Source code for

# -*- 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 <>.

Dot chart displaying values as a grid of dots, the bigger the value
the bigger the dot

from __future__ import division

from math import log10

from pygal._compat import to_str
from pygal.graph.graph import Graph
from pygal.util import alter, cached_property, decorate, safe_enumerate
from pygal.view import ReverseView, View

[docs]class Dot(Graph): """Dot graph class"""
[docs] def dot(self, serie, r_max): """Draw a dot line""" serie_node = self.svg.serie(serie) view_values = list(map(self.view, serie.points)) for i, value in safe_enumerate(serie.values): x, y = view_values[i] if self.logarithmic: log10min = log10(self._min) - 1 log10max = log10(self._max or 1) if value != 0: size = r_max * ( (log10(abs(value)) - log10min) / (log10max - log10min) ) else: size = 0 else: size = r_max * (abs(value) / (self._max or 1)) metadata = serie.metadata.get(i) dots = decorate( self.svg, self.svg.node(serie_node['plot'], class_="dots"), metadata) alter(self.svg.node( dots, 'circle', cx=x, cy=y, r=size, class_='dot reactive tooltip-trigger' + ( ' negative' if value < 0 else '')), metadata) val = self._format(serie, i) self._tooltip_data( dots, val, x, y, 'centered', self._get_x_label(i)) self._static_value(serie_node, val, x, y, metadata)
def _compute(self): """Compute y min and max and y scale and set labels""" x_len = self._len y_len = self._order self._box.xmax = x_len self._box.ymax = y_len self._x_pos = [n / 2 for n in range(1, 2 * x_len, 2)] self._y_pos = [n / 2 for n in reversed(range(1, 2 * y_len, 2))] for j, serie in enumerate(self.series): serie.points = [ (self._x_pos[i], self._y_pos[j]) for i in range(x_len)] def _compute_y_labels(self): self._y_labels = list(zip( self.y_labels and map(to_str, self.y_labels) or [ serie.title['title'] if isinstance(serie.title, dict) else serie.title or '' for serie in self.series], self._y_pos)) def _set_view(self): """Assign a view to current graph""" view_class = ReverseView if self.inverse_y_axis else View self.view = view_class( self.width - self.margin_box.x, self.height - self.margin_box.y, self._box) @cached_property def _values(self): """Getter for series values (flattened)""" return [abs(val) for val in super(Dot, self)._values if val != 0] @cached_property def _max(self): """Getter for the maximum series value""" return (self.range[1] if (self.range and self.range[1] is not None) else (max(map(abs, self._values)) if self._values else None)) def _plot(self): """Plot all dots for series""" r_max = min( self.view.x(1) - self.view.x(0), (self.view.y(0) or 0) - self.view.y(1)) / ( 2 * 1.05) for serie in self.series:, r_max)