Class: CommonBitsRemover

jsts.precision.CommonBitsRemover

new CommonBitsRemover()

Removes common most-significant mantissa bits from one or more Geometrys.

The CommonBitsRemover "scavenges" precision which is "wasted" by a large displacement of the geometry from the origin. For example, if a small geometry is displaced from the origin by a large distance, the displacement increases the significant figures in the coordinates, but does not affect the relative topology of the geometry. Thus the geometry can be translated back to the origin without affecting its topology. In order to compute the translation without affecting the full precision of the coordinate values, the translation is performed at the bit level by removing the common leading mantissa bits.

If the geometry envelope already contains the origin, the translation procedure cannot be applied. In this case, the common bits value is computed as zero.

If the geometry crosses the Y axis but not the X axis (and mutatis mutandum), the common bits for Y are zero, but the common bits for X are non-zero.

Version:
  • 1.7
Source:

Methods

add(geom)

Add a geometry to the set of geometries whose common bits are being computed. After this method has executed the common coordinate reflects the common bits of all added geometries.
Parameters:
Name Type Description
geom jsts.geom.Geometry a Geometry to test for common bits
Source:

addCommonBits(geom)

Adds the common coordinate bits back into a Geometry. The coordinates of the Geometry are changed.
Parameters:
Name Type Description
geom jsts.geom.Geometry the Geometry to which to add the common coordinate bits
Source:

getCommonCoordinate() → {jsts.geom.Coordinate}

The common bits of the Coordinates in the supplied Geometries.
Source:
Returns:
Type
jsts.geom.Coordinate

removeCommonBits(geom) → {jsts.geom.Geometry}

Removes the common coordinate bits from a Geometry. The coordinates of the Geometry are changed.
Parameters:
Name Type Description
geom jsts.geom.Geometry the Geometry from which to remove the common coordinate bits
Source:
Returns:
the shifted Geometry
Type
jsts.geom.Geometry