| Re: Draw widget updates and mouse movement [message #20376] |
Wed, 21 June 2000 00:00 |
Liam E. Gumley
Messages: 378
Registered: January 2000
|
Senior Member |
|
|
Nils Johnson wrote:
> 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?
I'm guessing you are logged in at the console of a UNIX box. Try this:
(1) Exit from any IDL sessions you have running.
(2) If you have a $HOME/.Xdefaults file, make sure it contains no
IDL-related entries.
(3) Paste the following lines into a file named $HOME/idl_startup.pro
;- Generic platform independent IDL startup file
if !version.os_family eq 'unix' then device, pseudo_color=8
window, /free, /pixmap, colors=-10
wdelete, !d.window
device, decomposed=0, retain=2, set_character_size=[10, 12]
device, get_visual_depth=depth
print, 'Display depth: ', depth
print, 'Color table size: ', !d.table_size
(3) Set the environment variable IDL_STARTUP to the startup file
path/name, e.g.
% setenv IDL_STARTUP $HOME/idl_startup.pro
or
$ export IDL_STARTUP=$HOME/idl_startup.pro
(4) Start a new IDL session and try the following commands:
IDL> tvscl, dist(256)
IDL> loadct, 13
If the colors in the image immediately change to a rainbow scale, then
you have successfully started IDL in 8-bit display mode (which is what
you want, I think).
If you ever decide you would like to run IDL in 24-bit mode instead,
replace 'pseudo_color=8' with 'true_color=24' in the startup file. In
24-bit mode, the image must be re-displayed for color table changes to
be visible.
Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
