| Re: Window Background [message #22350] |
Mon, 06 November 2000 00:00 |
eak
Messages: 5
Registered: December 1998
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Junior Member |
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David,
Well in that case I may have a problem...
From the windows command line I tried:
IDL> r = [ 255, 68, 87, 58, 0, 0, 0, 0, 0, 0, 8, 93, 169,
255, 255, 255, 255, 0]
IDL> g = [ 255, 0, 0, 0, 8, 97, 182, 255, 255, 255, 255, 255, 255,
255, 170, 80, 0, 0]
IDL> b = [ 255, 72, 145, 218, 255, 255, 255, 242, 165, 80,0, 0, 0,
0, 0, 0, 0, 0]
IDL> tvlct, r, g, b
IDL> !P.Background = 0
IDL> window
And I get a window with a black background. I'm using IDL 5.2 under NT.
I am actually able to work around this ok by using the fix posted by
Med (Thanks)
erase,color='ffffff'x
And I suppose with a comment in the code I'll even know what's 6 months from
now :).
I did notice that my Windows IDL is 5.2 and 5.3 under Linux. Anyway I'm
mainly posting this to document a solution for
other who might read the group.
Thanks,
BTW: Looking forward to the new book. I'm sure direct graphics solves all
these problems :).
"David Fanning" <davidf@dfanning.com> wrote in message
news:MPG.14706c829a8b0a16989c6c@news.frii.com...
> Eric Kihn (ekihn@ngdc.noaa.gov) writes:
>
>> Since I got such a great response to my last post I thought I'd try one=
>> =20
>> more time. Thanks to JD I got the code running but now the=20
>> behaviour on Windows and Linux is different. On the Linux side my
plot=20
>> window comes up with a white background, on the Windows side a black
one=
>> .
>> Same code and version of IDL 5.3. Since I need the white BG I tried=20
>> !P.BACKGROUND =3D 255 on windows but no change.
>
> What you really should be doing here is setting the background
> color value to the index of the white color in the color
> vectors you are using. You loaded a white color into index
> 0. So your code should look like this:
>
> TVLCT, r, g, b
> !P.Background = 0
>
> *Then* if you don't get what you are looking for,
> you might have other problems.
>
> I tend to prefer to ask for colors by name. I have
> recently upgraded some of the color tools on my
> web page to recognize 88 different colors by name.
> (I even added the capability of adding your own
> color names and values as a color value file.) The
> advantage of this method is that it *always* gives
> me the correct color on all machines and in any
> color decomposition state (if I am using IDL 5.2 or
> higher where I can tell what the color decomposition
> state is).
>
> For example, if I want to create background, axes, and
> data plotting colors, I would write my code like this:
>
> axisColor = FSC_COLOR("Green", !D.Table_Size-2)
> backColor = FSC_COLOR("Charcoal", !D.Table_Size-3)
> dataColor = FSC_COLOR("Yellow", !D.Table_Size-4)
> Plot, Findgen(11), Color=axisColor, Background=backColor, /NoData
> OPlot, Findgen(11), Color=dataColor
>
> This works for all machines in any color decomposition space.
>
> In addition to FSC_COLOR, the new program PICKCOLORNAME will
> allow the user to interactively select a new color name for
> use with FSC_COLOR:
>
> ; Set new data color.
>
> datacolor = PickColorName("Yellow")
> data = Reverse(Findgen(11))
> OPLOT, data, Color=FSC_COLOR(datacolor, !D.Table_Size-4)
>
> To see a list of the 88 colors available, type this:
>
> IDL> Print, FSC_COLOR(/Names)
>
> Or, to see an interactive list of the color names and
> the actual colors:
>
> IDL> color = PickColorName('dark gray')
>
> You can find the programs here:
>
> http://www.dfanning.com/programs/fsc_color.pro
> http://www.dfanning.com/programs/pickcolorname.pro
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438 E-Mail: davidf@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Window Background [message #22365 is a reply to message #22350] |
Mon, 06 November 2000 00:00  |
davidf
Messages: 2866
Registered: September 1996
|
Senior Member |
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Eric Kihn (ekihn@ngdc.noaa.gov) writes:
> Since I got such a great response to my last post I thought I'd try one=
> =20
> more time. Thanks to JD I got the code running but now the=20
> behaviour on Windows and Linux is different. On the Linux side my plot=20
> window comes up with a white background, on the Windows side a black one=
> .
> Same code and version of IDL 5.3. Since I need the white BG I tried=20
> !P.BACKGROUND =3D 255 on windows but no change.
What you really should be doing here is setting the background
color value to the index of the white color in the color
vectors you are using. You loaded a white color into index
0. So your code should look like this:
TVLCT, r, g, b
!P.Background = 0
*Then* if you don't get what you are looking for,
you might have other problems.
I tend to prefer to ask for colors by name. I have
recently upgraded some of the color tools on my
web page to recognize 88 different colors by name.
(I even added the capability of adding your own
color names and values as a color value file.) The
advantage of this method is that it *always* gives
me the correct color on all machines and in any
color decomposition state (if I am using IDL 5.2 or
higher where I can tell what the color decomposition
state is).
For example, if I want to create background, axes, and
data plotting colors, I would write my code like this:
axisColor = FSC_COLOR("Green", !D.Table_Size-2)
backColor = FSC_COLOR("Charcoal", !D.Table_Size-3)
dataColor = FSC_COLOR("Yellow", !D.Table_Size-4)
Plot, Findgen(11), Color=axisColor, Background=backColor, /NoData
OPlot, Findgen(11), Color=dataColor
This works for all machines in any color decomposition space.
In addition to FSC_COLOR, the new program PICKCOLORNAME will
allow the user to interactively select a new color name for
use with FSC_COLOR:
; Set new data color.
datacolor = PickColorName("Yellow")
data = Reverse(Findgen(11))
OPLOT, data, Color=FSC_COLOR(datacolor, !D.Table_Size-4)
To see a list of the 88 colors available, type this:
IDL> Print, FSC_COLOR(/Names)
Or, to see an interactive list of the color names and
the actual colors:
IDL> color = PickColorName('dark gray')
You can find the programs here:
http://www.dfanning.com/programs/fsc_color.pro
http://www.dfanning.com/programs/pickcolorname.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Window Background [message #22370 is a reply to message #22350] |
Sat, 04 November 2000 00:00 |
Med Bennett
Messages: 109
Registered: April 1997
|
Senior Member |
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Eric Kihn wrote:
> Hello all,
>
> Since I got such a great response to my last post I thought I'd try one
> more time. Thanks to JD I got the code running but now the
> behaviour on Windows and Linux is different. On the Linux side my plot
> window comes up with a white background, on the Windows side a black one.
> Same code and version of IDL 5.3. Since I need the white BG I tried
> !P.BACKGROUND = 255 on windows but no change.
>
> [code snipped]
I just do
erase,color='ffffff'x
and then
plot,whatever,color=some_other_color,/noer
This strikes me as totally inelegant but seems to work fine.
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