ArcGIS Engine 通过线构造面
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生成面之前的截图:
生成为面之后的截图:
从线生成面的方法代码:
/// <summary>
/// 通过线创建面
/// </summary>
/// <param name="pPolyline">线</param>
/// <returns>面</returns>
IPolygon ConstructPolygonFromPolyline(IPolyline pPolyline)
{
IGeometryCollection pPolygonGeoCol = new PolygonClass();
if ((pPolyline != null) && (!pPolyline.IsEmpty))
{
IGeometryCollection pPolylineGeoCol = pPolyline as IGeometryCollection;
ISegmentCollection pSegCol = new RingClass();
ISegment pSegment = null;
object missing = Type.Missing;
for (int i = 0; i < pPolylineGeoCol.GeometryCount; i++)
{
ISegmentCollection pPolylineSegCol = pPolylineGeoCol.get_Geometry(i) as ISegmentCollection;
for (int j = 0; j < pPolylineSegCol.SegmentCount; j++)
{
pSegment = pPolylineSegCol.get_Segment(j);
pSegCol.AddSegment(pSegment, ref missing, ref missing);
}
pPolygonGeoCol.AddGeometry(pSegCol as IGeometry, ref missing, ref missing);
}
}
return pPolygonGeoCol as IPolygon;
}
/// 通过线创建面
/// </summary>
/// <param name="pPolyline">线</param>
/// <returns>面</returns>
IPolygon ConstructPolygonFromPolyline(IPolyline pPolyline)
{
IGeometryCollection pPolygonGeoCol = new PolygonClass();
if ((pPolyline != null) && (!pPolyline.IsEmpty))
{
IGeometryCollection pPolylineGeoCol = pPolyline as IGeometryCollection;
ISegmentCollection pSegCol = new RingClass();
ISegment pSegment = null;
object missing = Type.Missing;
for (int i = 0; i < pPolylineGeoCol.GeometryCount; i++)
{
ISegmentCollection pPolylineSegCol = pPolylineGeoCol.get_Geometry(i) as ISegmentCollection;
for (int j = 0; j < pPolylineSegCol.SegmentCount; j++)
{
pSegment = pPolylineSegCol.get_Segment(j);
pSegCol.AddSegment(pSegment, ref missing, ref missing);
}
pPolygonGeoCol.AddGeometry(pSegCol as IGeometry, ref missing, ref missing);
}
}
return pPolygonGeoCol as IPolygon;
}
调用示例:
ILayer pLayer = axMapControl1.get_Layer(1);
IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
if (pFeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
{
IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
IFeature pFeature = pFeatureCursor.NextFeature();
ILayer pTargetLayer = axMapControl1.get_Layer(2);
IFeatureLayer pTargetFeatureLayer = pTargetLayer as IFeatureLayer;
IFeatureClass pTargetFeatureClass = pTargetFeatureLayer.FeatureClass;
if (pTargetFeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)
{
IPolygon pPolygon = null;
while (pFeature != null)
{
IPolyline pPolyline = pFeature.Shape as IPolyline;
pPolygon = ConstructPolygonFromPolyline(pPolyline);
if ((pPolygon != null) && (!pPolygon.IsEmpty))
{
if (!pPolygon.IsClosed)
{
pPolygon.Close();
}
IFeature pNewFeature = pTargetFeatureClass.CreateFeature();
pNewFeature.Shape = pPolygon;
pNewFeature.Store();
pFeature.Delete();
}
pFeature = pFeatureCursor.NextFeature();
}
}
}
axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
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