / len(quartiles)))
@staticmethod
def _box_points(values):
"""
Return a 5-tuple of Q1 - 1.5 * IQR, Q1, Median, Q3,
and Q3 + 1.5 * IQR for a list of numeric values.
The iterator values may include None values.
Uses quartile definition from Mendenhall, W. and
Sincich, T. L. Statistics for Engineering and the
Sciences, 4th ed. Prentice-Hall, 1995.
"""
def median(seq):
n = len(seq)
if n % 2 == 0: # seq has an even length
return (seq[n // 2] + seq[n // 2 - 1]) / 2
else: # seq has an odd length
return seq[n // 2]
# sort the copy in case the originals must stay in original order
s = sorted([x for x in values if x is not None])
n = len(s)
if not n:
return 0, 0, 0, 0, 0
else:
q2 = median(s)
# See 'Method 3' in http://en.wikipedia.org/wiki/Quartile
if n % 2 == 0: # even
q1 = median(s[:n // 2])
q3 = median(s[n // 2:])
else: # odd
if n == 1: # special case
q1 = s[0]
q3 = s[0]
elif n % 4 == 1: # n is of form 4n + 1 where n >= 1
m = (n - 1) // 4
q1 = 0.25 * s[m-1] + 0.75 * s[m]
q3 = 0.75 * s[3*m] + 0.25 * s[3*m + 1]
else: # n is of form 4n + 3 where n >= 1
m = (n - 3) // 4
q1 = 0.75 * s[m] + 0.25 * s[m+1]
q3 = 0.25 * s[3*m+1] + 0.75 * s[3*m+2]
iqr = q3 - q1
q0 = q1 - 1.5 * iqr
q4 = q3 + 1.5 * iqr
return q0, q1, q2, q3, q4

87
pygal/graph/#pie.py#
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# -*- coding: utf-8 -*-
# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2014 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/>.
"""
Pie chart
"""
from __future__ import division
from pygal.util import decorate
from pygal.graph.graph import Graph
from pygal.adapters import positive, none_to_zero
from math import pi
class Pie(Graph):
"""Pie graph"""
_adapters = [positive, none_to_zero]
def slice(self, serie_node, start_angle, serie, total):
"""Make a serie slice"""
dual = self._len > 1 and not self._order == 1
slices = self.svg.node(serie_node['plot'], class_="slices")
serie_angle = 0
total_perc = 0
original_start_angle = start_angle
center = ((self.width - self.margin.x) / 2.,
(self.height - self.margin.y) / 2.)
radius = min(center)
for i, val in enumerate(serie.values):
perc = val / total
angle = 2 * pi * perc
serie_angle += angle
val = '{0:.2%}'.format(perc)
metadata = serie.metadata.get(i)
slice_ = decorate(
self.svg,
self.svg.node(slices, class_="slice"),
metadata)
if dual:
small_radius = radius * .9
big_radius = radius
else:
big_radius = radius * .9
small_radius = radius * self.config.inner_radius
self.svg.slice(
serie_node, slice_, big_radius, small_radius,
angle, start_angle, center, val)
start_angle += angle
total_perc += perc
if dual:
val = '{0:.2%}'.format(total_perc)
self.svg.slice(serie_node,
self.svg.node(slices, class_="big_slice"),
radius * .9, 0, serie_angle,
original_start_angle, center, val)
return serie_angle
def _plot(self):
total = sum(map(sum, map(lambda x: x.values, self.series)))
if total == 0:
return
current_angle = 0
for index, serie in enumerate(self.series):
angle = self.slice(
self._serie(index), current_angle, serie, total)
current_angle += angle
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