Generates the chart image and save it into a file.
ChartDirector supports PNG, JPG, GIF, WBMP, BMP, SVG and SVGZ. The format used is selected based on file extension, which should be png, jpg, jpeg, gif, wbmp, wmp, bmp, svg or svgz.
Note: To output true vector graphics in SVG or SVGZ format, please ensure
BaseChart.enableVectorOutput is called immediately after creating the BaseChart object. Otherwise the output will be a bitmap image embedded in SVG or SVGZ.
A true (non-zero) value indicates no error. A false (zero) value indicates the operation is unsuccessful.
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