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# Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "VK scripts" project.
# For details, see https://github.com/egor-tensin/vk-scripts.
# Distributed under the MIT License.
import matplotlib.pyplot as plt
from matplotlib import ticker
import numpy as np
class BarChartBuilder:
_BAR_HEIGHT = .5
THICK_BAR_HEIGHT = _BAR_HEIGHT
THIN_BAR_HEIGHT = THICK_BAR_HEIGHT / 2
def __init__(self, labels_align_middle=True):
self._fig, self._ax = plt.subplots()
self.labels_align_middle = labels_align_middle
def set_title(self, title):
self._ax.set_title(title)
def _get_categories_axis(self):
return self._ax.get_yaxis()
def _get_values_axis(self):
return self._ax.get_xaxis()
def set_categories_axis_limits(self, start=None, end=None):
bottom, top = self._ax.get_ylim()
if start is not None:
bottom = start
if end is not None:
top = end
self._ax.set_ylim(bottom=bottom, top=top)
def set_values_axis_limits(self, start=None, end=None):
left, right = self._ax.get_xlim()
if start is not None:
left = start
if end is not None:
right = end
self._ax.set_xlim(left=left, right=right)
def enable_grid_for_categories(self):
self._get_categories_axis().grid()
def enable_grid_for_values(self):
self._get_values_axis().grid()
def get_categories_labels(self):
return self._get_categories_axis().get_ticklabels()
def get_values_labels(self):
return self._get_values_axis().get_ticklabels()
def hide_categories(self):
self._get_categories_axis().set_major_locator(ticker.NullLocator())
def set_value_label_formatter(self, fn):
self._get_values_axis().set_major_formatter(ticker.FuncFormatter(fn))
def any_values(self):
self._get_values_axis().set_major_locator(ticker.AutoLocator())
def only_integer_values(self):
self._get_values_axis().set_major_locator(ticker.MaxNLocator(integer=True))
@staticmethod
def set_property(*args, **kwargs):
plt.setp(*args, **kwargs)
def _set_size(self, inches, dim=0):
fig_size = self._fig.get_size_inches()
assert len(fig_size) == 2
fig_size[dim] = inches
self._fig.set_size_inches(fig_size, forward=True)
def set_width(self, inches):
self._set_size(inches)
def set_height(self, inches):
self._set_size(inches, dim=1)
def plot_bars(self, categories, values, bar_height=THICK_BAR_HEIGHT):
numof_bars = len(categories)
inches_per_bar = 2 * bar_height
categories_axis_max = inches_per_bar * numof_bars
if not numof_bars:
categories_axis_max += inches_per_bar
self.set_height(categories_axis_max)
self.set_categories_axis_limits(0, categories_axis_max)
if not numof_bars:
self.set_values_axis_limits(0, 1)
self.hide_categories()
return []
bar_offset = inches_per_bar / 2
bar_offsets = inches_per_bar * np.arange(numof_bars) + bar_offset
if self.labels_align_middle:
self._get_categories_axis().set_ticks(bar_offsets)
else:
self._get_categories_axis().set_ticks(bar_offsets - bar_offset)
self._get_categories_axis().set_ticklabels(categories)
bars = self._ax.barh(bar_offsets, values, align='center',
height=bar_height)
if min(values) >= 0:
self.set_values_axis_limits(start=0)
if np.isclose(max(values), 0.):
self.set_values_axis_limits(end=1)
elif max(values) < 0:
self.set_values_axis_limits(end=0)
return bars
@staticmethod
def show():
plt.show()
def save(self, path):
self._fig.savefig(path, bbox_inches='tight')
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--categories', nargs='*', metavar='LABEL',
default=[])
parser.add_argument('--values', nargs='*', metavar='N',
default=[], type=float)
parser.add_argument('--output', '-o', help='set output file path')
parser.add_argument('--align-middle', action='store_true',
dest='labels_align_middle',
help='align labels to the middle of the bars')
parser.add_argument('--integer-values', action='store_true',
dest='only_integer_values')
parser.add_argument('--any-values', action='store_false',
dest='only_integer_values')
parser.add_argument('--grid-categories', action='store_true')
parser.add_argument('--grid-values', action='store_true')
args = parser.parse_args()
if len(args.categories) < len(args.values):
parser.error('too many bar values')
if len(args.categories) > len(args.values):
args.values.extend([0.0] * (len(args.categories) - len(args.values)))
builder = BarChartBuilder(labels_align_middle=args.labels_align_middle)
if args.only_integer_values:
builder.only_integer_values()
else:
builder.any_values()
if args.grid_categories:
builder.enable_grid_for_categories()
if args.grid_values:
builder.enable_grid_for_values()
builder.plot_bars(args.categories, args.values)
if args.output is None:
builder.show()
else:
builder.save(args.output)
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