2の方法が考えられます。
(1) If the chart is displayed as an applet, like API example #42, then the line can be drawn dynamically with mouse by adding java mouse-handler codes to the source of this example.
Please note that this approach works only with the applet display.
Once the line is added to the applet, the applet may be printed or saved into JPEG format on the server side, and the JPEG can then be downloaded to the client.
help/examples/example1.html を参照ください。
(2) Other ideas include (servlet) esporting the chart in .bmp format, then you may add line to the bmp file by double clicking the bmp file on windows.
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