public static List <List <Coordinate> > ParseGeometry(List <uint> geom, Tile.GeomType geomType)
{
int x = 0;
int y = 0;
var coordsList = new List <List <Coordinate> >();
List <Coordinate> coords = null;
var geometryCount = geom.Count;
uint length = 0;
uint command = 0;
var i = 0;
while (i < geometryCount)
{
if (length <= 0)
{
length = geom[i++];
command = length & ((1 << 3) - 1);
length = length >> 3;
}
if (length > 0)
{
if (command == (uint)CommandId.MoveTo)
{
coords = new List <Coordinate>();
coordsList.Add(coords);
}
}
if (command == (uint)CommandId.ClosePath)
{
if (geomType != Tile.GeomType.Point && !(coords.Count == 0))
{
coords.Add(coords[0]);
}
length--;
continue;
}
var dx = geom[i++];
var dy = geom[i++];
length--;
var ldx = ZigZag.Decode((int)dx);
var ldy = ZigZag.Decode((int)dy);
x = x + ldx;
y = y + ldy;
var coord = new Coordinate()
{
X = x, Y = y
};
coords.Add(coord);
}
return(coordsList);
}
private Geometry ReadGeometry(TileGeometryTransform tgs, Tile.GeomType type, IList <uint> geometry)
{
switch (type)
{
case Tile.GeomType.Point:
return(ReadPoint(tgs, geometry));
case Tile.GeomType.LineString:
return(ReadLineString(tgs, geometry));
case Tile.GeomType.Polygon:
return(ReadPolygon(tgs, geometry));
}
return(null);
}
public static void EncodeGeometry(List <List <Coordinate> > coordList, Tile.GeomType geomType, List <System.UInt32> geometry)
{
switch (geomType)
{
case Tile.GeomType.Point:
EncodePointGeometry(coordList, geometry);
break;
case Tile.GeomType.LineString:
EncodeLineGeometry(coordList, geometry);
break;
case Tile.GeomType.Polygon:
EncodePolygonGeometry(coordList, geometry);
break;
default:
throw new System.Exception(string.Format("Unknown geometry type:{0}", geomType));
}
}
/// <summary>
/// Convert Mapbox tile format (see https://www.mapbox.com/vector-tiles/specification/)
/// </summary>
/// <param name="geom">Geometry information in Mapbox format</param>
/// <param name="geomType">GeometryType of this geometry</param>
/// <param name="offsetX">World coordinates of left top edge of tile</param>
/// <param name="offsetY">World coordinates of left top edge of tile</param>
/// <param name="factor">Factor for converting Mapbox coordinates to world coordinates</param>
/// <returns>List of list of points in world coordinates</returns>
public static List <List <Point> > ParseGeometry(List <uint> geom, Tile.GeomType geomType, double offsetX, double offsetY, double factor)
{
const uint cmdMoveTo = 1;
//const uint cmdLineTo = 2;
const uint cmdSegEnd = 7;
//const uint cmdBits = 3;
long x = 0;
long y = 0;
var coordsList = new List <List <Point> >();
List <Point> coords = null;
var geometryCount = geom.Count;
uint length = 0;
uint command = 0;
var i = 0;
while (i < geometryCount)
{
if (length <= 0)
{
length = geom[i++];
command = length & ((1 << 3) - 1);
length = length >> 3;
}
if (length > 0)
{
if (command == cmdMoveTo)
{
coords = new List <Point>();
coordsList.Add(coords);
}
}
if (command == cmdSegEnd)
{
if (geomType != Tile.GeomType.Point && coords?.Count != 0)
{
coords?.Add(coords[0]);
}
length--;
continue;
}
var dx = geom[i++];
var dy = geom[i++];
length--;
var ldx = ZigZag.Decode(dx);
var ldy = ZigZag.Decode(dy);
x = x + ldx;
y = y + ldy;
// Calc coordinates in EPSG:3857 format
var coord = new Point(offsetX + x * factor, offsetY - y * factor);
coords?.Add(coord);
}
return(coordsList);
}
public static List <List <Coordinate> > ParseGeometry(List <uint> geom, Tile.GeomType geomType)
{
const uint cmdMoveTo = 1;
//const uint cmdLineTo = 2;
const uint cmdSegEnd = 7;
//const uint cmdBits = 3;
long x = 0;
long y = 0;
var coordsList = new List <List <Coordinate> >();
List <Coordinate> coords = null;
var geometryCount = geom.Count;
uint length = 0;
uint command = 0;
var i = 0;
while (i < geometryCount)
{
if (length <= 0)
{
length = geom[i++];
command = length & ((1 << 3) - 1);
length = length >> 3;
}
if (length > 0)
{
if (command == cmdMoveTo)
{
coords = new List <Coordinate>();
coordsList.Add(coords);
}
}
if (command == cmdSegEnd)
{
if (geomType != Tile.GeomType.Point && !(coords.Count == 0))
{
coords.Add(coords[0]);
}
length--;
continue;
}
var dx = geom[i++];
var dy = geom[i++];
length--;
var ldx = ZigZag.Decode(dx);
var ldy = ZigZag.Decode(dy);
x = x + ldx;
y = y + ldy;
// use scale? var coord = new Coordinate(x / scale, y / scale);
var coord = new Coordinate()
{
X = x, Y = y
};
coords.Add(coord);
}
return(coordsList);
}
