private void btnConstructMultiPolygon_Click(object sender, EventArgs e)
{
if (gfactory == null)
gfactory = new GeometryFactory();
multiPolygon = gfactory.CreateGeometry(gviGeometryType.gviGeometryMultiPolygon, gviVertexAttribute.gviVertexAttributeZ) as IMultiPolygon;
if (multiPolygon == null)
return;
//添加第一个polygon
IPolygon polygonFirst = gfactory.CreateGeometry(gviGeometryType.gviGeometryPolygon, gviVertexAttribute.gviVertexAttributeZ) as IPolygon;
if (polygonFirst == null)
return;
/// 外环顺时针：1-4-3-2-1
/// 4-------3
/// | |
/// | |
/// 1-------2
IRing exteriorRing = polygonFirst.ExteriorRing;
point = gfactory.CreatePoint(gviVertexAttribute.gviVertexAttributeZ);
point.SetCoords(0, 0, 0, 0, 1);
exteriorRing.AppendPoint(point);
point.SetCoords(0, 200, 0, 0, 2);
exteriorRing.AppendPoint(point);
point.SetCoords(100, 200, 0, 0, 3);
exteriorRing.AppendPoint(point);
point.SetCoords(100, 0, 0, 0, 4);
exteriorRing.AppendPoint(point);
point.SetCoords(0, 0, 0, 0, 5);
exteriorRing.AppendPoint(point); //闭合
/// 内环逆时针：1-2-3-4-1
/// 4-------3
/// | |
/// | |
/// 1-------2
IRing interiorRing = gfactory.CreateGeometry(gviGeometryType.gviGeometryRing, gviVertexAttribute.gviVertexAttributeZ) as IRing;
point.SetCoords(25, 25, 0, 0, 1);
interiorRing.AppendPoint(point);
point.SetCoords(75, 25, 0, 0, 2);
interiorRing.AppendPoint(point);
point.SetCoords(75, 75, 0, 0, 3);
interiorRing.AppendPoint(point);
point.SetCoords(25, 75, 0, 0, 4);
interiorRing.AppendPoint(point);
point.SetCoords(25, 25, 0, 0, 5);
interiorRing.AppendPoint(point); //闭合
polygonFirst.AddInteriorRing(interiorRing);
//Clone一个新的内环
IRing pInteriorRingNew = interiorRing.Clone() as IRing;
polygonFirst.AddInteriorRing(pInteriorRingNew);
multiPolygon.AddPolygon(polygonFirst);
//Clone一个新的polygon
IPolygon pPolygonNew = polygonFirst.Clone() as IPolygon;
multiPolygon.AddPolygon(pPolygonNew);
MultiSurface geo = new MultiSurface();
// Geometry属性
geo.Dimension = multiPolygon.Dimension;
if (multiPolygon.Envelope != null)
{
geo.MaxX = multiPolygon.Envelope.MaxX;
geo.MaxY = multiPolygon.Envelope.MaxY;
geo.MaxZ = multiPolygon.Envelope.MaxZ;
geo.MinX = multiPolygon.Envelope.MinX;
geo.MinY = multiPolygon.Envelope.MinY;
geo.MinZ = multiPolygon.Envelope.MinZ;
}
geo.GeometryType = multiPolygon.GeometryType;
geo.IsEmpty = multiPolygon.IsEmpty;
geo.IsValid = multiPolygon.IsValid;
geo.VertexAttribute = multiPolygon.VertexAttribute;
geo.HasId = multiPolygon.HasId();
geo.HasM = multiPolygon.HasM();
geo.HasZ = multiPolygon.HasZ();
// GeometryCollection属性
geo.GeometryCount = multiPolygon.GeometryCount;
geo.IsOverlap = multiPolygon.IsOverlap;
// MultiSurface属性
geo.Area = multiPolygon.GetArea();
this.propertyGrid1.SelectedObject = geo;
}
