/// <summary>
/// Create valid json string from object
/// </summary>
/// <param name="RawGeoJson"></param>
/// <returns>Valid json string, returns {} if empty</returns>
private string GeoJsonObjectToString(Data.DBGeojsonObject RawGeoJson)
{
if (RawGeoJson.RawGeoJson == null)
{
return("{}");
}
else
{
string JsonString = RawGeoJson.RawGeoJson.ToString();
if (JsonString == "")
{
return("{}");
}
else
{
return(JsonString);
}
}
}
/// <summary>
/// Create standard geojson feature list from Raw geojson features(not like database structured)
/// </summary>
/// <param name="RawGeoJson"></param>
/// <returns></returns>
public List <Feature> ToGISGeojsonFeatures(Data.DBGeojsonObject RawGeoJson, Data.Layer Layer)
{
List <Feature> features = new List <Feature>();
string JsonString = GeoJsonObjectToString(RawGeoJson);
var parsed = Newtonsoft.Json.Linq.JObject.Parse(JsonString);
JArray Val = (JArray)parsed["features"];
if (Val != null)
{
foreach (JToken jfeature in Val)
{
Feature geoFeature = new Feature();
geoFeature.friendlyname = Layer.LayerName;
geoFeature.guid = Layer.LayerGuId;
geoFeature.type = "Feature";
var featureGeometry = jfeature["geometry"];
var featureProperties = jfeature["properties"];
var geometryType = featureGeometry["type"];
var coordinates = featureGeometry["coordinates"];
//Properties geojsonProperties = (Properties)GetProperties(featureProperties);
geoFeature.properties = GetProperties(featureProperties);
geoFeature.properties.oID = RawGeoJson.oID;
if ((string)geometryType == "Point")
{
var lat = (decimal)coordinates.Values().ElementAt(0);
var lon = (decimal)coordinates.Values().ElementAt(1);
geoFeature.geometry = new PointGeometry("Point")
{
coordinates = new[] { lat, lon }
};
features.Add(geoFeature);
}
else if ((string)geometryType == "LineString")
{
int coordCount = coordinates.Count();
decimal[][] lineStringCoordinates = new decimal[coordCount][];
for (int i = 0; i < coordCount; i++)
{
var lat = (decimal)coordinates[i].Values().ElementAt(0);
var lon = (decimal)coordinates[i].Values().ElementAt(1);
lineStringCoordinates[i] = new decimal[] { lat, lon };
}
geoFeature.geometry = new LineStringGeometry("LineString")
{
coordinates = lineStringCoordinates
};
features.Add(geoFeature);
}
else if ((string)geometryType == "Polygon")
{
var polygonCoordinates = coordinates.First ?? "";
int coordCount = polygonCoordinates.Count();
decimal[][] polyFeatureCoordinates = new decimal[coordCount][];
for (int i = 0; i < coordCount; i++)
{
var lat = (decimal)polygonCoordinates[i].Values().ElementAt(0);
var lon = (decimal)polygonCoordinates[i].Values().ElementAt(1);
polyFeatureCoordinates[i] = new decimal[] { lat, lon };
}
// donut polygon capability is unimplemented
geoFeature.geometry = new PolygonGeometry("Polygon")
{
coordinates = new decimal[][][] { polyFeatureCoordinates }
};
features.Add(geoFeature);
}
else if ((string)geometryType == "MultiPolygon")
{
//var polygonCoordinates = coordinates.First ?? "";
//int polygonCount = polygonCoordinates.Count();
//for (int i = 0; i < polygonCount; i++)
//{
// var smallPolygon = polygonCoordinates[i].Values();
// int smallCount = smallPolygon.Count();
// decimal[][] polyFeatureCoordinates = new decimal[polygonCount][];
// for (int j = 0; j < smallCount; j++)
// {
// decimal lat = 0;
// decimal lon = 0;
// if (j % 2 == 0)
// {
// lat = (decimal)polygonCoordinates[i].Values().ElementAt(j);
// }
// else
// {
// lon = (decimal)polygonCoordinates[i].Values().ElementAt(j);
// }
// }
//}
}
else if ((string)geometryType == "MultiPoint")
{
}
else if ((string)geometryType == "MultiLineString")
{
}
}
}
return(features);
}
public string Get(string guid)
{
_logger.LogInformation("-> GeoJson request started: " + guid);
DataBase.DBQuery dBQuery = new DataBase.DBQuery(_appConfiguration);
List <Data.Layer> layers = new List <Data.Layer>();
// Zero if simple layer, otherwise it's a collection
List <string> lt = dBQuery.GetLayersInGroup(guid);
if (lt.Count == 0)
{
layers = dBQuery.GetLayers(new List <string>()
{
guid
});
}
else
{
var layersInGroup = dBQuery.GetLayersInGroup(guid);
layers = dBQuery.GetLayers(layersInGroup);
}
GIS.GJson gJson = new GIS.GJson();
gJson.type = "FeatureCollection";
gJson.processedlayers = new List <GIS.ProcessedLayer>();
gJson.guid = guid;
foreach (var layer in layers)
{
// array of names to create filter when create layer tree in GUI
// 19/03/19 --> guid instead
//gJson.layernames.Add(layer.LayerName);
//gJson.layerguids.Add(layer.LayerGuId);
// originally: with empty TABLENAME in MAP_LAYERS table, default SOURCE TABLE has been set
// 19/10/07 --> TABLENAME inMAP_LAYERS table is mandatory
// 19/12/13 friendlyname bekerült, aktív layer listához
//gJson.layerfriendlynames.Add(layer.LayerName);
// 20/01/15 --> processedlayer object to encapsulate geojson special properties
gJson.processedlayers.Add(new GIS.ProcessedLayer()
{
layerguid = layer.LayerGuId,
layerfriendlyname = layer.LayerName,
zoomlimit = layer.ZoomLimit
});
string tableName = _gisServices.SetDataTableName(layer);
if (layer.LayerType == "point")
{
List <Data.Point> points = new List <Data.Point>();
List <GIS.Feature> features = new List <GIS.Feature>();
// source table: default name, or defined in map_layers
if (string.IsNullOrEmpty(layer.Color))
{
points = dBQuery.GetSinglePointsDETAILED(tableName, layer.LayerGuId.ToString());
features = _gisServices.ToGISGeojsonFeatures(points, layer);
}
else
{
points = dBQuery.GetSinglePointsSIMPLIFIED(tableName, layer.LayerGuId.ToString());
features = _gisServices.ToGISGeojsonFeaturesSimplePoint(points, layer);
}
gJson.features.AddRange(features);
}
else if (layer.LayerType == "geojson")
{
List <GIS.Feature> features = new List <GIS.Feature>();
Data.DBGeojsonObject geojson = dBQuery.GetPlainGeojson("MAP_LAYER_GEOJSONS", layer.LayerGuId.ToString());
features = _gisServices.ToGISGeojsonFeatures(geojson, layer);
gJson.features.AddRange(features);
}
else if (layer.LayerType == "line")
{
List <Data.Line> lines = new List <Data.Line>();
List <GIS.Feature> features = new List <GIS.Feature>();
if (string.IsNullOrEmpty(layer.Color))
{
lines = dBQuery.GetSingleLinesDETAILED(tableName, layer.LayerGuId.ToString());
features = _gisServices.ToGISGeojsonFeatures(lines, layer);
}
else
{
lines = dBQuery.GetSingleLinesSIMPLIFIED(tableName, layer.LayerGuId.ToString());
features = _gisServices.ToGISGeojsonFeaturesSimpleLine(lines, layer);
}
gJson.features.AddRange(features);
}
}
return(JsonConvert.SerializeObject(gJson).ToString());// gJson.ToString();
}
