public virtual void OffsetPolygon_(double distance, com.epl.geometry.OperatorOffset.JoinType joins)
{
com.epl.geometry.Polygon polygon = new com.epl.geometry.Polygon();
polygon.StartPath(0, 0);
polygon.LineTo(0, 16);
polygon.LineTo(16, 16);
polygon.LineTo(16, 11);
polygon.LineTo(10, 10);
polygon.LineTo(10, 12);
polygon.LineTo(3, 12);
polygon.LineTo(3, 4);
polygon.LineTo(10, 4);
polygon.LineTo(10, 6);
polygon.LineTo(16, 5);
polygon.LineTo(16, 0);
com.epl.geometry.OperatorOffset offset = (com.epl.geometry.OperatorOffset)com.epl.geometry.OperatorFactoryLocal.GetInstance().GetOperator(com.epl.geometry.Operator.Type.Offset);
com.epl.geometry.Geometry outputGeom = offset.Execute(polygon, null, distance, joins, 2, 0, null);
NUnit.Framework.Assert.IsNotNull(outputGeom);
if (distance > 2)
{
NUnit.Framework.Assert.IsTrue(outputGeom.IsEmpty());
}
}
public override com.epl.geometry.Geometry Execute(com.epl.geometry.Geometry inputGeometry, com.epl.geometry.SpatialReference sr, double distance, com.epl.geometry.OperatorOffset.JoinType joins, double bevelRatio, double flattenError, com.epl.geometry.ProgressTracker progressTracker
)
{
com.epl.geometry.SimpleGeometryCursor inputCursor = new com.epl.geometry.SimpleGeometryCursor(inputGeometry);
com.epl.geometry.GeometryCursor outCursor = Execute(inputCursor, sr, distance, joins, bevelRatio, flattenError, progressTracker);
return(outCursor.Next());
}
public override com.epl.geometry.GeometryCursor Execute(com.epl.geometry.GeometryCursor inputGeometries, com.epl.geometry.SpatialReference sr, double distance, com.epl.geometry.OperatorOffset.JoinType joins, double bevelRatio, double flattenError, com.epl.geometry.ProgressTracker
progressTracker)
{
return(new com.epl.geometry.OperatorOffsetCursor(inputGeometries, sr, distance, joins, bevelRatio, flattenError, progressTracker));
}
internal OperatorOffsetCursor(com.epl.geometry.GeometryCursor inputGeometries, com.epl.geometry.SpatialReference sr, double distance, com.epl.geometry.OperatorOffset.JoinType joins, double bevelRatio, double flattenError, com.epl.geometry.ProgressTracker progressTracker)
{
m_index = -1;
m_inputGeoms = inputGeometries;
m_spatialReference = (com.epl.geometry.SpatialReferenceImpl)sr;
m_distance = distance;
m_joins = joins;
m_miterLimit = bevelRatio;
m_flattenError = flattenError;
m_progressTracker = progressTracker;
}
/// <summary>Creates offset version of the input geometries.</summary>
/// <remarks>
/// Creates offset version of the input geometries.
/// The offset operation creates a geometry that is a constant distance from
/// an input polyline or polygon. It is similar to buffering, but produces a
/// one sided result. If offsetDistance > 0, then the offset geometry is
/// constructed to the right of the oriented input geometry, otherwise it is
/// constructed to the left. For a simple polygon, the orientation of outer
/// rings is clockwise and for inner rings it is counter clockwise. So the
/// "right side" of a simple polygon is always its inside. The bevelRatio is
/// multiplied by the offset distance and the result determines how far a
/// mitered offset intersection can be from the input curve before it is
/// beveled.
/// </remarks>
/// <param name="inputGeometries">
/// The geometries to calculate offset for. Point and MultiPoint
/// are not supported.
/// </param>
/// <param name="sr">The SpatialReference of the Geometries.</param>
/// <param name="distance">The offset distance for the Geometries.</param>
/// <param name="joins">The join type of the offset geometry.</param>
/// <param name="bevelRatio">
/// The ratio used to produce a bevel join instead of a miter join
/// (used only when joins is Miter)
/// </param>
/// <param name="flattenError">
/// The maximum distance of the resulting segments compared to the
/// true circular arc (used only when joins is Round). If
/// flattenError is 0, tolerance value is used. Also, the
/// algorithm never produces more than around 180 vertices for
/// each round join.
/// </param>
/// <returns>Returns the result of the offset operation.</returns>
public abstract com.epl.geometry.GeometryCursor Execute(com.epl.geometry.GeometryCursor inputGeometries, com.epl.geometry.SpatialReference sr, double distance, com.epl.geometry.OperatorOffset.JoinType joins, double bevelRatio, double flattenError, com.epl.geometry.ProgressTracker
progressTracker);
