PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Bill Huber
Sent: January 22, 2002 11:18
To: [EMAIL PROTECTED]
Subject: RE: MI-L MB: polygon drawing direction.
At 11:24 PM 1/21/02 +0100, Eric wrote:
>The most common way is done thru dot products or (quite identical) signed
>area :
That
3' 60N 4? 58' 60E Alt: 0
> -Message d'origine-
> De : [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]De la part de Bill Huber
> Envoye : mardi 22 janvier 2002 17:18
> A : [EMAIL PROTECTED]
> Objet : RE: MI-L MB: polygon drawing direction.
>
>
> At 11:
At 11:24 PM 1/21/02 +0100, Eric wrote:
>The most common way is done thru dot products or (quite identical) signed
>area :
That's a great technique, but it's a lot of work to process large polygons
because you have to do the arithmetic at every vertex. It strikes me that
a task as conceptually
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-Original Message-
From: Patrick Palmier [mailto:[EMAIL PROTECTED]]
Sent: dinsdag 22 januari 2002 11:51
To: Jacques Paris
Cc: MapInfo-L
Subject: Re: MI-L MB: polygon drawing direction.
You probably know this issue.
Directly in Mapinfo, you could do a
You probably know this issue.
Directly in Mapinfo, you could do a simple thing
set your layer editable on
Select your polygon
Convert to polyline temporarely
in the layer control check the show the line direction
an arrow will show you if the polygon is clockwise or anticlockwise
Patrick Palmier
Hello Jacques,
Here's my stock function. You pass in the object and the polygon number.
Regards,
Warren Vick
Europa Technologies Ltd.
http://www.europa-tech.com
function IsClockwise(byval TestObj as object, byval Part as smallint) as
logical
dim NrPnts, i as integer
dim a, x, y, Old_x, O
Hi Jacques,
The most common way is done thru dot products or (quite identical) signed
area :
Here's an mb snippet that should do the job (not for 'beignes' though ;) )
'''
' Function CheckCCW (NNodes as integer) as logical
'
