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Re: Adding straight lines to a plot [message #73556 is a reply to message #73474]

Fri, 12 November 2010 06:37

Gray
Messages: 253
Registered: February 2010

Senior Member

On Nov 12, 9:32 am, Paul van Delst <paul.vande...@noaa.gov> wrote:
> David Fanning wrote:
>> fgg writes:
>
>>> Is there a function in IDL to add a straight line through an existing
>>> plot? Something like the 'abline' function in R, where all you need is
>>> to specify the y-value for a horizontal line (or the x-value for a
>>> vertical line).
>
>> Here you go.
>
>> PRO ABLine, value, $
>> VERTICAL=vertical, $
>> LINESTYLE=linestyle, $
>> THICK=thick, $
>> COLOR=color
>
>> IF N_Elements(color) EQ 0 THEN color = 'white'
>
>> IF Keyword_Set(Vertical) THEN BEGIN
>> PLOTS, [value, value], [!Y.CRange[0], !Y.CRange[1]], $
>
> why not simply
> PLOTS, [value, value], !Y.CRange, $
>
>> LINESTYLE=linestyle, THICK=thick, $
>> COLOR=FSC_Color(String(color))
>> ENDIF ELSE BEGIN
>> PLOTS, [!X.CRange[0], !X.CRange[1]], [value, value], $
>
> and similarly
> PLOTS, !X.CRange, [value, value], $
>
> ?
>
>
>
>
>
>
>
>> LINESTYLE=linestyle, THICK=thick, $
>> COLOR=FSC_Color(color)
>> ENDELSE
>
>> END
>
>> Cheers,
>
>> David

You can do the same thing in NG with polyline(/data), where xrange and
yrange are properties of the graphic object.

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[Message index]

		Adding straight lines to a plot By: fgg on Thu, 11 November 2010 14:28
		Re: Adding straight lines to a plot By: David Fanning on Fri, 12 November 2010 06:59
		Re: Adding straight lines to a plot By: Gray on Fri, 12 November 2010 06:37

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