Sets the size of the icon(s) to be used in legend box.
By default, if a legend box is available on the chart, ChartDirector will insert an legend entry for any named data sets in the legend box. The icons for the data sets will be the shape of the bars. The size of the icons will be determined using the key size settings of the legend box (see LegendBox.setKeySize
This method can be used to override the legend box settings to specify a custom width/height for the icons of the current BarLayer.
If the icon size is set to 0, a square color box will be used as the icon regardless of the shape of the bar.
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