82d61d1f93
Animated GIFs are transcoded to AVC because it is much smaller and thus also suitable for long/large animations. In addition, this commit adds support for more metadata fields such as frame rate, number of frames, file capture timestamp (unix milliseconds), media type, and software version. Support for SVG files can later be implemented in a similar way.
100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
/*
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Package s2 encapsulates Google's S2 library.
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See https://s2geometry.io/
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Copyright (c) 2018 - 2022 PhotoPrism UG. All rights reserved.
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This program is free software: you can redistribute it and/or modify
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it under Version 3 of the GNU Affero General Public License (the "AGPL"):
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<https://docs.photoprism.app/license/agpl>
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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The AGPL is supplemented by our Trademark and Brand Guidelines,
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which describe how our Brand Assets may be used:
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<https://photoprism.app/trademark>
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Feel free to send an email to hello@photoprism.app if you have questions,
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want to support our work, or just want to say hello.
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Additional information can be found in our Developer Guide:
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<https://docs.photoprism.app/developer-guide/>
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*/
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package s2
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import (
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gs2 "github.com/golang/geo/s2"
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)
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// Default cell level, see https://s2geometry.io/resources/s2cell_statistics.html.
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var DefaultLevel = 21
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// Token returns the S2 cell token for coordinates using the default level.
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func Token(lat, lng float64) string {
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return TokenLevel(lat, lng, DefaultLevel)
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}
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// Token returns the S2 cell token for coordinates.
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func TokenLevel(lat, lng float64, level int) string {
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if lat == 0.0 && lng == 0.0 {
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return ""
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}
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if lat < -90 || lat > 90 {
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return ""
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}
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if lng < -180 || lng > 180 {
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return ""
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}
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l := gs2.LatLngFromDegrees(lat, lng)
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return gs2.CellIDFromLatLng(l).Parent(level).ToToken()
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}
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// LatLng returns the coordinates for a S2 cell token.
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func LatLng(token string) (lat, lng float64) {
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token = NormalizeToken(token)
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if len(token) < 3 {
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return 0.0, 0.0
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}
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c := gs2.CellIDFromToken(token)
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if !c.IsValid() {
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return 0.0, 0.0
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}
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l := c.LatLng()
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return l.Lat.Degrees(), l.Lng.Degrees()
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}
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// IsZero returns true if the coordinates are both empty.
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func IsZero(lat, lng float64) bool {
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return lat == 0.0 && lng == 0.0
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}
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// Range returns a token range for finding nearby locations.
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func Range(token string, levelUp int) (min, max string) {
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token = NormalizeToken(token)
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c := gs2.CellIDFromToken(token)
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if !c.IsValid() {
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return min, max
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}
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// See https://s2geometry.io/resources/s2cell_statistics.html
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lvl := c.Level()
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parent := c.Parent(lvl - levelUp)
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return parent.Prev().ChildBeginAtLevel(lvl).ToToken(), parent.Next().ChildBeginAtLevel(lvl).ToToken()
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}
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