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());
}
}
/// <summary>
/// 使用斜率截距快速算法
/// 以全球国家为例：220毫秒
/// </summary>
/// <param name="ply"></param>
private unsafe void PolygonToPath(ShapePolygon ply)
{
float kLon = _quickTransformArgs.kLon;
float kLat = _quickTransformArgs.kLat;
float bLon = _quickTransformArgs.bLon;
float bLat = _quickTransformArgs.bLat;
int ringCount = ply.Rings.Length;
for (int ri = 0; ri < ringCount; ri++)
{
ShapePoint[] prjPts = ply.Rings[ri].Points;
int nCount = prjPts.Length;
PointF[] pts = new PointF[nCount];
fixed(PointF *ptr0 = pts)
{
PointF *ptr = ptr0;
for (int i = 0; i < nCount; i++, ptr++)
{
ptr->X = (float)(kLon * prjPts[i].X + bLon);
ptr->Y = (float)(kLat * prjPts[i].Y + bLat);
}
}
_path.AddPolygon(pts);
}
}
public static bool IsPointInPolygon(ShapePoint hitPoint, ShapePolygon polygon)
{
int n = 0;
foreach (ShapeRing ring in polygon.Rings)
{
n += ComputeCrossPointCount(hitPoint, ring.Points);
}
return(!(n % 2 == 0));
}
private void TryHandleLongitudeRange(Feature feature)
{
if (feature.Geometry is ShapePolygon)
{
ShapePolygon ply = feature.Geometry as ShapePolygon;
foreach (ShapeRing ring in ply.Rings)
{
foreach (ShapePoint pt in ring.Points)
{
if (pt.X > _maxLon)
{
pt.X = _maxLon;
}
else if (pt.X < _minLon)
{
pt.X = _minLon;
}
}
}
}
else if (feature.Geometry is ShapePolyline)
{
ShapePolyline pline = feature.Geometry as ShapePolyline;
foreach (ShapeLineString part in pline.Parts)
{
foreach (ShapePoint pt in part.Points)
{
if (pt.X > _maxLon)
{
pt.X = _maxLon;
}
else if (pt.X < _minLon)
{
pt.X = _minLon;
}
}
}
}
else if (feature.Geometry is ShapePoint)
{
ShapePoint pt = feature.Geometry as ShapePoint;
if (pt.X > _maxLon)
{
pt.X = _maxLon;
}
else if (pt.X < _minLon)
{
pt.X = _minLon;
}
}
}
public void SplitByLongitude(double splitLon, out Feature lfet, out Feature rfet)
{
lfet = null;
rfet = null;
if (_geometry is ShapePoint)
{
ShapePoint pt = _geometry as ShapePoint;
lfet = Clone() as Feature;
lfet.Geometry = new ShapePoint(pt.X, pt.Y);
rfet = null;
}
else if (_geometry is ShapePolyline)
{
ShapePolyline lLine = null, rLine = null;
(_geometry as ShapePolyline).SplitByLongitude(splitLon, out lLine, out rLine);
if (lLine != null)
{
lfet = Clone() as Feature;
lfet.Geometry = lLine;
}
//
if (rLine != null)
{
rfet = Clone() as Feature;
rfet.Geometry = rLine;
}
}
else if (_geometry is ShapePolygon)
{
ShapePolygon lPly = null, rPly = null;
(_geometry as ShapePolygon).SplitByLongitude(splitLon, out lPly, out rPly);
if (lPly != null)
{
lfet = Clone() as Feature;
lfet.Geometry = lPly;
}
//
if (rPly != null)
{
rfet = Clone() as Feature;
rfet.Geometry = rPly;
}
}
else
{
throw new NotSupportedException("矢量要素分割操作不支持请求的几何类型。");
}
}
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。");
}
}
}
}
private Int32 CalculateMainfileLengthInByte(Feature[] vf)
{
Int32 TmpLength = 0;
if (vf[0].Geometry is ShapePoint)
{
TmpLength += 28 * vf.Length;
}
else if (vf[0].Geometry is ShapeMultiPoint)
{
foreach (Feature tvf in vf)
{
TmpLength += 48 + (tvf.Geometry as ShapeMultiPoint).Points.Length * 16;
}
}
else if (vf[0].Geometry is ShapePolyline)
{
//points?
ShapePolyline polyLine = null;
foreach (Feature tvf in vf)
{
polyLine = tvf.Geometry as ShapePolyline;
TmpLength += 52 + polyLine.Parts.Length * 4;
foreach (ShapeLineString pt in polyLine.Parts)
{
TmpLength += pt.Points.Length * 16;
}
}
}
else if (vf[0].Geometry is ShapePolygon)
{
ShapePolygon polygon = null;
foreach (Feature tvf in vf)
{
polygon = tvf.Geometry as ShapePolygon;
TmpLength += 52 + polygon.Rings.Length * 4;
foreach (ShapeRing sr in polygon.Rings)
{
TmpLength += sr.Points.Length * 16;
}
}
}
_currentShpRecondLength += TmpLength;
return(_currentShpRecondLength + 100);
}
private bool HitTestByPolygon(ShapePolygon shapePolygon)
{
if (this is ShapePoint)
{
return(shapePolygon.Contains(this as ShapePoint));
}
else if (this is ShapePolyline)
{
return(shapePolygon.Contains(this as ShapePolyline));
}
else if (this is ShapePolygon)
{
return(shapePolygon.Contains(this as ShapePolygon));
}
else
{
throw new NotSupportedException("暂不支持对\"" + this.GetType().ToString() + "\"进行点击测试。");
}
}
public override bool Contains(Shape geometry)
{
if (!Envelope.Contains(geometry.Envelope))
{
return(false);
}
if (geometry is ShapePoint)
{
return(GeometryMathLib.IsPointInPolygon(geometry as ShapePoint, this));
}
else if (geometry is ShapePolyline)
{
ShapePolyline line = geometry as ShapePolyline;
foreach (ShapeLineString part in line.Parts)
{
foreach (ShapePoint pt in part.Points)
{
if (!GeometryMathLib.IsPointInPolygon(pt, this))
{
return(false);
}
}
}
return(true);
}
else if (geometry is ShapePolygon)
{
ShapePolygon ply = geometry as ShapePolygon;
foreach (ShapeRing ring in ply.Rings)
{
foreach (ShapePoint pt in ring.Points)
{
if (!GeometryMathLib.IsPointInPolygon(pt, this))
{
return(false);
}
}
}
return(true);
}
return(false);
}
public static Shape FromWKT(string wkt)
{
if (wkt == null)
{
return(null);
}
if (wkt.Contains("MULTIPOINT") || wkt.Contains("POINT"))
{
return(ShapePoint.FromWKT(wkt));
}
else if (wkt.Contains("MULTILINESTRING") || wkt.Contains("LINESTRING"))
{
return(ShapePolyline.FromWKT(wkt));
}
else if (wkt.Contains("MULTIPOLYGON") || wkt.Contains("POLYGON"))
{
return(ShapePolygon.FromWKT(wkt));
}
else
{
throw new NotSupportedException("不支持的几何类型或者错误的OGC WKT表达式," + wkt + "。");
}
}
public void TryProject(IGrid grid)
{
if (_currentRuntimeProjecter == null)
{
return;
}
//
if (!grid.CoordIsConverted)
{
_currentRuntimeProjecter.Project(grid.GridEnvelope);
grid.CoordIsConverted = true;
}
//
if (grid.VectorFeatures == null || grid.VectorFeatures.Count == 0)
{
return;
}
Shape shape = null;
Feature[] fets = grid.VectorFeatures.ToArray();
int n = fets.Length;
Feature fet = null;
for (int i = 0; i < n; i++)
{
fet = fets[i];
//
fet.SetFeatureClass(this);
//
if (fet.Projected)
{
continue;
}
//annotations
if (fet.Annotations != null)
{
foreach (LabelLocation loc in fet.Annotations)
{
_currentRuntimeProjecter.Project(loc.Location);
}
}
//
Envelope newEnvelope = new Envelope(double.MaxValue, double.MaxValue, double.MinValue, double.MinValue);
shape = fet.Geometry;
if (shape == null || shape.IsProjected)
{
continue;
}
shape.IsProjected = true;
shape.Envelope = newEnvelope;
if (shape is ShapePoint)
{
_currentRuntimeProjecter.Project(shape as ShapePoint);
UpdateEnvelopeByPoints(newEnvelope, new ShapePoint[] { shape as ShapePoint });
shape.UpdateCentroid();
}
else if (shape is ShapePolyline)
{
ShapePolyline line = shape as ShapePolyline;
foreach (ShapeLineString part in line.Parts)
{
_currentRuntimeProjecter.Project(part.Points);
UpdateEnvelopeByPoints(newEnvelope, part.Points);
}
line.UpdateCentroid();
}
else if (shape is ShapePolygon)
{
ShapePolygon ply = shape as ShapePolygon;
foreach (ShapeRing ring in ply.Rings)
{
_currentRuntimeProjecter.Project(ring.Points);
UpdateEnvelopeByPoints(newEnvelope, ring.Points);
}
ply.UpdateCentroid();
}
if (fet.LabelLocationService == null)
{
fet.SetLabelLocationService(new LabelLocationServiceDefault(null));
}
fet.LabelLocationService.Update(fet.Geometry);
fet.Projected = true;
}
(grid as Grid).UpdateEnvelope();
}