public void SplitByLatitude(double splitLat, out ShapePolygon lPly, out ShapePolygon rPly)
{
lPly = rPly = null;
List <ShapeRing> lRings = new List <ShapeRing>();
List <ShapeRing> rRings = new List <ShapeRing>();
foreach (ShapeRing ring in _rings)
{
ShapeRing lRing = null, rRing = null;
ring.SplitByLatitude(splitLat, out lRing, out rRing);
if (lRing != null)
{
lRings.Add(lRing);
}
if (rRing != null)
{
rRings.Add(rRing);
}
}
if (lRings.Count > 0)
{
lPly = new ShapePolygon(lRings.ToArray());
}
if (rRings.Count > 0)
{
rPly = new ShapePolygon(rRings.ToArray());
}
}
public void SplitByLatitude(double splitLat, out ShapeRing lRing, out ShapeRing rRing)
{
lRing = rRing = null;
List <ShapePoint> lPoints = new List <ShapePoint>();
List <ShapePoint> rPoints = new List <ShapePoint>();
foreach (ShapePoint pt in _points)
{
if (pt.Y > splitLat)
{
rPoints.Add(pt);
}
else
{
lPoints.Add(pt);
}
}
if (lPoints.Count > 2)
{
lRing = new ShapeRing(lPoints.ToArray());
}
if (rPoints.Count > 2)
{
rRing = new ShapeRing(rPoints.ToArray());
}
}
public override object Clone()
{
if (_rings == null || _rings.Length == 0)
{
return(null);
}
ShapeRing[] rings = new ShapeRing[_rings.Length];
for (int i = 0; i < rings.Length; i++)
{
rings[i] = _rings[i].Clone() as ShapeRing;
}
return(new ShapePolygon(rings));
}
public ShapePolygon ToPolygon()
{
ShapePoint[] pts = new ShapePoint[]
{
new ShapePoint(MinX, MaxY),
new ShapePoint(MaxX, MaxY),
new ShapePoint(MaxX, MinY),
new ShapePoint(MinX, MinY),
new ShapePoint(MinX, MaxY)
};
ShapeRing ring = new ShapeRing(pts);
return(new ShapePolygon(new ShapeRing[] { ring }));
}
private object ConstructPolygon(BinaryReader br, int oid)
{
Envelope evp = new Envelope(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
int nParts = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
int nPoints = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
int[] firstPoints = new int[nParts];
for (int i = 0; i < nParts; i++)
{
firstPoints[i] = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
}
ShapePoint[] pts = new ShapePoint[nPoints];
for (int i = 0; i < nPoints; i++)
{
pts[i] = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
}
//rings
ShapeRing[] rings = new ShapeRing[nParts];
for (int i = 0; i < nParts; i++)
{
int bIdx = firstPoints[i];
int eIdx = 0;
if (nParts == 1 || i == nParts - 1)
{
eIdx = nPoints;
}
else
{
eIdx = firstPoints[i + 1];
}
ShapePoint[] rpts = new ShapePoint[eIdx - bIdx];
for (int j = bIdx; j < eIdx; j++)
{
rpts[j - bIdx] = pts[j];
}
rings[i] = new ShapeRing(rpts);
}
//
ShapePolygon ply = new ShapePolygon(rings, evp);
Feature f = new Feature(oid, ply, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));
return(f);
}
private void ReadBaicProperties()
{
if (_dbConnection.State != ConnectionState.Open)
{
_dbConnection.Open();
}
string sql = "select id,datatable,annotable," + _adapter.SQLToWktForShapeField("envelope") + ",featurecount,shapetype from " + BudGISMetadata.cstFeatureClassTableName +
" t where datatable = '" + _fetclassName + "'";
using (IDbCommand cmd = _dbConnection.CreateCommand())
{
cmd.CommandText = sql;
using (IDataReader dr = cmd.ExecuteReader())
{
if (dr.Read())
{
_id = _adapter.DrToString(dr, 0);
_datatable = _adapter.DrToString(dr, 1);
_annotable = _adapter.DrToString(dr, 2);
//
ShapePolygon ply = _adapter.DrToShape(dr, 3) as ShapePolygon;
if (ply != null)
{
ShapeRing ring = ply.Rings[0];
_envelope = new Envelope(ring.Points[0].X, ring.Points[2].Y, ring.Points[1].X, ring.Points[0].Y);
}
//
_fetCount = _adapter.DrToInt32(dr, 4);
//
string shapeTypeStr = _adapter.DrToString(dr, 5);
foreach (enumShapeType st in Enum.GetValues(typeof(enumShapeType)))
{
if (st.ToString() == shapeTypeStr.ToString())
{
_shapeType = st;
break;
}
}
//
}
else
{
throw new Exception("要素类\"" + _fetclassName + "\"在指定的空间数据库中不存在。");
}
}
}
}
public override string ToWkt()
{
if (_rings == null || _rings.Length == 0)
{
return(null);
}
StringBuilder sb = new StringBuilder();
sb.Append("POLYGON(");
for (int i = 0; i < _rings.Length; i++)
{
ShapeRing ring = _rings[i];
if (ring.Points == null || ring.Points.Length == 0)
{
continue;
}
sb.Append("(");
for (int j = 0; j < ring.Points.Length; j++)
{
ShapePoint pt = ring.Points[j];
sb.Append(pt.X.ToString());
sb.Append(" ");
sb.Append(pt.Y.ToString());
if (j != ring.Points.Length - 1)
{
sb.Append(",");
}
}
sb.Append(")");
if (i != _rings.Length - 1)
{
sb.Append(",");
}
}
sb.Append(")");
return(sb.ToString());
}