/// <summary>
/// Find the centroid of the geometry
/// </summary>
/// <param name="geometryId"></param>
/// <returns>A point object representing the centroid</returns>
public static Mapsui.Geometries.Point GetCentreOfGeometry(int geometryId)
{
var items = DataDAO.getDataForMap(App.CurrentProjectId);
foreach (var item in items)
{
if (item.geomId == geometryId)
{
var coords = item.shapeGeom.Centroid;
var centre = SphericalMercator.FromLonLat(coords.X, coords.Y);
return(centre);
}
}
return(null);
}
public static Dictionary <string, ILayer> CreateShapes()
{
var layerDic = new Dictionary <string, ILayer>();
var items = DataDAO.getDataForMap(App.CurrentProjectId);
if (items != null && items.Count > 0)
{
var points = new List <Feature>();
var polygons = new List <Feature>();
var lines = new List <Feature>();
var allShapes = new List <Feature>();
foreach (Shape item in items)
{
var coords = item.shapeGeom.Coordinates;
var coordCount = item.shapeGeom.Coordinates.Length;
if (coordCount > 0)
{
if (coordCount == 1)
{
//Point
var coord = coords[0];
var point = SphericalMercator.FromLonLat(coord.X, coord.Y);
var feature = new Feature
{
Geometry = point,
["Name"] = item.geomId.ToString(),
["Label"] = item.title
};
feature.Styles.Add(new LabelStyle
{
Text = item.title,
BackColor = new Mapsui.Styles.Brush(Mapsui.Styles.Color.White),
HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Left,
Offset = new Offset(20, 0, false)
});
points.Add(feature);
allShapes.Add(feature);
}
else
{
var coord0 = coords[0];
var coordx = coords[coordCount - 1];
if (coord0.X == coordx.X && coord0.Y == coordx.Y)
{
//Polygon
var polygon = new Polygon();
var localCoords = coords;
foreach (NetTopologySuite.Geometries.Coordinate coord in localCoords)
{
var pt = SphericalMercator.FromLonLat(coord.X, coord.Y);
polygon.ExteriorRing.Vertices.Add(new Mapsui.Geometries.Point(pt.X, pt.Y));
}
var feature = new Feature {
Geometry = polygon,
["Name"] = item.geomId.ToString(),
["Label"] = item.title
};
feature.Styles.Add(new LabelStyle
{
Text = item.title,
BackColor = new Mapsui.Styles.Brush(Mapsui.Styles.Color.White),
HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center
});
polygons.Add(feature);
allShapes.Add(feature);
}
else
{
//Line
var line = new LineString();
var localCoords = coords;
foreach (NetTopologySuite.Geometries.Coordinate coord in localCoords)
{
var pt = SphericalMercator.FromLonLat(coord.X, coord.Y);
line.Vertices.Add(new Mapsui.Geometries.Point(pt.X, pt.Y));
}
var feature = new Feature
{
Geometry = line,
["Name"] = item.geomId.ToString(),
["Label"] = item.title
};
feature.Styles.Add(new LabelStyle
{
Text = item.title,
BackColor = new Mapsui.Styles.Brush(Mapsui.Styles.Color.White),
HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center
});
lines.Add(feature);
allShapes.Add(feature);
}
}
}
}
ILayer polygonLayer = CreatePolygonLayer(polygons, new Mapsui.Styles.Color(0, 0, 200, 255), new Mapsui.Styles.Color(0, 0, 200, 32));
ILayer pointLayer = CreatePointLayer(points);
ILayer lineLayer = CreateLineLayer(lines, new Mapsui.Styles.Color(0, 0, 200, 255));
ILayer allShapesLayer = CreatePolygonLayer(allShapes, new Mapsui.Styles.Color(0, 0, 200, 255), new Mapsui.Styles.Color(0, 0, 200, 32)); //AllShapes layer is created merely to get bounding box of all shapes. It does not have the correct styles for showing all the shapes
layerDic.Add("polygons", polygonLayer);
layerDic.Add("lines", lineLayer);
layerDic.Add("points", pointLayer);
layerDic.Add("all", allShapesLayer);
}
return(layerDic);
}