/// <summary>
/// Convert polygon from one coordinate system to
/// another coordinate system.
/// </summary>
/// <param name="polygon">Polygon that should be converted.</param>
/// <param name="fromCoordinateSystem">From coordinate system.</param>
/// <param name="toCoordinateSystem">To coordinate system.</param>
/// <returns>Polygon with coordinates according to toCoordinateSystem</returns>
public virtual WebPolygon GetConvertedPolygon(WebPolygon polygon,
WebCoordinateSystem fromCoordinateSystem,
WebCoordinateSystem toCoordinateSystem)
{
Int32 linearRingIndex, toLinearRingIndex;
List <WebLinearRing> fromLinearRings, toLinearRings;
WebPolygon toPolygon;
toPolygon = null;
if (polygon.IsNotNull())
{
toPolygon = new WebPolygon();
fromLinearRings = new List <WebLinearRing>();
for (linearRingIndex = 0; linearRingIndex < polygon.LinearRings.Count; linearRingIndex++)
{
fromLinearRings.Add(polygon.LinearRings[linearRingIndex]);
}
toLinearRings = GetConvertedLinearRings(fromLinearRings, fromCoordinateSystem, toCoordinateSystem);
toLinearRingIndex = 0;
toPolygon.LinearRings = new List <WebLinearRing>();
for (linearRingIndex = 0; linearRingIndex < polygon.LinearRings.Count; linearRingIndex++)
{
toPolygon.LinearRings.Add(toLinearRings[toLinearRingIndex]);
toLinearRingIndex++;
}
}
return(toPolygon);
}
/// <summary>
/// Get a SqlGeography instance with same
/// information as provided WebPolygon.
/// </summary>
/// <param name="polygon">This polygon.</param>
/// <returns>
/// A SqlGeography instance with same
/// information as provided WebPolygon.
/// </returns>
public static SqlGeography GetGeography(this WebPolygon polygon)
{
Boolean isFirstLinearRing;
String comma;
StringBuilder reverseWkt;
try
{
return(SqlGeography.Parse(new SqlString(polygon.GetWkt())));
}
catch (Exception)
{
}
try
{
// Try with points in reverse order.
reverseWkt = new StringBuilder("POLYGON()");
if (polygon.IsNotNull() &&
polygon.LinearRings.IsNotEmpty())
{
isFirstLinearRing = true;
foreach (WebLinearRing linearRing in polygon.LinearRings)
{
if (linearRing.Points.IsNotEmpty())
{
if (isFirstLinearRing)
{
isFirstLinearRing = false;
reverseWkt.Insert(8, "()");
}
else
{
reverseWkt.Insert(8, "(), ");
}
comma = String.Empty;
foreach (WebPoint point in linearRing.Points)
{
reverseWkt.Insert(9, point.X.WebToStringR().Replace(",", ".") + " " + (point.Y.WebToStringR().Replace(",", ".")) + comma);
comma = ", ";
}
}
}
}
return(SqlGeography.Parse(new SqlString(reverseWkt.ToString())));
}
catch (Exception)
{
}
return(null);
}
/// <summary>
/// Convert polygon to JSON format.
/// </summary>
/// <param name="polygon">Plygon that should be converted.</param>
/// <returns>Polygon in JSON format.</returns>
public static String GetJson(this WebPolygon polygon)
{
if (polygon.IsNotNull())
{
return(polygon.LinearRings.GetJson());
}
else
{
return(String.Empty);
}
}
/// <summary>
/// Check that data is valid.
/// </summary>
/// <param name="polygon">The polygon.</param>
public static void CheckData(this WebPolygon polygon)
{
if (polygon.IsNotNull())
{
polygon.LinearRings.CheckNotEmpty("LinearRings");
foreach (WebLinearRing linearRing in polygon.LinearRings)
{
linearRing.CheckData();
}
}
}
/// <summary>
/// Convert a WebBoundingBox instance into a WebPolygon
/// instance with same geographic area.
/// </summary>
/// <param name="boundingBox">Bounding box.</param>
/// <returns>A WebPolygon instance.</returns>
public static WebPolygon GetPolygon(this WebBoundingBox boundingBox)
{
WebLinearRing linearRing;
WebPolygon polygon;
linearRing = new WebLinearRing();
linearRing.Points = new List <WebPoint>();
linearRing.Points.Add(new WebPoint(boundingBox.Min.X, boundingBox.Min.Y));
linearRing.Points.Add(new WebPoint(boundingBox.Max.X, boundingBox.Min.Y));
linearRing.Points.Add(new WebPoint(boundingBox.Max.X, boundingBox.Max.Y));
linearRing.Points.Add(new WebPoint(boundingBox.Min.X, boundingBox.Max.Y));
linearRing.Points.Add(new WebPoint(boundingBox.Min.X, boundingBox.Min.Y));
polygon = new WebPolygon();
polygon.LinearRings = new List <WebLinearRing>();
polygon.LinearRings.Add(linearRing);
return(polygon);
}
/// <summary>
/// Get polygon information in WKT format.
/// </summary>
/// <param name="polygon">This polygon.</param>
/// <returns>Polygon information in WKT format.</returns>
public static String GetWkt(this WebPolygon polygon)
{
Boolean isFirstLinearRing, isFirstPoint;
StringBuilder wkt;
wkt = new StringBuilder("POLYGON");
wkt.Append("(");
if (polygon.LinearRings.IsNotEmpty())
{
isFirstLinearRing = true;
foreach (WebLinearRing linearRing in polygon.LinearRings)
{
if (isFirstLinearRing)
{
isFirstLinearRing = false;
}
else
{
wkt.Append(", ");
}
wkt.Append("(");
if (linearRing.Points.IsNotEmpty())
{
isFirstPoint = true;
foreach (WebPoint point in linearRing.Points)
{
if (isFirstPoint)
{
isFirstPoint = false;
}
else
{
wkt.Append(", ");
}
wkt.Append(point.X.WebToStringR().Replace(",", "."));
wkt.Append(" " + point.Y.WebToStringR().Replace(",", "."));
}
}
wkt.Append(")");
}
}
wkt.Append(")");
return(wkt.ToString());
}
/// <summary>
/// Get polygon from SqlGeometry.
/// </summary>
/// <param name="geometryPolygon">Polygon geometry.</param>
/// <returns>Polygon.</returns>
public static WebPolygon GetPolygon(this SqlGeometry geometryPolygon)
{
Int32 linearRingIndex;
SqlGeometry geometryLinearRing;
WebPolygon polygon;
if (geometryPolygon.GetGeometryType() != SqlGeometryType.Polygon)
{
throw new ArgumentException("Wrong geometry data type in GetPolygon. Expected type 'Polygon', actual type : " + geometryPolygon.GetGeometryType().ToString());
}
polygon = new WebPolygon();
polygon.LinearRings = new List <WebLinearRing>();
geometryLinearRing = geometryPolygon.STExteriorRing();
polygon.LinearRings.Add(geometryLinearRing.GetLinearRing());
for (linearRingIndex = 1; linearRingIndex <= geometryPolygon.STNumInteriorRing(); linearRingIndex++)
{
geometryLinearRing = geometryPolygon.STInteriorRingN(linearRingIndex);
polygon.LinearRings.Add(geometryLinearRing.GetLinearRing());
}
return(polygon);
}
/// <summary>
/// Get bounding box for provided polygon.
/// Currently only 2 dimensions are handled.
/// </summary>
/// <param name="polygon">This polygon.</param>
/// <returns>Bounding box for provided polygon.</returns>
public static WebBoundingBox GetBoundingBox(this WebPolygon polygon)
{
WebBoundingBox boundingBox;
boundingBox = null;
if (polygon.LinearRings.IsNotEmpty() &&
polygon.LinearRings[0].Points.IsNotEmpty())
{
foreach (WebPoint point in polygon.LinearRings[0].Points)
{
if (boundingBox.IsNull())
{
boundingBox = new WebBoundingBox();
boundingBox.Max = point.Clone();
boundingBox.Min = point.Clone();
}
else
{
if (boundingBox.Max.X < point.X)
{
boundingBox.Max.X = point.X;
}
if (boundingBox.Max.Y < point.Y)
{
boundingBox.Max.Y = point.Y;
}
if (boundingBox.Min.X > point.X)
{
boundingBox.Min.X = point.X;
}
if (boundingBox.Min.Y > point.Y)
{
boundingBox.Min.Y = point.Y;
}
}
}
}
return(boundingBox);
}
/// <summary>
/// Test if point is located inside polygon.
/// Currently only two dimensions are handled.
/// </summary>
/// <param name="polygon">This polygon.</param>
/// <param name='point'>Point.</param>
/// <returns>True if point is located inside polygon.</returns>
public static Boolean IsPointInsideGeometry(this WebPolygon polygon,
WebPoint point)
{
return(polygon.GetGeometry().STIntersects(point.GetGeometry()).Value);
}
/// <summary>
/// Get a SqlGeometry instance with same
/// information as provided WebPolygon.
/// </summary>
/// <param name="polygon">This polygon.</param>
/// <returns>
/// A SqlGeometry instance with same
/// information as provided WebPolygon.
/// </returns>
public static SqlGeometry GetGeometry(this WebPolygon polygon)
{
return(SqlGeometry.Parse(new SqlString(polygon.GetWkt())));
}
