| Re: What color should it be? [message #79988] |
Thu, 19 April 2012 20:04 |
Xin Tao
Messages: 40
Registered: April 2011
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Member |
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Thanks for the explanation. That seems to be the solution.
Anyway, it's really unfortunate. This seems to be something that's really basic.
Xin Tao
On Thursday, April 19, 2012 2:47:45 PM UTC-5, David Fanning wrote:
> Xin Tao writes:
>
>> I'm using IDL 8.1 from a Mac terminal. One strange thing that I don't understand is the color of the lines in the following command:
>>
>> plot, [0], color = !p.color
>>
>> If I just entere IDL, and type the command, the color is red, because !p.color is 255. I don't know why it's 255 by default but I know it's red in the X device. But the strange thing is if I type the command again, it becomes white! And !p.color is 16777215. So does anyone know why this is the case?
>>
>> I normally don't use PLOT command myself (use CGPLOT:)). This is to debug someone else's code.
>
> I would guess this bug in all X Windows versions of IDL
> has something to do with it:
>
> http://www.idlcoyote.com/graphics_tips/firstblank.php
>
> But, don't think of this as some inexplicable mystery to be
> explained. Rather, think of it as an opportunity to educate
> a fellow IDL user to graphics commands that actually work. :-)
>
> Cheers,
>
> David
>
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: What color should it be? [message #79989 is a reply to message #79988] |
Thu, 19 April 2012 12:47  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Xin Tao writes:
> I'm using IDL 8.1 from a Mac terminal. One strange thing that I don't understand is the color of the lines in the following command:
>
> plot, [0], color = !p.color
>
> If I just entere IDL, and type the command, the color is red, because !p.color is 255. I don't know why it's 255 by default but I know it's red in the X device. But the strange thing is if I type the command again, it becomes white! And !p.color is 16777215. So does anyone know why this is the case?
>
> I normally don't use PLOT command myself (use CGPLOT:)). This is to debug someone else's code.
I would guess this bug in all X Windows versions of IDL
has something to do with it:
http://www.idlcoyote.com/graphics_tips/firstblank.php
But, don't think of this as some inexplicable mystery to be
explained. Rather, think of it as an opportunity to educate
a fellow IDL user to graphics commands that actually work. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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