To get this branch, use:
bzr branch
http://gegoxaren.bato24.eu/bzr/%2Bjunk/pygooglechart-py3k
« back to all changes in this revision
Viewing changes to pygooglechart.py
- browse files at revision 35
- compare with another revision
- download diff
- download tarball
- view history from revision 35
- Committer: gak
- Date: 2008-05-03 04:23:51 UTC
- Revision ID: git-v1:1f4e14367f685fad4e70b381063c5ca195704615
- Initial "grammar" code
- New exception types: AbstractClassException and UnknownChartType
- More unit tests
- Removed tests from within pygooglechart.py
- New exception types: AbstractClassException and UnknownChartType
- More unit tests
- Removed tests from within pygooglechart.py
added
removed
pygooglechart.py
1
"""
2
PyGoogleChart - A complete Python wrapper for the Google Chart API
3
4
http://pygooglechart.slowchop.com/
5
6
Copyright 2007 Gerald Kaszuba
7
8
This program is free software: you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10
the Free Software Foundation, either version 3 of the License, or
11
(at your option) any later version.
12
13
This program is distributed in the hope that it will be useful,
14
but WITHOUT ANY WARRANTY; without even the implied warranty of
15
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16
GNU General Public License for more details.
17
18
You should have received a copy of the GNU General Public License
19
along with this program. If not, see <http://www.gnu.org/licenses/>.
20
21
"""
22
23
import os
24
import urllib
25
import urllib2
26
import math
27
import random
28
import re
29
30
# Helper variables and functions
31
# -----------------------------------------------------------------------------
32
33
reo_colour = re.compile('^([A-Fa-f0-9]{2,2}){3,4}$')
34
35
36
def _check_colour(colour):
37
if not reo_colour.match(colour):
38
raise InvalidParametersException('Colours need to be in ' \
39
'RRGGBB or RRGGBBAA format. One of your colours has %s' % \
40
colour)
41
42
# Exception Classes
43
# -----------------------------------------------------------------------------
44
45
46
class PyGoogleChartException(Exception):
47
pass
48
49
50
class DataOutOfRangeException(PyGoogleChartException):
51
pass
52
53
54
class UnknownDataTypeException(PyGoogleChartException):
55
pass
56
57
58
class NoDataGivenException(PyGoogleChartException):
59
pass
60
61
62
class InvalidParametersException(PyGoogleChartException):
63
pass
64
65
66
class BadContentTypeException(PyGoogleChartException):
67
pass
68
69
70
# Data Classes
71
# -----------------------------------------------------------------------------
72
73
74
class Data(object):
75
76
def __init__(self, data):
77
assert(type(self) != Data) # This is an abstract class
78
self.data = data
79
80
81
class SimpleData(Data):
82
enc_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
83
84
def __repr__(self):
85
encoded_data = []
86
for data in self.data:
87
sub_data = []
88
for value in data:
89
if value is None:
90
sub_data.append('_')
91
elif value >= 0 and value <= SimpleData.max_value:
92
sub_data.append(SimpleData.enc_map[value])
93
else:
94
raise DataOutOfRangeException()
95
encoded_data.append(''.join(sub_data))
96
return 'chd=s:' + ','.join(encoded_data)
97
98
@staticmethod
99
def max_value():
100
return 61
101
102
103
class TextData(Data):
104
105
def __repr__(self):
106
encoded_data = []
107
for data in self.data:
108
sub_data = []
109
for value in data:
110
if value is None:
111
sub_data.append(-1)
112
elif value >= 0 and value <= TextData.max_value:
113
sub_data.append(str(float(value)))
114
else:
115
raise DataOutOfRangeException()
116
encoded_data.append(','.join(sub_data))
117
return 'chd=t:' + '|'.join(encoded_data)
118
119
@staticmethod
120
def max_value():
121
return 100
122
123
124
class ExtendedData(Data):
125
enc_map = \
126
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.'
127
128
def __repr__(self):
129
encoded_data = []
130
enc_size = len(ExtendedData.enc_map)
131
for data in self.data:
132
sub_data = []
133
for value in data:
134
if value is None:
135
sub_data.append('__')
136
elif value >= 0 and value <= ExtendedData.max_value:
137
first, second = divmod(int(value), enc_size)
138
sub_data.append('%s%s' % (
139
ExtendedData.enc_map[first],
140
ExtendedData.enc_map[second]))
141
else:
142
raise DataOutOfRangeException( \
143
'Item #%i "%s" is out of range' % (data.index(value), \
144
value))
145
encoded_data.append(''.join(sub_data))
146
return 'chd=e:' + ','.join(encoded_data)
147
148
@staticmethod
149
def max_value():
150
return 4095
151
152
# Axis Classes
153
# -----------------------------------------------------------------------------
154
155
156
class Axis(object):
157
BOTTOM = 'x'
158
TOP = 't'
159
LEFT = 'y'
160
RIGHT = 'r'
161
TYPES = (BOTTOM, TOP, LEFT, RIGHT)
162
163
def __init__(self, axis, **kw):
164
assert(axis in Axis.TYPES)
165
self.has_style = False
166
self.index = None
167
self.positions = None
168
169
def set_index(self, index):
170
self.index = index
171
172
def set_positions(self, positions):
173
self.positions = positions
174
175
def set_style(self, colour, font_size=None, alignment=None):
176
_check_colour(colour)
177
self.colour = colour
178
self.font_size = font_size
179
self.alignment = alignment
180
self.has_style = True
181
182
def style_to_url(self):
183
bits = []
184
bits.append(str(self.index))
185
bits.append(self.colour)
186
if self.font_size is not None:
187
bits.append(str(self.font_size))
188
if self.alignment is not None:
189
bits.append(str(self.alignment))
190
return ','.join(bits)
191
192
def positions_to_url(self):
193
bits = []
194
bits.append(str(self.index))
195
bits += [str(a) for a in self.positions]
196
return ','.join(bits)
197
198
199
class LabelAxis(Axis):
200
201
def __init__(self, axis, values, **kwargs):
202
Axis.__init__(self, axis, **kwargs)
203
self.values = [str(a) for a in values]
204
205
def __repr__(self):
206
return '%i:|%s' % (self.index, '|'.join(self.values))
207
208
209
class RangeAxis(Axis):
210
211
def __init__(self, axis, low, high, **kwargs):
212
Axis.__init__(self, axis, **kwargs)
213
self.low = low
214
self.high = high
215
216
def __repr__(self):
217
return '%i,%s,%s' % (self.index, self.low, self.high)
218
219
# Chart Classes
220
# -----------------------------------------------------------------------------
221
222
223
class Chart(object):
224
"""Abstract class for all chart types.
225
226
width are height specify the dimensions of the image. title sets the title
227
of the chart. legend requires a list that corresponds to datasets.
228
"""
229
230
BASE_URL = 'http://chart.apis.google.com/chart?'
231
BACKGROUND = 'bg'
232
CHART = 'c'
233
SOLID = 's'
234
LINEAR_GRADIENT = 'lg'
235
LINEAR_STRIPES = 'ls'
236
237
def __init__(self, width, height, title=None, legend=None, colours=None):
238
assert(type(self) != Chart) # This is an abstract class
239
assert(isinstance(width, int))
240
assert(isinstance(height, int))
241
self.width = width
242
self.height = height
243
self.data = []
244
self.set_title(title)
245
self.set_legend(legend)
246
self.set_colours(colours)
247
self.fill_types = {
248
Chart.BACKGROUND: None,
249
Chart.CHART: None,
250
}
251
self.fill_area = {
252
Chart.BACKGROUND: None,
253
Chart.CHART: None,
254
}
255
self.axis = {
256
Axis.TOP: None,
257
Axis.BOTTOM: None,
258
Axis.LEFT: None,
259
Axis.RIGHT: None,
260
}
261
self.markers = []
262
263
# URL generation
264
# -------------------------------------------------------------------------
265
266
def get_url(self):
267
url_bits = self.get_url_bits()
268
return self.BASE_URL + '&'.join(url_bits)
269
270
def get_url_bits(self):
271
url_bits = []
272
# required arguments
273
url_bits.append(self.type_to_url())
274
url_bits.append('chs=%ix%i' % (self.width, self.height))
275
url_bits.append(self.data_to_url())
276
# optional arguments
277
if self.title:
278
url_bits.append('chtt=%s' % self.title)
279
if self.legend:
280
url_bits.append('chdl=%s' % '|'.join(self.legend))
281
if self.colours:
282
url_bits.append('chco=%s' % ','.join(self.colours))
283
ret = self.fill_to_url()
284
if ret:
285
url_bits.append(ret)
286
ret = self.axis_to_url()
287
if ret:
288
url_bits.append(ret)
289
if self.markers:
290
url_bits.append(self.markers_to_url())
291
return url_bits
292
293
# Downloading
294
# -------------------------------------------------------------------------
295
296
def download(self, file_name):
297
opener = urllib2.urlopen(self.get_url())
298
299
if opener.headers['content-type'] != 'image/png':
300
raise BadContentTypeException('Server responded with a ' \
301
'content-type of %s' % opener.headers['content-type'])
302
303
open(file_name, 'wb').write(urllib.urlopen(self.get_url()).read())
304
305
# Simple settings
306
# -------------------------------------------------------------------------
307
308
def set_title(self, title):
309
if title:
310
self.title = urllib.quote(title)
311
else:
312
self.title = None
313
314
def set_legend(self, legend):
315
# legend needs to be a list, tuple or None
316
assert(isinstance(legend, list) or isinstance(legend, tuple) or
317
legend is None)
318
if legend:
319
self.legend = [urllib.quote(a) for a in legend]
320
else:
321
self.legend = None
322
323
# Chart colours
324
# -------------------------------------------------------------------------
325
326
def set_colours(self, colours):
327
# colours needs to be a list, tuple or None
328
assert(isinstance(colours, list) or isinstance(colours, tuple) or
329
colours is None)
330
# make sure the colours are in the right format
331
if colours:
332
for col in colours:
333
_check_colour(col)
334
self.colours = colours
335
336
# Background/Chart colours
337
# -------------------------------------------------------------------------
338
339
def fill_solid(self, area, colour):
340
assert(area in (Chart.BACKGROUND, Chart.CHART))
341
_check_colour(colour)
342
self.fill_area[area] = colour
343
self.fill_types[area] = Chart.SOLID
344
345
def _check_fill_linear(self, angle, *args):
346
assert(isinstance(args, list) or isinstance(args, tuple))
347
assert(angle >= 0 and angle <= 90)
348
assert(len(args) % 2 == 0)
349
args = list(args) # args is probably a tuple and we need to mutate
350
for a in xrange(len(args) / 2):
351
col = args[a * 2]
352
offset = args[a * 2 + 1]
353
_check_colour(col)
354
assert(offset >= 0 and offset <= 1)
355
args[a * 2 + 1] = str(args[a * 2 + 1])
356
return args
357
358
def fill_linear_gradient(self, area, angle, *args):
359
assert(area in (Chart.BACKGROUND, Chart.CHART))
360
args = self._check_fill_linear(angle, *args)
361
self.fill_types[area] = Chart.LINEAR_GRADIENT
362
self.fill_area[area] = ','.join([str(angle)] + args)
363
364
def fill_linear_stripes(self, area, angle, *args):
365
assert(area in (Chart.BACKGROUND, Chart.CHART))
366
args = self._check_fill_linear(angle, *args)
367
self.fill_types[area] = Chart.LINEAR_STRIPES
368
self.fill_area[area] = ','.join([str(angle)] + args)
369
370
def fill_to_url(self):
371
areas = []
372
for area in (Chart.BACKGROUND, Chart.CHART):
373
if self.fill_types[area]:
374
areas.append('%s,%s,%s' % (area, self.fill_types[area], \
375
self.fill_area[area]))
376
if areas:
377
return 'chf=' + '|'.join(areas)
378
379
# Data
380
# -------------------------------------------------------------------------
381
382
def data_class_detection(self, data):
383
"""
384
Detects and returns the data type required based on the range of the
385
data given. The data given must be lists of numbers within a list.
386
"""
387
assert(isinstance(data, list) or isinstance(data, tuple))
388
max_value = None
389
for a in data:
390
assert(isinstance(a, list) or isinstance(a, tuple))
391
if max_value is None or max(a) > max_value:
392
max_value = max(a)
393
for data_class in (SimpleData, TextData, ExtendedData):
394
if max_value <= data_class.max_value():
395
return data_class
396
raise DataOutOfRangeException()
397
398
def add_data(self, data):
399
self.data.append(data)
400
return len(self.data) - 1 # return the "index" of the data set
401
402
def data_to_url(self, data_class=None):
403
if not data_class:
404
data_class = self.data_class_detection(self.data)
405
if not issubclass(data_class, Data):
406
raise UnknownDataTypeException()
407
return repr(data_class(self.data))
408
409
# Axis Labels
410
# -------------------------------------------------------------------------
411
412
def set_axis_labels(self, axis, values):
413
assert(axis in Axis.TYPES)
414
self.axis[axis] = LabelAxis(axis, values)
415
416
def set_axis_range(self, axis, low, high):
417
assert(axis in Axis.TYPES)
418
self.axis[axis] = RangeAxis(axis, low, high)
419
420
def set_axis_positions(self, axis, positions):
421
assert(axis in Axis.TYPES)
422
if not self.axis[axis]:
423
raise InvalidParametersException('Please create an axis first')
424
self.axis[axis].set_positions(positions)
425
426
def set_axis_style(self, axis, colour, font_size=None, alignment=None):
427
assert(axis in Axis.TYPES)
428
if not self.axis[axis]:
429
raise InvalidParametersException('Please create an axis first')
430
self.axis[axis].set_style(colour, font_size, alignment)
431
432
def axis_to_url(self):
433
available_axis = []
434
label_axis = []
435
range_axis = []
436
positions = []
437
styles = []
438
index = -1
439
for position, axis in self.axis.items():
440
if not axis:
441
continue
442
index += 1
443
axis.set_index(index)
444
available_axis.append(position)
445
if isinstance(axis, RangeAxis):
446
range_axis.append(repr(axis))
447
if isinstance(axis, LabelAxis):
448
label_axis.append(repr(axis))
449
if axis.positions:
450
positions.append(axis.positions_to_url())
451
if axis.has_style:
452
styles.append(axis.style_to_url())
453
if not available_axis:
454
return
455
url_bits = []
456
url_bits.append('chxt=%s' % ','.join(available_axis))
457
if label_axis:
458
url_bits.append('chxl=%s' % '|'.join(label_axis))
459
if range_axis:
460
url_bits.append('chxr=%s' % '|'.join(range_axis))
461
if positions:
462
url_bits.append('chxp=%s' % '|'.join(positions))
463
if styles:
464
url_bits.append('chxs=%s' % '|'.join(styles))
465
return '&'.join(url_bits)
466
467
# Markers, Ranges and Fill area (chm)
468
# -------------------------------------------------------------------------
469
470
def markers_to_url(self):
471
return 'chm=%s' % '|'.join([','.join(a) for a in self.markers])
472
473
def add_marker(self, index, point, marker_type, colour, size):
474
self.markers.append((marker_type, colour, str(index), str(point), \
475
str(size)))
476
477
def add_horizontal_range(self, colour, start, stop):
478
self.markers.append(('r', colour, '1', str(start), str(stop)))
479
480
def add_vertical_range(self, colour, start, stop):
481
self.markers.append(('R', colour, '1', str(start), str(stop)))
482
483
def add_fill_range(self, colour, index_start, index_end):
484
self.markers.append(('b', colour, str(index_start), str(index_end), \
485
'1'))
486
487
def add_fill_simple(self, colour):
488
self.markers.append(('B', colour, '1', '1', '1'))
489
490
491
class ScatterChart(Chart):
492
493
def __init__(self, *args, **kwargs):
494
Chart.__init__(self, *args, **kwargs)
495
496
def type_to_url(self):
497
return 'cht=s'
498
499
500
class LineChart(Chart):
501
502
def __init__(self, *args, **kwargs):
503
assert(type(self) != LineChart) # This is an abstract class
504
Chart.__init__(self, *args, **kwargs)
505
self.line_styles = {}
506
self.grid = None
507
508
def set_line_style(self, index, thickness=1, line_segment=None, \
509
blank_segment=None):
510
value = []
511
value.append(str(thickness))
512
if line_segment:
513
value.append(str(line_segment))
514
value.append(str(blank_segment))
515
self.line_styles[index] = value
516
517
def set_grid(self, x_step, y_step, line_segment=1, \
518
blank_segment=0):
519
self.grid = '%s,%s,%s,%s' % (x_step, y_step, line_segment, \
520
blank_segment)
521
522
def get_url_bits(self):
523
url_bits = Chart.get_url_bits(self)
524
if self.line_styles:
525
style = []
526
# for index, values in self.line_style.items():
527
for index in xrange(max(self.line_styles) + 1):
528
if index in self.line_styles:
529
values = self.line_styles[index]
530
else:
531
values = ('1', )
532
style.append(','.join(values))
533
url_bits.append('chls=%s' % '|'.join(style))
534
if self.grid:
535
url_bits.append('chg=%s' % self.grid)
536
return url_bits
537
538
539
class SimpleLineChart(LineChart):
540
541
def type_to_url(self):
542
return 'cht=lc'
543
544
545
class XYLineChart(LineChart):
546
547
def type_to_url(self):
548
return 'cht=lxy'
549
550
551
class BarChart(Chart):
552
553
def __init__(self, *args, **kwargs):
554
assert(type(self) != BarChart) # This is an abstract class
555
Chart.__init__(self, *args, **kwargs)
556
self.bar_width = None
557
558
def set_bar_width(self, bar_width):
559
self.bar_width = bar_width
560
561
def get_url_bits(self):
562
url_bits = Chart.get_url_bits(self)
563
url_bits.append('chbh=%i' % self.bar_width)
564
return url_bits
565
566
567
class StackedHorizontalBarChart(BarChart):
568
569
def type_to_url(self):
570
return 'cht=bhs'
571
572
573
class StackedVerticalBarChart(BarChart):
574
575
def type_to_url(self):
576
return 'cht=bvs'
577
578
579
class GroupedBarChart(BarChart):
580
581
def __init__(self, *args, **kwargs):
582
assert(type(self) != GroupedBarChart) # This is an abstract class
583
BarChart.__init__(self, *args, **kwargs)
584
self.bar_spacing = None
585
586
def set_bar_spacing(self, spacing):
587
self.bar_spacing = spacing
588
589
def get_url_bits(self):
590
# Skip 'BarChart.get_url_bits' and call Chart directly so the parent
591
# doesn't add "chbh" before we do.
592
url_bits = Chart.get_url_bits(self)
593
if self.bar_spacing is not None:
594
if self.bar_width is None:
595
raise InvalidParametersException('Bar width is required to ' \
596
'be set when setting spacing')
597
url_bits.append('chbh=%i,%i' % (self.bar_width, self.bar_spacing))
598
else:
599
url_bits.append('chbh=%i' % self.bar_width)
600
return url_bits
601
602
603
class GroupedHorizontalBarChart(GroupedBarChart):
604
605
def type_to_url(self):
606
return 'cht=bhg'
607
608
609
class GroupedVerticalBarChart(GroupedBarChart):
610
611
def type_to_url(self):
612
return 'cht=bvg'
613
614
615
class PieChart(Chart):
616
617
def __init__(self, *args, **kwargs):
618
assert(type(self) != PieChart) # This is an abstract class
619
Chart.__init__(self, *args, **kwargs)
620
self.pie_labels = []
621
622
def set_pie_labels(self, labels):
623
self.pie_labels = labels
624
625
def get_url_bits(self):
626
url_bits = Chart.get_url_bits(self)
627
if self.pie_labels:
628
url_bits.append('chl=%s' % '|'.join(self.pie_labels))
629
return url_bits
630
631
632
class PieChart2D(PieChart):
633
634
def type_to_url(self):
635
return 'cht=p'
636
637
638
class PieChart3D(PieChart):
639
640
def type_to_url(self):
641
return 'cht=p3'
642
643
644
class VennChart(Chart):
645
646
def type_to_url(self):
647
return 'cht=v'
648
649
650
def test():
651
chart = GroupedVerticalBarChart(320, 200)
652
chart = PieChart2D(320, 200)
653
chart = ScatterChart(320, 200)
654
chart = SimpleLineChart(320, 200)
655
sine_data = [math.sin(float(a) / 10) * 2000 + 2000 for a in xrange(100)]
656
random_data = [a * random.random() * 30 for a in xrange(40)]
657
random_data2 = [random.random() * 4000 for a in xrange(10)]
658
# chart.set_bar_width(50)
659
# chart.set_bar_spacing(0)
660
chart.add_data(sine_data)
661
chart.add_data(random_data)
662
chart.add_data(random_data2)
663
# chart.set_line_style(1, thickness=2)
664
# chart.set_line_style(2, line_segment=10, blank_segment=5)
665
# chart.set_title('heloooo')
666
# chart.set_legend(('sine wave', 'random * x'))
667
# chart.set_colours(('ee2000', 'DDDDAA', 'fF03f2'))
668
# chart.fill_solid(Chart.BACKGROUND, '123456')
669
# chart.fill_linear_gradient(Chart.CHART, 20, '004070', 1, '300040', 0,
670
# 'aabbcc00', 0.5)
671
# chart.fill_linear_stripes(Chart.CHART, 20, '204070', .2, '300040', .2,
672
# 'aabbcc00', 0.2)
673
chart.set_axis_range(Axis.LEFT, 0, 10)
674
chart.set_axis_range(Axis.RIGHT, 5, 30)
675
chart.set_axis_labels(Axis.BOTTOM, [1, 25, 95])
676
chart.set_axis_positions(Axis.BOTTOM, [1, 25, 95])
677
chart.set_axis_style(Axis.BOTTOM, 'FFFFFF', 15)
678
679
# chart.set_pie_labels(('apples', 'oranges', 'bananas'))
680
681
# chart.set_grid(10, 10)
682
683
# for a in xrange(0, 100, 10):
684
# chart.add_marker(1, a, 'a', 'AACA20', 10)
685
686
chart.add_horizontal_range('00A020', .2, .5)
687
chart.add_vertical_range('00c030', .2, .4)
688
689
chart.add_fill_simple('303030A0')
690
691
chart.download('test.png')
692
693
url = chart.get_url()
694
print url
695
if 0:
696
data = urllib.urlopen(chart.get_url()).read()
697
open('meh.png', 'wb').write(data)
698
os.system('start meh.png')
699
700
701
if __name__ == '__main__':
702
test()
1
"""
2
pygooglechart - A complete Python wrapper for the Google Chart API
3
4
http://pygooglechart.slowchop.com/
5
6
Copyright 2007-2008 Gerald Kaszuba
7
8
This program is free software: you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10
the Free Software Foundation, either version 3 of the License, or
11
(at your option) any later version.
12
13
This program is distributed in the hope that it will be useful,
14
but WITHOUT ANY WARRANTY; without even the implied warranty of
15
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16
GNU General Public License for more details.
17
18
You should have received a copy of the GNU General Public License
19
along with this program. If not, see <http://www.gnu.org/licenses/>.
20
21
"""
22
23
import os
24
import urllib
25
import urllib2
26
import math
27
import random
28
import re
29
30
# Helper variables and functions
31
# -----------------------------------------------------------------------------
32
33
__version__ = '0.2.1'
34
__author__ = 'Gerald Kaszuba'
35
36
reo_colour = re.compile('^([A-Fa-f0-9]{2,2}){3,4}$')
37
38
def _check_colour(colour):
39
if not reo_colour.match(colour):
40
raise InvalidParametersException('Colours need to be in ' \
41
'RRGGBB or RRGGBBAA format. One of your colours has %s' % \
42
colour)
43
44
# Exception Classes
45
# -----------------------------------------------------------------------------
46
47
48
class PyGoogleChartException(Exception):
49
pass
50
51
52
class DataOutOfRangeException(PyGoogleChartException):
53
pass
54
55
56
class UnknownDataTypeException(PyGoogleChartException):
57
pass
58
59
60
class NoDataGivenException(PyGoogleChartException):
61
pass
62
63
64
class InvalidParametersException(PyGoogleChartException):
65
pass
66
67
68
class BadContentTypeException(PyGoogleChartException):
69
pass
70
71
72
class AbstractClassException(PyGoogleChartException):
73
pass
74
75
76
class UnknownChartType(PyGoogleChartException):
77
pass
78
79
80
# Data Classes
81
# -----------------------------------------------------------------------------
82
83
84
class Data(object):
85
86
def __init__(self, data):
87
if type(self) == Data:
88
raise AbstractClassException('This is an abstract class')
89
self.data = data
90
91
@classmethod
92
def float_scale_value(cls, value, range):
93
lower, upper = range
94
assert(upper > lower)
95
max_value = cls.max_value()
96
scaled = (value-lower) * (float(max_value) / (upper - lower))
97
return scaled
98
99
@classmethod
100
def clip_value(cls, value):
101
return max(0, min(value, cls.max_value()))
102
103
@classmethod
104
def int_scale_value(cls, value, range):
105
return int(round(cls.float_scale_value(value, range)))
106
107
@classmethod
108
def scale_value(cls, value, range):
109
scaled = cls.int_scale_value(value, range)
110
clipped = cls.clip_value(scaled)
111
return clipped
112
113
114
class SimpleData(Data):
115
116
enc_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
117
118
def __repr__(self):
119
max_value = self.max_value()
120
encoded_data = []
121
for data in self.data:
122
sub_data = []
123
for value in data:
124
if value is None:
125
sub_data.append('_')
126
elif value >= 0 and value <= max_value:
127
sub_data.append(SimpleData.enc_map[value])
128
else:
129
raise DataOutOfRangeException('cannot encode value: %d'
130
% value)
131
encoded_data.append(''.join(sub_data))
132
return 'chd=s:' + ','.join(encoded_data)
133
134
@staticmethod
135
def max_value():
136
return 61
137
138
139
class TextData(Data):
140
141
def __repr__(self):
142
max_value = self.max_value()
143
encoded_data = []
144
for data in self.data:
145
sub_data = []
146
for value in data:
147
if value is None:
148
sub_data.append(-1)
149
elif value >= 0 and value <= max_value:
150
sub_data.append("%.1f" % float(value))
151
else:
152
raise DataOutOfRangeException()
153
encoded_data.append(','.join(sub_data))
154
return 'chd=t:' + '|'.join(encoded_data)
155
156
@staticmethod
157
def max_value():
158
return 100
159
160
@classmethod
161
def scale_value(cls, value, range):
162
# use float values instead of integers because we don't need an encode
163
# map index
164
scaled = cls.float_scale_value(value, range)
165
clipped = cls.clip_value(scaled)
166
return clipped
167
168
169
class ExtendedData(Data):
170
171
enc_map = \
172
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.'
173
174
def __repr__(self):
175
max_value = self.max_value()
176
encoded_data = []
177
enc_size = len(ExtendedData.enc_map)
178
for data in self.data:
179
sub_data = []
180
for value in data:
181
if value is None:
182
sub_data.append('__')
183
elif value >= 0 and value <= max_value:
184
first, second = divmod(int(value), enc_size)
185
sub_data.append('%s%s' % (
186
ExtendedData.enc_map[first],
187
ExtendedData.enc_map[second]))
188
else:
189
raise DataOutOfRangeException( \
190
'Item #%i "%s" is out of range' % (data.index(value), \
191
value))
192
encoded_data.append(''.join(sub_data))
193
return 'chd=e:' + ','.join(encoded_data)
194
195
@staticmethod
196
def max_value():
197
return 4095
198
199
200
# Axis Classes
201
# -----------------------------------------------------------------------------
202
203
204
class Axis(object):
205
206
BOTTOM = 'x'
207
TOP = 't'
208
LEFT = 'y'
209
RIGHT = 'r'
210
TYPES = (BOTTOM, TOP, LEFT, RIGHT)
211
212
def __init__(self, axis_index, axis_type, **kw):
213
assert(axis_type in Axis.TYPES)
214
self.has_style = False
215
self.axis_index = axis_index
216
self.axis_type = axis_type
217
self.positions = None
218
219
def set_index(self, axis_index):
220
self.axis_index = axis_index
221
222
def set_positions(self, positions):
223
self.positions = positions
224
225
def set_style(self, colour, font_size=None, alignment=None):
226
_check_colour(colour)
227
self.colour = colour
228
self.font_size = font_size
229
self.alignment = alignment
230
self.has_style = True
231
232
def style_to_url(self):
233
bits = []
234
bits.append(str(self.axis_index))
235
bits.append(self.colour)
236
if self.font_size is not None:
237
bits.append(str(self.font_size))
238
if self.alignment is not None:
239
bits.append(str(self.alignment))
240
return ','.join(bits)
241
242
def positions_to_url(self):
243
bits = []
244
bits.append(str(self.axis_index))
245
bits += [str(a) for a in self.positions]
246
return ','.join(bits)
247
248
249
class LabelAxis(Axis):
250
251
def __init__(self, axis_index, axis_type, values, **kwargs):
252
Axis.__init__(self, axis_index, axis_type, **kwargs)
253
self.values = [str(a) for a in values]
254
255
def __repr__(self):
256
return '%i:|%s' % (self.axis_index, '|'.join(self.values))
257
258
259
class RangeAxis(Axis):
260
261
def __init__(self, axis_index, axis_type, low, high, **kwargs):
262
Axis.__init__(self, axis_index, axis_type, **kwargs)
263
self.low = low
264
self.high = high
265
266
def __repr__(self):
267
return '%i,%s,%s' % (self.axis_index, self.low, self.high)
268
269
# Chart Classes
270
# -----------------------------------------------------------------------------
271
272
273
class Chart(object):
274
"""Abstract class for all chart types.
275
276
width are height specify the dimensions of the image. title sets the title
277
of the chart. legend requires a list that corresponds to datasets.
278
"""
279
280
BASE_URL = 'http://chart.apis.google.com/chart?'
281
BACKGROUND = 'bg'
282
CHART = 'c'
283
ALPHA = 'a'
284
VALID_SOLID_FILL_TYPES = (BACKGROUND, CHART, ALPHA)
285
SOLID = 's'
286
LINEAR_GRADIENT = 'lg'
287
LINEAR_STRIPES = 'ls'
288
289
def __init__(self, width, height, title=None, legend=None, colours=None,
290
auto_scale=True, x_range=None, y_range=None):
291
if type(self) == Chart:
292
raise AbstractClassException('This is an abstract class')
293
assert(isinstance(width, int))
294
assert(isinstance(height, int))
295
self.width = width
296
self.height = height
297
self.data = []
298
self.set_title(title)
299
self.set_legend(legend)
300
self.set_colours(colours)
301
302
# Data for scaling.
303
self.auto_scale = auto_scale # Whether to automatically scale data
304
self.x_range = x_range # (min, max) x-axis range for scaling
305
self.y_range = y_range # (min, max) y-axis range for scaling
306
self.scaled_data_class = None
307
self.scaled_x_range = None
308
self.scaled_y_range = None
309
310
self.fill_types = {
311
Chart.BACKGROUND: None,
312
Chart.CHART: None,
313
Chart.ALPHA: None,
314
}
315
self.fill_area = {
316
Chart.BACKGROUND: None,
317
Chart.CHART: None,
318
Chart.ALPHA: None,
319
}
320
self.axis = []
321
self.markers = []
322
self.line_styles = {}
323
self.grid = None
324
325
# URL generation
326
# -------------------------------------------------------------------------
327
328
def get_url(self, data_class=None):
329
url_bits = self.get_url_bits(data_class=data_class)
330
return self.BASE_URL + '&'.join(url_bits)
331
332
def get_url_bits(self, data_class=None):
333
url_bits = []
334
# required arguments
335
url_bits.append(self.type_to_url())
336
url_bits.append('chs=%ix%i' % (self.width, self.height))
337
url_bits.append(self.data_to_url(data_class=data_class))
338
# optional arguments
339
if self.title:
340
url_bits.append('chtt=%s' % self.title)
341
if self.legend:
342
url_bits.append('chdl=%s' % '|'.join(self.legend))
343
if self.colours:
344
url_bits.append('chco=%s' % ','.join(self.colours))
345
ret = self.fill_to_url()
346
if ret:
347
url_bits.append(ret)
348
ret = self.axis_to_url()
349
if ret:
350
url_bits.append(ret)
351
if self.markers:
352
url_bits.append(self.markers_to_url())
353
if self.line_styles:
354
style = []
355
for index in xrange(max(self.line_styles) + 1):
356
if index in self.line_styles:
357
values = self.line_styles[index]
358
else:
359
values = ('1', )
360
style.append(','.join(values))
361
url_bits.append('chls=%s' % '|'.join(style))
362
if self.grid:
363
url_bits.append('chg=%s' % self.grid)
364
return url_bits
365
366
# Downloading
367
# -------------------------------------------------------------------------
368
369
def download(self, file_name):
370
opener = urllib2.urlopen(self.get_url())
371
372
if opener.headers['content-type'] != 'image/png':
373
raise BadContentTypeException('Server responded with a ' \
374
'content-type of %s' % opener.headers['content-type'])
375
376
open(file_name, 'wb').write(urllib.urlopen(self.get_url()).read())
377
378
# Simple settings
379
# -------------------------------------------------------------------------
380
381
def set_title(self, title):
382
if title:
383
self.title = urllib.quote(title)
384
else:
385
self.title = None
386
387
def set_legend(self, legend):
388
"""legend needs to be a list, tuple or None"""
389
assert(isinstance(legend, list) or isinstance(legend, tuple) or
390
legend is None)
391
if legend:
392
self.legend = [urllib.quote(a) for a in legend]
393
else:
394
self.legend = None
395
396
# Chart colours
397
# -------------------------------------------------------------------------
398
399
def set_colours(self, colours):
400
# colours needs to be a list, tuple or None
401
assert(isinstance(colours, list) or isinstance(colours, tuple) or
402
colours is None)
403
# make sure the colours are in the right format
404
if colours:
405
for col in colours:
406
_check_colour(col)
407
self.colours = colours
408
409
# Background/Chart colours
410
# -------------------------------------------------------------------------
411
412
def fill_solid(self, area, colour):
413
assert(area in Chart.VALID_SOLID_FILL_TYPES)
414
_check_colour(colour)
415
self.fill_area[area] = colour
416
self.fill_types[area] = Chart.SOLID
417
418
def _check_fill_linear(self, angle, *args):
419
assert(isinstance(args, list) or isinstance(args, tuple))
420
assert(angle >= 0 and angle <= 90)
421
assert(len(args) % 2 == 0)
422
args = list(args) # args is probably a tuple and we need to mutate
423
for a in xrange(len(args) / 2):
424
col = args[a * 2]
425
offset = args[a * 2 + 1]
426
_check_colour(col)
427
assert(offset >= 0 and offset <= 1)
428
args[a * 2 + 1] = str(args[a * 2 + 1])
429
return args
430
431
def fill_linear_gradient(self, area, angle, *args):
432
assert(area in Chart.VALID_SOLID_FILL_TYPES)
433
args = self._check_fill_linear(angle, *args)
434
self.fill_types[area] = Chart.LINEAR_GRADIENT
435
self.fill_area[area] = ','.join([str(angle)] + args)
436
437
def fill_linear_stripes(self, area, angle, *args):
438
assert(area in Chart.VALID_SOLID_FILL_TYPES)
439
args = self._check_fill_linear(angle, *args)
440
self.fill_types[area] = Chart.LINEAR_STRIPES
441
self.fill_area[area] = ','.join([str(angle)] + args)
442
443
def fill_to_url(self):
444
areas = []
445
for area in (Chart.BACKGROUND, Chart.CHART, Chart.ALPHA):
446
if self.fill_types[area]:
447
areas.append('%s,%s,%s' % (area, self.fill_types[area], \
448
self.fill_area[area]))
449
if areas:
450
return 'chf=' + '|'.join(areas)
451
452
# Data
453
# -------------------------------------------------------------------------
454
455
def data_class_detection(self, data):
456
"""Determines the appropriate data encoding type to give satisfactory
457
resolution (http://code.google.com/apis/chart/#chart_data).
458
"""
459
assert(isinstance(data, list) or isinstance(data, tuple))
460
if not isinstance(self, (LineChart, BarChart, ScatterChart)):
461
# From the link above:
462
# Simple encoding is suitable for all other types of chart
463
# regardless of size.
464
return SimpleData
465
elif self.height < 100:
466
# The link above indicates that line and bar charts less
467
# than 300px in size can be suitably represented with the
468
# simple encoding. I've found that this isn't sufficient,
469
# e.g. examples/line-xy-circle.png. Let's try 100px.
470
return SimpleData
471
else:
472
return ExtendedData
473
474
def data_x_range(self):
475
"""Return a 2-tuple giving the minimum and maximum x-axis
476
data range.
477
"""
478
try:
479
lower = min([min(s) for type, s in self.annotated_data()
480
if type == 'x'])
481
upper = max([max(s) for type, s in self.annotated_data()
482
if type == 'x'])
483
return (lower, upper)
484
except ValueError:
485
return None # no x-axis datasets
486
487
def data_y_range(self):
488
"""Return a 2-tuple giving the minimum and maximum y-axis
489
data range.
490
"""
491
try:
492
lower = min([min(s) for type, s in self.annotated_data()
493
if type == 'y'])
494
upper = max([max(s) + 1 for type, s in self.annotated_data()
495
if type == 'y'])
496
return (lower, upper)
497
except ValueError:
498
return None # no y-axis datasets
499
500
def scaled_data(self, data_class, x_range=None, y_range=None):
501
"""Scale `self.data` as appropriate for the given data encoding
502
(data_class) and return it.
503
504
An optional `y_range` -- a 2-tuple (lower, upper) -- can be
505
given to specify the y-axis bounds. If not given, the range is
506
inferred from the data: (0, <max-value>) presuming no negative
507
values, or (<min-value>, <max-value>) if there are negative
508
values. `self.scaled_y_range` is set to the actual lower and
509
upper scaling range.
510
511
Ditto for `x_range`. Note that some chart types don't have x-axis
512
data.
513
"""
514
self.scaled_data_class = data_class
515
516
# Determine the x-axis range for scaling.
517
if x_range is None:
518
x_range = self.data_x_range()
519
if x_range and x_range[0] > 0:
520
x_range = (0, x_range[1])
521
self.scaled_x_range = x_range
522
523
# Determine the y-axis range for scaling.
524
if y_range is None:
525
y_range = self.data_y_range()
526
if y_range and y_range[0] > 0:
527
y_range = (0, y_range[1])
528
self.scaled_y_range = y_range
529
530
scaled_data = []
531
for type, dataset in self.annotated_data():
532
if type == 'x':
533
scale_range = x_range
534
elif type == 'y':
535
scale_range = y_range
536
elif type == 'marker-size':
537
scale_range = (0, max(dataset))
538
scaled_data.append([data_class.scale_value(v, scale_range)
539
for v in dataset])
540
return scaled_data
541
542
def add_data(self, data):
543
self.data.append(data)
544
return len(self.data) - 1 # return the "index" of the data set
545
546
def data_to_url(self, data_class=None):
547
if not data_class:
548
data_class = self.data_class_detection(self.data)
549
if not issubclass(data_class, Data):
550
raise UnknownDataTypeException()
551
if self.auto_scale:
552
print data_class
553
data = self.scaled_data(data_class, self.x_range, self.y_range)
554
else:
555
data = self.data
556
return repr(data_class(data))
557
558
def annotated_data(self):
559
for dataset in self.data:
560
yield ('x', dataset)
561
562
# Axis Labels
563
# -------------------------------------------------------------------------
564
565
def set_axis_labels(self, axis_type, values):
566
assert(axis_type in Axis.TYPES)
567
values = [urllib.quote(a) for a in values]
568
axis_index = len(self.axis)
569
axis = LabelAxis(axis_index, axis_type, values)
570
self.axis.append(axis)
571
return axis_index
572
573
def set_axis_range(self, axis_type, low, high):
574
assert(axis_type in Axis.TYPES)
575
axis_index = len(self.axis)
576
axis = RangeAxis(axis_index, axis_type, low, high)
577
self.axis.append(axis)
578
return axis_index
579
580
def set_axis_positions(self, axis_index, positions):
581
try:
582
self.axis[axis_index].set_positions(positions)
583
except IndexError:
584
raise InvalidParametersException('Axis index %i has not been ' \
585
'created' % axis)
586
587
def set_axis_style(self, axis_index, colour, font_size=None, \
588
alignment=None):
589
try:
590
self.axis[axis_index].set_style(colour, font_size, alignment)
591
except IndexError:
592
raise InvalidParametersException('Axis index %i has not been ' \
593
'created' % axis)
594
595
def axis_to_url(self):
596
available_axis = []
597
label_axis = []
598
range_axis = []
599
positions = []
600
styles = []
601
index = -1
602
for axis in self.axis:
603
available_axis.append(axis.axis_type)
604
if isinstance(axis, RangeAxis):
605
range_axis.append(repr(axis))
606
if isinstance(axis, LabelAxis):
607
label_axis.append(repr(axis))
608
if axis.positions:
609
positions.append(axis.positions_to_url())
610
if axis.has_style:
611
styles.append(axis.style_to_url())
612
if not available_axis:
613
return
614
url_bits = []
615
url_bits.append('chxt=%s' % ','.join(available_axis))
616
if label_axis:
617
url_bits.append('chxl=%s' % '|'.join(label_axis))
618
if range_axis:
619
url_bits.append('chxr=%s' % '|'.join(range_axis))
620
if positions:
621
url_bits.append('chxp=%s' % '|'.join(positions))
622
if styles:
623
url_bits.append('chxs=%s' % '|'.join(styles))
624
return '&'.join(url_bits)
625
626
# Markers, Ranges and Fill area (chm)
627
# -------------------------------------------------------------------------
628
629
def markers_to_url(self):
630
return 'chm=%s' % '|'.join([','.join(a) for a in self.markers])
631
632
def add_marker(self, index, point, marker_type, colour, size, priority=0):
633
self.markers.append((marker_type, colour, str(index), str(point), \
634
str(size), str(priority)))
635
636
def add_horizontal_range(self, colour, start, stop):
637
self.markers.append(('r', colour, '1', str(start), str(stop)))
638
639
def add_vertical_range(self, colour, start, stop):
640
self.markers.append(('R', colour, '1', str(start), str(stop)))
641
642
def add_fill_range(self, colour, index_start, index_end):
643
self.markers.append(('b', colour, str(index_start), str(index_end), \
644
'1'))
645
646
def add_fill_simple(self, colour):
647
self.markers.append(('B', colour, '1', '1', '1'))
648
649
# Line styles
650
# -------------------------------------------------------------------------
651
652
def set_line_style(self, index, thickness=1, line_segment=None, \
653
blank_segment=None):
654
value = []
655
value.append(str(thickness))
656
if line_segment:
657
value.append(str(line_segment))
658
value.append(str(blank_segment))
659
self.line_styles[index] = value
660
661
# Grid
662
# -------------------------------------------------------------------------
663
664
def set_grid(self, x_step, y_step, line_segment=1, \
665
blank_segment=0):
666
self.grid = '%s,%s,%s,%s' % (x_step, y_step, line_segment, \
667
blank_segment)
668
669
670
class ScatterChart(Chart):
671
672
def type_to_url(self):
673
return 'cht=s'
674
675
def annotated_data(self):
676
yield ('x', self.data[0])
677
yield ('y', self.data[1])
678
if len(self.data) > 2:
679
# The optional third dataset is relative sizing for point
680
# markers.
681
yield ('marker-size', self.data[2])
682
683
684
class LineChart(Chart):
685
686
def __init__(self, *args, **kwargs):
687
if type(self) == LineChart:
688
raise AbstractClassException('This is an abstract class')
689
Chart.__init__(self, *args, **kwargs)
690
691
692
class SimpleLineChart(LineChart):
693
694
def type_to_url(self):
695
return 'cht=lc'
696
697
def annotated_data(self):
698
# All datasets are y-axis data.
699
for dataset in self.data:
700
yield ('y', dataset)
701
702
703
class SparkLineChart(SimpleLineChart):
704
705
def type_to_url(self):
706
return 'cht=ls'
707
708
709
class XYLineChart(LineChart):
710
711
def type_to_url(self):
712
return 'cht=lxy'
713
714
def annotated_data(self):
715
# Datasets alternate between x-axis, y-axis.
716
for i, dataset in enumerate(self.data):
717
if i % 2 == 0:
718
yield ('x', dataset)
719
else:
720
yield ('y', dataset)
721
722
723
class BarChart(Chart):
724
725
def __init__(self, *args, **kwargs):
726
if type(self) == BarChart:
727
raise AbstractClassException('This is an abstract class')
728
Chart.__init__(self, *args, **kwargs)
729
self.bar_width = None
730
self.zero_lines = {}
731
732
def set_bar_width(self, bar_width):
733
self.bar_width = bar_width
734
735
def set_zero_line(self, index, zero_line):
736
self.zero_lines[index] = zero_line
737
738
def get_url_bits(self, data_class=None, skip_chbh=False):
739
url_bits = Chart.get_url_bits(self, data_class=data_class)
740
if not skip_chbh and self.bar_width is not None:
741
url_bits.append('chbh=%i' % self.bar_width)
742
zero_line = []
743
if self.zero_lines:
744
for index in xrange(max(self.zero_lines) + 1):
745
if index in self.zero_lines:
746
zero_line.append(str(self.zero_lines[index]))
747
else:
748
zero_line.append('0')
749
url_bits.append('chp=%s' % ','.join(zero_line))
750
return url_bits
751
752
753
class StackedHorizontalBarChart(BarChart):
754
755
def type_to_url(self):
756
return 'cht=bhs'
757
758
759
class StackedVerticalBarChart(BarChart):
760
761
def type_to_url(self):
762
return 'cht=bvs'
763
764
def annotated_data(self):
765
for dataset in self.data:
766
yield ('y', dataset)
767
768
769
class GroupedBarChart(BarChart):
770
771
def __init__(self, *args, **kwargs):
772
if type(self) == GroupedBarChart:
773
raise AbstractClassException('This is an abstract class')
774
BarChart.__init__(self, *args, **kwargs)
775
self.bar_spacing = None
776
self.group_spacing = None
777
778
def set_bar_spacing(self, spacing):
779
"""Set spacing between bars in a group."""
780
self.bar_spacing = spacing
781
782
def set_group_spacing(self, spacing):
783
"""Set spacing between groups of bars."""
784
self.group_spacing = spacing
785
786
def get_url_bits(self, data_class=None):
787
# Skip 'BarChart.get_url_bits' and call Chart directly so the parent
788
# doesn't add "chbh" before we do.
789
url_bits = BarChart.get_url_bits(self, data_class=data_class,
790
skip_chbh=True)
791
if self.group_spacing is not None:
792
if self.bar_spacing is None:
793
raise InvalidParametersException('Bar spacing is required ' \
794
'to be set when setting group spacing')
795
if self.bar_width is None:
796
raise InvalidParametersException('Bar width is required to ' \
797
'be set when setting bar spacing')
798
url_bits.append('chbh=%i,%i,%i'
799
% (self.bar_width, self.bar_spacing, self.group_spacing))
800
elif self.bar_spacing is not None:
801
if self.bar_width is None:
802
raise InvalidParametersException('Bar width is required to ' \
803
'be set when setting bar spacing')
804
url_bits.append('chbh=%i,%i' % (self.bar_width, self.bar_spacing))
805
elif self.bar_width:
806
url_bits.append('chbh=%i' % self.bar_width)
807
return url_bits
808
809
810
class GroupedHorizontalBarChart(GroupedBarChart):
811
812
def type_to_url(self):
813
return 'cht=bhg'
814
815
816
class GroupedVerticalBarChart(GroupedBarChart):
817
818
def type_to_url(self):
819
return 'cht=bvg'
820
821
def annotated_data(self):
822
for dataset in self.data:
823
yield ('y', dataset)
824
825
826
class PieChart(Chart):
827
828
def __init__(self, *args, **kwargs):
829
if type(self) == PieChart:
830
raise AbstractClassException('This is an abstract class')
831
Chart.__init__(self, *args, **kwargs)
832
self.pie_labels = []
833
834
def set_pie_labels(self, labels):
835
self.pie_labels = [urllib.quote(a) for a in labels]
836
837
def get_url_bits(self, data_class=None):
838
url_bits = Chart.get_url_bits(self, data_class=data_class)
839
if self.pie_labels:
840
url_bits.append('chl=%s' % '|'.join(self.pie_labels))
841
return url_bits
842
843
def annotated_data(self):
844
# Datasets are all y-axis data. However, there should only be
845
# one dataset for pie charts.
846
for dataset in self.data:
847
yield ('y', dataset)
848
849
850
class PieChart2D(PieChart):
851
852
def type_to_url(self):
853
return 'cht=p'
854
855
856
class PieChart3D(PieChart):
857
858
def type_to_url(self):
859
return 'cht=p3'
860
861
862
class VennChart(Chart):
863
864
def type_to_url(self):
865
return 'cht=v'
866
867
def annotated_data(self):
868
for dataset in self.data:
869
yield ('y', dataset)
870
871
872
class RadarChart(Chart):
873
874
def type_to_url(self):
875
return 'cht=r'
876
877
878
class SplineRadarChart(RadarChart):
879
880
def type_to_url(self):
881
return 'cht=rs'
882
883
884
class MapChart(Chart):
885
886
def __init__(self, *args, **kwargs):
887
Chart.__init__(self, *args, **kwargs)
888
self.geo_area = 'world'
889
self.codes = []
890
891
def type_to_url(self):
892
return 'cht=t'
893
894
def set_codes(self, codes):
895
self.codes = codes
896
897
def get_url_bits(self, data_class=None):
898
url_bits = Chart.get_url_bits(self, data_class=data_class)
899
url_bits.append('chtm=%s' % self.geo_area)
900
if self.codes:
901
url_bits.append('chld=%s' % ''.join(self.codes))
902
return url_bits
903
904
905
class GoogleOMeterChart(PieChart):
906
"""Inheriting from PieChart because of similar labeling"""
907
908
def type_to_url(self):
909
return 'cht=gom'
910
911
912
class ChartGrammar(object):
913
914
def __init__(self, grammar):
915
self.grammar = grammar
916
self.chart = self.create_chart_instance()
917
918
@staticmethod
919
def get_possible_chart_types():
920
possible_charts = []
921
for cls_name in globals():
922
if not cls_name.endswith('Chart'):
923
continue
924
cls = globals()[cls_name]
925
# Check if it is an abstract class
926
try:
927
cls(1, 1)
928
except AbstractClassException:
929
continue
930
# Strip off "Class"
931
possible_charts.append(cls_name[:-5])
932
return possible_charts
933
934
def create_chart_instance(self):
935
assert('w' in grammar) # width is required
936
assert('h' in grammar) # height is required
937
assert('type' in grammar) # type is required
938
types = ChartGrammar.get_possible_chart_types()
939
if grammar['type'] not in types:
940
raise UnknownChartType('%s is an unknown chart type. Possible '
941
'chart types are %s' % (grammar['type'], ','.join(types)))
942
943
def download(self):
944
pass
945
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0