/// <summary>
/// Takes an array of simple polygons and combines them into one multi-part shape.
/// </summary>
/// <param name="parts">The array of polygons.</param>
/// <param name="resultShp">The resulting multi-part shape.</param>
public static void CombineParts(ref IFeature[] parts, ref IFeature resultShp)
{
int numParts = parts.Length;
Polygon po = new Polygon(parts[0].Coordinates);
Polygon poly;
for (int i = 0; i <= numParts - 1; i++)
{
poly = new Polygon(parts[i].Coordinates);
po = poly.Union(po) as Polygon;
}
resultShp = new Feature(po);
}
/// <summary>
///
/// </summary>
/// <param name="polygon"></param>
/// <param name="writer"></param>
protected virtual void Write(Polygon polygon, XmlTextWriter writer)
{
writer.WriteStartElement("Polygon");
writer.WriteStartElement("outerBoundaryIs");
Write(polygon.ExteriorRing as LinearRing, writer);
writer.WriteEndElement();
for(int i = 0; i < polygon.NumHoles; i++)
{
writer.WriteStartElement("innerBoundaryIs");
Write(polygon.Holes[i] as LinearRing, writer);
writer.WriteEndElement();
}
writer.WriteEndElement();
}
/// <summary>
///
/// </summary>
/// <param name="polygon"></param>
/// <returns></returns>
protected virtual int SetByteStreamLength(Polygon polygon)
{
int count = InitValue;
count += polygon.NumPoints * CoordSize;
return count;
}
/// <summary>
/// Create a new contains computer for two geometries.
/// </summary>
/// <param name="rectangle">A rectangular geometry.</param>
public RectangleContains(Polygon rectangle)
{
_rectangle = rectangle;
_rectEnv = rectangle.EnvelopeInternal;
}
/// <summary>
/// If the FeatureType is polygon, this is the code for converting the vertex array
/// into a feature.
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
protected IFeature GetPolygon(int index)
{
Feature feature = new Feature();
feature.Envelope = ShapeIndices[index].Extent.ToEnvelope();
ShapeRange shape = ShapeIndices[index];
List<ILinearRing> shells = new List<ILinearRing>();
List<ILinearRing> holes = new List<ILinearRing>();
foreach (PartRange part in shape.Parts)
{
List<Coordinate> coords = new List<Coordinate>();
int i = part.StartIndex;
foreach (Vertex d in part)
{
Coordinate c = new Coordinate(d);
if (M != null && M.Length > 0) c.M = M[i];
if (Z != null && Z.Length > 0) c.Z = Z[i];
i++;
coords.Add(c);
}
LinearRing ring = new LinearRing(coords);
if (shape.Parts.Count == 1)
{
shells.Add(ring);
}
else
{
if (CGAlgorithms.IsCounterClockwise(ring.Coordinates))
{
holes.Add(ring);
}
else
{
shells.Add(ring);
}
//if(part.IsHole())
//{
// holes.Add(ring);
//}
//else
//{
// shells.Add(ring);
//}
}
}
//// Now we have a list of all shells and all holes
List<ILinearRing>[] holesForShells = new List<ILinearRing>[shells.Count];
for (int i = 0; i < shells.Count; i++)
{
holesForShells[i] = new List<ILinearRing>();
}
// Find holes
for (int i = 0; i < holes.Count; i++)
{
ILinearRing testRing = holes[i];
ILinearRing minShell = null;
IEnvelope minEnv = null;
IEnvelope testEnv = testRing.EnvelopeInternal;
Coordinate testPt = testRing.Coordinates[0];
ILinearRing tryRing;
for (int j = 0; j < shells.Count; j++)
{
tryRing = shells[j];
IEnvelope tryEnv = tryRing.EnvelopeInternal;
if (minShell != null)
minEnv = minShell.EnvelopeInternal;
bool isContained = false;
if (tryEnv.Contains(testEnv)
&& (CGAlgorithms.IsPointInRing(testPt, tryRing.Coordinates)
|| (PointInList(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 = tryRing;
}
holesForShells[j].Add(holes[i]);
}
}
}
IPolygon[] 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)
{
feature.BasicGeometry = polygons[0];
}
else
{
// It's a multi part
feature.BasicGeometry = new MultiPolygon(polygons);
}
// feature.FID = feature.RecordNumber; FID is now dynamic
feature.ParentFeatureSet = this;
feature.ShapeIndex = shape;
feature.RecordNumber = shape.RecordNumber;
feature.ContentLength = shape.ContentLength;
feature.ShapeType = shape.ShapeType;
//Attributes handled in the overridden case
return feature;
}
/// <summary>
///
/// </summary>
/// <param name="p"></param>
private void AddPolygon(Polygon p)
{
AddPolygonRing(p.ExteriorRing, Locations.Exterior, Locations.Interior);
for (int i = 0; i < p.NumHoles; i++)
// Holes are topologically labelled opposite to the shell, since
// the interior of the polygon lies on their opposite side
// (on the left, if the hole is oriented CW)
AddPolygonRing(p.GetInteriorRingN(i), Locations.Interior, Locations.Exterior);
}
/// <summary>
///
/// </summary>
/// <param name="rectangle"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool Contains(Polygon rectangle, IGeometry b)
{
RectangleContains rc = new RectangleContains(rectangle);
return rc.Contains(b);
}
/// <summary>
/// If the input geometry is a singular basic geometry, this will become a collection of 1 geometry.
/// If the input geometry is a multi- basic geometry, this will simply ensure that each member
/// is upgraded to a full geometry.
/// </summary>
/// <param name="inGeometry"></param>
/// <param name="inFactory"></param>
public GeometryCollection(IBasicGeometry inGeometry, IGeometryFactory inFactory)
: base(inFactory)
{
if (inGeometry == null)
{
_geometries = new IGeometry[] { };
return;
}
IBasicPolygon pg = inGeometry.GetBasicGeometryN(0) as IBasicPolygon;
if (pg != null)
{
_geometries = new IGeometry[inGeometry.NumGeometries];
for (int iGeom = 0; iGeom < inGeometry.NumGeometries; iGeom++)
{
pg = inGeometry.GetBasicGeometryN(iGeom) as IBasicPolygon;
_geometries[iGeom] = new Polygon(pg);
}
return;
}
IBasicPoint pt = inGeometry.GetBasicGeometryN(0) as IBasicPoint;
if (pt != null)
{
_geometries = new IGeometry[inGeometry.NumGeometries];
for (int iGeom = 0; iGeom < inGeometry.NumGeometries; iGeom++)
{
pt = inGeometry.GetBasicGeometryN(iGeom) as IBasicPoint;
_geometries[iGeom] = new Point(pt);
}
return;
}
IBasicLineString ls = inGeometry.GetBasicGeometryN(0) as IBasicLineString;
if (ls != null)
{
_geometries = new IGeometry[inGeometry.NumGeometries];
for (int iGeom = 0; iGeom < inGeometry.NumGeometries; iGeom++)
{
ls = inGeometry.GetBasicGeometryN(iGeom) as IBasicLineString;
_geometries[iGeom] = new LineString(ls);
}
return;
}
}
/// <summary>
/// Presuming that the specified basic geometry describes a MultiPolygon, this will perform the necessary
/// casting in order to create a MultiPolygon. If, in fact, it is only a BasicMultiPolygon, this will
/// create a new, fully functional MultiPolygon based on the same coordinates.
/// </summary>
/// <param name="inGeometry">The IBasicGeometry to turn into a MultiPolygon. </param>
public static new IMultiPolygon FromBasicGeometry(IBasicGeometry inGeometry)
{
// Multipolygons cast directly
IMultiPolygon result = inGeometry as IMultiPolygon;
if (result != null) return result;
// Polygons are just wrapped in a Multipolygon with the one polygon as an element
IPolygon p = (IPolygon)inGeometry;
if (p != null)
{
return new MultiPolygon(new[] { p });
}
IBasicPolygon bp = (IBasicPolygon)inGeometry;
if (bp != null)
{
return new MultiPolygon(new[] { bp });
}
IPolygon[] polygonArray = new IPolygon[inGeometry.NumGeometries];
// assume that we have some kind of MultiGeometry of IBasicPolygon objects
for (int i = 0; i < inGeometry.NumGeometries; i++)
{
IBasicPolygon ibp = (IBasicPolygon)inGeometry.GetBasicGeometryN(i);
polygonArray[i] = new Polygon(ibp);
}
return new MultiPolygon(polygonArray);
}
/// <summary>
/// The Voronoi Graph calculation creates the lines that form a voronoi diagram
/// </summary>
/// <param name="points">The points to use for creating the tesselation</param>
/// <param name="cropToExtent">The normal polygons have sharp angles that extend like stars.
/// Cropping will ensure that the original featureset extent plus a small extra buffer amount
/// is the outer extent of the polygons. Errors seem to occur if the exact extent is used.</param>
/// <param name="result">The output featureset</param>
/// <param name="progHandler">A progress handler for updating progress information</param>
/// <returns></returns>
public static void VoronoiPolygons(IFeatureSet points, IFeatureSet result, bool cropToExtent, IProgressHandler progHandler)
{
double[] vertices = points.Vertex;
VoronoiGraph gp = Fortune.ComputeVoronoiGraph(vertices);
IEnvelope env = points.Envelope;
env.ExpandBy(env.Width / 100, env.Height / 100);
IPolygon bounds = env.ToPolygon();
// Convert undefined coordinates to a defined coordinate.
HandleBoundaries(gp, env);
for (int i = 0; i < vertices.Length/2; i++)
{
List<VoronoiEdge> myEdges = new List<VoronoiEdge>();
Vector2 v = new Vector2(vertices, i*2);
foreach (VoronoiEdge edge in gp.Edges)
{
if (!v.Equals(edge.RightData) && !v.Equals(edge.LeftData)) continue;
myEdges.Add(edge);
}
List<Coordinate> coords = new List<Coordinate>();
VoronoiEdge firstEdge = myEdges[0];
coords.Add(firstEdge.VVertexA.ToCoordinate());
coords.Add(firstEdge.VVertexB.ToCoordinate());
Vector2 previous = firstEdge.VVertexB;
myEdges.Remove(myEdges[0]);
Vector2 start = firstEdge.VVertexA;
while (myEdges.Count > 0)
{
for (int j = 0; j < myEdges.Count; j++)
{
VoronoiEdge edge = myEdges[j];
if (edge.VVertexA.Equals(previous))
{
previous = edge.VVertexB;
Coordinate c = previous.ToCoordinate();
coords.Add(c);
myEdges.Remove(edge);
break;
}
// couldn't match by adding to the end, so try adding to the beginning
if (edge.VVertexB.Equals(start))
{
start = edge.VVertexA;
coords.Insert(0, start.ToCoordinate());
myEdges.Remove(edge);
break;
}
// I don't like the reverse situation, but it seems necessary.
if (edge.VVertexB.Equals(previous))
{
previous = edge.VVertexA;
Coordinate c = previous.ToCoordinate();
coords.Add(c);
myEdges.Remove(edge);
break;
}
if (edge.VVertexA.Equals(start))
{
start = edge.VVertexB;
coords.Insert(0, start.ToCoordinate());
myEdges.Remove(edge);
break;
}
}
}
for (int j = 0; j < coords.Count; j++)
{
Coordinate cA = coords[j];
// Remove NAN values
if (double.IsNaN(cA.X) || double.IsNaN(cA.Y))
{
coords.Remove(cA);
}
// Remove duplicate coordinates
for (int k = j + 1; k < coords.Count; k++)
{
Coordinate cB = coords[k];
if (cA.Equals2D(cB)) coords.Remove(cB);
}
}
foreach (Coordinate coord in coords)
{
if (double.IsNaN(coord.X) || double.IsNaN(coord.Y))
{
coords.Remove(coord);
}
}
if (coords.Count <= 2) continue;
Polygon pg = new Polygon(coords);
if (cropToExtent)
{
try
{
IGeometry g = pg.Intersection(bounds);
IPolygon p = g as IPolygon;
if (p != null)
{
Feature f = new Feature(p, result);
f.CopyAttributes(points.Features[i]);
}
}
catch (Exception)
{
Feature f = new Feature(pg, result);
f.CopyAttributes(points.Features[i]);
}
}
else
{
Feature f = new Feature(pg, result);
f.CopyAttributes(points.Features[i]);
}
}
return;
}
/// <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(LinearRing shell, Polygon p, GeometryGraph graph)
{
IList<Coordinate> shellPts = shell.Coordinates;
// test if shell is inside polygon shell
LinearRing polyShell = (LinearRing)p.ExteriorRing;
IList<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 = CGAlgorithms.IsPointInRing(shellPt, polyPts);
if (!insidePolyShell) return;
// if no holes, this is an error!
if (p.NumHoles <= 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.NumHoles; i++)
{
LinearRing hole = (LinearRing)p.GetInteriorRingN(i);
badNestedPt = CheckShellInsideHole(shell, hole, graph);
if (badNestedPt == null) return;
}
_validErr = new TopologyValidationError(TopologyValidationErrors.NestedShells, badNestedPt);
}
private static IFeatureSet CreatePolygonFeatureSet()
{
Random rnd = new Random(DateTime.Now.Millisecond);
FeatureSet fs = new FeatureSet(FeatureTypes.Point);
fs.DataTable.Columns.Add("Number", typeof(int));
fs.DataTable.Columns.Add("Letter", typeof(string));
fs.Name = "Test";
for (int i = 0; i < 10; i++)
{
Coordinate center = NextCoordinate(rnd);
List<Coordinate> shell = new List<Coordinate>();
for (int j = 0; j < 10; j++)
{
Coordinate c = new Coordinate();
double dx = 5*Math.Sin(Math.PI*(double) j/(double) 5);
double dy = 5*Math.Cos(Math.PI*(double) j/(double) 5);
c.X = center.X + dx;
c.Y = center.Y + dy;
shell.Add(c);
}
Polygon p = new Polygon(shell);
Feature f = new Feature(p);
fs.Features.Add(f);
f.DataRow["Number"] = i;
f.DataRow["Letter"] = "Shape " + i;
}
return fs;
}
/// <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="geometryFactory">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, IGeometryFactory geometryFactory)
{
int shapeTypeNum = file.ReadInt32();
ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
if ( ! ( shapeType == ShapeGeometryTypes.Polygon || shapeType == ShapeGeometryTypes.PolygonM ||
shapeType == ShapeGeometryTypes.PolygonZ || shapeType == ShapeGeometryTypes.PolygonZM))
throw new ShapefileException("Attempting to load a non-polygon as polygon.");
// Read and for now ignore bounds.
double[] box = new double[4];
for (int i = 0; i < 4; i++)
box[i] = file.ReadDouble();
int numParts = file.ReadInt32();
int numPoints = file.ReadInt32();
int[] partOffsets = new int[numParts];
for (int i = 0; i < numParts; i++)
partOffsets[i] = file.ReadInt32();
ArrayList shells = new ArrayList();
ArrayList holes = new ArrayList();
for (int part = 0; part < numParts; part++)
{
int start = partOffsets[part];
int finish;
if (part == numParts - 1)
finish = numPoints;
else finish = partOffsets[part + 1];
int length = finish - start;
CoordinateList points = new CoordinateList();
for (int i = 0; i < length; i++)
{
Coordinate external = new Coordinate(file.ReadDouble(), file.ReadDouble() );
new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
Coordinate internalCoord = external;
points.Add(internalCoord);
}
ILinearRing ring = geometryFactory.CreateLinearRing(points.ToArray());
// If shape have only a part, jump orientation check and add to shells
if (numParts == 1)
shells.Add(ring);
else
{
// Orientation check
if (CGAlgorithms.IsCounterClockwise(points.ToArray()))
holes.Add(ring);
else shells.Add(ring);
}
}
// Now we have a list of all shells and all holes
ArrayList holesForShells = new ArrayList(shells.Count);
for (int i = 0; i < shells.Count; i++)
holesForShells.Add(new ArrayList());
// Find holes
for (int i = 0; i < holes.Count; i++)
{
LinearRing testRing = (LinearRing) holes[i];
LinearRing minShell = null;
IEnvelope minEnv = null;
IEnvelope testEnv = testRing.EnvelopeInternal;
Coordinate testPt = testRing.GetCoordinateN(0);
LinearRing tryRing;
for (int j = 0; j < shells.Count; j++)
{
tryRing = (LinearRing) shells[j];
IEnvelope tryEnv = tryRing.EnvelopeInternal;
if (minShell != null)
minEnv = minShell.EnvelopeInternal;
bool isContained = false;
CoordinateList coordList = new CoordinateList(tryRing.Coordinates);
if (tryEnv.Contains(testEnv)
&& (CGAlgorithms.IsPointInRing(testPt, coordList.ToArray())
|| (PointInList(testPt, coordList))))
isContained = true;
// Check if this new containing ring is smaller than the current minimum ring
if (isContained)
{
if (minShell == null || minEnv.Contains(tryEnv))
minShell = tryRing;
// 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.
ArrayList holesForThisShell = (ArrayList)holesForShells[j];
holesForThisShell.Add(holes[i]);
}
}
}
IPolygon[] polygons = new Polygon[shells.Count];
for (int i = 0; i < shells.Count; i++)
polygons[i] = geometryFactory.CreatePolygon((LinearRing) shells[i],
(LinearRing[])((ArrayList) holesForShells[i]).ToArray(typeof(LinearRing)));
if (polygons.Length == 1)
return polygons[0];
// It's a multi part
return geometryFactory.CreateMultiPolygon(polygons);
}
/// <summary>
/// updates the auto-filling X and Y coordinates
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(GeoMouseArgs e)
{
if (_standBy) return;
if (_coordinates == null || _coordinates.Count == 0) return;
Coordinate c1 = e.GeographicLocation;
if (_measureDialog.MeasureMode == MeasureModes.Distance)
{
Coordinate c2 = _coordinates[_coordinates.Count-1];
double dx = Math.Abs(c2.X - c1.X);
double dy = Math.Abs(c2.Y - c1.Y);
double dist;
if(Map.Projection != null)
{
if(Map.Projection.IsLatLon)
{
double y = (c2.Y + c1.Y) / 2;
double factor = Math.Cos(y * Math.PI / 180);
dx *= factor;
dist = Math.Sqrt(dx*dx + dy*dy);
dist = dist * 111319.5;
}
else
{
dist = Math.Sqrt(dx * dx + dy * dy);
dist *= Map.Projection.Unit.Meters;
}
}
else
{
dist = Math.Sqrt(dx * dx + dy * dy);
}
_measureDialog.Distance = dist;
_measureDialog.TotalDistance = _previousDistance + dist;
}
else
{
List<Coordinate> tempPolygon = _coordinates.ToList();
tempPolygon.Add(c1);
if (tempPolygon.Count < 3)
{
_measureDialog.Area = 0;
_measureDialog.TotalArea = 0;
if(tempPolygon.Count == 2)
{
Rectangle r = Map.ProjToPixel(new LineString(tempPolygon).Envelope);
r.Inflate(20,20);
Map.Invalidate(r);
}
_mousePosition = e.Location;
return;
}
Polygon pg = new Polygon(new LinearRing(tempPolygon));
double area = pg.Area;
if (Map.Projection != null)
{
if (Map.Projection.IsLatLon)
{
area = area * 111319.5 * 111319.5;
}
else
{
area *= Map.Projection.Unit.Meters * Map.Projection.Unit.Meters;
}
}
_measureDialog.Area = area;
_measureDialog.TotalArea = area;
Rectangle rr = Map.ProjToPixel(pg.Envelope);
rr.Inflate(20, 20);
Map.Invalidate(rr);
_mousePosition = e.Location;
}
if (_coordinates != null && _coordinates.Count > 0)
{
List<System.Drawing.Point> points = new List<System.Drawing.Point>();
foreach (Coordinate coord in _coordinates)
{
points.Add(Map.ProjToPixel(coord));
}
Rectangle oldRect = Global.GetRectangle(_mousePosition, points[points.Count - 1]);
Rectangle newRect = Global.GetRectangle(e.Location, points[points.Count - 1]);
Rectangle invalid = Rectangle.Union(newRect, oldRect);
invalid.Inflate(20, 20);
Map.Invalidate(invalid);
}
_mousePosition = e.Location;
base.OnMouseMove(e);
}
/// <summary>
/// Executes the ClipPolygonWithLine Operation tool programaticaly.
/// Ping deleted static for external testing 01/2010
/// </summary>
/// <param name="input1">The input Polygon FeatureSet.</param>
/// <param name="input2">The input Polyline FeatureSet.</param>
/// <param name="output">The output Polygon FeatureSet.</param>
/// <param name="cancelProgressHandler">The progress handler.</param>
/// <returns></returns>
public bool Execute(IFeatureSet input1, IFeatureSet input2, IFeatureSet output, ICancelProgressHandler cancelProgressHandler)
{
//Validates the input and output data
if (input1 == null || input2 == null || output == null)
{
return false;
}
if (cancelProgressHandler.Cancel)
return false;
IFeature polygon = input1.Features[0];
IFeature line = input2.Features[0];
IFeatureSet resultFS = new FeatureSet(FeatureTypes.Polygon);
int previous = 0;
if (DoClipPolygonWithLine(ref polygon, ref line, ref output) == false)
{
throw new SystemException(TextStrings.Exceptioninclipin);
}
int intFeature = output.Features.Count;
for (int i = 0; i < intFeature; i++)
{
Polygon poly = new Polygon(output.Features[i].Coordinates);
resultFS.AddFeature(poly);
int current = Convert.ToInt32(Math.Round(i * 100D / intFeature));
//only update when increment in percentage
if (current > previous)
cancelProgressHandler.Progress("", current, current + TextStrings.progresscompleted);
previous = current;
}
cancelProgressHandler.Progress("", 100, 100 + TextStrings.progresscompleted);
resultFS.SaveAs(output.Filename, true);
return true;
}
/// <summary>
/// Constructs a <c>MultiPolygon</c>.
/// </summary>
/// <param name="polygons">
/// The <c>Polygon</c>s for this <c>MultiPolygon</c>
/// , or <c>null</c> or an empty array to create the empty point.
/// Elements may be empty <c>Polygon</c>s, but not <c>null</c>
/// s. The polygons must conform to the assertions specified in the
/// <see href="http://www.opengis.org/techno/specs.htm"/> OpenGIS Simple Features
/// Specification for SQL.
/// </param>
/// <remarks>
/// For create this <see cref="Geometry"/> is used a standard <see cref="GeometryFactory"/>
/// with <see cref="PrecisionModel" /> <c> == </c> <see cref="PrecisionModels.Floating"/>.
/// </remarks>
public MultiPolygon(Polygon[] polygons) : this(polygons, DefaultFactory) { }
/// <summary>
///
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
protected virtual IGeometry ReadMultiPolygon(BinaryReader reader)
{
int numGeometries = reader.ReadInt32();
Polygon[] polygons = new Polygon[numGeometries];
for (int i = 0; i < numGeometries; i++)
{
ReadByteOrder(reader);
WkbGeometryTypes geometryType = (WkbGeometryTypes)reader.ReadInt32();
if (geometryType != WkbGeometryTypes.Polygon)
throw new ArgumentException("Polygon feature expected");
polygons[i] = ReadPolygon(reader) as Polygon;
}
return Factory.CreateMultiPolygon(polygons);
}
/// <summary>
///
/// </summary>
/// <param name="rectangle"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool Intersects(Polygon rectangle, IGeometry b)
{
RectangleIntersects rp = new RectangleIntersects(rectangle);
return rp.Intersects(b);
}
