randym/axlsx — pull request #254 by skateinmars (2013-10-09 09:40:49+00:00)
Title: Add support for bubble charts

This pull request fixes https://github.com/randym/axlsx/issues/253
Only basic options are supported (x/y values and bubble size)

Here is how to add a bubble chart:
```
sheet.add_chart Axlsx::BubbleChart do |chart|
chart.start_at 0, 0
chart.end_at 20, 20

chart.title.text = "Bubble pop"

chart.add_series xData: sheet["A1:A3"],
yData: sheet["B1:B3"],
bubbleSize: sheet["C1:C3"]
end
```

Tests were added for basic XML output validation (similar to the scatter tests ones), I'm not really sure how to test anything specific about the bubble chart.