private static void AppendGeometryTaggedText(EsriGeometry geometry, StringWriter writer)
{
if (geometry == null)
{
throw new NullReferenceException("Cannot write Well-Known Text: geometry was null");
}
if (geometry is EsriPoint)
{
var point = geometry as EsriPoint;
AppendPointTaggedText(point, writer);
}
else if (geometry is EsriPolyline)
{
var pl = (EsriPolyline)geometry;
if (pl.Paths.Count == 1)
{
AppendLineStringTaggedText(geometry as EsriPolyline, writer);
}
else if (pl.Paths.Count > 1)
{
AppendMultiLineStringTaggedText(geometry as EsriPolyline, writer);
}
}
else if (geometry is EsriPolygon)
{
var plo = (EsriPolygon)geometry;
if (plo.Rings.Count == 1)
{
AppendPolygonTaggedText(geometry as EsriPolygon, writer);
}
else if (plo.Rings.Count > 1)
{
AppendMultiPolygonTaggedText(geometry as EsriPolygon, writer);
}
}
else if (geometry is EsriMultiPoint)
{
AppendMultiPointTaggedText(geometry as EsriMultiPoint, writer);
}
else if (geometry is EsriExtent)
{
var ply = new EsriPolygon();
EsriPointCollection pc = new EsriPointCollection();
EsriExtent ev = geometry as EsriExtent;
pc.Add(new EsriPoint(ev.XMin, ev.YMin));
pc.Add(new EsriPoint(ev.XMax, ev.YMin));
pc.Add(new EsriPoint(ev.XMax, ev.YMax));
pc.Add(new EsriPoint(ev.XMin, ev.YMax));
pc.Add(new EsriPoint(ev.XMin, ev.YMin));
ply.Rings.Add(pc);
AppendPolygonTaggedText(ply, writer);
}
else
{
throw new NotSupportedException("Unsupported Geometry implementation:" + geometry.GetType().Name);
}
}
private static void AppendPolygonText(EsriPolygon polygon, StringWriter writer)
{
if (polygon == null)
{
writer.Write("Empty");
}
else
{
writer.Write("(");
AppendLineStringText(polygon.Rings[0], writer);
for (int i = 1; i < polygon.Rings.Count; i++)
{
writer.Write(", ");
AppendLineStringText(polygon.Rings[i], writer);
}
writer.Write(")");
}
}
private static void AppendMultiPolygonText(EsriPolygon multiPolygon, StringWriter writer)
{
if (multiPolygon == null)
{
writer.Write("Empty");
}
else
{
writer.Write("(");
for (int i = 0; i < multiPolygon.Rings.Count; i++)
{
if (i > 0)
{
writer.Write(", ");
}
EsriPolygon pol = new EsriPolygon();
pol.Rings.Add(multiPolygon.Rings[i]);
AppendPolygonText(pol, writer);
}
writer.Write(")");
}
}
private static void AppendPolygonTaggedText(EsriPolygon polygon, StringWriter writer)
{
writer.Write("Polygon");
AppendPolygonText(polygon, writer);
}
private static void AppendMultiPolygonTaggedText(EsriPolygon multiPolygon, StringWriter writer)
{
writer.Write("MultiPolygon");
AppendMultiPolygonText(multiPolygon, writer);
}