/// <summary>
/// Creates a new Feature that has a geometry that is the union between this feature and the specified feature.
/// This also copies the attributes that are shared between this featureset and the
/// specified destination featureset, and adds this feature to the destination featureset.
/// </summary>
/// <param name="self">This feature</param>
/// <param name="other">The other feature to compare to.</param>
/// <param name="destinationFeatureSet">The featureset to add the new feature to.</param>
/// <param name="joinType">Clarifies how the attributes should be handled during the union</param>
/// <returns>A new feature that is the geometric symmetric difference between this feature and the specified feature.</returns>
public static IFeature Union(this IFeature self, IFeature other, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
IFeature f = Union(self, other.Geometry);
if (f != null)
{
UpdateFields(self, other, f, destinationFeatureSet, joinType);
}
return(f);
}
/// <summary>
/// This tests each feature of the input
/// </summary>
/// <param name="self">This featureSet</param>
/// <param name="other">The featureSet to perform intersection with</param>
/// <param name="joinType">The attribute join type</param>
/// <param name="progHandler">A progress handler for status messages</param>
/// <returns>An IFeatureSet with the intersecting features, broken down based on the join Type</returns>
public static IFeatureSet Intersection(this IFeatureSet self, IFeatureSet other, FieldJoinType joinType, IProgressHandler progHandler)
{
IFeatureSet result = null;
ProgressMeter pm = new ProgressMeter(progHandler, "Calculating Intersection", self.Features.Count);
if (joinType == FieldJoinType.All)
{
result = CombinedFields(self, other);
// Intersection is symmetric, so only consider I X J where J <= I
if (!self.AttributesPopulated)
{
self.FillAttributes();
}
if (!other.AttributesPopulated)
{
other.FillAttributes();
}
for (int i = 0; i < self.Features.Count; i++)
{
IFeature selfFeature = self.Features[i];
List <IFeature> potentialOthers = other.Select(selfFeature.Geometry.EnvelopeInternal.ToExtent());
foreach (IFeature otherFeature in potentialOthers)
{
selfFeature.Intersection(otherFeature, result, joinType);
}
pm.CurrentValue = i;
}
pm.Reset();
}
else if (joinType == FieldJoinType.LocalOnly)
{
if (!self.AttributesPopulated)
{
self.FillAttributes();
}
result = new FeatureSet();
result.CopyTableSchema(self);
result.FeatureType = self.FeatureType;
if (other.Features != null && other.Features.Count > 0)
{
pm = new ProgressMeter(progHandler, "Calculating Union", other.Features.Count);
IFeature union = other.Features[0];
for (int i = 1; i < other.Features.Count; i++)
{
union = union.Union(other.Features[i].Geometry);
pm.CurrentValue = i;
}
pm.Reset();
pm = new ProgressMeter(progHandler, "Calculating Intersections", self.NumRows());
Extent otherEnvelope = union.Geometry.EnvelopeInternal.ToExtent();
for (int shp = 0; shp < self.ShapeIndices.Count; shp++)
{
if (!self.ShapeIndices[shp].Extent.Intersects(otherEnvelope))
{
continue;
}
IFeature selfFeature = self.GetFeature(shp);
selfFeature.Intersection(union, result, joinType);
pm.CurrentValue = shp;
}
pm.Reset();
}
}
else if (joinType == FieldJoinType.ForeignOnly)
{
if (!other.AttributesPopulated)
{
other.FillAttributes();
}
result = new FeatureSet();
result.CopyTableSchema(other);
result.FeatureType = other.FeatureType;
if (self.Features != null && self.Features.Count > 0)
{
pm = new ProgressMeter(progHandler, "Calculating Union", self.Features.Count);
IFeature union = self.Features[0];
for (int i = 1; i < self.Features.Count; i++)
{
union = union.Union(self.Features[i].Geometry);
pm.CurrentValue = i;
}
pm.Reset();
if (other.Features != null)
{
pm = new ProgressMeter(progHandler, "Calculating Intersection", other.Features.Count);
for (int i = 0; i < other.Features.Count; i++)
{
other.Features[i].Intersection(union, result, FieldJoinType.LocalOnly);
pm.CurrentValue = i;
}
}
pm.Reset();
}
}
return(result);
}
/// <summary>
/// This tests each feature of the input
/// </summary>
/// <param name="self">This featureSet</param>
/// <param name="other">The featureSet to perform intersection with</param>
/// <param name="joinType">The attribute join type</param>
/// <param name="progHandler">A progress handler for status messages</param>
/// <returns>An IFeatureSet with the intersecting features, broken down based on the join Type</returns>
public static IFeatureSet Intersection(this IFeatureSet self, IFeatureSet other, FieldJoinType joinType, IProgressHandler progHandler)
{
IFeatureSet result = null;
ProgressMeter pm = new ProgressMeter(progHandler, "Calculating Intersection", self.Features.Count);
if (joinType == FieldJoinType.All)
{
result = CombinedFields(self, other);
// Intersection is symmetric, so only consider I X J where J <= I
if (!self.AttributesPopulated) self.FillAttributes();
if (!other.AttributesPopulated) other.FillAttributes();
int i = 0;
foreach (IFeature selfFeature in self.Features)
{
List<IFeature> potentialOthers = other.Select(selfFeature.Envelope.ToExtent());
foreach (IFeature otherFeature in potentialOthers)
{
selfFeature.Intersection(otherFeature, result, joinType);
}
pm.CurrentValue = i;
i++;
}
pm.Reset();
}
if (joinType == FieldJoinType.LocalOnly)
{
if (!self.AttributesPopulated) self.FillAttributes();
result = new FeatureSet();
result.CopyTableSchema(self);
result.FeatureType = self.FeatureType;
IFeature union;
pm = new ProgressMeter(progHandler, "Calculating Union", other.Features.Count);
if (other.Features != null && other.Features.Count > 0)
{
union = other.Features[0];
for (int i = 1; i < other.Features.Count; i++)
{
union = union.Union(other.Features[i]);
pm.CurrentValue = i;
}
pm.Reset();
pm = new ProgressMeter(progHandler, "Calculating Intersections", self.NumRows());
Extent otherEnvelope = new Extent(union.Envelope);
for (int shp = 0; shp < self.ShapeIndices.Count; shp++)
{
if (!self.ShapeIndices[shp].Extent.Intersects(otherEnvelope)) continue;
IFeature selfFeature = self.GetFeature(shp);
selfFeature.Intersection(union, result, joinType);
pm.CurrentValue = shp;
}
pm.Reset();
}
}
if (joinType == FieldJoinType.ForeignOnly)
{
if (!other.AttributesPopulated) other.FillAttributes();
result = new FeatureSet();
result.CopyTableSchema(other);
IFeature union;
if (self.Features != null && self.Features.Count > 0)
{
pm = new ProgressMeter(progHandler, "Calculating Union", self.Features.Count);
union = self.Features[0];
for (int i = 1; i < self.Features.Count; i++)
{
union = union.Union(self.Features[i]);
pm.CurrentValue = i;
}
pm.Reset();
if (other.Features != null)
{
pm = new ProgressMeter(progHandler, "Calculating Intersection", other.Features.Count);
int j = 0;
foreach (IFeature otherFeature in other.Features)
{
IFeature test = otherFeature.Intersection(union, result, joinType);
if (test.BasicGeometry != null)
{
result.Features.Add(test);
}
pm.CurrentValue = j;
j++;
}
}
pm.Reset();
}
}
return result;
}
// This handles the slightly complex business of attribute outputs.
private static void UpdateFields(IFeature self, IFeature other, IFeature result, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
if (destinationFeatureSet.FeatureType != result.FeatureType)
{
return;
}
destinationFeatureSet.Features.Add(result);
if (joinType == FieldJoinType.None)
{
return;
}
if (joinType == FieldJoinType.All)
{
// This overly complex mess is concerned with preventing duplicate field names.
// This assumes that numbers were appended when duplicates occured, and will
// repeat the process here to establish one set of string names and values.
Dictionary <string, object> mappings = new Dictionary <string, object>();
foreach (DataColumn dc in self.ParentFeatureSet.DataTable.Columns)
{
string name = dc.ColumnName;
int i = 1;
while (mappings.ContainsKey(name))
{
name = dc.ColumnName + i;
i++;
}
mappings.Add(name, self.DataRow[dc.ColumnName]);
}
foreach (DataColumn dc in other.ParentFeatureSet.DataTable.Columns)
{
string name = dc.ColumnName;
int i = 1;
while (mappings.ContainsKey(name))
{
name = dc.ColumnName + i;
i++;
}
mappings.Add(name, other.DataRow[dc.ColumnName]);
}
foreach (KeyValuePair <string, object> pair in mappings)
{
if (!result.DataRow.Table.Columns.Contains(pair.Key))
{
result.DataRow.Table.Columns.Add(pair.Key);
}
result.DataRow[pair.Key] = pair.Value;
}
}
if (joinType == FieldJoinType.LocalOnly)
{
foreach (DataColumn dc in destinationFeatureSet.DataTable.Columns)
{
if (self.DataRow.Table.Columns.Contains(dc.ColumnName))
{
result.DataRow[dc.ColumnName] = self.DataRow[dc.ColumnName];
}
}
}
if (joinType == FieldJoinType.ForeignOnly)
{
foreach (DataColumn dc in destinationFeatureSet.DataTable.Columns)
{
if (other.DataRow[dc.ColumnName] != null)
{
result.DataRow[dc.ColumnName] = self.DataRow[dc.ColumnName];
}
}
}
}
/// <summary>
/// Creates a new Feature that has a geometry that is the union between this feature and the specified feature.
/// This also copies the attributes that are shared between this featureset and the
/// specified destination featureset, and adds this feature to the destination featureset.
/// </summary>
/// <param name="self">This feature</param>
/// <param name="other">The other feature to compare to.</param>
/// <param name="destinationFeatureSet">The featureset to add the new feature to.</param>
/// <param name="joinType">Clarifies how the attributes should be handled during the union</param>
/// <returns>A new feature that is the geometric symmetric difference between this feature and the specified feature.</returns>
public static IFeature Union(this IFeature self, IFeature other, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
IFeature f = Union(self, other);
if (f != null)
{
UpdateFields(self, other, f, destinationFeatureSet, joinType);
}
return f;
}
/// <summary>
/// Creates a new Feature that has a geometry that is the symmetric difference between this feature and the specified feature.
/// This also copies the attributes that are shared between this featureset and the
/// specified destination featureset, and adds this feature to the destination featureset.
/// </summary>
/// <param name="self">This feature</param>
/// <param name="other">The other feature to compare to.</param>
/// <param name="destinationFeatureSet">The featureset to add the new feature to.</param>
/// <param name="joinType">This clarifies the overall join strategy being used with regards to attribute fields.</param>
/// <returns>A new feature that is the geometric symmetric difference between this feature and the specified feature.</returns>
public static IFeature SymmetricDifference(this IFeature self, IFeature other, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
IFeature f = SymmetricDifference(self, other);
if (f != null)
{
UpdateFields(self, other, f, destinationFeatureSet, joinType);
}
return f;
}
// This handles the slightly complex business of attribute outputs.
private static void UpdateFields(IFeature self, IFeature other, IFeature result, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
if (destinationFeatureSet.FeatureType != result.FeatureType) return;
destinationFeatureSet.Features.Add(result);
if (joinType == FieldJoinType.None) return;
if (joinType == FieldJoinType.All)
{
// This overly complex mess is concerned with preventing duplicate field names.
// This assumes that numbers were appended when duplicates occured, and will
// repeat the process here to establish one set of string names and values.
Dictionary<string, object> mappings = new Dictionary<string, object>();
foreach (DataColumn dc in self.ParentFeatureSet.DataTable.Columns)
{
string name = dc.ColumnName;
int i = 1;
while (mappings.ContainsKey(name))
{
name = dc.ColumnName + i;
i++;
}
mappings.Add(name, self.DataRow[dc.ColumnName]);
}
foreach (DataColumn dc in other.ParentFeatureSet.DataTable.Columns)
{
string name = dc.ColumnName;
int i = 1;
while (mappings.ContainsKey(name))
{
name = dc.ColumnName + i;
i++;
}
mappings.Add(name, other.DataRow[dc.ColumnName]);
}
foreach (KeyValuePair<string, object> pair in mappings)
{
if (!result.DataRow.Table.Columns.Contains(pair.Key))
{
result.DataRow.Table.Columns.Add(pair.Key);
}
result.DataRow[pair.Key] = pair.Value;
}
}
if (joinType == FieldJoinType.LocalOnly)
{
foreach (DataColumn dc in destinationFeatureSet.DataTable.Columns)
{
if (self.DataRow.Table.Columns.Contains(dc.ColumnName))
{
result.DataRow[dc.ColumnName] = self.DataRow[dc.ColumnName];
}
}
}
if (joinType == FieldJoinType.ForeignOnly)
{
foreach (DataColumn dc in destinationFeatureSet.DataTable.Columns)
{
if (other.DataRow[dc.ColumnName] != null)
{
result.DataRow[dc.ColumnName] = self.DataRow[dc.ColumnName];
}
}
}
}
/// <summary>
/// Creates a new Feature that has a geometry that is the symmetric difference between this feature and the specified feature.
/// This also copies the attributes that are shared between this featureset and the
/// specified destination featureset, and adds this feature to the destination featureset.
/// </summary>
/// <param name="self">This feature</param>
/// <param name="other">The other feature to compare to.</param>
/// <param name="destinationFeatureSet">The featureset to add the new feature to.</param>
/// <param name="joinType">This clarifies the overall join strategy being used with regards to attribute fields.</param>
/// <returns>A new feature that is the geometric symmetric difference between this feature and the specified feature.</returns>
public static IFeature SymmetricDifference(this IFeature self, IFeature other, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
IFeature f = SymmetricDifference(self, other);
if (f != null)
{
UpdateFields(self, other, f, destinationFeatureSet, joinType);
}
return(f);
}
/// <summary>
/// Creates a new Feature that has a geometry that is the intersection between this feature and the specified feature.
/// This also copies the attributes that are shared between this featureset and the
/// specified destination featureset, and adds this feature to the destination featureset.
/// </summary>
/// <param name="self">This feature</param>
/// <param name="other">The other feature to compare to.</param>
/// <param name="destinationFeatureSet">The featureset to add the new feature to.</param>
/// <param name="joinType">This clarifies the overall join strategy being used with regards to attribute fields.</param>
/// <returns>A new feature that is the geometric intersection between this feature and the specified feature.</returns>
public static IFeature Intersection(this IFeature self, IFeature other, IFeatureSet destinationFeatureSet, FieldJoinType joinType)
{
IFeature f = Intersection(self, other);
if (f != null)
{
UpdateFields(self, other, f, destinationFeatureSet, joinType);
}
return(f);
}