GetPlotAttribute and SetPlotAttribute of a Rectangel?

[Stuttgart]

how can i use GetPlotAttribute to obtain the (double x1, double y1, double x2, double y2) of a Rectangel which is plotted by PlotRectangle. And then use SetPlotAttribute to reset them or replot this rectangel when the resetting is impossible?

any suggestions are appreciated!

Thanks

Jiafei Peng

[DaveC]

Jiafei,

You can use the PlotPolygon function, which will do the same thing for you as PlotRectangle, then you can use the  ATTR_PLOT_XDATA and ATTR_PLOT_YDATA attributes of GetPlotAttribute to get the x and y data from a plot.

[RobertoBozzolo]

In addition to Dave suggestion, please note that you cannot modify plot data: you will need to always delete previous plot and redraw a new rectangle with updated values.

Message Edited by Roberto Bozzolo on 07-24-2006 08:55 AM

[Stuttgart]

Dave and Roberto,

thank you very much for your suggestions.  I have already succesefully applied PlotPolygon. And it works exactly like required.

because ATTR_PLOT_XDATA and ATTR_PLOT_YDATA  can be obtained easily by GetPlotAttribute and then redraw this Polygon.

Thanks again

sincerely

Jiafei