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Re: How to make color-scale legend [message #999 is a reply to message #852]

Tue, 13 April 1993 06:46

thompson
Messages: 584
Registered: August 1991

Senior Member

ruckman@oasys.dt.navy.mil writes:

(Stuff deleted)

> I had to make a minor modification that I suspect is needed often by users of
> IDL for Windows. The procedures use different techniques depending on the
> current device, but they were written before the 'WIN' device existed.
> Therefore, whenever I found a command such as

> if !d.name eq 'X' then begin

> I had to change it to

> if !d.name eq 'X' or !d.name eq 'WIN' then begin

Even better would be to just ask if the device has windows, e.g.

if have_windows() then begin

The following routines will test if a device supports windows and widgets
(which I understand that IDL for Windows now supports).

FUNCTION HAVE_WINDOWS
RETURN,(!D.FLAGS AND 256) NE 0
END

FUNCTION HAVE_WIDGETS
RETURN,(!D.FLAGS AND 65536) NE 0
END

One could simply put the references to !D.FLAGS directly into the calling
routine, but I feel that putting them into separate routines like this makes
for more understandable code.

This way you don't have to keep adding device names to your routines, e.g.
"or !d.name eq 'SUN'" in your example above.

Bill Thompson

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[Message index]

		Re: How to make color-scale legend By: ian on Mon, 12 April 1993 15:35
		Re: How to make color-scale legend By: thompson on Tue, 13 April 1993 06:46
		Re: How to make color-scale legend By: ruckman on Tue, 13 April 1993 03:15

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