135 lines
3.2 KiB
Go
135 lines
3.2 KiB
Go
package clean
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import (
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"fmt"
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"math"
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"strings"
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"github.com/photoprism/photoprism/pkg/geo"
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"github.com/photoprism/photoprism/pkg/txt"
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)
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// gpsCeil converts a GPS coordinate to a rounded float32 for use in queries.
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func gpsCeil(f float64) float32 {
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return float32((math.Ceil(f*10000) / 10000) + 0.0001)
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}
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// gpsFloor converts a GPS coordinate to a rounded float32 for use in queries.
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func gpsFloor(f float64) float32 {
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return float32((math.Floor(f*10000) / 10000) - 0.0001)
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}
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// GPSBounds parses the GPS bounds (Lat N, Lng E, Lat S, Lng W) and returns the coordinates if any.
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func GPSBounds(bounds string) (latN, lngE, latS, lngW float32, err error) {
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// Bounds string not long enough?
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if len(bounds) < 7 {
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return 0, 0, 0, 0, fmt.Errorf("no coordinates found")
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}
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// Trim whitespace and invalid characters.
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bounds = strings.Trim(bounds, " |\\<>\n\r\t\"'#$%!^*()[]{}")
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// Split string into values.
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values := strings.SplitN(bounds, ",", 5)
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found := len(values)
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// Invalid number of values?
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if found != 4 {
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return 0, 0, 0, 0, fmt.Errorf("invalid number of coordinates")
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}
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// Parse floating point coordinates.
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latNorth, lngEast, latSouth, lngWest := txt.Float(values[0]), txt.Float(values[1]), txt.Float(values[2]), txt.Float(values[3])
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// Latitudes (from +90 to -90 degrees).
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if latNorth > 90 {
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latNorth = 90
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} else if latNorth < -90 {
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latNorth = -90
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}
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if latSouth > 90 {
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latSouth = 90
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} else if latSouth < -90 {
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latSouth = -90
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}
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// latSouth must be smaller.
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if latSouth > latNorth {
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latNorth, latSouth = latSouth, latNorth
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}
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// Longitudes (from -180 to +180 degrees).
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if lngEast > 180 {
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lngEast = 180
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} else if lngEast < -180 {
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lngEast = -180
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}
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if lngWest > 180 {
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lngWest = 180
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} else if lngWest < -180 {
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lngWest = -180
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}
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// lngWest must be smaller.
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if lngWest > lngEast {
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lngEast, lngWest = lngWest, lngEast
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}
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// Return rounded coordinates.
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return gpsCeil(latNorth), gpsCeil(lngEast), gpsFloor(latSouth), gpsFloor(lngWest), nil
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}
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// GPSLatRange returns a range based on the specified latitude and distance in km, or an error otherwise.
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func GPSLatRange(lat float64, km float64) (latN, latS float32, err error) {
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// Latitude (from +90 to -90 degrees).
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if lat == 0 || lat < -90 || lat > 90 {
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return 0, 0, fmt.Errorf("invalid latitude")
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}
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// Approximate range radius.
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r := km * 0.75
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// Approximate longitude range,
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// see https://en.wikipedia.org/wiki/Decimal_degrees
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latN = gpsCeil(lat + geo.Deg(r))
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latS = gpsFloor(lat - geo.Deg(r))
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if latN > 90 {
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latN = 90
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}
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if latS < -90 {
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latS = -90
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}
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return latN, latS, nil
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}
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// GPSLngRange returns a range based on the specified longitude and distance in km, or an error otherwise.
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func GPSLngRange(lng float64, km float64) (lngE, lngW float32, err error) {
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// Longitude (from -180 to +180 degrees).
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if lng == 0 || lng < -180 || lng > 180 {
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return 0, 0, fmt.Errorf("invalid longitude")
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}
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// Approximate range radius.
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r := km * 0.75
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// Approximate longitude range,
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// see https://en.wikipedia.org/wiki/Decimal_degrees
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lngE = gpsCeil(lng + geo.Deg(r))
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lngW = gpsFloor(lng - geo.Deg(r))
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if lngE > 180 {
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lngE = 180
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}
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if lngW < -180 {
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lngW = -180
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}
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return lngE, lngW, nil
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}
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