81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
/*
|
|
Package pluscode provides an abstraction for Google's Open Location Code package.
|
|
|
|
Copyright (c) 2018 - 2024 PhotoPrism UG. All rights reserved.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under Version 3 of the GNU Affero General Public License (the "AGPL"):
|
|
<https://docs.photoprism.app/license/agpl>
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
The AGPL is supplemented by our Trademark and Brand Guidelines,
|
|
which describe how our Brand Assets may be used:
|
|
<https://www.photoprism.app/trademark>
|
|
|
|
Feel free to send an email to hello@photoprism.app if you have questions,
|
|
want to support our work, or just want to say hello.
|
|
|
|
Additional information can be found in our Developer Guide:
|
|
<https://docs.photoprism.app/developer-guide/>
|
|
*/
|
|
package pluscode
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
olc "github.com/google/open-location-code/go"
|
|
"github.com/photoprism/photoprism/pkg/s2"
|
|
)
|
|
|
|
var defaultLen = 8
|
|
|
|
// Encode returns the plus code for the given coordinates using the default length.
|
|
func Encode(lat, lng float64) string {
|
|
result, _ := EncodeLength(lat, lng, defaultLen)
|
|
|
|
return result
|
|
}
|
|
|
|
// EncodeLength returns the plus code for the given coordinates.
|
|
func EncodeLength(lat, lng float64, length int) (plusCode string, err error) {
|
|
if lat < -90 || lat > 90 {
|
|
return "", fmt.Errorf("latitude out of range (%f)", lat)
|
|
}
|
|
|
|
if lng < -180 || lng > 180 {
|
|
return "", fmt.Errorf("longitude out of range (%f)", lng)
|
|
}
|
|
|
|
return olc.Encode(lat, lng, length), nil
|
|
}
|
|
|
|
// LatLng returns the coordinates for a plus code token.
|
|
func LatLng(token string) (lat, lng float64) {
|
|
if token == "" || token == "-" {
|
|
return lat, lng
|
|
}
|
|
|
|
c, err := olc.Decode(token)
|
|
|
|
if err != nil {
|
|
return lat, lng
|
|
}
|
|
|
|
lat, lng = c.Center()
|
|
|
|
return lat, lng
|
|
}
|
|
|
|
// S2 returns the S2 cell token for the plus code using the default cell level.
|
|
func S2(plusCode string) string {
|
|
lat, lng := LatLng(plusCode)
|
|
|
|
s2Token := s2.Token(lat, lng)
|
|
|
|
return s2Token
|
|
}
|