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A wing chart ( or tornado chart ) is a special type of column chart ( or bar chart ), where two columns ( or bars ) are spread over both sides of the axis. The wing chart is useful to compare two categories of data and to provide decision makers with a quick overview.

The <Column2DWingChart> element tag is used to create a column-type wing chart in KoolChart, and the series element tag for the column-type wing chart is <Column2DWingSeries>.

If you want to create a column-type wing chart with multiple series data, create as many <Column2DWingSeries> element tags as you want as a child node of the <series> element tag which is a child node of the <Column2DWingChart> element tag.

...
<Column2DWingChart ... >
  ...
  <series>
    <Column2DWingSeries yField="income1" yFieldOpp="expenditure1" ... >
      ...
    </Column2DWingSeries>
    
    <Column2DWingSeries yField="income2" yFieldOpp="expenditure2" ... >
      ...
    </Column2DWingSeries>
  </series>
  ...
</Column2DWingChart>
...

<Column2DWingSeries>

yField The yField attribute determines the field name of the upper wing of the vertical axis ( verticalAxis ).
yFieldOpp The yFieldOpp attribute determines the field name of the lower wing of the vertical axis ( verticalAxis ).

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