/// <summary>
/// Groups the rings into polygons.
/// </summary>
/// <param name="rings"></param>
/// <returns></returns>
private Geometry GroupRings(List<KeyValuePair<bool, LineairRing>> rings)
{
Geometry geometry = null;
bool[][] containsFlags = new bool[rings.Count][]; // means [x] contains [y]
for (int x = 0; x < rings.Count; x++)
{
containsFlags[x] = new bool[rings.Count];
for (int y = 0; y < x; y++)
{
containsFlags[x][y] =
rings[x].Value.Contains(rings[y].Value);
}
}
bool[] used = new bool[rings.Count];
MultiPolygon multiPolygon = null;
while (used.Contains(false))
{ // select a ring not contained by any other.
LineairRing outer = null;
int outerIdx = -1;
for (int idx = 0; idx < rings.Count; idx++)
{
if (!used[idx] && this.CheckUncontained(rings, containsFlags, used, idx))
{ // this ring is not contained in any other used rings.
if (!rings[idx].Key)
{
OsmSharp.Logging.Log.TraceEvent("OsmSharp.Osm.Interpreter.SimpleGeometryInterpreter", TraceEventType.Error,
"Invalid multipolygon relation: an 'inner' ring was detected without an 'outer'.");
}
outerIdx = idx;
outer = rings[idx].Value;
used[idx] = true;
break;
}
}
if (outer != null)
{ // an outer ring was found, find inner rings.
List<LineairRing> inners = new List<LineairRing>();
// select all rings contained by inner but not by any others.
for (int idx = 0; idx < rings.Count; idx++)
{
if (!used[idx] && containsFlags[outerIdx][idx] &&
this.CheckUncontained(rings, containsFlags, used, idx))
{
inners.Add(rings[idx].Value);
used[idx] = true;
}
}
bool unused = !used.Contains(false);
if (multiPolygon == null &&
inners.Count == 0 &&
unused)
{ // there is just one lineair ring.
geometry = outer;
break;
}
else if (multiPolygon == null &&
unused)
{ // there is just one polygon.
Polygon polygon = new Polygon(
outer, inners);
geometry = polygon;
break;
}
else
{ // there have to be other polygons.
{
multiPolygon = new MultiPolygon();
geometry = multiPolygon;
}
Polygon polygon = new Polygon(
outer, inners);
multiPolygon.Add(polygon);
}
}
else
{ // unused rings left but they cannot be designated as 'outer'.
OsmSharp.Logging.Log.TraceEvent("OsmSharp.Osm.Interpreter.SimpleGeometryInterpreter", TraceEventType.Error,
"Invalid multipolygon relation: Unassigned rings left.");
break;
}
}
return geometry;
}
/// <summary>
/// Translates a multipolygon.
/// </summary>
/// <param name="scene">The scene to add primitives to.</param>
/// <param name="projection">The projection used to convert the objects.</param>
/// <param name="multiPolygon"></param>
private void TranslateMultiPolygon(Scene2D scene, IProjection projection, MultiPolygon multiPolygon)
{
foreach(Polygon polygon in multiPolygon)
{
polygon.Attributes = multiPolygon.Attributes;
this.TranslatePolygon(scene, projection, polygon);
}
}
public void TestMultiPolygonSerialization()
{
var geometry1 = new Polygon(new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 1),
new GeoCoordinate(1, 1),
new GeoCoordinate(1, 0),
new GeoCoordinate(0, 0)
}));
var geometry2 = new Polygon(new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 2),
new GeoCoordinate(2, 2),
new GeoCoordinate(2, 0),
new GeoCoordinate(0, 0)
}));
var geometry3 = new Polygon(new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 3),
new GeoCoordinate(3, 3),
new GeoCoordinate(3, 0),
new GeoCoordinate(0, 0)
}));
var geometryCollection = new MultiPolygon(new Polygon[] { geometry1, geometry2, geometry3 });
var serialized = geometryCollection.ToGeoJson();
serialized = serialized.RemoveWhitespace();
Assert.AreEqual("{\"type\":\"MultiPolygon\",\"coordinates\":[[[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0],[0.0,0.0]]],[[[0.0,0.0],[2.0,0.0],[2.0,2.0],[0.0,2.0],[0.0,0.0]]],[[[0.0,0.0],[3.0,0.0],[3.0,3.0],[0.0,3.0],[0.0,0.0]]]]}",
serialized);
}
/// <summary>
/// Generates GeoJson for the given geometry collection.
/// </summary>
/// <param name="writer"></param>
/// <param name="geometryCollection"></param>
internal static void Write(JsonWriter writer, MultiPolygon geometryCollection)
{
if (writer == null) { throw new ArgumentNullException("writer"); }
if (geometryCollection == null) { throw new ArgumentNullException("geometryCollection"); }
writer.WriteStartObject();
writer.WritePropertyName("type");
writer.WriteValue("MultiPolygon");
writer.WritePropertyName("coordinates");
writer.WriteStartArray();
foreach (var geometry in geometryCollection)
{
writer.WriteStartArray();
writer.WriteStartArray();
foreach (var coordinate in geometry.Ring.Coordinates)
{
writer.WriteStartArray();
writer.WriteValue(coordinate.Longitude);
writer.WriteValue(coordinate.Latitude);
writer.WriteEndArray();
}
writer.WriteEndArray();
foreach (var hole in geometry.Holes)
{
writer.WriteStartArray();
foreach (var coordinate in hole.Coordinates)
{
writer.WriteStartArray();
writer.WriteValue(coordinate.Longitude);
writer.WriteValue(coordinate.Latitude);
writer.WriteEndArray();
}
writer.WriteEndArray();
}
writer.WriteEndArray();
}
writer.WriteEndArray();
writer.WriteEndObject();
}
public void TestGeometryCollectionSerialization()
{
var geometry1 = new LineString(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 1),
new GeoCoordinate(1, 1),
new GeoCoordinate(1, 0)
});
var geometry2 = new LineString(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 2),
new GeoCoordinate(2, 2),
new GeoCoordinate(2, 0)
});
var geometry3 = new LineString(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 3),
new GeoCoordinate(3, 3),
new GeoCoordinate(3, 0)
});
var geometry4 = new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 1),
new GeoCoordinate(1, 1),
new GeoCoordinate(1, 0),
new GeoCoordinate(0, 0)
});
var geometry5 = new Polygon(new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 1),
new GeoCoordinate(1, 1),
new GeoCoordinate(1, 0),
new GeoCoordinate(0, 0)
}));
var geometry6 = new MultiPolygon(geometry5, new Polygon(new LineairRing(
new GeoCoordinate[]
{
new GeoCoordinate(0, 0),
new GeoCoordinate(0, 2),
new GeoCoordinate(2, 2),
new GeoCoordinate(2, 0),
new GeoCoordinate(0, 0)
})));
var geometry7 = new Point(new GeoCoordinate(0, 1));
var geometry8 = new MultiPoint(geometry7, new Point(new GeoCoordinate(0, 2)));
var geometryCollection = new GeometryCollection(
geometry1, geometry2, geometry3,
geometry4, geometry5, geometry6,
geometry7, geometry8);
var serialized = geometryCollection.ToGeoJson();
serialized = serialized.RemoveWhitespace();
Assert.AreEqual("{\"type\":\"GeometryCollection\",\"geometries\":[{\"type\":\"LineString\",\"coordinates\":[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0]]},{\"type\":\"LineString\",\"coordinates\":[[0.0,0.0],[2.0,0.0],[2.0,2.0],[0.0,2.0]]},{\"type\":\"LineString\",\"coordinates\":[[0.0,0.0],[3.0,0.0],[3.0,3.0],[0.0,3.0]]},{\"type\":\"Polygon\",\"coordinates\":[[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0],[0.0,0.0]]]},{\"type\":\"Polygon\",\"coordinates\":[[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0],[0.0,0.0]]]},{\"type\":\"MultiPolygon\",\"coordinates\":[[[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0],[0.0,0.0]]],[[[0.0,0.0],[2.0,0.0],[2.0,2.0],[0.0,2.0],[0.0,0.0]]]]},{\"type\":\"Point\",\"coordinates\":[1.0,0.0]},{\"type\":\"MultiPoint\",\"coordinates\":[[1.0,0.0],[2.0,0.0]]}]}",
serialized);
}