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Re: IDLgrWindow->Draw,/CREATE_INSTANCE [message #18112 is a reply to message #18032]

Mon, 29 November 1999 00:00

Marc Schellens
Messages: 14
Registered: November 1999

Junior Member

Oh, oh, seems that I was a litte bit rash here.
Well, with TRANSPARENT keyword it works fine for me also.

So thank you very much! I think I should come clear now.

But David, could you please specify what are the other things
(except missing /TRANSPARENT) wrong in my example code?
Well, the IDL example code uses the instancing as you in your example
code, but I found nowhere said, that it *must* be done this way (or at
least I haven't found it in the documentation), have I overseen
something?

After feeling ashamed about such an simple mistake I looked for the
original code, which made me believe for a long time, that the
DRAW_INSTANCE/CREATE_INSTANCE did not work.
(BTW: this code comes from an IDL training course held here some time
ago.)
I include it at the bottom. Please check it out.
Obviously the problem is that the IDLgrViews did not cover the whole
window here. However, under NT it works fine, but under Solaris the old
picture is not cleared before drawing it a little bit shifted.
So at least an inconsistency. (IDL 5.2)

thanks, :-) marc
------------------------------------------------------------ ------------

pro obj_win

people_a=bytarr(192,192)
people_b=people_a
openr,lun,filepath('people.dat',subdirectory='examples/data' ),/get_lun
readu,lun,people_a
readu,lun,people_b
free_lun,lun

oview_a=obj_new('idlgrview',$
viewplane_rect=[0,0,192,192],dimension=[192,192],$
zclip=[1,-1],location=[0,0])
oview_b=obj_new('idlgrview',$
viewplane_rect=[0,0,192,192],dimension=[192,192],$
zclip=[1,-1],location=[50,50])

oview_b->SetProperty,Transpar=1

omodel_a=obj_new('idlgrmodel')
omodel_b=obj_new('idlgrmodel')

oimage_a=obj_new('idlgrimage',people_a)
oimage_b=obj_new('idlgrimage',people_b)

omodel_a->add,oimage_a
omodel_b->add,oimage_b

oview_a->add,omodel_a
oview_b->add,omodel_b

owindow=obj_new('idlgrwindow',dimensions=[400,400],retain=2)

; The Keywords Create_Instance and Draw_Instance in the Draw
; method of the IDLgrWindow.

owindow->draw,oview_a,/create_instance ;The unchanging part of a
drawing.

for i=50,90,5 do begin
oview_b->setproperty,location=[i,i]
owindow->draw,oview_b,/draw_instance ;The changing part of a drawing.
endfor

end

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[Message index]

		IDLgrWindow->Draw,/CREATE_INSTANCE By: Marc Schellens on Fri, 26 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: Ben Tupper on Mon, 29 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: davidf on Mon, 29 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: Marc Schellens on Mon, 29 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: Ben Tupper on Sun, 28 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: davidf on Sun, 28 November 1999 00:00
		Re: IDLgrWindow->Draw,/CREATE_INSTANCE By: Marc Schellens on Sun, 28 November 1999 00:00

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