[OpenLayers-Dev] [OpenLayers-Users] OL-Based GeoEditor

[Dipl. Inf. Carsten Eider]

my problem is not the algorithm how to split the field,
it is more the way how to select one polygon, then select two corners

which control should i use?
a modified modifycontrol or can i reuse a selectcontrol?


Burgholzer,Robert schrieb:
>
> For step 1) The Openlayers example "./examples/select-feature.html" 
> shows how to select a vector feature.
>
> For step 2-3, ,f you are using postgis server side, there was a thread 
> recently on the PostGIS listserv that involved some code for splitting 
> a polygon with a line.  I think this might work for you.  Since you 
> already have the capability to draw new shapes you may wish to change 
> steps 2-3 to:
>
> 2) draw a line
>
>  
>
> and then simply use the function from PostGIS to split your selected 
> polygon.
>
>  
>
> The thread pertaining to this is here:
>
>  
>
> http://postgis.refractions.net/pipermail/postgis-users/2008-May/019892.html 
>
>
>  
>
>  
>
> Robert W. Burgholzer
>
> Surface Water Modeler
>
> Office of Water Supply and Planning
>
> Virginia Department of Environmental Quality
>
> rwburgholzer at deq.virginia.gov <mailto:rwburgholzer at deq.virginia.gov>
>
> 804-698-4405
>
> Open Source Modeling Tools:
>
> http://sourceforge.net/projects/npsource/
>
> -----Original Message-----
> *From:* dev-bounces at openlayers.org [mailto:dev-bounces at openlayers.org] 
> *On Behalf Of *Dipl. Inf. Carsten Eider
> *Sent:* Friday, June 13, 2008 4:25 AM
> *To:* users at openlayers.org; dev at openlayers.org
> *Subject:* [OpenLayers-Dev] OL-Based GeoEditor
>
>  
>
> Hi folks,
>
> i am working on a small geo-editor for an agricultural project in 
> rhine-palatinat/germany, visit http://www.agroconnect.de for more 
> information.
> Upto now my editor has the following features:
>
> ·         new polygon, plain OL
>
> ·         edit polgon, plain OL
>
> ·         delete polygon, plain OL
>
> ·         union polygon, OL with a javaserver in the backend
>
> Coming feaures:
>
> ·         split polygon into 2 elements, OL with server backend
>
> ·         group polygons
>
> At the moment i am hanging a bit with the split-feature.
> My idea is
>
> 1.      select polygon
>
> 2.      select first point/vertix as starting point
>
> 3.      select second point as ending point
>
> 4.      do split
>
> 5.      remove polygon and add the new ones
>
> Step 4 will be done on serverside,but could also be done on clientside.
>
> Any ideas how to realize steps 1-3. Should i use several controls 
> (Select and Modify) or
> should i subclass Control.ModifyFeature ?
>
> Any hints will be appreciated.
>
>
> -- 
> Mit freundlichen Grüßen / Yours faithfully
> Carsten Eider
>  
> Dipl. Inf. (FH)
>  
> Kompetenzzentrum für Innovative Informationssysteme
>  
> c/o Fachhochschhule Bingen / University of applied sciences Bingen
>  
> Berlinstraße 109
> 55411 Bingen
>  
> Tel: +49 (0) 6721 / 409-179
> Fax: +49 (0) 6721 / 409-158
> email: eider at fh-bingen.de <mailto:eider at fh-bingen.de>
> Internet: iis.fh-bingen.de 
> ------------------------------------------------------------------------
>
> _______________________________________________
> Users mailing list
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> http://openlayers.org/mailman/listinfo/users
>   

-- 
Mit freundlichen Grüßen / Yours faithfully
Carsten Eider

Dipl. Inf. (FH)

Kompetenzzentrum für Innovative Informationssysteme

c/o Fachhochschhule Bingen / University of applied sciences Bingen

Berlinstraße 109
55411 Bingen

Tel: +49 (0) 6721 / 409-179
Fax: +49 (0) 6721 / 409-158
email: eider at fh-bingen.de
Internet: iis.fh-bingen.de 

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