Hmmm...  That sounds like the simplest UI and coding, alright.  And I 
guess it's safe enough - the conditions for this to become active are 
restrictive enough that users shouldn't be extending linestrings when 
they don't want to.

Yay - no new tool required!

Larry Becker wrote:
>
>     Extending linestrings from one end would be highly appreciated
>     feature.
>
>
> Do you think it would be sufficient to add some code to the existing 
> linestring tool?  It could check to see if 1) a linestring was 
> selected , and 2) one of its endpoints match an endpoint of of the 
> linestring just digitized.  If true, it would merge the two 
> linestrings.  This behavior is similar to the polygon tool when 
> creating holes.
>
> Larry
>
> On Wed, Oct 22, 2008 at 4:19 PM, Rahkonen Jukka 
> <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:
>
>     Hi,
>
>     Has anyone dealed with data created by using stream digitizing
>     tool?  For us it took quite a long time to get rid of the
>     unnecessary vertices some digitizers created with such a weapon
>     they found from MicroStation.  I suggest a) to hide it from
>     beginners or b) to integrate simplifying algorithm with the tool.
>      I mean some logic like "when in stream mode, don't insert points
>     with less than x meters intervals if they stay inside y meters
>     wide tolerance tube".
>
>     Extending linestrings from one end would be highly appreciated
>     feature.
>
>     -Jukka Rahkonen-
>
>
>     -----Alkuperäinen viesti-----
>     Lähettäjä: Martin Davis [mailto:[EMAIL PROTECTED]
>     <mailto:[EMAIL PROTECTED]>]
>     Lähetetty: to 23.10.2008 0:01
>     Vastaanottaja: OpenJUMP Dev
>     Aihe: [JPP-Devel] Stream digitizing tools?
>
>     Has anyone created tools for doing stream digitizing?  E.g. generating
>     points (at some rate or distance interval) along a linestring as
>     long as
>     the mouse is held down?
>
>     Also, it seems to me like it would be nice to have a tool which
>     allowed
>     you to extend a previously created linestring from one end (in
>     either a
>     click or stream fashion).  Anything like that out there?
>
>     And finally... has anyone thought about adding a Google-Maps style
>     vertex insertion tool?
>
>     --
>     Martin Davis
>     Senior Technical Architect
>     Refractions Research, Inc.
>     (250) 383-3022
>
>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022


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