geom

Documentation

Overview

Package geom provides functions for building geometries.

Index

• Variables
• func LineString(g *geos.Geos, nodes []element.Node) (*geos.Geom, error)
• func Point(g *geos.Geos, node element.Node) (*geos.Geom, error)
• func Polygon(g *geos.Geos, nodes []element.Node) (*geos.Geom, error)
• type GeomError
  • func (e *GeomError) Error() string
  • func (e *GeomError) Level() int
• type Geometry
  • func AsGeomElement(g *geos.Geos, geom *geos.Geom) (Geometry, error)
• type PreparedRelation
  • func PrepareRelation(rel *element.Relation, srid int, maxRingGap float64) (PreparedRelation, error)
  • func (prep *PreparedRelation) Build() (Geometry, error)

Variables

var (
	ErrorOneNodeWay = newGeomError("need at least two separate nodes for way", 0)
	ErrorNoRing     = newGeomError("linestrings do not form ring", 0)
)

Functions

func LineString

func LineString(g *geos.Geos, nodes []element.Node) (*geos.Geom, error)

func Point

func Point(g *geos.Geos, node element.Node) (*geos.Geom, error)

func Polygon

func Polygon(g *geos.Geos, nodes []element.Node) (*geos.Geom, error)

Types

type GeomError

type GeomError struct {
	// contains filtered or unexported fields
}

func (*GeomError) Error

func (e *GeomError) Error() string

func (*GeomError) Level

func (e *GeomError) Level() int

type Geometry

type Geometry struct {
	Geom *geos.Geom
	Wkb  []byte
}

func AsGeomElement

func AsGeomElement(g *geos.Geos, geom *geos.Geom) (Geometry, error)

type PreparedRelation

type PreparedRelation struct {
	// contains filtered or unexported fields
}

func PrepareRelation

func PrepareRelation(rel *element.Relation, srid int, maxRingGap float64) (PreparedRelation, error)

PrepareRelation is the first step in building a (multi-)polygon of a Relation. It builds rings from all ways and returns an error if there are unclosed rings. It also merges the Relation.Tags with the Tags of the outer way.

func (*PreparedRelation) Build

func (prep *PreparedRelation) Build() (Geometry, error)

Build creates the (multi)polygon Geometry of the Relation.