/// <summary>
/// Collect edges from area inputs which should be in the result but
/// which have not been included in a result area.
/// </summary>
/// <remarks>
/// This happens ONLY:
/// <list type="bullet">
/// <item>
/// <description>
/// During an intersection when the boundaries of two areas touch
/// in a line segment.
/// </description>
/// </item>
/// <item>
/// <description>OR as a result of a dimensional collapse.</description>
/// </item>
/// </list>
/// </remarks>
private void CollectBoundaryTouchEdge(DirectedEdge de,
OverlayType opCode, ArrayList edges)
{
Label label = de.Label;
if (de.LineEdge)
{
return; // only interested in area edges
}
if (de.Visited)
{
return; // already processed
}
if (de.InteriorAreaEdge)
{
return; // added to handle dimensional collapses
}
if (de.Edge.InResult)
{
return; // if the edge linework is already included, don't include it again
}
// sanity check for labelling of result edgerings
Debug.Assert(!(de.InResult || de.Sym.InResult) || !de.Edge.InResult);
// include the linework if it's in the result of the operation
if (OverlayOp.IsResultOfOp(label, opCode) &&
opCode == OverlayType.Intersection)
{
edges.Add(de.Edge);
de.VisitedEdge = true;
}
}
/// <summary>
///
/// </summary>
/// <param name="opCode"></param>
/// <returns></returns>
public IGeometry GetResultGeometry(SpatialFunction opCode)
{
IGeometry[] prepGeom = Snap();
IGeometry result = OverlayOp.Overlay(prepGeom[0], prepGeom[1], opCode);
return(PrepareResult(result));
}
/// <summary>
/// Determines nodes which are in the result, and creates
/// {@link Point}s for them.
///
/// This method determines nodes which are candidates for the result via their
/// labelling and their graph topology.
///
/// </summary>
/// <param name="opCode">the overlay operation
/// </param>
private void ExtractNonCoveredResultNodes(OverlayType opCode)
{
// Add nodes from edge intersections which have not already been included in the result
for (IEnumerator nodeit = op.Graph.Nodes.GetEnumerator(); nodeit.MoveNext();)
{
Node n = (Node)nodeit.Current;
// filter out nodes which are known to be in the result
if (n.InResult)
{
continue;
}
// if an incident edge is in the result, then the node coordinate is included already
if (n.IsIncidentEdgeInResult)
{
continue;
}
if (n.Edges.Degree == 0 ||
opCode == OverlayType.Intersection)
{
// For nodes on edges, only INTERSECTION can result in
// edge nodes being included even
// if none of their incident edges are included
Label label = n.Label;
if (OverlayOp.IsResultOfOp(label, opCode))
{
FilterCoveredNodeToPoint(n);
}
}
}
}
/// <summary>
/// Computes a <c>Geometry</c> representing the point-set which is
/// common to both <c>a</c> and <c>b</c> Geometry.
/// </summary>
/// <param name="a">The 1st <c>Geometry</c></param>
/// <param name="b">The 2nd <c>Geometry</c></param>
/// <returns>A geometry representing the point-set common to the two <c>Geometry</c>s.</returns>
/// <seealso cref="Geometry.Intersection"/>
public virtual Geometry Intersection(Geometry a, Geometry b)
{
/**
* TODO: MD - add optimization for P-A case using Point-In-Polygon
*/
// special case: if one input is empty ==> empty
if (a.IsEmpty || b.IsEmpty)
{
return(OverlayOp.CreateEmptyResult(SpatialFunction.Intersection, a, b, a.Factory));
}
// compute for GCs
// (An inefficient algorithm, but will work)
// TODO: improve efficiency of computation for GCs
if (a.OgcGeometryType == OgcGeometryType.GeometryCollection)
{
var g2 = b;
return(GeometryCollectionMapper.Map(
(GeometryCollection)a, g => g.Intersection(g2)));
}
// No longer needed since GCs are handled by previous code
//CheckNotGeometryCollection(a, b);
return(Overlay(a, b, SpatialFunction.Intersection));
}
/// <summary>
/// Computes a <c>Geometry</c> representing the point-set
/// which is contained in both input <c>Geometry</c>s .
/// </summary>
/// <param name="a">The 1st <c>Geometry</c></param>
/// <param name="b">The 2nd <c>Geometry</c></param>
/// <returns>A point-set combining the points of
/// <c>Geometry</c>'s <c>a</c> and <c>b</c>.
/// </returns>
/// <seealso cref="Geometry.Union(Geometry)"/>
public virtual Geometry Union(Geometry a, Geometry b)
{
// handle empty geometry cases
if (a.IsEmpty || (b == null || b.IsEmpty))
{
// both empty - check dimensions
if (a.IsEmpty && (b == null || b.IsEmpty))
{
return(OverlayOp.CreateEmptyResult(SpatialFunction.Union, a, b, a.Factory));
}
// special case: if either input is empty ==> result = other arg
if (a.IsEmpty)
{
return(b.Copy());
}
if (b == null || b.IsEmpty)
{
return(a.Copy());
}
}
// TODO: optimize if envelopes of geometries do not intersect
CheckNotGeometryCollection(a, b);
return(Overlay(a, b, SpatialFunction.Union));
}
/// <summary>
/// Computes a <c>Geometry</c> representing the closure of the point-set
/// which is the union of the points in <c>Geometry</c> <c>a</c> which are not
/// contained in the Geometry <c>b</c>,
/// with the points in the <c>b</c> Geometry not contained in the <c>Geometry</c> <c>a</c>.
/// </summary>
/// <param name="a">The 1st <c>Geometry</c></param>
/// <param name="b">The 2nd <c>Geometry</c></param>
/// <returns>
/// A Geometry representing the point-set symmetric difference
/// of <c>Geometry</c>'s <c>a</c> and <c>b</c>.
/// </returns>
/// <seealso cref="Geometry.SymmetricDifference(Geometry)"/>
public virtual Geometry SymmetricDifference(Geometry a, Geometry b)
{
// handle empty geometry cases
if (a.IsEmpty || (b == null || b.IsEmpty))
{
// both empty - check dimensions
if (a.IsEmpty && (b == null || b.IsEmpty))
{
return(OverlayOp.CreateEmptyResult(SpatialFunction.SymDifference, a, b, a.Factory));
}
// special case: if either input is empty ==> result = other arg
if (a.IsEmpty)
{
return(b.Copy());
}
if (b == null || b.IsEmpty)
{
return(a.Copy());
}
}
CheckNotGeometryCollection(a, b);
return(Overlay(a, b, SpatialFunction.SymDifference));
}
public IGeometry GetResultGeometry(SpatialFunction opCode)
{
IGeometry result = null;
var isSuccess = false;
try
{
result = OverlayOp.Overlay(geom[0], geom[1], opCode);
var isValid = true;
// not needed if noding validation is used
// boolean isValid = OverlayResultValidator.isValid(geom[0], geom[1], OverlayOp.INTERSECTION, result);
// if (isValid)
isSuccess = true;
}
catch (Exception ex)
{
// Ignore this exception, since the operation will be rerun
Debug.WriteLine(ex);
}
if (!isSuccess)
{
// This may still throw an exception - just let it go if it does
result = SnapOverlayOp.Overlay(geom[0], geom[1], opCode);
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="opCode"></param>
/// <returns></returns>
public Geometry GetResultGeometry(SpatialFunction opCode)
{
var prepGeom = Snap(_geom);
var result = OverlayOp.Overlay(prepGeom[0], prepGeom[1], opCode);
return(PrepareResult(result));
}
///<summary>
/// Returns a set combining the points in this Geometry not in other, and the points in other not
/// in this Geometry.
///</summary>
///<remarks>This method returns the closure of the resultant Geometry.</remarks>
///<param name="geometry"> the Geometry with which to compute the symmetric difference.</param>
///<returns>Returns the point set symmetric difference of this Geometry with other geometry.</returns>
public virtual Geometry SymDifference(Geometry geometry)
{
CheckNotGeometryCollection(this);
CheckNotGeometryCollection(geometry);
CheckEqualSRID(geometry);
CheckEqualPrecisionModel(geometry);
return OverlayOp.Overlay(this, geometry, OverlayOp.SymDifference);
}
///<summary>
/// Returns a Geometry representing all the points in this Geometry and other.
///</summary>
///<param name="geometry"> the Geometry with which to compute the union </param>
///<returns>Returns a set combining the points of this Geometry and the points of other geometry.</returns>
public virtual Geometry Union(Geometry geometry)
{
CheckNotGeometryCollection(this);
CheckNotGeometryCollection(geometry);
CheckEqualSRID(geometry);
CheckEqualPrecisionModel(geometry);
return OverlayOp.Overlay(this, geometry, OverlayOp.Union);
}
public LineBuilder(OverlayOp op, GeometryFactory geometryFactory,
PointLocator ptLocator)
{
lineEdgesList = new ArrayList();
resultLineList = new GeometryList();
this.op = op;
this.geometryFactory = geometryFactory;
this.ptLocator = ptLocator;
}
private Exception TryOverlay(Geometry g1, Geometry g2)
{
Exception ex = null;
try
{
OverlayOp.Overlay(g1, g2, SpatialFunction.Intersection);
}
catch (Exception e)
{
ex = e;
}
return(ex);
}
private static bool IsValidResult(SpatialFunction overlayOp, Location[] location)
{
bool expectedInterior = OverlayOp.IsResultOfOp(location[0], location[1], overlayOp);
bool resultInInterior = (location[2] == Location.Interior);
// MD use simpler: boolean isValid = (expectedInterior == resultInInterior);
bool isValid = !(expectedInterior ^ resultInInterior);
if (!isValid)
{
ReportResult(overlayOp, location, expectedInterior);
}
return(isValid);
}
/// <summary>
/// Collect line edges which are in the result.
/// Line edges are in the result if they are not part of
/// an area boundary, if they are in the result of the overlay operation,
/// and if they are not covered by a result area.
/// </summary>
/// <param name="de">the directed edge to test</param>
/// <param name="opCode">the overlap operation</param>
/// <param name="edges">the list of included line edges</param>
private void CollectLineEdge(DirectedEdge de, OverlayType opCode, ArrayList edges)
{
Label label = de.Label;
Edge e = de.Edge;
// include L edges which are in the result
if (de.LineEdge)
{
if (!de.Visited && OverlayOp.IsResultOfOp(label, opCode) && !e.Covered)
{
edges.Add(e);
de.VisitedEdge = true;
}
}
}
/// <summary>
/// Cuts the given linestring in one of more segments.
/// </summary>
/// <param name="tilePolygon">The tile polygon.</param>
/// <param name="lineString">The linestring.</param>
/// <returns>One or more segments.</returns>
public static IEnumerable <LineString> Cut(this Polygon tilePolygon, LineString lineString)
{
var op = new OverlayOp(lineString, tilePolygon);
var intersection = op.GetResultGeometry(SpatialFunction.Intersection);
if (intersection.IsEmpty)
{
yield break;
}
switch (intersection)
{
case LineString ls:
// intersection is a linestring.
yield return(ls);
yield break;
case GeometryCollection gc:
{
foreach (var geometry in gc.Geometries)
{
switch (geometry)
{
case LineString ls0:
yield return(ls0);
break;
case Point _:
// The linestring only has a single point in this tile
// We skip it
// TODO check if this is correct
continue;
default:
throw new Exception(
$"{nameof(LineStringTiler)}.{nameof(Cut)} failed: A geometry was found in the intersection that wasn't a {nameof(LineString)}.");
}
}
yield break;
}
default:
throw new Exception($"{nameof(LineStringTiler)}.{nameof(Cut)} failed: Unknown result.");
}
}
/// <summary>
/// Computes a <c>Geometry</c> representing the closure of the point-set
/// of the points contained in this <c>Geometry</c> that are not contained in
/// the <c>other</c> Geometry.
/// </summary>
/// <param name="a">The 1st <c>Geometry</c></param>
/// <param name="b">The 2nd <c>Geometry</c></param>
/// <returns>
/// A Geometry representing the point-set difference
/// of <c>Geometry</c>'s <c>a</c> and <c>b</c>.
/// </returns>
/// <seealso cref="Geometry.Difference(Geometry)"/>
public virtual Geometry Difference(Geometry a, Geometry b)
{
// special case: if A.isEmpty ==> empty; if B.isEmpty ==> A
if (a.IsEmpty)
{
return(OverlayOp.CreateEmptyResult(SpatialFunction.Difference, a, b, a.Factory));
}
if (b == null || b.IsEmpty)
{
return(a.Copy());
}
CheckNotGeometryCollection(a, b);
return(Overlay(a, b, SpatialFunction.Difference));
}
public IGeometry GetResultGeometry(SpatialFunction opCode)
{
IGeometry result = null;
var isSuccess = false;
Exception savedException = null;
try
{
// try basic operation with input geometries
result = OverlayOp.Overlay(_geom[0], _geom[1], opCode);
var isValid = true;
// not needed if noding validation is used
// boolean isValid = OverlayResultValidator.isValid(geom[0], geom[1], OverlayOp.INTERSECTION, result);
// if (isValid)
isSuccess = true;
}
catch (Exception ex)
{
savedException = ex;
//// Ignore this exception, since the operation will be rerun
//Debug.WriteLine(ex);
//Console.WriteLine(ex.Message));
//Console.WriteLine("Geom 0: " + geom[0]);
//Console.WriteLine("Geom 1: " + geom[1]);
}
if (!isSuccess)
{
// this may still throw an exception
// if so, throw the original exception since it has the input coordinates
try
{
result = SnapOverlayOp.Overlay(_geom[0], _geom[1], opCode);
}
catch (Exception)
{
throw savedException;
}
}
return(result);
}
public Geometry GetResultGeometry(SpatialFunction opCode)
{
Geometry result = null;
bool isSuccess = false;
ExceptionDispatchInfo savedException = null;
try
{
// try basic operation with input geometries
result = OverlayOp.Overlay(_geom[0], _geom[1], opCode);
bool isValid = true;
// not needed if noding validation is used
// boolean isValid = OverlayResultValidator.isValid(geom[0], geom[1], OverlayOp.INTERSECTION, result);
// if (isValid)
isSuccess = true;
}
catch (Exception ex)
{
savedException = ExceptionDispatchInfo.Capture(ex);
// Ignore this exception, since the operation will be rerun
}
if (!isSuccess)
{
// this may still throw an exception
// if so, throw the original exception since it has the input coordinates
try
{
result = SnapOverlayOp.Overlay(_geom[0], _geom[1], opCode);
}
catch (Exception)
{
savedException.Throw();
}
}
return(result);
}
public PointBuilder(OverlayOp op, GeometryFactory geometryFactory)
{
this.op = op;
this.geometryFactory = geometryFactory;
this.resultPointList = new GeometryList();
}
/// <summary>
/// Computes a unary union with no extra optimization, and no short-circuiting.
/// </summary>
/// <remarks>
/// Due to the way the overlay operations are implemented, this is still efficient in the case of linear and puntal geometries.
/// </remarks>
/// <param name="g0">A geometry</param>
/// <returns>The union of the input geometry</returns>
private IGeometry UnionNoOpt(IGeometry g0)
{
var empty = _geomFact.CreatePoint();
return(OverlayOp.Overlay(g0, empty, SpatialFunction.Union));
}
static void Main(string[] args)
{
BasicConfigurator.Configure();
string geoJSONdatafile = @"D:\research\wifidata\network_minspan_001.geojson";
var networksInRange = new HashSet <string>(new string[] {
"bc:ae:c5:c3:71:66",
"00:20:a6:5d:5f:7c",
"00:22:3f:7a:76:39"
});
var json = File.ReadAllText(geoJSONdatafile);
var coll = (JObject)JsonConvert.DeserializeObject(json);
List <JObject> found = new List <JObject>();
List <Polygon> polygons = new List <Polygon>();
foreach (JObject feature in coll["features"])
{
JObject atts = (JObject)feature["properties"];
var bssid = (string)atts["bssid"];
if (networksInRange.Contains(bssid))
{
found.Add(feature);
//polygons.Add(ReadPolygon((JObject)feature["geometry"]));
}
}
//argh.
GeoJsonReader reader = new GeoJsonReader();
//var result = reader.Read<Polygon>(json);
for (int i = 0; i < found.Count; i++)
{
var feat = found[i];
JObject geom = (JObject)feat["geometry"];
Polygon p = ReadPolygon(geom);
polygons.Add(p);
if (p != null)
{
_log.InfoFormat("found {0} : {1} ", feat["bssid"], p.ToText());
}
}
IGeometry result = null;
if (polygons.Count > 1)
{
for (int i = 0; i < polygons.Count - 1; i++)
{
if ((result == null) || (result.IsEmpty))
{
result = polygons[i];
}
result = OverlayOp.Overlay(result, polygons[i + 1], SpatialFunction.Intersection);
}
}
_log.InfoFormat("YOU ARE HERE {0} ", result);
Clipboard.SetText(result.ToString());
_log.Info("Done -- Copied to clipboard");
}
///<summary>
/// Computes a unary union with no extra optimization, and no short-circuiting.
///</summary>
/// <remarks>
/// Due to the way the overlay operations are implemented, this is still efficient in the case of linear and puntal geometries.
/// </remarks>
/// <param name="g0">A geometry</param>
/// <returns>The union of the input geometry</returns>
private IGeometry UnionNoOpt(IGeometry g0)
{
IGeometry empty = _geomFact.CreatePoint((Coordinate)null);
return(OverlayOp.Overlay(g0, empty, SpatialFunction.Union));
}
public static FeatureClassSDO Intersect(this FeatureClassSDO featureClassSelf, FeatureClassSDO featureClassOther)
{
FeatureClassSDO newFeatureClass = null;
try
{
if (featureClassSelf == null || featureClassOther == null)
{
throw new ArgumentException("对象未实例化");
}
if (featureClassSelf.GeometryTypeNet != featureClassOther.GeometryTypeNet)
{
throw new ArgumentException("空间对象类型错误");
}
if (CompareProperties(featureClassSelf.spatialReference, featureClassOther.spatialReference, typeof(object)))
{
throw new ArgumentException("空间坐标系不一致");
}
newFeatureClass = new FeatureClassSDO()
{
Name = $"{featureClassSelf.Name}_{featureClassOther.Name}",
DisplayFieldName = $"{featureClassSelf.DisplayFieldName}_{featureClassOther.DisplayFieldName}",
Fields = featureClassSelf.Fields,
GeometryType = featureClassSelf.GeometryType,
GeometryTypeNet = featureClassSelf.GeometryTypeNet,
spatialReference = featureClassSelf.spatialReference
};
foreach (var item in featureClassOther.Fields)
{
if (item.Type == enumFieldType.esriFieldTypeGeometry || item.Name.ToLower() == "shape_area")
{
continue;
}
newFeatureClass.Fields.Add(new Field()
{
Alias = $"{featureClassOther.Name}_{item.Alias}",
Type = item.Type,
Name = $"{featureClassOther.Name}_{item.Name}"
});
}
int groupCount = featureClassOther.Features.Count / SpatialDataObtain.MinWorkThreadCount;
Parallel.ForEach(featureClassOther.Features, (otherItem) =>
{
foreach (var selfItem in featureClassSelf.Features)
{
if (otherItem.Geometry.Intersects(selfItem.Geometry))
{
OverlayOp overlayOp = new OverlayOp(otherItem.Geometry, selfItem.Geometry);
Geometry newGeometry = overlayOp.GetResultGeometry(SpatialFunction.Intersection);
Feature newFeature = new Feature();
newFeature.Attributes = new Dictionary <string, object>(selfItem.Attributes);
foreach (var oterAttribute in otherItem.Attributes)
{
Field field = featureClassOther.Fields.Single(item => item.Name == oterAttribute.Key);
if (field.Type == enumFieldType.esriFieldTypeGeometry || field.Name.ToLower() == "shape_area")
{
continue;
}
string newKey = $"{featureClassOther.Name}_{field.Name}";
newFeature.Attributes.Add(newKey, oterAttribute.Value);
}
newFeature.Geometry = newGeometry;
newFeatureClass.AddFeature(newFeature);
}
}
});
return(newFeatureClass);
}
catch (Exception e)
{
LogUtil.Error(e.ToString());
throw;
}
}