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# -*- 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 <http://www.gnu.org/licenses/>.
"""
Dot chart displaying values as a grid of dots, the bigger the value
the bigger the dot
"""
from math import log10
from pygal.graph.graph import Graph
from pygal.util import alter, cached_property, decorate, safe_enumerate
from pygal.view import ReverseView, View
class Dot(Graph):
"""Dot graph class"""
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):
if self.y_labels:
y_labels = [str(label) for label in self.y_labels]
else:
y_labels = [
(
serie.title['title']
if isinstance(serie.title, dict)
else serie.title
) or ''
for serie in self.series
]
self._y_labels = list(zip(y_labels, 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:
self.dot(serie, r_max)
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