| Using UNIX IDL with display on a PC [message #5626] |
Fri, 19 January 1996 00:00 |
f055
Messages: 29
Registered: April 1995
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Junior Member |
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We have a UNIX (DEC OSF/1, on a DEC Alpha) IDL license, and all graphics etc.
works fine when using a UNIX workstation for display. But some of out users
have IBM PC compatibles, and use Vista eXceed for Windows as an X-windows
server. Thus they can run IDL and see X window graphics and the online help
window. Most of this works, except:
(1) both dotted and dashed linestyles (1 & 2) appear as dashed for default
linethickness (1)! (They work if, say, thick=3).
(2) with the online help, the window appears and so does its contents. When
selecting any new page/topic, it also appears. But when scrolling down through
the current page, nothing new appears - the first page of text just scrolls
off the top. In order to see any help that doesn't appear at the top of its
page, you have to scroll down through the blank document, guess where to stop,
and then minimise the window and then restore it - and suddenly the help
appears.
Anybody had this happen? Anybody solve it?
Cheers,
Tim
......................... Dr Tim Osborn . t.osborn@uea.ac.uk
.... ___/.. __ /.. /.. /. Senior Research Associate . phone:01603 592089
... /..... /. /.. /.. /.. Climatic Research Unit . fax: 01603 507784
.. /..... __/.. /.. /... School of Environmental Sciences.
. /..... /\ ... /.. /.... University of East Anglia .
____/.._/..\_..____/..... Norwich NR4 7TJ .
......................... UK .
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| Re: Using UNIX IDL with display on a PC [message #5629 is a reply to message #5626] |
Fri, 19 January 1996 00:00  |
hahn
Messages: 108
Registered: November 1993
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Senior Member |
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f055@uea.ac.uk (T.Osborn) wrote:
> We have a UNIX (DEC OSF/1, on a DEC Alpha) IDL license, and all graphics etc.
> works fine when using a UNIX workstation for display. But some of out users
> have IBM PC compatibles, and use Vista eXceed for Windows as an X-windows
> server. Thus they can run IDL and see X window graphics and the online help
> window. Most of this works, except:
We use HCL eXceed/w. I don't know if this is the same as Vista eXceed.
> (1) both dotted and dashed linestyles (1 & 2) appear as dashed for default
> linethickness (1)! (They work if, say, thick=3).
I haven't verified this yet but IDL may use linethickness 0 as a
default. That should make the server to use the fastest line drawing
algorithm which may not exactly represent you the client (user)
expects. When use request thick=3 the X server must use a faithfull
representation. However, you can select on your X Server on how
to behave when linethickness=0 is transmitted. Use Xconfig and
select Performace. Then check "zero line width" . The help text
for this item:
[begin of quoted text]
"Exact Zero-Width Lines (Performance Settings)
"The X protocol states that zero-width (thin) lines are one pixel wide
lines drawn using an unspecified,
device-dependent algorithm. A line-width of zero may differ from a
line-width of one in which pixels are
drawn. This permits the use of many manufacturers' line drawing
hardware, which may run faster than the
more precisely specified wide lines.
"By default, the eXceed server allows Microsoft Windows to directly
draw zero-width lines. This method is
generally much faster than the exact pixel algorithm used by X to draw
lines of other widths. If you wish to
force exact line drawing for zero-width lines, check this option.
"Note: Certain video drivers ignore color information on some styles
of zero-width line drawing. If lines
appear in an incorrect color, or do not appear at all, check this
option.
[end of quoted text]
> (2) with the online help, the window appears and so does its contents. When
> selecting any new page/topic, it also appears. But when scrolling down through
> the current page, nothing new appears - the first page of text just scrolls
> off the top. In order to see any help that doesn't appear at the top of its
> page, you have to scroll down through the blank document, guess where to stop,
> and then minimise the window and then restore it - and suddenly the help
> appears.
> Anybody had this happen? Anybody solve it?
I can remember it: I saw this phenomenon when I installed IDL 4.0 last
summer. The online help is incredibly slow on our unix cluster, so I
prefer the MS Windows Online Help. In the meanwhile we upgraded
to HCL eXceed Version 5.0 and I checked IDL help with this verion:
The problem has disappeared!
> Cheers,
> Tim
> ......................... Dr Tim Osborn . t.osborn@uea.ac.uk
> .... ___/.. __ /.. /.. /. Senior Research Associate . phone:01603 592089
> ... /..... /. /.. /.. /.. Climatic Research Unit . fax: 01603 507784
> .. /..... __/.. /.. /... School of Environmental Sciences.
> . /..... /\ ... /.. /.... University of East Anglia .
> ____/.._/..\_..____/..... Norwich NR4 7TJ .
> ......................... UK .
I hope this help
Norbert Hahn
University of Darmstadt
Germany
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