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Re: How to use backing store while using object graphics? [message #54427 is a reply to message #54426]

Sat, 09 June 2007 19:36

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Robert Chuang writes:

> I don't know how to let IDL back store the display, note that I've
> written "device, retain=2" in the IDL_startup.pro file, and it works
> fine while using direct graphics.
>
> Here is an example,
>
> PRO test_gui
> COMPILE_OPT, IDL2
> mywindow = OBJ_NEW('IDLgrWindow') ;;retain=2
> myview = OBJ_NEW('IDLgrView', VIEWPLANE_RECT=[0, 0, 19, 19])
> mymodel = OBJ_NEW('IDLgrModel')
> data = DIST(20)
> mycontour = OBJ_NEW('IDLgrContour', data, COLOR=[100, 150, 200], $
> C_LINESTYLE=[0, 2, 4], /PLANAR, GEOMZ=0, C_VALUE=INDGEN(20))
> myview->Add, mymodel
> mymodel->Add, mycontour ;how to set backup storage?
> mywindow->Draw, myview
> END
>
> The display will disappear while overlay, minimize and maximize the
> window, the "device, retain=2" command doesn't work any more. How to
> fix it?

It is exceedingly rare (this is the only program I've
ever seen that did it!) to see an object graphics program
that doesn't draw into a draw widget window. So, normally,
this problem is solved by turning EXPOSE events on for
the draw widget and then just drawing the view in the
draw widget event handler when the window is "exposed".

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: How to use backing store while using object graphics? By: rkombiyil on Sun, 10 June 2007 08:07
		Re: How to use backing store while using object graphics? By: David Fanning on Sat, 09 June 2007 20:49
		Re: How to use backing store while using object graphics? By: zhuangbao@gmail.com on Sat, 09 June 2007 20:41
		Re: How to use backing store while using object graphics? By: David Fanning on Sat, 09 June 2007 19:41
		Re: How to use backing store while using object graphics? By: David Fanning on Sat, 09 June 2007 19:36
		Re: How to use backing store while using object graphics? By: Robbie on Sat, 09 June 2007 19:25

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