| Draw widget updates and mouse movement [message #20380] |
Wed, 21 June 2000 00:00  |
nilsj
Messages: 6
Registered: May 1999
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Junior Member |
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A program I wrote creates a WIDGET_DRAW, does a LOAD_CT, then displays an
image using TV. However, the new color table does not take effect until
the mouse pointer moves over the draw widget. How can I force this color
table to take effect immediately?
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| Re: Draw widget updates and mouse movement [message #20453 is a reply to message #20380] |
Thu, 22 June 2000 00:00  |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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Jared Crossley wrote:
> I have a similar problem. When I display an image and load a color
> table the colors do not appear until I move my mouse pointer over the
> image window. However, when my pointer is over the image window,
> everything on my screen changes color.
>
> I am using 24 bit color. If I try to switch to 8 bit via
>
> device, pseudo=8
>
> when I try to display an image I get an error message:
>
> % Unsupported X Windows visual (class: PseudoColor, depth: 8).
> Substituting default (class: TrueColor, Depth: 24).
>
> I would prefer to use 24 bit anyway. My question is: Why does
> everything on my screen change colors when my mouse moves over the
> display window, and is there a way to fix this problem?
>
> I am running IDL 5.3 (linux x86).
Your X server does not support 8-bit visuals when the desktop is set to
24-bits per pixel (this is quite common in the Linux world). If your
desktop is set to 16 bits per pixel, then IDL may act unreliably because
IDL does not support 16-bit UNIX displays. I believe 16-bit displays are
only handled properly on Windows and MacOS platforms.
If your desktop is set to 16 bits per pixel, try setting it to 8 or 24
bits per pixel.
Did you try using the IDL startup file I posted with 'true_color=24'
instead of 'pseudo_color=8'?
Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley
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| Re: Draw widget updates and mouse movement [message #20455 is a reply to message #20380] |
Thu, 22 June 2000 00:00 |
Jared Crossley
Messages: 3
Registered: June 2000
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Junior Member |
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I have a similar problem. When I display an image and load a color
table the colors do not appear until I move my mouse pointer over the
image window. However, when my pointer is over the image window,
everything on my screen changes color.
I am using 24 bit color. If I try to switch to 8 bit via
device, pseudo=8
when I try to display an image I get an error message:
% Unsupported X Windows visual (class: PseudoColor, depth: 8).
Substituting default (class: TrueColor, Depth: 24).
I would prefer to use 24 bit anyway. My question is: Why does
everything on my screen change colors when my mouse moves over the
display window, and is there a way to fix this problem?
I am running IDL 5.3 (linux x86).
Thanks, Jared
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