Retrieves the internal DrawArea
object that is used to draw the chart.
The most common reason of accessing the internal DrawArea
object is to add custom drawings (lines, texts, shapes, etc) to the chart.
If the custom drawings are drawn before drawing the chart image (eg. using BaseChart.makeWebImage
), the custom drawings will be at the background of the chart.
object that can be used to add custom text and shapes to the chart.
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