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141 lines
3.5 KiB
Go
141 lines
3.5 KiB
Go
package clean
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import (
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"fmt"
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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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// GPSBoundsDefaultPadding specifies the default padding of the GPS coordinates in meters.
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const GPSBoundsDefaultPadding = 5.0
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// GPSBounds parses the GPS bounds (Lat N, Lng E, Lat S, Lng W)
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// and returns the coordinates with default padding.
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func GPSBounds(bounds string) (latN, lngE, latS, lngW float64, err error) {
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return GPSBoundsWithPadding(bounds, GPSBoundsDefaultPadding)
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}
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// GPSBoundsWithPadding parses the GPS bounds (Lat N, Lng E, Lat S, Lng W)
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// and returns the coordinates with a custom padding in meters.
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func GPSBoundsWithPadding(bounds string, padding float64) (latN, lngE, latS, lngW float64, 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 bounding box string into coordinate values.
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values := strings.SplitN(bounds, ",", 5)
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found := len(values)
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// Return error if number of coordinates is invalid.
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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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// Convert coordinate strings to floating point values.
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latNorth, lngEast, latSouth, lngWest := txt.Float64(values[0]), txt.Float64(values[1]), txt.Float64(values[2]), txt.Float64(values[3])
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// Latitudes have a valid range of +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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// Make sure latSouth is smaller than latNorth.
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if latSouth > latNorth {
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latNorth, latSouth = latSouth, latNorth
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}
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// Longitudes have a valid range of -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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// Make sure lngWest is smaller than lngEast.
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if lngWest > lngEast {
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lngEast, lngWest = lngWest, lngEast
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}
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// Calculate the latitude and longitude padding in degrees.
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dLat, dLng := geo.Deg((latNorth+latSouth)/2.0, padding)
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// Return the coordinates of the bounding box with padding applied.
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return latNorth + dLat, lngEast + dLng, latSouth - dLat, lngWest - dLng, 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 float64, 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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dLat, _ := geo.DegKm(lat, r)
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latN = lat + dLat
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latS = lat - dLat
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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(lat, lng float64, km float64) (lngE, lngW float64, 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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_, dLng := geo.DegKm(lat, r)
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lngE = lng + dLng
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lngW = lng - dLng
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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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