Added setFirstSliceAngle to Doughnut Chart

[seanlynchwv]

Description

We needed the ability to create a half circle from 270' to 90' but it was not working

This is now fixed by adding a new ->setFirstSliceAngle( int ); helper to Doughnut.php

Previously this was hard-coded to 0. Over-writing this did not work as <c:view3D> was imported into every chart which was conflicting with the rule.

After debugging the output from powerpoint itself, I learned that we can fix this by making <c:view3D> conditional. Now making programatic changes to 2d charts works as expected.

It now works:

            $real = [15, 25, 30, 20, 10];
            $dummy = array_sum($real);
            $values = array_merge([$dummy], $real);

            $doughnut = (new Doughnut())
                ->setHoleSize(75)
                ->setFirstSliceAngle(90);

            $series = new Series('Gauge', $values);
            $series->setShowValue(false);
            $doughnut->addSeries($series);

            /* make the dummy slice transparent */
            $series->getDataPointFill(0)
                ->setFillType(Fill::FILL_SOLID)
                ->setStartColor(new Color('00FFFFFF'));

            $chart = $slide->createChartShape()
                ->setName('Gauge')
                ->setResizeProportional(false)
                ->setOffsetX($offsetX)
                ->setOffsetY($offsetY)
                ->setWidth($w)
                ->setHeight($h);

            $chart->getPlotArea()->setType($doughnut);
            $chart->getLegend()->setVisible(false);
            $chart->getTitle()->setVisible(false);

Fixes # (issue)

Checklist:

• My CI is 🟢
• I have covered by unit tests my new code (check build/coverage for coverage report)
• [o] I have updated the documentation to describe the changes - not yet, its still TODO
• I have updated the changelog - not yet

[seanlynchwv]

Sorry did not mean to create a PR here which happened automatically when I created a PR on my copy of the repo. Will try to submit a PR later if I can get the doughnut rotation working as expected

[coveralls]

coverage: 91.643% (+0.004%) from 91.639%
when pulling deaec5e on seanlynchwv:feature/angle-rotation
into b9cdcd4 on PHPOffice:master.