object InteriorPointArea

Computes a point in the interior of an areal geometry. The point will lie in the geometry interior in all except certain pathological cases.

Algorithm

For each input polygon:

  • Determine a horizontal scan line on which the interior point will be located. To increase the chance of the scan line having non-zero-width intersection with the polygon the scan line Y ordinate is chosen to be near the centre of the polygon's Y extent but distinct from all of vertex Y ordinates.
  • Compute the sections of the scan line which lie in the interior of the polygon.
  • Choose the widest interior section and take its midpoint as the interior point.

The final interior point is chosen as the one occurring in the widest interior section.

This algorithm is a tradeoff between performance and point quality (where points further from the geometry boundary are considered to be higher quality) Priority is given to performance. This means that the computed interior point may not be suitable for some uses (such as label positioning).

The algorithm handles some kinds of invalid/degenerate geometry, including zero-area and self-intersecting polygons.

Empty geometry is handled by returning a null point.

KNOWN BUGS
  • If a fixed precision model is used, in some cases this method may return a point which does not lie in the interior.
  • If the input polygon is extremely narrow the computed point may not lie in the interior of the polygon.
Version

1.17

Linear Supertypes
AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. InteriorPointArea
  2. AnyRef
  3. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  8. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  9. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  10. def getInteriorPoint(geom: Geometry): Coordinate

    Computes an interior point for the polygonal components of a Geometry.

    Computes an interior point for the polygonal components of a Geometry.

    geom

    the geometry to compute return the computed interior point, or null if the geometry has no polygonal components

  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  15. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  16. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  17. def toString(): String
    Definition Classes
    AnyRef → Any
  18. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  19. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  20. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from AnyRef

Inherited from Any

Ungrouped