geom

package
v0.8.1 Latest Latest
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 Go to latest Published: Jun 13, 2019 License: Apache-2.0 Imports: 8 Imported by: 0

Documentation

Overview

Package geom provides functions for building geometries.

Index

Constants

This section is empty.

Variables

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

Functions

func LineString 

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

func NodesAsEWKBHexLineString 

func NodesAsEWKBHexLineString(nodes []osm.Node, srid int) ([]byte, error)

func NodesAsEWKBHexPolygon 

func NodesAsEWKBHexPolygon(nodes []osm.Node, srid int) ([]byte, error)

func Point 

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

func Polygon 

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

Types

type Geometry 

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

func AsGeomElement 

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

type GeometryError added in v0.7.0 

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

func (*GeometryError) Error added in v0.7.0 

func (e *GeometryError) Error() string

func (*GeometryError) Level added in v0.7.0 

func (e *GeometryError) Level() int

type PreparedRelation 

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

func PrepareRelation 

func PrepareRelation(rel *osm.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.

func (*PreparedRelation) Build 

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

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

Source Files

View all Source files

Directories

Path Synopsis
Package geojson creates GEOS geometries from GeoJSON files.
 Package geojson creates GEOS geometries from GeoJSON files.
Package geos provides a wrapper to the GEOS library.
 Package geos provides a wrapper to the GEOS library.
Package limit provides functions to clip geometries at polygon boundaries.
 Package limit provides functions to clip geometries at polygon boundaries.

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