Source code for pygal.graph.pyramid

# -*- 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 <>.

Pyramid chart: Stacked bar chart containing only positive values divided by two
axes, generally gender for age pyramid.

from __future__ import division

from pygal.adapters import positive
from pygal.graph.horizontal import HorizontalGraph
from pygal.graph.stackedbar import StackedBar

[docs]class VerticalPyramid(StackedBar): """Vertical Pyramid graph class""" _adapters = [positive] def _value_format(self, value): """Format value for dual value display.""" return super(VerticalPyramid, self)._value_format(value and abs(value)) def _get_separated_values(self, secondary=False): """Separate values between odd and even series stacked""" series = self.secondary_series if secondary else self.series positive_vals = map(sum, zip( *[serie.safe_values for index, serie in enumerate(series) if index % 2])) negative_vals = map(sum, zip( *[serie.safe_values for index, serie in enumerate(series) if not index % 2])) return list(positive_vals), list(negative_vals) def _compute_box(self, positive_vals, negative_vals): """Compute Y min and max""" max_ = max( max(positive_vals or []), max(negative_vals or [])) if self.range and self.range[0] is not None: self._box.ymin = self.range[0] else: self._box.ymin = - max_ if self.range and self.range[1] is not None: self._box.ymax = self.range[1] else: self._box.ymax = max_ def _pre_compute_secondary(self, positive_vals, negative_vals): """Compute secondary y min and max""" self._secondary_max = max(max(positive_vals), max(negative_vals)) self._secondary_min = - self._secondary_max def _bar(self, serie, parent, x, y, i, zero, secondary=False): """Internal stacking bar drawing function""" if serie.index % 2: y = -y return super(VerticalPyramid, self)._bar( serie, parent, x, y, i, zero, secondary)
[docs]class Pyramid(HorizontalGraph, VerticalPyramid): """Horizontal Pyramid graph class like the one used by age pyramid"""