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###############################################################################
#
# ChartDoughnut - A class for writing the Excel XLSX Doughnut charts.
#
# Copyright 2013-2015, John McNamara, jmcnamara@cpan.org
#
from warnings import warn
from . import chart_pie
class ChartDoughnut(chart_pie.ChartPie):
"""
A class for writing the Excel XLSX Doughnut charts.
"""
###########################################################################
#
# Public API.
#
###########################################################################
def __init__(self, options=None):
"""
Constructor.
"""
super(ChartDoughnut, self).__init__()
if options is None:
options = {}
self.vary_data_color = 1
self.rotation = 0
self.hole_size = 50
def set_hole_size(self, size):
"""
Set the Doughnut chart hole size.
Args:
size: 10 <= size <= 90.
Returns:
Nothing.
"""
if size is None:
return
# Ensure the size is in Excel's range.
if size < 10 or size > 90:
warn("Chart hole size %d outside Excel range: 10 <= size <= 90"
% size)
return
self.hole_size = int(size)
###########################################################################
#
# Private API.
#
###########################################################################
def _write_chart_type(self, args):
# Override the virtual superclass method with a chart specific method.
# Write the c:doughnutChart element.
self._write_doughnut_chart(args)
###########################################################################
#
# XML methods.
#
###########################################################################
def _write_doughnut_chart(self, args):
# Write the <c:doughnutChart> element. Over-ridden method to remove
# axis_id code since Doughnut charts don't require val and cat axes.
self._xml_start_tag('c:doughnutChart')
# Write the c:varyColors element.
self._write_vary_colors()
# Write the series elements.
for data in self.series:
self._write_ser(data)
# Write the c:firstSliceAng element.
self._write_first_slice_ang()
# Write the c:holeSize element.
self._write_c_hole_size()
self._xml_end_tag('c:doughnutChart')
def _write_c_hole_size(self):
# Write the <c:holeSize> element.
attributes = [('val', self.hole_size)]
self._xml_empty_tag('c:holeSize', attributes)