geos::geom::util::GeometryFixer Class Reference

#include <GeometryFixer.h>

Public Member Functions
	GeometryFixer (const geom::Geometry *p_geom)
void	setKeepCollapsed (bool p_isKeepCollapsed)
std::unique_ptr< geom::Geometry >	getResult () const

Static Public Member Functions
static std::unique_ptr< geom::Geometry >	fix (const geom::Geometry *geom)

Detailed Description

Fixes a geometry to be a valid geometry, while preserving as much as possible of the shape and location of the input. Validity is determined according to Geometry#isValid().

Input geometries are always processed, so even valid inputs may have some minor alterations. The output is always a new geometry object.

Semantic Rules

• Vertices with non-finite X or Y ordinates are removed (as per Coordinate::isValid() ).
  • Repeated points are reduced to a single point
  • Empty atomic geometries are valid and are returned unchanged
  • Empty elements are removed from collections
  • Point: keep valid coordinate, or EMPTY
  • LineString: coordinates are fixed
  • LinearRing: coordinates are fixed, Keep valid ring or else convert into LineString
  • Polygon: transform into a valid polygon,
  • preserving as much of the extent and vertices as possible.
    • Rings are fixed to ensure they are valid<
    • Holes intersecting the shell are subtracted from the shell
    • Holes outside the shell are converted into polygons
  • MultiPolygon: each polygon is fixed, then result made non-overlapping (via union)
  • GeometryCollection: each element is fixed
  • Collapsed lines and polygons are handled as follows, depending on the keepCollapsed setting:
    • false: (default) collapses are converted to empty geometries
    • true: collapses are converted to a valid geometry of lower dimension

Author

Martin Davis

Member Function Documentation

getResult()

std::unique_ptr<geom::Geometry> geos::geom::util::GeometryFixer::getResult

(

)

const

Gets the fixed geometry.

Returns

the fixed geometry

setKeepCollapsed()

void geos::geom::util::GeometryFixer::setKeepCollapsed

(

bool

p_isKeepCollapsed

)

Sets whether collapsed geometries are converted to empty, (which will be removed from collections), or to a valid geom::Geometry of lower dimension. The default is to convert collapses to empty geometries.

Parameters

p_isKeepCollapsed

whether collapses should be converted to a lower dimension geometry

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The documentation for this class was generated from the following file:

• GeometryFixer.h