Class IsSimpleOp

java.lang.Object
org.locationtech.jts.operation.IsSimpleOp
public class IsSimpleOp extends Object
Deprecated.
Replaced by org.locationtech.jts.operation.valid.IsSimpleOp
Tests whether a Geometry is simple. In general, the SFS specification of simplicity follows the rule:
  • A Geometry is simple if and only if the only self-intersections are at boundary points.

Simplicity is defined for each Geometry type as follows:

  • Polygonal geometries are simple by definition, so isSimple trivially returns true. (Note: this means that isSimple cannot be used to test for (invalid) self-intersections in Polygons. In order to check if a Polygonal geometry has self-intersections, use Geometry.isValid()).
  • Linear geometries are simple if they do not self-intersect at interior points (i.e. points other than boundary points). This is equivalent to saying that no two linear components satisfy the SFS Geometry.touches(Geometry) predicate.
  • Zero-dimensional (point) geometries are simple if and only if they have no repeated points.
  • Empty geometries are always simple, by definition
For Lineal geometries the evaluation of simplicity can be customized by supplying a BoundaryNodeRule to define how boundary points are determined. The default is the SFS-standard BoundaryNodeRule.MOD2_BOUNDARY_RULE. Note that under the Mod-2 rule, closed LineStrings (rings) will never satisfy the touches predicate at their endpoints, since these are interior points, not boundary points. If it is required to test whether a set of LineStrings touch only at their endpoints, use IsSimpleOp with BoundaryNodeRule.ENDPOINT_BOUNDARY_RULE. For example, this can be used to validate that a set of lines form a topologically valid linear network.
Version:
1.7
See Also:

  • Constructor Details

    • IsSimpleOp

      public IsSimpleOp()
      Deprecated.
      use IsSimpleOp(Geometry)
      Creates a simplicity checker using the default SFS Mod-2 Boundary Node Rule

    • IsSimpleOp

      public IsSimpleOp(Geometry geom)
      Deprecated.
      Creates a simplicity checker using the default SFS Mod-2 Boundary Node Rule
      Parameters:
      geom - the geometry to test

    • IsSimpleOp

      public IsSimpleOp(Geometry geom, BoundaryNodeRule boundaryNodeRule)
      Deprecated.
      Creates a simplicity checker using a given BoundaryNodeRule
      Parameters:
      geom - the geometry to test
      boundaryNodeRule - the rule to use.

  • Method Details

    • isSimple

      public boolean isSimple()
      Deprecated.
      Tests whether the geometry is simple.
      Returns:
      true if the geometry is simple

    • getNonSimpleLocation

      public Coordinate getNonSimpleLocation()
      Deprecated.
      Gets a coordinate for the location where the geometry fails to be simple. (i.e. where it has a non-boundary self-intersection). isSimple() must be called before this method is called.
      Returns:
      a coordinate for the location of the non-boundary self-intersection or null if the geometry is simple

    • isSimple

      public boolean isSimple(LineString geom)
      Deprecated.
      use isSimple()
      Reports whether a LineString is simple.
      Parameters:
      geom - the lineal geometry to test
      Returns:
      true if the geometry is simple

    • isSimple

      public boolean isSimple(MultiLineString geom)
      Deprecated.
      use isSimple()
      Reports whether a MultiLineString geometry is simple.
      Parameters:
      geom - the lineal geometry to test
      Returns:
      true if the geometry is simple

    • isSimple

      public boolean isSimple(MultiPoint mp)
      Deprecated.
      use isSimple()
      A MultiPoint is simple if it has no repeated points