GIS中复杂多边形的处理(例如孤岛、空心多边形)

对于ArcGIS中的复杂多边形处理起来有时候比较棘手，我们可以使用IPolygon4接口，遍历IPolygon当中多有的外环和内环

下面给出代码示例：

 public
void PolygonToRing(IPolygon4 polygon)
{
IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;
IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;
for (int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)
{
List<IPoint> PointResult = new List<IPoint>();
IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);
IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;
ReadPoints(exteriorRingPointCollection,PointResult);
CreateJson(PointResult);
IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);
IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;
for (int k = 0; k < interiorRingGeometryCollection.GeometryCount;k++ )
{
IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);
IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;
ReadPoints(interiorRingPointCollection, PointResult);
CreateJson(PointResult);
}
}
}
/// <summary>
/// 获取结果多边形节点坐标
/// </summary>
/// <param name="ptCol"节>点集合</param>
private void ReadPoints(IPointCollection ptCol, List<IPoint> PointResult)
{
IPoint pnt;
for (int i = 0; i < ptCol.PointCount; i++)
{
pnt = ptCol.get_Point(i);
PointResult.Add(pnt);
}
}

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