/// <summary>
///
/// </summary>
/// <returns></returns>
public bool IsNonNested()
{
foreach (var innerRing in rings)
{
var innerRingPts = innerRing.Coordinates;
foreach (var searchRing in rings)
{
var searchRingPts = searchRing.Coordinates;
if (innerRing == searchRing)
{
continue;
}
if (!innerRing.EnvelopeInternal.Intersects(searchRing.EnvelopeInternal))
{
continue;
}
var innerRingPt = IsValidOp.FindPointNotNode(innerRingPts, searchRing, graph);
Assert.IsTrue(innerRingPt != null, "Unable to find a ring point not a node of the search ring");
bool isInside = PointLocation.IsInRing(innerRingPt, searchRingPts);
if (isInside)
{
nestedPt = innerRingPt;
return(false);
}
}
}
return(true);
}
/// <summary>
/// Find the innermost enclosing shell EdgeRing containing the argument EdgeRing, if any.
/// The innermost enclosing ring is the <i>smallest</i> enclosing ring.
/// The algorithm used depends on the fact that:
/// ring A contains ring B iff envelope(ring A) contains envelope(ring B).
/// This routine is only safe to use if the chosen point of the hole
/// is known to be properly contained in a shell
/// (which is guaranteed to be the case if the hole does not touch its shell).
/// </summary>
/// <param name="testEr"></param>
/// <param name="shellList"></param>
/// <returns>Containing EdgeRing, if there is one <br/> or
/// <value>null</value> if no containing EdgeRing is found.</returns>
private static EdgeRing FindEdgeRingContaining(EdgeRing testEr, IEnumerable <EdgeRing> shellList)
{
var teString = testEr.LinearRing;
var testEnv = teString.EnvelopeInternal;
var testPt = teString.GetCoordinateN(0);
EdgeRing minShell = null;
Envelope minEnv = null;
foreach (var tryShell in shellList)
{
var tryRing = tryShell.LinearRing;
var tryEnv = tryRing.EnvelopeInternal;
if (minShell != null)
{
minEnv = minShell.LinearRing.EnvelopeInternal;
}
bool isContained = false;
if (tryEnv.Contains(testEnv) && PointLocation.IsInRing(testPt, tryRing.Coordinates))
{
isContained = true;
}
// check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
if (minShell == null || minEnv.Contains(tryEnv))
{
minShell = tryShell;
}
}
}
return(minShell);
}
/// <summary>
/// This routine checks to see if a shell is properly contained in a hole.
/// It assumes that the edges of the shell and hole do not
/// properly intersect.
/// </summary>
/// <param name="shell"></param>
/// <param name="hole"></param>
/// <param name="graph"></param>
/// <returns>
/// <c>null</c> if the shell is properly contained, or
/// a Coordinate which is not inside the hole if it is not.
/// </returns>
private Coordinate CheckShellInsideHole(ILinearRing shell, ILinearRing hole, GeometryGraph graph)
{
Coordinate[] shellPts = shell.Coordinates;
Coordinate[] holePts = hole.Coordinates;
// TODO: improve performance of this - by sorting pointlists?
Coordinate shellPt = FindPointNotNode(shellPts, hole, graph);
// if point is on shell but not hole, check that the shell is inside the hole
if (shellPt != null)
{
bool insideHole = PointLocation.IsInRing(shellPt, holePts);
if (!insideHole)
{
return(shellPt);
}
}
Coordinate holePt = FindPointNotNode(holePts, shell, graph);
// if point is on hole but not shell, check that the hole is outside the shell
if (holePt != null)
{
bool insideShell = PointLocation.IsInRing(holePt, shellPts);
if (insideShell)
{
return(holePt);
}
return(null);
}
Assert.ShouldNeverReachHere("points in shell and hole appear to be equal");
return(null);
}
public bool IsNonNested()
{
BuildIndex();
for (int i = 0; i < _rings.Count; i++)
{
var innerRing = (ILinearRing)_rings[i];
Coordinate[] innerRingPts = innerRing.Coordinates;
var results = _index.Query(innerRing.EnvelopeInternal);
for (int j = 0; j < results.Count; j++)
{
var searchRing = (ILinearRing)results[j];
var searchRingPts = searchRing.Coordinates;
if (innerRing == searchRing)
{
continue;
}
if (!innerRing.EnvelopeInternal.Intersects(searchRing.EnvelopeInternal))
{
continue;
}
Coordinate innerRingPt = IsValidOp.FindPointNotNode(innerRingPts, searchRing, _graph);
// Diego Guidi: removed => see Issue 121
//Assert.IsTrue(innerRingPt != null, "Unable to find a ring point not a node of the search ring");
/**
* If no non-node pts can be found, this means
* that the searchRing touches ALL of the innerRing vertices.
* This indicates an invalid polygon, since either
* the two holes create a disconnected interior,
* or they touch in an infinite number of points
* (i.e. along a line segment).
* Both of these cases are caught by other tests,
* so it is safe to simply skip this situation here.
*/
if (innerRingPt == null)
{
continue;
}
Boolean isInside = PointLocation.IsInRing(innerRingPt, searchRingPts);
if (isInside)
{
_nestedPt = innerRingPt;
return(false);
}
}
}
return(true);
}
/// <summary>
/// Tests whether the point pt is contained in the triangle defined by 3 <see cref="QuadEdge"/>es.
/// </summary>
/// <param name="tri">an array containing at least 3 QuadEdges</param>
/// <param name="pt">the point to test</param>
/// <returns>true if the point is contained in the triangle</returns>
public static bool Contains(QuadEdge[] tri, Coordinate pt)
{
var ring = new[]
{
tri[0].Orig.Coordinate,
tri[1].Orig.Coordinate,
tri[2].Orig.Coordinate,
tri[0].Orig.Coordinate
};
return(PointLocation.IsInRing(pt, ring));
}
/// <summary>
/// Check if a shell is incorrectly nested within a polygon. This is the case
/// if the shell is inside the polygon shell, but not inside a polygon hole.
/// (If the shell is inside a polygon hole, the nesting is valid.)
/// The algorithm used relies on the fact that the rings must be properly contained.
/// E.g. they cannot partially overlap (this has been previously checked by
/// <c>CheckRelateConsistency</c>).
/// </summary>
private void CheckShellNotNested(ILinearRing shell, IPolygon p, GeometryGraph graph)
{
Coordinate[] shellPts = shell.Coordinates;
// test if shell is inside polygon shell
ILinearRing polyShell = p.Shell;
Coordinate[] polyPts = polyShell.Coordinates;
Coordinate shellPt = FindPointNotNode(shellPts, polyShell, graph);
// if no point could be found, we can assume that the shell is outside the polygon
if (shellPt == null)
{
return;
}
bool insidePolyShell = PointLocation.IsInRing(shellPt, polyPts);
if (!insidePolyShell)
{
return;
}
// if no holes, this is an error!
if (p.NumInteriorRings <= 0)
{
_validErr = new TopologyValidationError(TopologyValidationErrors.NestedShells, shellPt);
return;
}
/*
* Check if the shell is inside one of the holes.
* This is the case if one of the calls to checkShellInsideHole
* returns a null coordinate.
* Otherwise, the shell is not properly contained in a hole, which is an error.
*/
Coordinate badNestedPt = null;
for (int i = 0; i < p.NumInteriorRings; i++)
{
ILinearRing hole = p.Holes[i];
badNestedPt = CheckShellInsideHole(shell, hole, graph);
if (badNestedPt == null)
{
return;
}
}
_validErr = new TopologyValidationError(TopologyValidationErrors.NestedShells, badNestedPt);
}
/// <summary>
/// Find the innermost enclosing shell EdgeRing containing the argument EdgeRing, if any.
/// The innermost enclosing ring is the <i>smallest</i> enclosing ring.
/// The algorithm used depends on the fact that:
/// ring A contains ring B iff envelope(ring A) contains envelope(ring B).
/// This routine is only safe to use if the chosen point of the hole
/// is known to be properly contained in a shell
/// (which is guaranteed to be the case if the hole does not touch its shell).
/// </summary>
/// <param name="shellList"></param>
/// <param name="testEr"></param>
/// <returns>Containing EdgeRing, if there is one <br/>
/// or <value>null</value> if no containing EdgeRing is found.</returns>
public static EdgeRing FindEdgeRingContaining(EdgeRing testEr, IList <EdgeRing> shellList)
{
var testRing = testEr.Ring;
var testEnv = testRing.EnvelopeInternal;
//var testPt = testRing.GetCoordinateN(0);
EdgeRing minShell = null;
Envelope minShellEnv = null;
foreach (var tryShell in shellList)
{
var tryShellRing = tryShell.Ring;
var tryShellEnv = tryShellRing.EnvelopeInternal;
if (minShell != null)
{
minShellEnv = minShell.Ring.EnvelopeInternal;
}
// the hole envelope cannot equal the shell envelope
// (also guards against testing rings against themselves)
if (tryShellEnv.Equals(testEnv))
{
continue;
}
// hole must be contained in shell
if (!tryShellEnv.Contains(testEnv))
{
continue;
}
var testPt = CoordinateArrays.PointNotInList(testRing.Coordinates, tryShellRing.Coordinates);
var isContained = PointLocation.IsInRing(testPt, tryShellRing.Coordinates);
// check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
if (minShell == null || minShellEnv.Contains(tryShellEnv))
{
minShell = tryShell;
minShellEnv = minShell.Ring.EnvelopeInternal;
}
}
}
return(minShell);
}
/// <summary>
/// Find the innermost enclosing shell EdgeRing containing the argument EdgeRing, if any.
/// The innermost enclosing ring is the <i>smallest</i> enclosing ring.
/// The algorithm used depends on the fact that:
/// ring A contains ring B iff envelope(ring A) contains envelope(ring B).
/// This routine is only safe to use if the chosen point of the hole
/// is known to be properly contained in a shell
/// (which is guaranteed to be the case if the hole does not touch its shell).
/// </summary>
/// <param name="testEr"></param>
/// <param name="shellList"></param>
/// <returns>Containing EdgeRing, if there is one <br/> or
/// <c>null</c> if no containing EdgeRing is found.</returns>
private static EdgeRing FindEdgeRingContaining(EdgeRing testEr, IEnumerable <EdgeRing> shellList)
{
var teString = testEr.LinearRing;
var testEnv = teString.EnvelopeInternal;
var testPt = teString.GetCoordinateN(0);
EdgeRing minShell = null;
Envelope minShellEnv = null;
foreach (var tryShell in shellList)
{
var tryShellRing = tryShell.LinearRing;
var tryShellEnv = tryShellRing.EnvelopeInternal;
// the hole envelope cannot equal the shell envelope
// (also guards against testing rings against themselves)
if (tryShellEnv.Equals(testEnv))
{
continue;
}
// hole must be contained in shell
if (!tryShellEnv.Contains(testEnv))
{
continue;
}
bool isContained = false;
if (PointLocation.IsInRing(testPt, tryShellRing.Coordinates))
{
isContained = true;
}
// check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
if (minShell == null || minShellEnv.Contains(tryShellEnv))
{
minShell = tryShell;
minShellEnv = tryShellEnv;
}
}
}
return(minShell);
}
/// <summary>
///
/// </summary>
/// <param name="innerRing"></param>
/// <param name="searchRing"></param>
/// <returns></returns>
private bool IsInside(LinearRing innerRing, LinearRing searchRing)
{
var innerRingPts = innerRing.Coordinates;
var searchRingPts = searchRing.Coordinates;
if (!innerRing.EnvelopeInternal.Intersects(searchRing.EnvelopeInternal))
{
return(false);
}
var innerRingPt = IsValidOp.FindPointNotNode(innerRingPts, searchRing, graph);
Assert.IsTrue(innerRingPt != null, "Unable to find a ring point not a node of the search ring");
bool isInside = PointLocation.IsInRing(innerRingPt, searchRingPts);
if (isInside)
{
nestedPt = innerRingPt;
return(true);
}
return(false);
}
protected override void RunPtInRing(Location expectedLoc, Coordinate pt, string wkt)
{
// isPointInRing is not defined for pts on boundary
if (expectedLoc == Location.Boundary)
{
return;
}
var geom = reader.Read(wkt);
bool expected = expectedLoc == Location.Interior;
Assert.AreEqual(expected, PointLocation.IsInRing(pt, geom.Coordinates));
var poly = geom as IPolygon;
if (poly == null)
{
return;
}
Assert.AreEqual(expected, PointLocation.IsInRing(pt, poly.ExteriorRing.CoordinateSequence));
}
/// <summary>
/// This method will cause the ring to be computed.
/// It will also check any holes, if they have been assigned.
/// </summary>
/// <param name="p"></param>
public bool ContainsPoint(Coordinate p)
{
ILinearRing shell = LinearRing;
Envelope env = shell.EnvelopeInternal;
if (!env.Contains(p))
{
return(false);
}
if (!PointLocation.IsInRing(p, shell.Coordinates))
{
return(false);
}
foreach (EdgeRing hole in _holes)
{
if (hole.ContainsPoint(p))
{
return(false);
}
}
return(true);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool IsNonNested()
{
BuildQuadtree();
for (int i = 0; i < _rings.Count; i++)
{
var innerRing = _rings[i];
var innerRingPts = innerRing.Coordinates;
var results = _quadtree.Query(innerRing.EnvelopeInternal);
for (int j = 0; j < results.Count; j++)
{
var searchRing = results[j];
var searchRingPts = searchRing.Coordinates;
if (innerRing == searchRing)
{
continue;
}
if (!innerRing.EnvelopeInternal.Intersects(searchRing.EnvelopeInternal))
{
continue;
}
var innerRingPt = IsValidOp.FindPointNotNode(innerRingPts, searchRing, _graph);
Assert.IsTrue(innerRingPt != null, "Unable to find a ring point not a node of the search ring");
bool isInside = PointLocation.IsInRing(innerRingPt, searchRingPts);
if (isInside)
{
_nestedPt = innerRingPt;
return(false);
}
}
}
return(true);
}
public bool Contains(Coordinate pt)
{
var ring = GetCoordinates();
return(PointLocation.IsInRing(pt, ring));
}
private void ReadPolygonShape(Shape shape)
{
List <LinearRing> shells = new();
List <LinearRing> holes = new();
foreach (PartRange part in shape.Range.Parts)
{
List <Coordinate> coords = new();
int i = part.StartIndex;
foreach (Vertex d in part)
{
Coordinate c = new(d.X, d.Y);
if (shape.M != null && shape.M.Length > 0)
{
c.M = shape.M[i];
}
if (shape.Z != null && shape.Z.Length > 0)
{
c.Z = shape.Z[i];
}
i++;
coords.Add(c);
}
LinearRing ring = new(coords.ToArray());
if (shape.Range.Parts.Count == 1)
{
shells.Add(ring);
}
else
{
if (ring.IsCCW)
{
holes.Add(ring);
}
else
{
shells.Add(ring);
}
}
}
if (shells.Count == 0 && holes.Count > 0)
{
shells = holes;
holes = new List <LinearRing>();
}
//// Now we have a list of all shells and all holes
List <LinearRing>[] holesForShells = new List <LinearRing> [shells.Count];
for (int i = 0; i < shells.Count; i++)
{
holesForShells[i] = new List <LinearRing>();
}
// Find holes
foreach (LinearRing hole in holes)
{
LinearRing minShell = null;
Envelope minEnv = null;
Envelope testEnv = hole.EnvelopeInternal;
Coordinate testPt = hole.Coordinates[0];
for (int j = 0; j < shells.Count; j++)
{
LinearRing tryRing = shells[j];
Envelope tryEnv = tryRing.EnvelopeInternal;
if (minShell != null)
{
minEnv = minShell.EnvelopeInternal;
}
// Check if this new containing ring is smaller than the current minimum ring
if (tryEnv.Contains(testEnv) && (PointLocation.IsInRing(testPt, tryRing.Coordinates) || PointInList(testPt, tryRing.Coordinates)))
{
if (minShell == null || minEnv.Contains(tryEnv))
{
minShell = tryRing;
}
holesForShells[j].Add(hole);
}
}
}
var polygons = new Polygon[shells.Count];
for (int i = 0; i < shells.Count; i++)
{
polygons[i] = new Polygon(shells[i], holesForShells[i].ToArray());
}
if (polygons.Length == 1)
{
_geometry = polygons[0];
}
else
{
// It's a multi part
_geometry = new MultiPolygon(polygons);
}
_featureType = FeatureType.Polygon;
}
/// <summary>
/// Reads a stream and converts the shapefile record to an equilivent geometry object.
/// </summary>
/// <param name="file">The stream to read.</param>
/// <param name="totalRecordLength">Total length of the record we are about to read</param>
/// <param name="factory">The geometry factory to use when making the object.</param>
/// <returns>The Geometry object that represents the shape file record.</returns>
public override IGeometry Read(BigEndianBinaryReader file, int totalRecordLength, IGeometryFactory factory)
{
int totalRead = 0;
var type = (ShapeGeometryType)ReadInt32(file, totalRecordLength, ref totalRead);
if (type == ShapeGeometryType.NullShape)
{
return(factory.CreatePolygon(null, null));
}
if (type != ShapeType)
{
throw new ShapefileException(string.Format("Encountered a '{0}' instead of a '{1}'", type, ShapeType));
}
// Read and for now ignore bounds.
var bblength = GetBoundingBoxLength();
boundingBox = new double[bblength];
for (; boundingBoxIndex < 4; boundingBoxIndex++)
{
boundingBox[boundingBoxIndex] = ReadDouble(file, totalRecordLength, ref totalRead);
}
var numParts = ReadInt32(file, totalRecordLength, ref totalRead);
var numPoints = ReadInt32(file, totalRecordLength, ref totalRead);
var partOffsets = new int[numParts];
for (var i = 0; i < numParts; i++)
{
partOffsets[i] = ReadInt32(file, totalRecordLength, ref totalRead);
}
var skippedList = new HashSet <int>();
//var allPoints = new List<Coordinate>();
var buffer = new CoordinateBuffer(numPoints, NoDataBorderValue, true);
var pm = factory.PrecisionModel;
for (var part = 0; part < numParts; part++)
{
var start = partOffsets[part];
var finish = (part == numParts - 1)
? numPoints
: partOffsets[part + 1];
var length = finish - start;
for (var i = 0; i < length; i++)
{
var x = pm.MakePrecise(ReadDouble(file, totalRecordLength, ref totalRead));
var y = pm.MakePrecise(ReadDouble(file, totalRecordLength, ref totalRead));
// Thanks to Abhay Menon!
if (!(Coordinate.NullOrdinate.Equals(x) || Coordinate.NullOrdinate.Equals(y)))
{
buffer.AddCoordinate(x, y);
}
else
{
skippedList.Add(start + i);
}
}
//Add a marker that we have finished one part of the geometry
buffer.AddMarker();
}
// Trond Benum: We have now read all the parts, let's read optional Z and M values
// and populate Z in the coordinate before we start manipulating the segments
// We have to track corresponding optional M values and set them up in the
// Geometries via ICoordinateSequence further down.
GetZMValues(file, totalRecordLength, ref totalRead, buffer, skippedList);
// Get the resulting sequences
var sequences = buffer.ToSequences(factory.CoordinateSequenceFactory);
var shells = new List <ILinearRing>();
var holes = new List <ILinearRing>();
for (var i = 0; i < sequences.Length; i++)
{
//Skip garbage input data with 0 points
if (sequences[i].Count < 1)
{
continue;
}
var tmp = EnsureClosedSequence(sequences[i], factory.CoordinateSequenceFactory);
var ring = factory.CreateLinearRing(tmp);
if (ring.IsCCW)
{
holes.Add(ring);
}
else
{
shells.Add(ring);
}
}
// Ensure the ring is encoded right
if (shells.Count == 0 && holes.Count == 1)
{
shells.Add(factory.CreateLinearRing(holes[0].CoordinateSequence.Reversed()));
holes.Clear();
}
// Now we have lists of all shells and all holes
var holesForShells = new List <List <ILinearRing> >(shells.Count);
for (var i = 0; i < shells.Count; i++)
{
holesForShells.Add(new List <ILinearRing>());
}
//Thanks to Bruno.Labrecque
//Sort shells by area, rings should only be added to the smallest shell, that contains the ring
shells.Sort(ProbeLinearRing);
// Find holes
foreach (var testHole in holes)
{
var testEnv = testHole.EnvelopeInternal;
var testPt = testHole.GetCoordinateN(0);
//We have the shells sorted
for (var j = 0; j < shells.Count; j++)
{
var tryShell = shells[j];
var tryEnv = tryShell.EnvelopeInternal;
var isContained = tryEnv.Contains(testEnv) && PointLocation.IsInRing(testPt, tryShell.Coordinates);
// Check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
// Suggested by Brian Macomber and added 3/28/2006:
// holes were being found but never added to the holesForShells array
// so when converted to geometry by the factory, the inner rings were never created.
var holesForThisShell = holesForShells[j];
holesForThisShell.Add(testHole);
//Suggested by Bruno.Labrecque
//A LinearRing should only be added to one outer shell
break;
}
}
}
var polygons = new IPolygon[shells.Count];
for (var i = 0; i < shells.Count; i++)
{
polygons[i] = (factory.CreatePolygon(shells[i], holesForShells[i].ToArray()));
}
if (polygons.Length == 1)
{
geom = polygons[0];
}
else
{
geom = factory.CreateMultiPolygon(polygons);
}
return(geom);
}
/// <summary>
/// Creates a Polygon or MultiPolygon from this Polygon shape.
/// </summary>
/// <param name="factory">The GeometryFactory to use to create the new Geometry.</param>
/// <returns>The Polygon or IMultiPolygon created from this shape.</returns>
protected Geometry FromPolygon(GeometryFactory factory)
{
if (factory == null)
{
factory = Geometry.DefaultFactory;
}
List <LinearRing> shells = new();
List <LinearRing> holes = new();
foreach (var part in Range.Parts)
{
var coords = GetCoordinates(part);
var ring = factory.CreateLinearRing(coords.ToArray());
if (Range.Parts.Count == 1)
{
shells.Add(ring);
}
else
{
if (ring.IsCCW)
{
holes.Add(ring);
}
else
{
shells.Add(ring);
}
}
}
// Now we have a list of all shells and all holes
List <LinearRing>[] holesForShells = new List <LinearRing> [shells.Count];
for (int i = 0; i < shells.Count; i++)
{
holesForShells[i] = new List <LinearRing>();
}
// Find holes
foreach (LinearRing t in holes)
{
LinearRing testRing = t;
LinearRing minShell = null;
Envelope minEnv = null;
Envelope testEnv = testRing.EnvelopeInternal;
Coordinate testPt = testRing.Coordinates[0];
for (int j = 0; j < shells.Count; j++)
{
LinearRing tryRing = shells[j];
Envelope tryEnv = tryRing.EnvelopeInternal;
if (minShell != null)
{
minEnv = minShell.EnvelopeInternal;
}
var isContained = tryEnv.Contains(testEnv) && (PointLocation.IsInRing(testPt, tryRing.Coordinates) || PointInList(testPt, tryRing.Coordinates));
// Check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
if (minShell == null || minEnv.Contains(tryEnv))
{
minShell = tryRing;
}
holesForShells[j].Add(t);
}
}
}
var polygons = new Polygon[shells.Count];
for (int i = 0; i < shells.Count; i++)
{
polygons[i] = factory.CreatePolygon(shells[i], holesForShells[i].ToArray());
}
if (polygons.Length == 1)
{
return(polygons[0]);
}
// It's a multi part
return(factory.CreateMultiPolygon(polygons));
}
