feat(chart): doughnut hole size and first-slice angle - #1136
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Implements the long-standing request (issue scanny#493) to control the doughnut chart hole through the API, plus the sibling rotation control: - DoughnutPlot.hole_size (c:holeSize@val, 1..90, default 10) - DoughnutPlot.first_slice_angle (c:firstSliceAng@val, 0..360, default 0) Adds CT_DoughnutHoleSize/CT_FirstSliceAng element classes, accessors on CT_DoughnutChart, and ST_HoleSize/ST_FirstSliceAng simple types with range validation. Tests: tests/chart/test_plot_ext.py (6); upstream tests/chart & tests/oxml unchanged.
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Read/write int property (0..359 degrees, clockwise from 12 o'clock) on DoughnutPlot, mapped to the <c:firstSliceAng> element of c:doughnutChart via new ST_FirstSliceAng / CT_FirstSliceAng oxml plumbing. Works on charts opened from a file and on charts created with add_chart; CategoryChartData.first_slice_angle bakes the angle into newly created doughnut charts through the chart XML writer. Port of scanny#1136 (and scanny#350) by vitordj and jbq.
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Implements the long-standing request (issue #493) to control the doughnut chart hole through the API, plus the sibling rotation control:
Adds CT_DoughnutHoleSize/CT_FirstSliceAng element classes, accessors on CT_DoughnutChart, and ST_HoleSize/ST_FirstSliceAng simple types with range validation. Tests: tests/chart/test_plot_ext.py (6); upstream tests/chart & tests/oxml unchanged.