A combo chart shows at least two charts in the same chart. The charts shown can be of a same type or not. The combo chart gives a possibility to show many kinds of data in the same chart.
Each chart to be shown has it's own data model. The data model for
charts is almost the same as when data is shown in normal charts like
bar or scatter chart. The data for charts in
combo chart has an additional group attribute that is
used for determining which data is used for which chart.
Because values in different charts in a combo chart can have
totally different values, each chart has it's own axes. The axes of
different charts can coincide with each other but that is not
necessary. For linking an axes and data together, the axes tag has a
dataGroup attribute that tells which data is used for
which chart. The value of the dataGroup attribute should
match with the value of group attribute in data. The
chart in question for an axes tag is determined with a
subChartType attribute in an axes tag.
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| Line and column combo chart, with shared axes. |
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| Line and column combo chart, with separate Y-axis. |
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| Complex combo chart, with separate axes. |