Python to generate nice looking SVG graph http://pygal.org/
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# -*- coding: utf-8 -*-
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# This file is part of pygal
#
# A python svg graph plotting library
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# Copyright © 2012-2013 Kozea
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#
# 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/>.
from flask import Flask, render_template
import pygal
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from pygal.config import Config
from pygal.util import cut
from pygal.graph import CHARTS_NAMES
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from pygal.style import styles
from base64 import (
urlsafe_b64encode as b64encode,
urlsafe_b64decode as b64decode)
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import string
import random
import pickle
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def random_label():
chars = string.letters + string.digits + u' àéèçêâäëï'
return ''.join(
[random.choice(chars)
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for i in range(random.randrange(4, 30))])
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def random_value(min=0, max=15):
return random.randrange(min, max, 1)
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def create_app():
"""Creates the pygal test web app"""
app = Flask(__name__)
def _random(data, order):
max = 10 ** order
min = 10 ** random.randrange(0, order)
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series = []
for i in range(random.randrange(1, 10)):
values = [(
random_value((-max, min)[random.randrange(0, 2)], max),
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random_value((-max, min)[random.randrange(0, 2)], max)
) for i in range(data)]
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series.append((random_label(), values))
return series
def _random_series(type, data, order):
max = 10 ** order
min = 10 ** random.randrange(0, order)
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series = []
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for i in range(random.randrange(1, 10)):
if type == 'Pie':
values = random_value(min, max)
elif type == 'XY':
values = [(
random_value((-max, min)[random.randrange(0, 2)], max),
random_value((-max, min)[random.randrange(0, 2)], max))
for i in range(data)]
else:
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values = [random_value((-max, min)[random.randrange(1, 2)],
max) for i in range(data)]
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series.append((random_label(), values))
return series
from .tests import get_test_routes
links = get_test_routes(app)
@app.route("/")
def index():
return render_template(
'index.jinja2', styles=styles,
links=links, charts_name=CHARTS_NAMES)
@app.route("/svg/<type>/<series>/<config>")
def svg(type, series, config):
graph = getattr(pygal, type)(pickle.loads(b64decode(str(config))))
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for title, values in pickle.loads(b64decode(str(series))):
graph.add(title, values)
return graph.render_response()
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@app.route("/all")
@app.route("/all/style=<style>")
@app.route("/all/interpolate=<interpolate>")
def all(style='default', interpolate=None):
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width, height = 600, 400
data = random.randrange(1, 10)
order = random.randrange(1, 10)
xy_series = _random(data, order)
other_series = []
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for title, values in xy_series:
other_series.append(
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(title, cut(values, 1)))
xy_series = b64encode(pickle.dumps(xy_series))
other_series = b64encode(pickle.dumps(other_series))
config = Config()
config.width = width
config.height = height
config.fill = bool(random.randrange(0, 2))
config.human_readable = True
config.interpolate = interpolate
config.style = styles[style]
config.x_labels = [random_label() for i in range(data)]
svgs = []
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for chart in pygal.CHARTS:
type = chart.__name__
svgs.append({'type': type,
'series': xy_series if type == 'XY' else other_series,
'config': b64encode(pickle.dumps(config))})
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return render_template('svgs.jinja2',
svgs=svgs,
width=width,
height=height)
@app.route("/rotation")
def rotation():
width, height = 375, 245
config = Config()
config.width = width
config.height = height
config.fill = True
config.style = styles['neon']
data = random.randrange(1, 10)
order = random.randrange(1, 10)
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series = b64encode(pickle.dumps(_random_series(type, data, order)))
labels = [random_label() for i in range(data)]
svgs = []
config.show_legend = bool(random.randrange(0, 2))
for angle in range(0, 91, 5):
config.title = "%d rotation" % angle
config.x_labels = labels
config.x_label_rotation = angle
svgs.append({'type': 'Bar',
'series': series,
'config': b64encode(pickle.dumps(config))})
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return render_template('svgs.jinja2',
svgs=svgs,
width=width,
height=height)
@app.route("/interpolation")
def interpolation():
width, height = 600, 400
config = Config()
config.width = width
config.height = height
config.fill = True
config.style = styles['neon']
data = random.randrange(1, 10)
order = random.randrange(1, 10)
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series = b64encode(pickle.dumps(_random_series(type, data, order)))
svgs = []
for interpolation in (
'linear', 'slinear', 'nearest', 'zero', 'quadratic', 'cubic',
'krogh', 'barycentric', 'univariate', 4, 5, 6, 7, 8):
config.title = "%s interpolation" % interpolation
config.interpolate = interpolation
svgs.append({'type': 'StackedLine',
'series': series,
'config': b64encode(pickle.dumps(config))})
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return render_template('svgs.jinja2',
svgs=svgs,
width=width,
height=height)
return app