[OpenLayers-Users] Regarding calculating locations for a map

[Lasith Chandrasekara]

In case if you need my map file used to connect post gis with map server
here it is,

NAME "Sri Lanka Map"
SIZE 400 400
STATUS ON

EXTENT -437201.366774 78322.754457 326493.592543 541029.724757

UNITS METERS
SHAPEPATH "data/srilanka"

WEB
    TEMPLATE "in.xml"

    IMAGEPATH "/ms4w/Apache/htdocs/tmp/ms_tmp/" 
    IMAGEURL "/ms_tmp/"

    METADATA

	"wms_title"   "Sri Lanka WMS"
    	"wms_onlineresource"
"http://127.0.0.1/cgi-bin/mapserv.exe?MAP=/ms4w/Apache/htdocs/map/srilanka.map"
    	"wms_srs"   "EPSG:42304 EPSG:42101 EPSG:4269 EPSG:4326 EPSG:4015"
    	"wms_feature_info_mime_type" "text/html"
    	"wms_abstract" "Sri Lanka Map"

    	"wfs_title"   "Sri Lanka WFS"
    	"wfs_onlineresource"
"http://127.0.0.1/cgi-bin/mapserv.exe?MAP=/ms4w/Apache/htdocs/map/srilanka.map"
    	"wfs_srs"   "EPSG:42304 EPSG:42101 EPSG:4269 EPSG:4326 EPSG:4015"
    	"wfs_schemas_location" "http://geoservices.org"

    END

END

LAYER
 NAME roads
  TYPE LINE
  STATUS ON
  #DATA  road
  CONNECTIONTYPE postgis
  CONNECTION "user=postgres password=xxxx dbname=srilanka host=localhost"
  DATA "the_geom from road3"
  CLASS
    NAME "roads"
    STYLE
      COLOR 211 59 95
    END
  END
END # Layer roads





Lasith Chandrasekara wrote:
> 
> I am currently developing a shortest path application for my MSc degree
> project.
> Road information are stored in the postgis table and there I can find
> geometries for all the roads.
> 
> But I am having few issues when selecting from and to location from GUI
> (open layers). Where I have to provide a facility for users to select from
> and to locations on the map by clicking the mouse. If the user has done a
> drag, zoom in, zoom out operations on the map, then those changes to the
> map will reflect to those location cordinates as well.
> 
> Please suggest a way to resolve this issue by providing a simple example.
> Following is a part of data insertion and create of roads table sql.
> So you can provide more straight forward answer to me  I guess that we may
> have to deal with projections here (not sure).
> 
> ------------------------------------------------
> BEGIN;
> CREATE TABLE "database"."roadstable" (gid serial PRIMARY KEY,
> "fnode_" int8,
> "tnode_" int8,
> "lpoly_" int8,
> "rpoly_" int8,
> "length" float8,
> "road_" int8,
> "road_id" int8,
> "code" int2,
> "class" varchar(4));
> SELECT
> AddGeometryColumn('database','roadstable','the_geom','-1','MULTILINESTRING',2);
> INSERT INTO "database"."roadstable"
> ("fnode_","tnode_","lpoly_","rpoly_","length","road_","road_id","code","class",the_geom)
> VALUES
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
> 
> 
> 

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