def pieChart(fd,
width,
height,
title,
data,
labels,
bgColor=None,
labelColor='#000000',
colorScheme=DEFAULT_COLOR):
dataSet = [(name, [[0, value]]) for name, value in izip(labels, data)]
axisLabels = [dict(v=i, label=label) for i, label in enumerate(labels)]
options = Option(title=title,
titleFont='Times',
titleFontSize=24,
pieRadius=0.35,
legend=Option(hide=True),
colorScheme=colorScheme,
background=Option(baseColor=bgColor),
axis=Option(labelColor=labelColor,
x=Option(ticks=axisLabels)))
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
chart = PieChart(surface, options)
chart.addDataset(dataSet)
chart.render()
surface.write_to_png(fd)
def _updateTicks(self):
"""Evaluates pie ticks"""
self.xticks = []
if self.options.axis.x.ticks:
lookup = dict([(slice.xval, slice) for slice in self.slices])
for tick in self.options.axis.x.ticks:
if not isinstance(tick, Option):
tick = Option(tick)
slice = lookup[tick.v]
label = tick.label or str(tick.v)
if slice:
label += ' (%.1f%%)' % (slice.fraction * 100)
self.xticks.append((tick.v, label))
else:
for slice in self.slices:
label = '%s (%.1f%%)' % (slice.xval, slice.fraction * 100)
self.xticks.append((slice.xval, label))
def _updateTicks(self):
"""Evaluates pie ticks"""
self.xticks = []
lookups = [key for key in self.slices.keys()]
if self.options.axis.x.ticks:
ticks = [tick['v'] for tick in self.options.axis.x.ticks]
if frozenset(lookups) != frozenset(ticks):
#TODO: Is there better option than ValueError?
raise ValueError(u"Incompatible ticks")
for tick in self.options.axis.x.ticks:
if not isinstance(tick, Option):
tick = Option(tick)
label = tick.label or str(tick.v)
self.xticks.append((tick.v, label))
else:
for i in lookups:
self.xticks.append((i, u"%s" % i))