| Re: OnExpose in ActiveX [message #26033 is a reply to message #26032] |
Wed, 01 August 2001 06:39  |
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david[2]
Messages: 100
Registered: June 2001
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Senior Member |
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Bert Bierman writes:
> I ran into a problem which I hope someone can give me a hint:
>
> I use the IDLDrawWidget with Visual Basic.
> In the IDL-procedure I create a surface with SurfaceShade and PolyShade,
> and display this in the IDLDrawWidget.
>
> Because I want to manipulate the image I played around with the
> RegisterForEvents to set who is handling the mouse-events
> (VB or IDL).
>
> If you set "forward expose events" the image is no longer
> displayed?? But the button-processing is perfect.
> I guess the expose-event does not reach the IDL and the image
> is not actually displayed. I looked for an expose-function to
> trgger from VB like the ...->draw.... in object graphics but could
> not find it.
>
> Does someone know how this can be done?
I would guess you haven't turned EXPOSE events
on for the draw widget, therefore they are not
being generated:
drawid = Widget_Draw(baseID, ...., Expose_Events=1)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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