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Re: how to shade region of 2-D plot [message #13532 is a reply to message #13529]

Thu, 19 November 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Joseph Scott Stuart (nospam@ll.mit.edu) writes:

> Is there a relatively painless way to shade a region on a 2-D plot?
> Baically, I have a computed function that I want to plot with error
> bars, and I'd like to plot the error bars as a shaded region around
> the plotted nominal value. I could just plot error bars with the
> points and play around with spacing between the points and the line
> thickness of the error bars until it sort of looks like a shaded
> region, but is there a nicer way to do it?

I think I would just do this with PolyFill and specify the
shaded region in data coordinates (Data keyword). You will have
to draw the PolyFill areas first, but of course, you won't
*have* the data coordinates at this point. I'd probably solve
the problem by first drawing the plot to a pixmap to set up
the plot scaling vectors. Then draw my shaded regions in
the display window and plot the actual data with a NoErase
keyword set.

(Don't forget to delete that pixmap!) :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
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[Message index]

		Re: how to shade region of 2-D plot By: davidf on Thu, 19 November 1998 00:00
		Re: how to shade region of 2-D plot By: steinhh on Thu, 19 November 1998 00:00
		Re: how to shade region of 2-D plot By: davidf on Thu, 19 November 1998 00:00

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