comp.lang.idl-pvwave archive: archive » Re: Another Long Day Compliments of Object Graphics

Home » Public Forums » archive » Re: Another Long Day Compliments of Object Graphics

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Another Long Day Compliments of Object Graphics [message #21211 is a reply to message #21210]

Wed, 16 August 2000 17:12

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"David Fanning" <davidf@dfanning.com> wrote in message
news:MPG.1404d069bf79fd15989bd7@news.frii.com...
> Mark Hadfield (m.hadfield@niwa.cri.nz) writes:
>
>> Plain IDLgrImages are "funny" in other ways. In particular, where images
are
>> involved, visibility is controlled by drawing order, not vertical
position.
>> So moving your colour bar into some other sort of container is a good
idea.
>
> Maybe I'm just plum wore out, but I don't understand this,
> Mark. Could you elaborate?

When I wrote "So moving your colour bar into some other sort of container is
a good idea" I should have written "So representing the colour ramp in your
your colour bar with some sort of atom other than a stand-alone IDLgrImage
is a good idea". I was just agreeing with you--unusual, I admit.

The bit about IDLgrImages being "funny" referred to the fact that they are
two-dimensional objects in an otherwise 3-dimensional object graphics world.
This means (as you pointed out) you can't rotate them satisfactorily. It
also means that you can't control visibility by putting images above or
below other atoms in the Z direction. If you put an image then another atom
into a model, the other atom is visible over the image irrespective of its
vertical position. If you reverse the order in which they are put into the
model, the other atom is not visible over the image, again irrespective of
its vertical position. At least that's what my experience shows.

Of course the general guideline that you should control visibility/overlap
of graphics atoms (other than images) by vertical position and not drawing
order is one of those secrets the IDL documentation doesn't want to tell us.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield/
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

Report message to a moderator

[Message index]

		Re: Another Long Day Compliments of Object Graphics By: Mark Hadfield on Wed, 16 August 2000 19:17
		Re: Another Long Day Compliments of Object Graphics By: Mark Hadfield on Wed, 16 August 2000 17:12
		Re: Another Long Day Compliments of Object Graphics By: Mark Hadfield on Wed, 16 August 2000 16:05
		Re: Another Long Day Compliments of Object Graphics By: davidf on Wed, 16 August 2000 00:00
		Re: Another Long Day Compliments of Object Graphics By: davidf on Wed, 16 August 2000 00:00

Previous Topic:	Re: xplot with overplotting
Next Topic:	Re: Scaling atoms & axes in object graphics

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 21:38:32 PDT 2025

Total time taken to generate the page: 1.51994 seconds