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Re: Object boundaries [message #40334 is a reply to message #40209]

Mon, 02 August 2004 13:19

Michael Wallace
Messages: 409
Registered: December 2003

Senior Member

>> While this works, is there any way to remove the call to xobjview? When
>> I remove that call and try the code, I get back 0.0 for all of the tick
>> text ranges. Is this because IDL doesn't know where it is before it's
>> drawn?
>
>
> Probably. The text objects really don't know how big they are
> until their dimensions are computed. I presume this occurs just
> before they are displayed the first time.

It seems to me that it should be a fairly common problem then... you
want to do some smart positioning of text objects. You have text object
1 which is placed somewhere. It needs to get drawn, and then text
object 2 can be placed smartly (since text object one now has correct
dimension numbers). Now, to see text object 2, you have to draw again.
So, in order to get everything positioned just right, it appears that
you have to go through multiple draw operations.

Maybe there's something preventing this from being done, but why
couldn't the text object at least calculate ahead of time where it falls
on the view plane? Of course, I'd want that calculation to be lazy so
that it doesn't get called every time you apply a transformation or
twiddle some parameter, but there could be a method which would
calculate those numbers given the current setup of the view. In essence
this would be a Draw command, except nothing would really get drawn and
it'd only apply to the text object (and any related object such as an
axis that it's a property of). Then whenever I need to know those
numbers, I could just call that method on the object and then get the
[XYZ]RANGE properties which will now be filled in correctly.

That's enough IDL theory for now. Time to get back to making pretty plots.

-Mike

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[Message index]

		Object boundaries By: Michael Wallace on Tue, 27 July 2004 10:56
		Re: Object boundaries By: James Kuyper on Tue, 03 August 2004 07:46
		Re: Object boundaries By: mperrin+news on Wed, 04 August 2004 14:41
		Re: Object boundaries By: Rick Towler on Mon, 02 August 2004 16:05
		Re: Object boundaries By: Karl Schultz on Mon, 02 August 2004 15:44
		Re: Object boundaries By: David Fanning on Mon, 02 August 2004 14:58
		Re: Object boundaries By: Paul Van Delst[1] on Mon, 02 August 2004 14:54
		Re: Object boundaries By: Rick Towler on Mon, 02 August 2004 14:38
		Re: Object boundaries By: David Fanning on Mon, 02 August 2004 14:11
		Re: Object boundaries By: Michael Wallace on Mon, 02 August 2004 13:46
		Re: Object boundaries By: David Fanning on Mon, 02 August 2004 13:32
		Re: Object boundaries By: Michael Wallace on Mon, 02 August 2004 13:19
		Re: Object boundaries By: David Fanning on Mon, 02 August 2004 12:44

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