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

[Burgholzer,Robert]

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

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
Internet: iis.fh-bingen.de 
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