/// <summary>
/// Read a shapefile MultiPoint record.
/// </summary>
/// <param name="stream">Input stream.</param>
/// <param name="record">Shapefile record to be updated.</param>
private static void ReadMultipoint(Stream stream, ShapeFileRecord record)
{
// Bounding Box.
record.XMin = ShapeFile.ReadDouble64_LE(stream);
record.YMin = ShapeFile.ReadDouble64_LE(stream);
record.XMax = ShapeFile.ReadDouble64_LE(stream);
record.YMax = ShapeFile.ReadDouble64_LE(stream);
// Num Points.
int numPoints = ShapeFile.ReadInt32_LE(stream);
// Points.
for (int i = 0; i < numPoints; i++)
{
Point p = new Point();
p.X = ShapeFile.ReadDouble64_LE(stream);
p.Y = ShapeFile.ReadDouble64_LE(stream);
record.Points.Add(p);
}
}
/// <summary>
/// Read a shapefile Polygon record.
/// </summary>
/// <param name="stream">Input stream.</param>
/// <param name="record">Shapefile record to be updated.</param>
private static void ReadPolygon( Stream stream, ShapeFileRecord record )
{
// Bounding Box.
record.XMin = ShapeFile.ReadDouble64_LE( stream );
record.YMin = ShapeFile.ReadDouble64_LE( stream );
record.XMax = ShapeFile.ReadDouble64_LE( stream );
record.YMax = ShapeFile.ReadDouble64_LE( stream );
// Num Parts and Points.
int numParts = ShapeFile.ReadInt32_LE( stream );
int numPoints = ShapeFile.ReadInt32_LE( stream );
// Parts.
for( int i = 0; i < numParts; i++ )
{
record.Parts.Add( ShapeFile.ReadInt32_LE( stream ) );
}
// Points.
for( int i = 0; i < numPoints; i++ )
{
Point p = new Point();
p.X = ShapeFile.ReadDouble64_LE( stream );
p.Y = ShapeFile.ReadDouble64_LE( stream );
record.Points.Add( p );
}
}
/// <summary>
/// Read a shapefile record.
/// </summary>
/// <param name="stream">Input stream.</param>
public ShapeFileRecord ReadShapeFileRecord( Stream stream )
{
ShapeFileRecord record = new ShapeFileRecord();
// Record Header.
record.RecordNumber = ShapeFile.ReadInt32_BE( stream );
record.ContentLength = ShapeFile.ReadInt32_BE( stream );
// Shape Type.
record.ShapeType = ShapeFile.ReadInt32_LE( stream );
// Read the shape geometry, depending on its type.
switch( record.ShapeType )
{
case ( int ) ShapeType.NullShape:
// Do nothing.
break;
case ( int ) ShapeType.Point:
ShapeFile.ReadPoint( stream, record );
break;
case ( int ) ShapeType.PolyLine:
// PolyLine has exact same structure as Polygon in shapefile.
ShapeFile.ReadPolygon( stream, record );
break;
case ( int ) ShapeType.Polygon:
ShapeFile.ReadPolygon( stream, record );
break;
case ( int ) ShapeType.Multipoint:
ShapeFile.ReadMultipoint( stream, record );
break;
default:
{
string msg = String.Format( System.Globalization.CultureInfo.InvariantCulture, "ShapeType {0} is not supported.", ( int ) record.ShapeType );
throw new NotSupportedException( msg );
}
}
// Add the record to our internal list.
this.records.Add( record );
return record;
}
/// <summary>
/// Read a shapefile Point record.
/// </summary>
/// <param name="stream">Input stream.</param>
/// <param name="record">Shapefile record to be updated.</param>
private static void ReadPoint( Stream stream, ShapeFileRecord record )
{
// Points - add a single point.
Point p = new System.Windows.Point();
p.X = ShapeFile.ReadDouble64_LE( stream );
p.Y = ShapeFile.ReadDouble64_LE( stream );
record.Points.Add( p );
// Bounding Box.
record.XMin = p.X;
record.YMin = p.Y;
record.XMax = record.XMin;
record.YMax = record.YMin;
}
private static ESRI.ArcGIS.Client.Geometry.Geometry GetPolygon(ShapeFileRecord record)
{
Random rnd = new Random();
Polygon polygon = new Polygon();
SpatialReference geoReference = new SpatialReference(4326);
try
{
for (int i = 0; i < record.NumberOfParts; i++)
{
// Determine the starting index and the end index
// into the points array that defines the figure.
int start = record.Parts[i];
int end;
if (record.NumberOfParts > 1 && i != (record.NumberOfParts - 1))
{
end = record.Parts[i + 1];
}
else
{
end = record.NumberOfPoints;
}
ESRI.ArcGIS.Client.Geometry.PointCollection points = new ESRI.ArcGIS.Client.Geometry.PointCollection();
// Add line segments to the polyline
bool isWebMercator = false;
if (record.Points.Count > 0)
{
if (record.Points[0].Y < -90 || record.Points[0].Y > 90)
{
isWebMercator = true;
}
else
{
polygon.SpatialReference = geoReference;
}
}
for (int j = start; j < end; j++)
{
if (record.NumberOfPoints < 5000 || rnd.Next(0, 5) == 1)
{
System.Windows.Point point = record.Points[j];
if (isWebMercator)
{
points.Add(new MapPoint(point.X, point.Y));
}
else
{
points.Add(new MapPoint(point.X, point.Y, geoReference));
}
if (leftMostPoint == 0)
{
leftMostPoint = point.X;
rightMostPoint = point.X;
topMostPoint = point.Y;
bottomMostPoint = point.Y;
}
else
{
if (point.X < leftMostPoint)
{
leftMostPoint = point.X;
}
if (point.X > rightMostPoint)
{
rightMostPoint = point.X;
}
if (point.Y < topMostPoint)
{
topMostPoint = point.Y;
}
if (point.Y > bottomMostPoint)
{
bottomMostPoint = point.Y;
}
}
}
}
polygon.Rings.Add(points);
}
}
catch (Exception ex)
{
//
}
return(polygon);
}