getDrawArea()

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.makeChart or BaseChart.makeChart2), the custom drawings will be at the background of the chart.

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A DrawArea object that can be used to add custom text and shapes to the chart.