/// <summary>
/// 删除几何形状指定的顶点。
/// 顶点的会与几何形状的顶点进行IPoint::Compare比较，
/// 因此顶点必须是通过几何形状的顶点获取，才能成功删除。
/// 如果删除的结果导致几何形状为空，则几何形状接口不为空，只是setEmpty。
/// </summary>
/// <param name="geometry">需要删除顶点的ESRI几何形状接口</param>
/// <param name="point">指定要删除的顶点ESRI点接口</param>
/// <returns>是否成功删除</returns>
public static bool GeometryRemoveVertex(IGeometry geometry, IPoint point)
{
bool deleted = false;
if (IsValidGeometry(geometry) && IsValidGeometry(point))
{
switch (geometry.GeometryType)
{
case esriGeometryType.esriGeometryPoint:
#region 点几何形状
if (geometry is IPoint)
{
if ((geometry as IPoint).Compare(point) == 0)
{
geometry.SetEmpty();
deleted = true;
}
}
#endregion
break;
case esriGeometryType.esriGeometryMultipoint:
#region 多点几何形状
if (geometry is IPointCollection)
{
for (int i = 0; i <= (geometry as IPointCollection).PointCount - 1; i++)
{
if ((geometry as IPointCollection).get_Point(i).Compare(point) == 0)
{
(geometry as IPointCollection).RemovePoints(i, 1);
deleted = true;
break;
}
}
}
#endregion
break;
case esriGeometryType.esriGeometryPolyline:
#region 多义线几何形状
if (geometry is IPointCollection)
{
for (int i = 0; i <= (geometry as IPointCollection).PointCount - 1; i++)
{
if ((geometry as IPointCollection).get_Point(i).Compare(point) == 0)
{
(geometry as IPointCollection).RemovePoints(i, 1);
deleted = true;
break;
}
}
}
#endregion
break;
case esriGeometryType.esriGeometryPolygon:
#region 面几何形状
if (geometry is IGeometryCollection)
{
bool removed = false;
for (int i = 0; i <= (geometry as IGeometryCollection).GeometryCount - 1; i++)
{
IGeometry partGeom = (geometry as IGeometryCollection).get_Geometry(i);
if (IsValidGeometry(partGeom) && partGeom is IRing && partGeom is IPointCollection)
{
if ((partGeom as IRing).IsClosed)
{
#region 闭合的环（在编辑草图中存在）
if ((partGeom as IRing).FromPoint.Compare(point) == 0 ||
(partGeom as IRing).ToPoint.Compare(point) == 0)
{
if ((partGeom as IPointCollection).PointCount <= 2)
{
partGeom = null;
removed = true;
}
else
{
IPoint startPoint = (partGeom as IPointCollection).get_Point(1);
(partGeom as IPointCollection).RemovePoints(
(partGeom as IPointCollection).PointCount - 1, 1);
(partGeom as IPointCollection).RemovePoints(0, 1);
//(partGeom as IRing).FromPoint = startPoint;
(partGeom as IRing).Close();
removed = true;
}
}
else
{
for (int j = 0; j <= (partGeom as IPointCollection).PointCount - 1; j++)
{
if ((partGeom as IPointCollection).get_Point(j).Compare(point) == 0)
{
(partGeom as IPointCollection).RemovePoints(j, 1);
removed = true;
break;
}
}
}
#endregion
}
else
{
#region 非闭合的环（在编辑草图中应该不存在）
for (int j = 0; j <= (partGeom as IPointCollection).PointCount - 1; j++)
{
if ((partGeom as IPointCollection).get_Point(j).Compare(point) == 0)
{
(partGeom as IPointCollection).RemovePoints(j, 1);
removed = true;
break;
}
}
#endregion
}
}
if (removed)
{
(geometry as IGeometryCollection).RemoveGeometries(i, 1);
if (IsValidGeometry(partGeom))
{
IGeometryCollection geometryCollection = new Multipoint() as IGeometryCollection;
IGeometryBridge geometryBridge = new GeometryEnvironment() as IGeometryBridge;
IGeometry[] geometryArray = { partGeom };
geometryBridge.InsertGeometries((IGeometryCollection)geometry, i,
ref geometryArray);
}
deleted = true;
break;
}
}
}
#endregion
break;
default:
break;
}
}
return(deleted);
}
