From popovictamara91 at hotmail.com  Wed Jul 18 01:51:05 2018
From: popovictamara91 at hotmail.com (popovictamara)
Date: Wed, 18 Jul 2018 01:51:05 -0700 (MST)
Subject: [fdo-users] Set spatial context to MySQL DataStore
Message-ID: <1531903865137-0.post@n6.nabble.com>

Hello,
i have created MySQL Datastore, and I am trying to use IConnection object to
set spatial context and assign coordinate system to datastore, but i can't
get it to work. Not getting any exceptions, the code runs, but coordinate
system is not assigned. I write in C# and I am following FDO Developers
Guide example. 

*
Example No.1:*
 // Create spatial context, including coordinate system
 
  AcMapMap currentMap = AcMapMap.GetCurrentMap();
  string mapSRS = currentMap.GetMapSRS();
 
  ICreateSpatialContext createSCCmd = 
  conn.CreateCommand(CommandType.CommandType_CreateSpatialContext)
    as ICreateSpatialContext;
  createSCCmd.CoordinateSystemWkt = mapSRS;
  createSCCmd.Name = "";
  createSCCmd.CoordinateSystem = mapSRS;
  createSCCmd.Extent = new byte[] { 0, 0, 0, 0 };
  createSCCmd.Description = "Description";
  createSCCmd.XYTolerance = 0.0;
  createSCCmd.ZTolerance = 0.0;
  createSCCmd.Execute();


*Example No.2:*
DirectPositionImpl lowerLeft = new DirectPositionImpl();
lowerLeft.X = -180.0;
lowerLeft.Y = -90.0;
DirectPositionImpl upperRight = new DirectPositionImpl();
upperRight.X = 180.0;
upperRight.Y = 90.0;
FgfGeometryFactory geomFactory = new FgfGeometryFactory();
IEnvelope envelope = geomFactory.CreateEnvelope(lowerLeft, upperRight);
IGeometry geom = geomFactory.CreateGeometry(envelope);
byte[] extent = geomFactory.GetFgf(geom);
spatialContextWriter.CoordinateSystem = "WGS 84";
spatialContextWriter.CoordinateSystemWkt = "GEOGCS [ \"Longitude / Latitude
(WGS 84)\", DATUM [\"WGS 84\", SPHEROID [\"WGS 84\", 6378137,
298.257223563]], PRIMEM [ \"Greenwich\", 0.000000 ], UNIT \"Decimal
Degree\", 0.01745329251994330]]";
spatialContextWriter.Description = "This Coordinate System is used for
GPS.";
spatialContextWriter.ExtentType =
SpatialContextExtentType.SpatialContextExtentType_Static;
spatialContextWriter.Extent = extent;
spatialContextWriter.Name = "WGS84";
spatialContextWriter.XYTolerance = 0.001;




*And this is my code: *

FgfGeometryFactory geomFactory = new FgfGeometryFactory();

IniFile iniFile = new IniFile(Paths.Info);
string wkt = iniFile.Read("wkt", "WKT");
double xmin = double.Parse(iniFile.Read("xmin", "EXTENTS"));
double xmax = double.Parse(iniFile.Read("xmax", "EXTENTS"));
double ymin = double.Parse(iniFile.Read("ymin", "EXTENTS"));
double ymax = double.Parse(iniFile.Read("ymax", "EXTENTS"));

ICreateSpatialContext createSpatialContext =
conn.CreateCommand(CommandType.CommandType_CreateSpatialContext) as
ICreateSpatialContext;
createSpatialContext.Name = iniFile.Read("name", "SPATIALCONTEXT");
createSpatialContext.CoordinateSystem = wkt;
createSpatialContext.CoordinateSystemWkt = wkt;
createSpatialContext.Description = iniFile.Read("name", "SPATIALCONTEXT");
            
DirectPositionImpl lowerLeft = new DirectPositionImpl(xmax, ymin);
DirectPositionImpl upperRight = new DirectPositionImpl(xmin, ymax);
IEnvelope envelope = geomFactory.CreateEnvelope(lowerLeft, upperRight);
IGeometry geom = geomFactory.CreateGeometry(envelope);
byte[] extent = geomFactory.GetFgf(geom);
// a static extent is defined once and never changed
// a dynamic extent grows to accommodate the geometries added to the data
store
createSpatialContext.ExtentType =
SpatialContextExtentType.SpatialContextExtentType_Static;
createSpatialContext.Extent = extent;

createSpatialContext.XYTolerance = 0.00;
createSpatialContext.ZTolerance = 0.00;
createSpatialContext.Execute();


*this is wkt I use:*
PROJCS["MGI 1901 / Balkans zone 6",
    GEOGCS["MGI 1901",
        DATUM["MGI_1901",
            SPHEROID["Bessel 1841",6377397.155,299.1528128,
                AUTHORITY["EPSG","7004"]],
            TOWGS84[682,-203,480,0,0,0,0],
            AUTHORITY["EPSG","1031"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","3906"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",18],
    PARAMETER["scale_factor",0.9999],
    PARAMETER["false_easting",6500000],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","3908"]]



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