| Adding straight lines to a plot [message #73474] |
Thu, 11 November 2010 14:28  |
fgg
Messages: 67
Registered: April 2010
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Member |
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Hi,
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).
Thanks
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| Re: Adding straight lines to a plot [message #73555 is a reply to message #73474] |
Fri, 12 November 2010 06:59  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Paul van Delst writes:
>
> 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], $
>
> ?
Pedantry. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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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
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Senior Member |
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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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