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f5aaeb712e
Derived from Dgraph (github.com/dgraph-io/dgraph) at commit 64804bd2, Apache-2.0. See NOTICE. WHAT THIS IS. The graph engine as a Go library: posting lists, the DQL parser, the type and tokenizer system, the index and schema layers, and the wire types. 39,170 lines of the upstream's 166,337. THE STORE is github.com/luxfi/zapdb, a Badger fork that kept the package name, the subpackages (options, pb, y) and the API — Open, OpenManaged, DB, Options — so the 74 import sites are aliased rather than rewritten. THE CODEC is ZAP. zapdb serializes with ZAP, not protobuf: its pb package builds the ZAP types by default and the protobuf ones only under `-tags grpc`, a path that does not compile (table/builder.go calls pb.Marshal, which that tag removes). One call site in posting needed converting; every other type here is Hanzo's own protobuf and is untouched. NO TRANSPORT. An embedded engine dials nothing, so nothing here imports google.golang.org/grpc. Removed: 20 transport functions in x, the generated service stubs for Raft, Zero and Worker (1,657 lines), and the JWT helper — identity belongs to IAM. The core called none of them. NOT KEPT: worker, conn, raftwal, the cluster commands, the GraphQL layer and the test harnesses. `query`, the DQL execution engine, went with them because it depends on worker; parsing DQL is available here, executing it is not. The history of the upstream project lives at github.com/dgraph-io/dgraph. This repository begins at the derivation because three quarters of that history describes code this fork does not carry.
64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
/*
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* SPDX-FileCopyrightText: © 2017-2026 Istari Digital, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package types
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import (
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"fmt"
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"github.com/golang/geo/s1"
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)
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// Helper functions for earth distances
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// EarthRadiusMeters is the radius of the earth in meters (in a spherical earth model).
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const EarthRadiusMeters = 1000 * 6371
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// Length denotes a length on Earth
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type Length float64
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// EarthDistance converts an angle to distance on earth in meters.
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func EarthDistance(angle s1.Angle) Length {
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return Length(angle.Radians() * EarthRadiusMeters)
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}
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// EarthAngle converts a to distance on earth in meters to an angle
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func EarthAngle(dist float64) s1.Angle {
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return s1.Angle(dist / EarthRadiusMeters)
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}
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// Area denotes an area on Earth
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type Area float64
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// EarthArea converts an area on the unit sphere to an area on earth in sq. meters.
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func EarthArea(a float64) Area {
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return Area(a * EarthRadiusMeters * EarthRadiusMeters)
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}
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// String converts the length to human readable units
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func (l Length) String() string {
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switch {
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case l > 1000:
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return fmt.Sprintf("%.3f km", l/1000)
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case l < 1:
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return fmt.Sprintf("%.3f cm", l*100)
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}
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return fmt.Sprintf("%.3f m", l)
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}
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const km2 = 1000 * 1000
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const cm2 = 100 * 100
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// String converts the area to human readable units
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func (a Area) String() string {
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switch {
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case a > km2:
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return fmt.Sprintf("%.3f km^2", a/km2)
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case a < 1:
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return fmt.Sprintf("%.3f cm^2", a*cm2)
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}
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return fmt.Sprintf("%.3f m^2", a)
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}
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