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Re: Widget_Draw - Help [message #27338 is a reply to message #27337]

Thu, 18 October 2001 14:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Logan Lindquist (llindqusit@mrdoc.cc) writes:

> I figured I would start with something easy, trying to create widget
> that displays images in Widget_Draw. I am trying to pass the wdraw
> variable in a Struct to the button procedure event handler. The
> event handler then calls a procedure that will hopefully open the
> file, resize the image and display in the wdraw window. Right now
> I am getting an error saying that my wdraw variable is undefined.
> Some hints to what I am doing wrong, would be greatly appreciated!

Well, let's see. Where to begin? :-)

I guess your basic problem is that you created
an object graphics draw widget:

> wdraw = Widget_Draw(wbase_col, XSize=256, YSize=256,$
> Graphics_Level=2, Expose_Events=1, Retain=0, $
> Event_Func ='image_expose')

and I think you wanted to create a direct graphics draw
widget. You will want to leave out the Graphics_Level
keyword.

The value of a direct graphics draw widget is the
draw widget's window index number. The value of
an object graphics draw widget is a window object.

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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[Message index]

		Re: Widget_Draw - Help By: Liam E. Gumley on Fri, 19 October 2001 08:04
		Re: Widget_Draw - Help By: Logan Lindquist on Fri, 19 October 2001 07:31
		Re: Widget_Draw - Help By: Pavel A. Romashkin on Thu, 18 October 2001 22:46
		Re: Widget_Draw - Help By: Logan Lindquist on Thu, 18 October 2001 20:22
		Re: Widget_Draw - Help By: David Fanning on Thu, 18 October 2001 18:47
		Re: Widget_Draw - Help By: Logan Lindquist on Thu, 18 October 2001 18:06
		Re: Widget_Draw - Help By: David Fanning on Thu, 18 October 2001 14:14

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