Source code for pygal.graph.funnel

# -*- 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 <>.
"""Funnel chart: Represent values as a funnel"""

from __future__ import division

from pygal.adapters import none_to_zero, positive
from pygal.graph.graph import Graph
from pygal.util import alter, cut, decorate

[docs]class Funnel(Graph): """Funnel graph class""" _adapters = [positive, none_to_zero] def _value_format(self, value): """Format value for dual value display.""" return super(Funnel, self)._value_format(value and abs(value))
[docs] def funnel(self, serie): """Draw a funnel slice""" serie_node = self.svg.serie(serie) fmt = lambda x: '%f %f' % x for i, poly in enumerate(serie.points): metadata = serie.metadata.get(i) val = self._format(serie, i) funnels = decorate( self.svg, self.svg.node(serie_node['plot'], class_="funnels"), metadata) alter(self.svg.node( funnels, 'polygon', points=' '.join(map(fmt, map(self.view, poly))), class_='funnel reactive tooltip-trigger'), metadata) # Poly center from label x, y = self.view(( self._center(self._x_pos[serie.index]), sum([point[1] for point in poly]) / len(poly))) self._tooltip_data( funnels, val, x, y, 'centered', self._get_x_label(serie.index)) self._static_value(serie_node, val, x, y, metadata)
def _center(self, x): return x - 1 / (2 * self._order) def _compute(self): """Compute y min and max and y scale and set labels""" self._x_pos = [ (x + 1) / self._order for x in range(self._order) ] if self._order != 1 else [.5] # Center if only one value previous = [[,] for i in range(self._len)] for i, serie in enumerate(self.series): y_height = - sum(serie.safe_values) / 2 all_x_pos = [0] + self._x_pos serie.points = [] for j, value in enumerate(serie.values): poly = [] poly.append((all_x_pos[i], previous[j][0])) poly.append((all_x_pos[i], previous[j][1])) previous[j][0] = y_height y_height = previous[j][1] = y_height + value poly.append((all_x_pos[i + 1], previous[j][1])) poly.append((all_x_pos[i + 1], previous[j][0])) serie.points.append(poly) val_max = max(list(map(sum, cut(self.series, 'values'))) + []) self._box.ymin = -val_max self._box.ymax = val_max if self.range and self.range[0] is not None: self._box.ymin = self.range[0] if self.range and self.range[1] is not None: self._box.ymax = self.range[1] def _compute_x_labels(self): self._x_labels = list( zip(self.x_labels and map(self._x_format, self.x_labels) or [ serie.title['title'] if isinstance(serie.title, dict) else serie.title or '' for serie in self.series], map(self._center, self._x_pos))) def _plot(self): """Plot the funnel""" for serie in self.series: self.funnel(serie)