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Re: IDLgrPolygon borders [message #35531]

Tue, 24 June 2003 10:27

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"Mark Hadfield" wrote in message...
> "David Fanning" wrote in message...
>> M. Katz writes:
>>
>>> With IDLgrPolygon objects, is it possible to have different colors
>>> for the fill and the border line? I'd like to avoid using two
>>> different objects. I'm drawing black borders around solid-colored
>>> regions.
>>
>> I think you are going to have to use IDLgrPolygon with IDLgrPolyline
>> to get what you want, probably with some sort of offset to get the
>> lines on top of the polygons. (Perhaps the offset won't be
>> necessary if you can wait for IDL 6.0 to come out. :-)
>
> The DEPTH_OFFSET keyword, introduced in version 5.5, addresses the
> "getting lines on top of filled objects" issue. Here is an excerpt
> from the documentation for IDLgrPolygon::Init:

6.0 doesn't magically eliminate stitching so I wouldn't hold your breath.
DEPTH_OFFSET or applying an appropriate transform (scale or translation) to
your border object are your two options.

If you simply want a border, take David's approach. If you want polygon
edging, use another polygon object. Use the SHARE_DATA keyword on your
edging (border) object so you don't duplicate vertex data (you will still
need to provide polygon connectivity data though).

-Rick

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[Message index]

		Re: IDLgrPolygon borders By: Rick Towler on Tue, 24 June 2003 10:27
		Re: IDLgrPolygon borders By: David Fanning on Tue, 24 June 2003 07:13
		Re: IDLgrPolygon borders By: alt on Tue, 24 June 2003 00:39
		Re: IDLgrPolygon borders By: Mark Hadfield on Mon, 23 June 2003 17:32
		Re: IDLgrPolygon borders By: David Fanning on Mon, 23 June 2003 16:04

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