94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package locodedb
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import (
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"fmt"
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"strconv"
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locodecolumn "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/locode/column"
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)
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// Point represents a 2D geographic point.
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type Point struct {
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lat, lng float64
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}
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// NewPoint creates, initializes and returns a new Point.
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func NewPoint(lat, lng float64) *Point {
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return &Point{
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lat: lat,
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lng: lng,
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}
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}
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// Latitude returns the Point's latitude.
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func (p Point) Latitude() float64 {
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return p.lat
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}
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// Longitude returns the Point's longitude.
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func (p Point) Longitude() float64 {
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return p.lng
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}
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// PointFromCoordinates converts a UN/LOCODE coordinates to a Point.
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func PointFromCoordinates(crd *locodecolumn.Coordinates) (*Point, error) {
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if crd == nil {
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return nil, nil
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}
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cLat := crd.Latitude()
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cLatDeg := cLat.Degrees()
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cLatMnt := cLat.Minutes()
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lat, err := toDecimal(cLatDeg[:], cLatMnt[:])
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if err != nil {
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return nil, fmt.Errorf("could not parse latitude: %w", err)
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}
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if !cLat.Hemisphere().North() {
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lat = -lat
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}
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cLng := crd.Longitude()
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cLngDeg := cLng.Degrees()
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cLngMnt := cLng.Minutes()
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lng, err := toDecimal(cLngDeg[:], cLngMnt[:])
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if err != nil {
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return nil, fmt.Errorf("could not parse longitude: %w", err)
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}
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if !cLng.Hemisphere().East() {
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lng = -lng
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}
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return &Point{
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lat: lat,
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lng: lng,
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}, nil
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}
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func toDecimal(intRaw, minutesRaw []byte) (float64, error) {
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integer, err := strconv.ParseFloat(string(intRaw), 64)
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if err != nil {
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return 0, fmt.Errorf("could not parse integer part: %w", err)
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}
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decimal, err := minutesToDegrees(minutesRaw)
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if err != nil {
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return 0, fmt.Errorf("could not parse decimal part: %w", err)
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}
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return integer + decimal, nil
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}
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// minutesToDegrees converts minutes to decimal part of a degree.
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func minutesToDegrees(raw []byte) (float64, error) {
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minutes, err := strconv.ParseFloat(string(raw), 64)
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if err != nil {
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return 0, err
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}
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return minutes / 60, nil
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}
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