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topology_operations.go
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/
topology_operations.go
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// Copyright 2020 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.
package geomfn
import (
"github.com/ruiaylin/pgparser/types/geo"
"github.com/ruiaylin/pgparser/types/geo/geos"
)
// Centroid returns the Centroid of a given Geometry.
func Centroid(g *geo.Geometry) (*geo.Geometry, error) {
centroidEWKB, err := geos.Centroid(g.EWKB())
if err != nil {
return nil, err
}
return geo.ParseGeometryFromEWKB(centroidEWKB)
}
// ConvexHull returns the convex hull of a given Geometry.
func ConvexHull(g *geo.Geometry) (*geo.Geometry, error) {
convexHullEWKB, err := geos.ConvexHull(g.EWKB())
if err != nil {
return nil, err
}
return geo.ParseGeometryFromEWKB(convexHullEWKB)
}
// PointOnSurface returns the PointOnSurface of a given Geometry.
func PointOnSurface(g *geo.Geometry) (*geo.Geometry, error) {
pointOnSurfaceEWKB, err := geos.PointOnSurface(g.EWKB())
if err != nil {
return nil, err
}
return geo.ParseGeometryFromEWKB(pointOnSurfaceEWKB)
}
// Intersection returns the geometries of intersection between A and B.
func Intersection(a *geo.Geometry, b *geo.Geometry) (*geo.Geometry, error) {
if a.SRID() != b.SRID() {
return nil, geo.NewMismatchingSRIDsError(a, b)
}
retEWKB, err := geos.Intersection(a.EWKB(), b.EWKB())
if err != nil {
return nil, err
}
return geo.ParseGeometryFromEWKB(retEWKB)
}
// Union returns the geometries of intersection between A and B.
func Union(a *geo.Geometry, b *geo.Geometry) (*geo.Geometry, error) {
if a.SRID() != b.SRID() {
return nil, geo.NewMismatchingSRIDsError(a, b)
}
retEWKB, err := geos.Union(a.EWKB(), b.EWKB())
if err != nil {
return nil, err
}
return geo.ParseGeometryFromEWKB(retEWKB)
}