Golang Geos.AsEwkbHex方法代碼示例

func AsGeomElement(g *geos.Geos, geom *geos.Geom) (Geometry, error) {
	wkb := g.AsEwkbHex(geom)
	if wkb == nil {
		return Geometry{}, errors.New("could not create wkb")
	}

	return Geometry{
		Wkb:  wkb,
		Geom: geom,
	}, nil
}

func (ww *WayWriter) buildAndInsert(g *geos.Geos, w *element.Way, matches []mapping.Match, isPolygon bool) error {
	var err error
	var geosgeom *geos.Geom
	// make copy to avoid interference with polygon/linestring matches
	way := element.Way(*w)

	if isPolygon {
		geosgeom, err = geomp.Polygon(g, way.Nodes)
		if err == nil {
			geosgeom, err = g.MakeValid(geosgeom)
		}
	} else {
		geosgeom, err = geomp.LineString(g, way.Nodes)
	}
	if err != nil {
		return err
	}

	geom, err := geomp.AsGeomElement(g, geosgeom)
	if err != nil {
		return err
	}

	if ww.limiter != nil {
		parts, err := ww.limiter.Clip(geom.Geom)
		if err != nil {
			return err
		}
		for _, p := range parts {
			way := element.Way(*w)
			geom = geomp.Geometry{Geom: p, Wkb: g.AsEwkbHex(p)}
			if isPolygon {
				if err := ww.inserter.InsertPolygon(way.OSMElem, geom, matches); err != nil {
					return err
				}
			} else {
				if err := ww.inserter.InsertLineString(way.OSMElem, geom, matches); err != nil {
					return err
				}
			}
		}
	} else {
		if isPolygon {
			if err := ww.inserter.InsertPolygon(way.OSMElem, geom, matches); err != nil {
				return err
			}
		} else {
			if err := ww.inserter.InsertLineString(way.OSMElem, geom, matches); err != nil {
				return err
			}
		}
	}
	return nil
}

func handleRelationMembers(rw *RelationWriter, r *element.Relation, geos *geosp.Geos) bool {
	relMemberMatches := rw.relationMemberMatcher.MatchRelation(r)
	if relMemberMatches == nil {
		return false
	}
	for i, m := range r.Members {
		if m.Type == element.RELATION {
			mrel, err := rw.osmCache.Relations.GetRelation(m.Id)
			if err != nil {
				if err != cache.NotFound {
					log.Warn(err)
				}
				return false
			}
			r.Members[i].Elem = &mrel.OSMElem
		} else if m.Type == element.NODE {
			nd, err := rw.osmCache.Nodes.GetNode(m.Id)
			if err != nil {
				if err == cache.NotFound {
					nd, err = rw.osmCache.Coords.GetCoord(m.Id)
					if err != nil {
						if err != cache.NotFound {
							log.Warn(err)
						}
						return false
					}
				} else {
					log.Warn(err)
					return false
				}
			}
			rw.NodeToSrid(nd)
			r.Members[i].Node = nd
			r.Members[i].Elem = &nd.OSMElem
		}
	}

	for _, m := range r.Members {
		var g *geosp.Geom
		var err error
		if m.Node != nil {
			g, err = geomp.Point(geos, *m.Node)
		} else if m.Way != nil {
			g, err = geomp.LineString(geos, m.Way.Nodes)
		}

		if err != nil {
			log.Warn(err)
			return false
		}

		var gelem geomp.Geometry
		if g == nil {
			g = geos.FromWkt("POLYGON EMPTY")
			gelem = geomp.Geometry{Geom: g, Wkb: geos.AsEwkbHex(g)}
		} else {
			gelem, err = geomp.AsGeomElement(geos, g)
			if err != nil {
				log.Warn(err)
				return false
			}
		}
		rel := element.Relation(*r)
		rel.Id = rw.relId(r.Id)
		rw.inserter.InsertRelationMember(rel, m, gelem, relMemberMatches)
	}
	return true
}

func handleMultiPolygon(rw *RelationWriter, r *element.Relation, geos *geosp.Geos) bool {
	// prepare relation first (build rings and compute actual
	// relation tags)
	prepedRel, err := geomp.PrepareRelation(r, rw.srid, rw.maxGap)
	if err != nil {
		if errl, ok := err.(ErrorLevel); !ok || errl.Level() > 0 {
			log.Warn(err)
		}
		return false
	}

	// check for matches befor building the geometry
	matches := rw.polygonMatcher.MatchRelation(r)
	if matches == nil {
		return false
	}

	// build the multipolygon
	geom, err := prepedRel.Build()
	if geom.Geom != nil {
		defer geos.Destroy(geom.Geom)
	}
	if err != nil {
		if errl, ok := err.(ErrorLevel); !ok || errl.Level() > 0 {
			log.Warn(err)
		}
		return false
	}

	if rw.limiter != nil {
		start := time.Now()
		parts, err := rw.limiter.Clip(geom.Geom)
		if err != nil {
			log.Warn(err)
			return false
		}
		if duration := time.Now().Sub(start); duration > time.Minute {
			log.Warnf("clipping relation %d to -limitto took %s", r.Id, duration)
		}
		for _, g := range parts {
			rel := element.Relation(*r)
			rel.Id = rw.relId(r.Id)
			geom = geomp.Geometry{Geom: g, Wkb: geos.AsEwkbHex(g)}
			err := rw.inserter.InsertPolygon(rel.OSMElem, geom, matches)
			if err != nil {
				if errl, ok := err.(ErrorLevel); !ok || errl.Level() > 0 {
					log.Warn(err)
				}
				continue
			}
		}
	} else {
		rel := element.Relation(*r)
		rel.Id = rw.relId(r.Id)
		err := rw.inserter.InsertPolygon(rel.OSMElem, geom, matches)
		if err != nil {
			if errl, ok := err.(ErrorLevel); !ok || errl.Level() > 0 {
				log.Warn(err)
			}
			return false
		}
	}

	for _, m := range mapping.SelectRelationPolygons(rw.polygonMatcher, r) {
		err = rw.osmCache.InsertedWays.PutWay(m.Way)
		if err != nil {
			log.Warn(err)
		}
	}
	return true
}