| Discrete Color Bars [message #65716] |
Sun, 15 March 2009 21:17  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
Colorbar is a nice program, very useful, etc. But it comes
up short when you need a color legend with just a handful
of colors. You have to have fairly specialized knowledge
to get the underlying Plot command to do what you want it
to do. And then you almost always have the problem that
the colorbar annotations do not line up with the actual
colors.
The problem has come home to roost one time too many
when I started to need limited color bars on a regular
basis. Too much fooling around!
So I sat down today and wrote what I wished I had
written years ago: a discrete color bar program, named
DCBar. Annotations are centered under the colors, and
the annotations can be rotated if you need more space.
The color bar can be displayed either horizontally
or vertically, and you can specify the colors you want
to use as color names, color indices into the current
color table, or as 24-bit integers that can be decomposed
into RGB colors. The program works with the other suite
of color programs found in the Coyote Library, and will
need some of them to work properly.
You can learn more about the program and see examples
in this article:
http://www.dfanning.com/color_tips/discretecb.html
The program itself is provided without a paid subscription
on my web page. ;-)
http://www.dfanning.com/programs/dcbar.pro
Donations, of course, are always appreciated and matched
by Coyote before being passed on to worthy organizations
devoted to helping those who need the help.
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: Discrete Color Bars [message #66184 is a reply to message #65716] |
Thu, 23 April 2009 01:06  |
claydodo
Messages: 4
Registered: April 2009
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Junior Member |
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On Apr 23, 1:06 pm, David Fanning <n...@dfanning.com> wrote:
> claydodo writes:
>> I suggest to add an option that can make the labels NOT centered in
>> the middle of the bins, but aligned to the border of them. This would
>> be good for showing value ranges.
>
>> e.g. to make a bar like this:
>> [ | | | ]
>> 0 10 20 30 40
>
>> Just active this feature when ( nElements(labels) EQ ncolors + 1 )
>> would be good.
>
> Well, Colorbar always seems to handle this situation
> pretty well. :-)
>
> 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.")
Ah, I forgot the keyword DIVISION...
Thanks David.
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| Re: Discrete Color Bars [message #66186 is a reply to message #65716] |
Wed, 22 April 2009 22:06 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
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claydodo writes:
> I suggest to add an option that can make the labels NOT centered in
> the middle of the bins, but aligned to the border of them. This would
> be good for showing value ranges.
>
> e.g. to make a bar like this:
> [ | | | ]
> 0 10 20 30 40
>
> Just active this feature when ( nElements(labels) EQ ncolors + 1 )
> would be good.
Well, Colorbar always seems to handle this situation
pretty well. :-)
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: Discrete Color Bars [message #66187 is a reply to message #65716] |
Wed, 22 April 2009 19:05 |
claydodo
Messages: 4
Registered: April 2009
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Junior Member |
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On Mar 16, 12:17 pm, David Fanning <n...@dfanning.com> wrote:
> Folks,
>
> Colorbar is a nice program, very useful, etc. But it comes
> up short when you need a color legend with just a handful
> of colors. You have to have fairly specialized knowledge
> to get the underlying Plot command to do what you want it
> to do. And then you almost always have the problem that
> the colorbar annotations do not line up with the actual
> colors.
>
> The problem has come home to roost one time too many
> when I started to need limited color bars on a regular
> basis. Too much fooling around!
>
> So I sat down today and wrote what I wished I had
> written years ago: a discrete color bar program, namedDCBar. Annotations are centered under the colors, and
> the annotations can be rotated if you need more space.
> The color bar can be displayed either horizontally
> or vertically, and you can specify the colors you want
> to use as color names, color indices into the current
> color table, or as 24-bit integers that can be decomposed
> into RGB colors. The program works with the other suite
> of color programs found in the Coyote Library, and will
> need some of them to work properly.
>
> You can learn more about the program and see examples
> in this article:
>
> http://www.dfanning.com/color_tips/discretecb.html
>
> The program itself is provided without a paid subscription
> on my web page. ;-)
>
> http://www.dfanning.com/programs/dcbar.pro
>
> Donations, of course, are always appreciated and matched
> by Coyote before being passed on to worthy organizations
> devoted to helping those who need the help.
>
> 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.")
Thanks, David.
I suggest to add an option that can make the labels NOT centered in
the middle of the bins, but aligned to the border of them. This would
be good for showing value ranges.
e.g. to make a bar like this:
[ | | | ]
0 10 20 30 40
Just active this feature when ( nElements(labels) EQ ncolors + 1 )
would be good.
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