* Additional Support for Chart DataSeriesValues
Fix#2863. DataSeriesValues now extends Properties, allowing it to share code in common with Axis and Gridlines. This causes some minor breakages; in particular line width is now initialized to null instead of Excel's default value, and is specified in points, as the user would expect from Excel, rather than the value stored in Xml.
This change:
- adds support for 1 or 2 marker colors.
- adds support for `smoothLine` to DataSeriesValues.
- will determine `catAx` or `valAx` for Axis based on what is read from the Xml when available, rather than guessing based on format. (Another minor break.)
- reads `formatCode` and `sourceLinked` for Axis.
- correct 2 uses of `$plotSeriesRef` to `$plotSeriesIndex` in Writer/Xlsx/Chart.
- pushes coverage over 90% for Chart (88.70% overall).
* Update Change Log
I had updated previously but forgot to stage the member.
* Adopt Some Suggestions
Incorporate some changes suggested by @bridgeplayr.
* Use ChartColor for DSV Fill And Font Text
DataSeriesValues Fill could be a scalar or an array, so I saved it till last.
* Some Final Cleanup
No code changes.
Illustrate even more of the new features in existing sample files.
Deprecate *_ARGB in Properties/ChartColors in favor of *_RGB, because it uses only 6 hex digits. The alpha value is stored separately.
Jpgraph does not use namespaces. Neither do the Samples members of this project. As a result, Scrutinizer complains about 13 cases of `use PhpOffice\PhpSpreadsheet\Chart\Legend;`, since this theoretically could cause the use of two different Legend classes in the empty namespace. It suggests using a class alias for Legend, which this PR does in every applicable case. It is a regrettable problem, but it is easy to fix.
All chart examples passed the displayBlanksAs parameter as 0 instead of 'gap'.
I added a constants EMPTY_AS_GAP, EMPTY_AS_ZERO and EMPTY_AS_SPAN to the
DataSeries and then change all chart samples to use this new constant.
Fixes#1337Closes#1448
oleibman
Chris Wolcott
Adrien Crivelli
Michael Bollman