112 lines
4.0 KiB
Python
112 lines
4.0 KiB
Python
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# -*- coding: utf-8 -*-
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# This file is part of pygal
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#
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# A python svg graph plotting library
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# Copyright © 2012-2016 Kozea
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#
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# This library is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option) any
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# later version.
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#
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# This library is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with pygal. If not, see <http://www.gnu.org/licenses/>.
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"""Funnel chart: Represent values as a funnel"""
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from __future__ import division
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from pygal.adapters import none_to_zero, positive
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from pygal.graph.graph import Graph
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from pygal.util import alter, cut, decorate
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class Funnel(Graph):
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"""Funnel graph class"""
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_adapters = [positive, none_to_zero]
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def _value_format(self, value):
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"""Format value for dual value display."""
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return super(Funnel, self)._value_format(value and abs(value))
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def funnel(self, serie):
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"""Draw a funnel slice"""
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serie_node = self.svg.serie(serie)
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fmt = lambda x: '%f %f' % x
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for i, poly in enumerate(serie.points):
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metadata = serie.metadata.get(i)
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val = self._format(serie, i)
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funnels = decorate(
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self.svg,
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self.svg.node(serie_node['plot'], class_="funnels"),
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metadata)
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alter(self.svg.node(
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funnels, 'polygon',
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points=' '.join(map(fmt, map(self.view, poly))),
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class_='funnel reactive tooltip-trigger'), metadata)
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# Poly center from label
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x, y = self.view((
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self._center(self._x_pos[serie.index]),
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sum([point[1] for point in poly]) / len(poly)))
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self._tooltip_data(
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funnels, val, x, y, 'centered',
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self._get_x_label(serie.index))
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self._static_value(serie_node, val, x, y, metadata)
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def _center(self, x):
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return x - 1 / (2 * self._order)
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def _compute(self):
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"""Compute y min and max and y scale and set labels"""
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self._x_pos = [
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(x + 1) / self._order for x in range(self._order)
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] if self._order != 1 else [.5] # Center if only one value
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previous = [[self.zero, self.zero] for i in range(self._len)]
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for i, serie in enumerate(self.series):
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y_height = - sum(serie.safe_values) / 2
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all_x_pos = [0] + self._x_pos
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serie.points = []
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for j, value in enumerate(serie.values):
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poly = []
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poly.append((all_x_pos[i], previous[j][0]))
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poly.append((all_x_pos[i], previous[j][1]))
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previous[j][0] = y_height
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y_height = previous[j][1] = y_height + value
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poly.append((all_x_pos[i + 1], previous[j][1]))
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poly.append((all_x_pos[i + 1], previous[j][0]))
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serie.points.append(poly)
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val_max = max(list(map(sum, cut(self.series, 'values'))) + [self.zero])
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self._box.ymin = -val_max
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self._box.ymax = val_max
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if self.range and self.range[0] is not None:
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self._box.ymin = self.range[0]
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if self.range and self.range[1] is not None:
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self._box.ymax = self.range[1]
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def _compute_x_labels(self):
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self._x_labels = list(
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zip(self.x_labels and
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map(self._x_format, self.x_labels) or [
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serie.title['title']
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if isinstance(serie.title, dict)
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else serie.title or '' for serie in self.series],
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map(self._center, self._x_pos)))
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def _plot(self):
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"""Plot the funnel"""
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for serie in self.series:
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self.funnel(serie)
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