/// <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();
}
}
}