"""
pygooglechart - A complete Python wrapper for the Google Chart API
http://pygooglechart.slowchop.com/
Copyright 2007-2008 Gerald Kaszuba
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
"""
import os
import urllib
import urllib2
import math
import random
import re
import warnings
import copy
# Helper variables and functions
# -----------------------------------------------------------------------------
__version__ = '0.2.1'
__author__ = 'Gerald Kaszuba'
reo_colour = re.compile('^([A-Fa-f0-9]{2,2}){3,4}$')
def _check_colour(colour):
if not reo_colour.match(colour):
raise InvalidParametersException('Colours need to be in ' \
'RRGGBB or RRGGBBAA format. One of your colours has %s' % \
colour)
def _reset_warnings():
"""Helper function to reset all warnings. Used by the unit tests."""
globals()['__warningregistry__'] = None
# Exception Classes
# -----------------------------------------------------------------------------
class PyGoogleChartException(Exception):
pass
class DataOutOfRangeException(PyGoogleChartException):
pass
class UnknownDataTypeException(PyGoogleChartException):
pass
class NoDataGivenException(PyGoogleChartException):
pass
class InvalidParametersException(PyGoogleChartException):
pass
class BadContentTypeException(PyGoogleChartException):
pass
class AbstractClassException(PyGoogleChartException):
pass
class UnknownChartType(PyGoogleChartException):
pass
# Data Classes
# -----------------------------------------------------------------------------
class Data(object):
def __init__(self, data):
if type(self) == Data:
raise AbstractClassException('This is an abstract class')
self.data = data
@classmethod
def float_scale_value(cls, value, range):
lower, upper = range
assert(upper > lower)
scaled = (value - lower) * (float(cls.max_value) / (upper - lower))
return scaled
@classmethod
def clip_value(cls, value):
return max(0, min(value, cls.max_value))
@classmethod
def int_scale_value(cls, value, range):
return int(round(cls.float_scale_value(value, range)))
@classmethod
def scale_value(cls, value, range):
scaled = cls.int_scale_value(value, range)
clipped = cls.clip_value(scaled)
Data.check_clip(scaled, clipped)
return clipped
@staticmethod
def check_clip(scaled, clipped):
if clipped != scaled:
warnings.warn('One or more of of your data points has been '
'clipped because it is out of range.')
class SimpleData(Data):
max_value = 61
enc_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
def __repr__(self):
encoded_data = []
for data in self.data:
sub_data = []
for value in data:
if value is None:
sub_data.append('_')
elif value >= 0 and value <= self.max_value:
sub_data.append(SimpleData.enc_map[value])
else:
raise DataOutOfRangeException('cannot encode value: %d'
% value)
encoded_data.append(''.join(sub_data))
return 'chd=s:' + ','.join(encoded_data)
class TextData(Data):
max_value = 100
def __repr__(self):
encoded_data = []
for data in self.data:
sub_data = []
for value in data:
if value is None:
sub_data.append(-1)
elif value >= 0 and value <= self.max_value:
sub_data.append("%.1f" % float(value))
else:
raise DataOutOfRangeException()
encoded_data.append(','.join(sub_data))
return 'chd=t:' + '|'.join(encoded_data)
@classmethod
def scale_value(cls, value, range):
# use float values instead of integers because we don't need an encode
# map index
scaled = cls.float_scale_value(value, range)
clipped = cls.clip_value(scaled)
Data.check_clip(scaled, clipped)
return clipped
class ExtendedData(Data):
max_value = 4095
enc_map = \
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.'
def __repr__(self):
encoded_data = []
enc_size = len(ExtendedData.enc_map)
for data in self.data:
sub_data = []
for value in data:
if value is None:
sub_data.append('__')
elif value >= 0 and value <= self.max_value:
first, second = divmod(int(value), enc_size)
sub_data.append('%s%s' % (
ExtendedData.enc_map[first],
ExtendedData.enc_map[second]))
else:
raise DataOutOfRangeException( \
'Item #%i "%s" is out of range' % (data.index(value), \
value))
encoded_data.append(''.join(sub_data))
return 'chd=e:' + ','.join(encoded_data)
# Axis Classes
# -----------------------------------------------------------------------------
class Axis(object):
BOTTOM = 'x'
TOP = 't'
LEFT = 'y'
RIGHT = 'r'
TYPES = (BOTTOM, TOP, LEFT, RIGHT)
def __init__(self, axis_index, axis_type, **kw):
assert(axis_type in Axis.TYPES)
self.has_style = False
self.axis_index = axis_index
self.axis_type = axis_type
self.positions = None
def set_index(self, axis_index):
self.axis_index = axis_index
def set_positions(self, positions):
self.positions = positions
def set_style(self, colour, font_size=None, alignment=None):
_check_colour(colour)
self.colour = colour
self.font_size = font_size
self.alignment = alignment
self.has_style = True
def style_to_url(self):
bits = []
bits.append(str(self.axis_index))
bits.append(self.colour)
if self.font_size is not None:
bits.append(str(self.font_size))
if self.alignment is not None:
bits.append(str(self.alignment))
return ','.join(bits)
def positions_to_url(self):
bits = []
bits.append(str(self.axis_index))
bits += [str(a) for a in self.positions]
return ','.join(bits)
class LabelAxis(Axis):
def __init__(self, axis_index, axis_type, values, **kwargs):
Axis.__init__(self, axis_index, axis_type, **kwargs)
self.values = [str(a) for a in values]
def __repr__(self):
return '%i:|%s' % (self.axis_index, '|'.join(self.values))
class RangeAxis(Axis):
def __init__(self, axis_index, axis_type, low, high, **kwargs):
Axis.__init__(self, axis_index, axis_type, **kwargs)
self.low = low
self.high = high
def __repr__(self):
return '%i,%s,%s' % (self.axis_index, self.low, self.high)
# Chart Classes
# -----------------------------------------------------------------------------
class Chart(object):
"""Abstract class for all chart types.
width are height specify the dimensions of the image. title sets the title
of the chart. legend requires a list that corresponds to datasets.
"""
BASE_URL = 'http://chart.apis.google.com/chart?'
BACKGROUND = 'bg'
CHART = 'c'
ALPHA = 'a'
VALID_SOLID_FILL_TYPES = (BACKGROUND, CHART, ALPHA)
SOLID = 's'
LINEAR_GRADIENT = 'lg'
LINEAR_STRIPES = 'ls'
def __init__(self, width, height, title=None, legend=None, colours=None,
auto_scale=True, x_range=None, y_range=None,
colours_within_series=None):
if type(self) == Chart:
raise AbstractClassException('This is an abstract class')
assert(isinstance(width, int))
assert(isinstance(height, int))
self.width = width
self.height = height
self.data = []
self.set_title(title)
self.set_legend(legend)
self.set_legend_position(None)
self.set_colours(colours)
self.set_colours_within_series(colours_within_series)
# Data for scaling.
self.auto_scale = auto_scale # Whether to automatically scale data
self.x_range = x_range # (min, max) x-axis range for scaling
self.y_range = y_range # (min, max) y-axis range for scaling
self.scaled_data_class = None
self.scaled_x_range = None
self.scaled_y_range = None
self.fill_types = {
Chart.BACKGROUND: None,
Chart.CHART: None,
Chart.ALPHA: None,
}
self.fill_area = {
Chart.BACKGROUND: None,
Chart.CHART: None,
Chart.ALPHA: None,
}
self.axis = []
self.markers = []
self.line_styles = {}
self.grid = None
# URL generation
# -------------------------------------------------------------------------
def get_url(self, data_class=None):
url_bits = self.get_url_bits(data_class=data_class)
return self.BASE_URL + '&'.join(url_bits)
def get_url_bits(self, data_class=None):
url_bits = []
# required arguments
url_bits.append(self.type_to_url())
url_bits.append('chs=%ix%i' % (self.width, self.height))
url_bits.append(self.data_to_url(data_class=data_class))
# optional arguments
if self.title:
url_bits.append('chtt=%s' % self.title)
if self.legend:
url_bits.append('chdl=%s' % '|'.join(self.legend))
if self.legend_position:
url_bits.append('chdlp=%s' % (self.legend_position))
if self.colours:
url_bits.append('chco=%s' % ','.join(self.colours))
if self.colours_within_series:
url_bits.append('chco=%s' % '|'.join(self.colours_within_series))
ret = self.fill_to_url()
if ret:
url_bits.append(ret)
ret = self.axis_to_url()
if ret:
url_bits.append(ret)
if self.markers:
url_bits.append(self.markers_to_url())
if self.line_styles:
style = []
for index in xrange(max(self.line_styles) + 1):
if index in self.line_styles:
values = self.line_styles[index]
else:
values = ('1', )
style.append(','.join(values))
url_bits.append('chls=%s' % '|'.join(style))
if self.grid:
url_bits.append('chg=%s' % self.grid)
return url_bits
# Downloading
# -------------------------------------------------------------------------
def download(self, file_name):
opener = urllib2.urlopen(self.get_url())
if opener.headers['content-type'] != 'image/png':
raise BadContentTypeException('Server responded with a ' \
'content-type of %s' % opener.headers['content-type'])
open(file_name, 'wb').write(opener.read())
# Simple settings
# -------------------------------------------------------------------------
def set_title(self, title):
if title:
self.title = urllib.quote(title)
else:
self.title = None
def set_legend(self, legend):
"""legend needs to be a list, tuple or None"""
assert(isinstance(legend, list) or isinstance(legend, tuple) or
legend is None)
if legend:
self.legend = [urllib.quote(a) for a in legend]
else:
self.legend = None
def set_legend_position(self, legend_position):
if legend_position:
self.legend_position = urllib.quote(legend_position)
else:
self.legend_position = None
# Chart colours
# -------------------------------------------------------------------------
def set_colours(self, colours):
# colours needs to be a list, tuple or None
assert(isinstance(colours, list) or isinstance(colours, tuple) or
colours is None)
# make sure the colours are in the right format
if colours:
for col in colours:
_check_colour(col)
self.colours = colours
def set_colours_within_series(self, colours):
# colours needs to be a list, tuple or None
assert(isinstance(colours, list) or isinstance(colours, tuple) or
colours is None)
# make sure the colours are in the right format
if colours:
for col in colours:
_check_colour(col)
self.colours_within_series = colours
# Background/Chart colours
# -------------------------------------------------------------------------
def fill_solid(self, area, colour):
assert(area in Chart.VALID_SOLID_FILL_TYPES)
_check_colour(colour)
self.fill_area[area] = colour
self.fill_types[area] = Chart.SOLID
def _check_fill_linear(self, angle, *args):
assert(isinstance(args, list) or isinstance(args, tuple))
assert(angle >= 0 and angle <= 90)
assert(len(args) % 2 == 0)
args = list(args) # args is probably a tuple and we need to mutate
for a in xrange(len(args) / 2):
col = args[a * 2]
offset = args[a * 2 + 1]
_check_colour(col)
assert(offset >= 0 and offset <= 1)
args[a * 2 + 1] = str(args[a * 2 + 1])
return args
def fill_linear_gradient(self, area, angle, *args):
assert(area in Chart.VALID_SOLID_FILL_TYPES)
args = self._check_fill_linear(angle, *args)
self.fill_types[area] = Chart.LINEAR_GRADIENT
self.fill_area[area] = ','.join([str(angle)] + args)
def fill_linear_stripes(self, area, angle, *args):
assert(area in Chart.VALID_SOLID_FILL_TYPES)
args = self._check_fill_linear(angle, *args)
self.fill_types[area] = Chart.LINEAR_STRIPES
self.fill_area[area] = ','.join([str(angle)] + args)
def fill_to_url(self):
areas = []
for area in (Chart.BACKGROUND, Chart.CHART, Chart.ALPHA):
if self.fill_types[area]:
areas.append('%s,%s,%s' % (area, self.fill_types[area], \
self.fill_area[area]))
if areas:
return 'chf=' + '|'.join(areas)
# Data
# -------------------------------------------------------------------------
def data_class_detection(self, data):
"""Determines the appropriate data encoding type to give satisfactory
resolution (http://code.google.com/apis/chart/#chart_data).
"""
assert(isinstance(data, list) or isinstance(data, tuple))
if not isinstance(self, (LineChart, BarChart, ScatterChart)):
# From the link above:
# Simple encoding is suitable for all other types of chart
# regardless of size.
return SimpleData
elif self.height < 100:
# The link above indicates that line and bar charts less
# than 300px in size can be suitably represented with the
# simple encoding. I've found that this isn't sufficient,
# e.g. examples/line-xy-circle.png. Let's try 100px.
return SimpleData
else:
return ExtendedData
def _filter_none(self, data):
return [r for r in data if r is not None]
def data_x_range(self):
"""Return a 2-tuple giving the minimum and maximum x-axis
data range.
"""
try:
lower = min([min(self._filter_none(s))
for type, s in self.annotated_data()
if type == 'x'])
upper = max([max(self._filter_none(s))
for type, s in self.annotated_data()
if type == 'x'])
return (lower, upper)
except ValueError:
return None # no x-axis datasets
def data_y_range(self):
"""Return a 2-tuple giving the minimum and maximum y-axis
data range.
"""
try:
lower = min([min(self._filter_none(s))
for type, s in self.annotated_data()
if type == 'y'])
upper = max([max(self._filter_none(s)) + 1
for type, s in self.annotated_data()
if type == 'y'])
return (lower, upper)
except ValueError:
return None # no y-axis datasets
def scaled_data(self, data_class, x_range=None, y_range=None):
"""Scale `self.data` as appropriate for the given data encoding
(data_class) and return it.
An optional `y_range` -- a 2-tuple (lower, upper) -- can be
given to specify the y-axis bounds. If not given, the range is
inferred from the data: (0, ) presuming no negative
values, or (, ) if there are negative
values. `self.scaled_y_range` is set to the actual lower and
upper scaling range.
Ditto for `x_range`. Note that some chart types don't have x-axis
data.
"""
self.scaled_data_class = data_class
# Determine the x-axis range for scaling.
if x_range is None:
x_range = self.data_x_range()
if x_range and x_range[0] > 0:
x_range = (x_range[0], x_range[1])
self.scaled_x_range = x_range
# Determine the y-axis range for scaling.
if y_range is None:
y_range = self.data_y_range()
if y_range and y_range[0] > 0:
y_range = (y_range[0], y_range[1])
self.scaled_y_range = y_range
scaled_data = []
for type, dataset in self.annotated_data():
if type == 'x':
scale_range = x_range
elif type == 'y':
scale_range = y_range
elif type == 'marker-size':
scale_range = (0, max(dataset))
scaled_dataset = []
for v in dataset:
if v is None:
scaled_dataset.append(None)
else:
scaled_dataset.append(
data_class.scale_value(v, scale_range))
scaled_data.append(scaled_dataset)
return scaled_data
def add_data(self, data):
self.data.append(data)
return len(self.data) - 1 # return the "index" of the data set
def data_to_url(self, data_class=None):
if not data_class:
data_class = self.data_class_detection(self.data)
if not issubclass(data_class, Data):
raise UnknownDataTypeException()
if self.auto_scale:
data = self.scaled_data(data_class, self.x_range, self.y_range)
else:
data = self.data
return repr(data_class(data))
def annotated_data(self):
for dataset in self.data:
yield ('x', dataset)
# Axis Labels
# -------------------------------------------------------------------------
def set_axis_labels(self, axis_type, values):
assert(axis_type in Axis.TYPES)
values = [urllib.quote(str(a)) for a in values]
axis_index = len(self.axis)
axis = LabelAxis(axis_index, axis_type, values)
self.axis.append(axis)
return axis_index
def set_axis_range(self, axis_type, low, high):
assert(axis_type in Axis.TYPES)
axis_index = len(self.axis)
axis = RangeAxis(axis_index, axis_type, low, high)
self.axis.append(axis)
return axis_index
def set_axis_positions(self, axis_index, positions):
try:
self.axis[axis_index].set_positions(positions)
except IndexError:
raise InvalidParametersException('Axis index %i has not been ' \
'created' % axis)
def set_axis_style(self, axis_index, colour, font_size=None, \
alignment=None):
try:
self.axis[axis_index].set_style(colour, font_size, alignment)
except IndexError:
raise InvalidParametersException('Axis index %i has not been ' \
'created' % axis)
def axis_to_url(self):
available_axis = []
label_axis = []
range_axis = []
positions = []
styles = []
index = -1
for axis in self.axis:
available_axis.append(axis.axis_type)
if isinstance(axis, RangeAxis):
range_axis.append(repr(axis))
if isinstance(axis, LabelAxis):
label_axis.append(repr(axis))
if axis.positions:
positions.append(axis.positions_to_url())
if axis.has_style:
styles.append(axis.style_to_url())
if not available_axis:
return
url_bits = []
url_bits.append('chxt=%s' % ','.join(available_axis))
if label_axis:
url_bits.append('chxl=%s' % '|'.join(label_axis))
if range_axis:
url_bits.append('chxr=%s' % '|'.join(range_axis))
if positions:
url_bits.append('chxp=%s' % '|'.join(positions))
if styles:
url_bits.append('chxs=%s' % '|'.join(styles))
return '&'.join(url_bits)
# Markers, Ranges and Fill area (chm)
# -------------------------------------------------------------------------
def markers_to_url(self):
return 'chm=%s' % '|'.join([','.join(a) for a in self.markers])
def add_marker(self, index, point, marker_type, colour, size, priority=0):
self.markers.append((marker_type, colour, str(index), str(point), \
str(size), str(priority)))
def add_horizontal_range(self, colour, start, stop):
self.markers.append(('r', colour, '0', str(start), str(stop)))
def add_data_line(self, colour, data_set, size, priority=0):
self.markers.append(('D', colour, str(data_set), '0', str(size), str(priority)))
def add_marker_text(self, string, colour, data_set, data_point, size, priority=0):
self.markers.append((str(string), colour, str(data_set), str(data_point), str(size), str(priority)))
def add_vertical_range(self, colour, start, stop):
self.markers.append(('R', colour, '0', str(start), str(stop)))
def add_fill_range(self, colour, index_start, index_end):
self.markers.append(('b', colour, str(index_start), str(index_end), \
'1'))
def add_fill_simple(self, colour):
self.markers.append(('B', colour, '1', '1', '1'))
# Line styles
# -------------------------------------------------------------------------
def set_line_style(self, index, thickness=1, line_segment=None, \
blank_segment=None):
value = []
value.append(str(thickness))
if line_segment:
value.append(str(line_segment))
value.append(str(blank_segment))
self.line_styles[index] = value
# Grid
# -------------------------------------------------------------------------
def set_grid(self, x_step, y_step, line_segment=1, \
blank_segment=0):
self.grid = '%s,%s,%s,%s' % (x_step, y_step, line_segment, \
blank_segment)
class ScatterChart(Chart):
def type_to_url(self):
return 'cht=s'
def annotated_data(self):
yield ('x', self.data[0])
yield ('y', self.data[1])
if len(self.data) > 2:
# The optional third dataset is relative sizing for point
# markers.
yield ('marker-size', self.data[2])
class LineChart(Chart):
def __init__(self, *args, **kwargs):
if type(self) == LineChart:
raise AbstractClassException('This is an abstract class')
Chart.__init__(self, *args, **kwargs)
class SimpleLineChart(LineChart):
def type_to_url(self):
return 'cht=lc'
def annotated_data(self):
# All datasets are y-axis data.
for dataset in self.data:
yield ('y', dataset)
class SparkLineChart(SimpleLineChart):
def type_to_url(self):
return 'cht=ls'
class XYLineChart(LineChart):
def type_to_url(self):
return 'cht=lxy'
def annotated_data(self):
# Datasets alternate between x-axis, y-axis.
for i, dataset in enumerate(self.data):
if i % 2 == 0:
yield ('x', dataset)
else:
yield ('y', dataset)
class BarChart(Chart):
def __init__(self, *args, **kwargs):
if type(self) == BarChart:
raise AbstractClassException('This is an abstract class')
Chart.__init__(self, *args, **kwargs)
self.bar_width = None
self.zero_lines = {}
def set_bar_width(self, bar_width):
self.bar_width = bar_width
def set_zero_line(self, index, zero_line):
self.zero_lines[index] = zero_line
def get_url_bits(self, data_class=None, skip_chbh=False):
url_bits = Chart.get_url_bits(self, data_class=data_class)
if not skip_chbh and self.bar_width is not None:
url_bits.append('chbh=%i' % self.bar_width)
zero_line = []
if self.zero_lines:
for index in xrange(max(self.zero_lines) + 1):
if index in self.zero_lines:
zero_line.append(str(self.zero_lines[index]))
else:
zero_line.append('0')
url_bits.append('chp=%s' % ','.join(zero_line))
return url_bits
class StackedHorizontalBarChart(BarChart):
def type_to_url(self):
return 'cht=bhs'
class StackedVerticalBarChart(BarChart):
def type_to_url(self):
return 'cht=bvs'
def annotated_data(self):
for dataset in self.data:
yield ('y', dataset)
class GroupedBarChart(BarChart):
def __init__(self, *args, **kwargs):
if type(self) == GroupedBarChart:
raise AbstractClassException('This is an abstract class')
BarChart.__init__(self, *args, **kwargs)
self.bar_spacing = None
self.group_spacing = None
def set_bar_spacing(self, spacing):
"""Set spacing between bars in a group."""
self.bar_spacing = spacing
def set_group_spacing(self, spacing):
"""Set spacing between groups of bars."""
self.group_spacing = spacing
def get_url_bits(self, data_class=None):
# Skip 'BarChart.get_url_bits' and call Chart directly so the parent
# doesn't add "chbh" before we do.
url_bits = BarChart.get_url_bits(self, data_class=data_class,
skip_chbh=True)
if self.group_spacing is not None:
if self.bar_spacing is None:
raise InvalidParametersException('Bar spacing is required ' \
'to be set when setting group spacing')
if self.bar_width is None:
raise InvalidParametersException('Bar width is required to ' \
'be set when setting bar spacing')
url_bits.append('chbh=%i,%i,%i'
% (self.bar_width, self.bar_spacing, self.group_spacing))
elif self.bar_spacing is not None:
if self.bar_width is None:
raise InvalidParametersException('Bar width is required to ' \
'be set when setting bar spacing')
url_bits.append('chbh=%i,%i' % (self.bar_width, self.bar_spacing))
elif self.bar_width:
url_bits.append('chbh=%i' % self.bar_width)
return url_bits
class GroupedHorizontalBarChart(GroupedBarChart):
def type_to_url(self):
return 'cht=bhg'
class GroupedVerticalBarChart(GroupedBarChart):
def type_to_url(self):
return 'cht=bvg'
def annotated_data(self):
for dataset in self.data:
yield ('y', dataset)
class PieChart(Chart):
def __init__(self, *args, **kwargs):
if type(self) == PieChart:
raise AbstractClassException('This is an abstract class')
Chart.__init__(self, *args, **kwargs)
self.pie_labels = []
if self.y_range:
warnings.warn('y_range is not used with %s.' % \
(self.__class__.__name__))
def set_pie_labels(self, labels):
self.pie_labels = [urllib.quote(a) for a in labels]
def get_url_bits(self, data_class=None):
url_bits = Chart.get_url_bits(self, data_class=data_class)
if self.pie_labels:
url_bits.append('chl=%s' % '|'.join(self.pie_labels))
return url_bits
def annotated_data(self):
# Datasets are all y-axis data. However, there should only be
# one dataset for pie charts.
for dataset in self.data:
yield ('x', dataset)
def scaled_data(self, data_class, x_range=None, y_range=None):
if not x_range:
x_range = [0, sum(self.data[0])]
return Chart.scaled_data(self, data_class, x_range, self.y_range)
class PieChart2D(PieChart):
def type_to_url(self):
return 'cht=p'
class PieChart3D(PieChart):
def type_to_url(self):
return 'cht=p3'
class VennChart(Chart):
def type_to_url(self):
return 'cht=v'
def annotated_data(self):
for dataset in self.data:
yield ('y', dataset)
class RadarChart(Chart):
def type_to_url(self):
return 'cht=r'
class SplineRadarChart(RadarChart):
def type_to_url(self):
return 'cht=rs'
class MapChart(Chart):
def __init__(self, *args, **kwargs):
Chart.__init__(self, *args, **kwargs)
self.geo_area = 'world'
self.codes = []
def type_to_url(self):
return 'cht=t'
def set_codes(self, codes):
self.codes = codes
def get_url_bits(self, data_class=None):
url_bits = Chart.get_url_bits(self, data_class=data_class)
url_bits.append('chtm=%s' % self.geo_area)
if self.codes:
url_bits.append('chld=%s' % ''.join(self.codes))
return url_bits
class GoogleOMeterChart(PieChart):
"""Inheriting from PieChart because of similar labeling"""
def __init__(self, *args, **kwargs):
PieChart.__init__(self, *args, **kwargs)
if self.auto_scale and not self.x_range:
warnings.warn('Please specify an x_range with GoogleOMeterChart, '
'otherwise one arrow will always be at the max.')
def type_to_url(self):
return 'cht=gom'
class QRChart(Chart):
def __init__(self, *args, **kwargs):
Chart.__init__(self, *args, **kwargs)
self.encoding = None
self.ec_level = None
self.margin = None
def type_to_url(self):
return 'cht=qr'
def data_to_url(self, data_class=None):
if not self.data:
raise NoDataGivenException()
return 'chl=%s' % urllib.quote(self.data[0])
def get_url_bits(self, data_class=None):
url_bits = Chart.get_url_bits(self, data_class=data_class)
if self.encoding:
url_bits.append('choe=%s' % self.encoding)
if self.ec_level:
url_bits.append('chld=%s|%s' % (self.ec_level, self.margin))
return url_bits
def set_encoding(self, encoding):
self.encoding = encoding
def set_ec(self, level, margin):
self.ec_level = level
self.margin = margin
class ChartGrammar(object):
def __init__(self):
self.grammar = None
self.chart = None
def parse(self, grammar):
self.grammar = grammar
self.chart = self.create_chart_instance()
for attr in self.grammar:
if attr in ('w', 'h', 'type', 'auto_scale', 'x_range', 'y_range'):
continue # These are already parsed in create_chart_instance
attr_func = 'parse_' + attr
if not hasattr(self, attr_func):
warnings.warn('No parser for grammar attribute "%s"' % (attr))
continue
getattr(self, attr_func)(grammar[attr])
return self.chart
def parse_data(self, data):
self.chart.data = data
@staticmethod
def get_possible_chart_types():
possible_charts = []
for cls_name in globals().keys():
if not cls_name.endswith('Chart'):
continue
cls = globals()[cls_name]
# Check if it is an abstract class
try:
a = cls(1, 1, auto_scale=False)
del a
except AbstractClassException:
continue
# Strip off "Class"
possible_charts.append(cls_name[:-5])
return possible_charts
def create_chart_instance(self, grammar=None):
if not grammar:
grammar = self.grammar
assert(isinstance(grammar, dict)) # grammar must be a dict
assert('w' in grammar) # width is required
assert('h' in grammar) # height is required
assert('type' in grammar) # type is required
chart_type = grammar['type']
w = grammar['w']
h = grammar['h']
auto_scale = grammar.get('auto_scale', None)
x_range = grammar.get('x_range', None)
y_range = grammar.get('y_range', None)
types = ChartGrammar.get_possible_chart_types()
if chart_type not in types:
raise UnknownChartType('%s is an unknown chart type. Possible '
'chart types are %s' % (chart_type, ','.join(types)))
return globals()[chart_type + 'Chart'](w, h, auto_scale=auto_scale,
x_range=x_range, y_range=y_range)
def download(self):
pass