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Re: Adding straight lines to a plot [message #73557 is a reply to message #73472]

Fri, 12 November 2010 06:32

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

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
>
>

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[Message index]

		Re: Adding straight lines to a plot By: fgg on Thu, 11 November 2010 15:22
		Re: Adding straight lines to a plot By: David Fanning on Thu, 11 November 2010 15:02
		Re: Adding straight lines to a plot By: penteado on Thu, 11 November 2010 14:38
		Re: Adding straight lines to a plot By: Paul Van Delst[1] on Fri, 12 November 2010 06:32

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