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Confusion about IDLgrViewgroup [message #77362]

Sat, 27 August 2011 08:42

Jianbao
Messages: 16
Registered: December 2008

Junior Member

Hello folks,

I encountered a counterintuitive behavior when I was using IDLgrViewgroup. Here is the code.

<code>
viewgroup = obj_new('IDLgrViewgroup')
xtitle = obj_new('IDLgrText', string = 'x')
viewgroup->add, xtitle
xAxis = obj_new('IDLgrAxis', direction = 0)
xAxis->SetProperty, title = xtitle
</code>

When I ran this piece of code, IDL gave an error message saying that
% IDLGRAXIS::SETPROPERTY: Objects can only have one parent at a time: TITLE

I got this impression from Modern IDL by Michael Galloy that IDLgrViewgroup is useful to contain attribute objects for convenient destruction. But this example shows that if I use an IDLgrText object as an axis title, I have to destroy it explicitly, which seems absolutely dumb. Or am I missing something here?

Thank you very much.

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[Message index]

		Confusion about IDLgrViewgroup By: Jianbao on Sat, 27 August 2011 08:42
		Re: Confusion about IDLgrViewgroup By: Michael Galloy on Mon, 29 August 2011 11:23

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