You use the BarChart control to represent data as a series of horizontal bars whose length is determined by values in the data. You can use the BarChart control to represent a variety of chart variations, including clustered bars, overlaid stacked, 100% stacked, and high-low areas.
You use the BubbleChart control to represent data with three values for each data point: a value that determines its position along the x-axis, a value that determines its position along the y-axis, and a value that determines the size of the chart symbol, relative to the other data points on the chart.
The <mx:BubbleChart> tag takes an additional property, maxRadius. This property specifies the maximum radius of the largest chart element, in pixels. The data point with the largest value is assigned this radius; all other data points are assigned a smaller radius based on their value relative to the largest value. The default value is 30 pixels.
The following figure shows an example of a bubble chart:
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