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location.go
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location.go
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package meteomatics
import (
"strconv"
"strings"
)
// A LocationString is a string representing a location.
type LocationString string
// A LocationStringer can be converted to a LocationString.
type LocationStringer interface {
LocationString() LocationString
}
// Location shortcuts.
const (
LocationWorld LocationString = "world"
LocationGlobal LocationString = "global"
LocationAfrica LocationString = "africa"
LocationAsia LocationString = "asia"
LocationAustralia LocationString = "australia"
LocationEurope LocationString = "europe"
LocationNorthAmerica LocationString = "north-america"
LocationSouthAmerica LocationString = "south-america"
)
// LocationString returns s as a LocationString.
func (s LocationString) LocationString() LocationString {
return s
}
// A Point is a point.
type Point struct {
Lat float64
Lon float64
}
// LocationString returns p as a LocationString.
func (p Point) LocationString() LocationString {
return formatFloat(p.Lat) + "," + formatFloat(p.Lon)
}
// A PointList is a list of Points.
type PointList []Point
// LocationString returns l as a LocationString.
func (l PointList) LocationString() LocationString {
ss := make([]string, len(l))
for i, p := range l {
ss[i] = string(p.LocationString())
}
return LocationString(strings.Join(ss, "+"))
}
// A Line is a line.
type Line struct {
Start Point
End Point
N int
}
// LocationString returns l as a LocationString.
func (l Line) LocationString() LocationString {
return l.Start.LocationString() +
"_" + l.End.LocationString() +
":" + formatInt(l.N)
}
// A PolylineSegment is a segment of a Polyline.
type PolylineSegment struct {
End Point
N int
}
// A Polyline is a polyline.
type Polyline struct {
Start Point
Segments []PolylineSegment
}
// LocationString returns p as a LocationString.
func (p Polyline) LocationString() LocationString {
b := strings.Builder{}
_, _ = b.WriteString(string(Line{
Start: p.Start,
End: p.Segments[0].End,
N: p.Segments[0].N,
}.LocationString()))
for i := 1; i < len(p.Segments); i++ {
s := p.Segments[i]
_, _ = b.WriteString(string("+" + s.End.LocationString() + ":" + formatInt(s.N)))
}
return LocationString(b.String())
}
// A RectangleN is a rectangle with a number of points.
type RectangleN struct {
Min Point
Max Point
NLon int
NLat int
}
// LocationString returns r as a LocationString.
func (r RectangleN) LocationString() LocationString {
return formatFloat(r.Max.Lat) + "," + formatFloat(r.Min.Lon) +
"_" + formatFloat(r.Min.Lat) + "," + formatFloat(r.Max.Lon) +
":" + formatInt(r.NLon) + "x" + formatInt(r.NLat)
}
// A RectangleRes is a rectangle with a resolution.
type RectangleRes struct {
Min Point
Max Point
ResLat float64
ResLon float64
}
// LocationString returns r as a LocationString.
func (r RectangleRes) LocationString() LocationString {
return formatFloat(r.Max.Lat) + "," + formatFloat(r.Min.Lon) +
"_" + formatFloat(r.Min.Lat) + "," + formatFloat(r.Max.Lon) +
":" + formatFloat(r.ResLat) + "," + formatFloat(r.ResLon)
}
// A Postal is a country code and a ZIP code.
type Postal struct {
CountryCode string
ZIPCode string
}
// LocationString returns p as a LocationString.
func (p Postal) LocationString() LocationString {
return LocationString("postal_" + p.CountryCode + p.ZIPCode)
}
// A LocationSlice is a slice of LocationStringers.
type LocationSlice []LocationStringer
// LocationString returns s as a LocationString.
func (s LocationSlice) LocationString() LocationString {
ss := make([]string, len(s))
for i, ls := range s {
ss[i] = string(ls.LocationString())
}
return LocationString(strings.Join(ss, "+"))
}
func formatFloat(x float64) LocationString {
return LocationString(strconv.FormatFloat(x, 'f', -1, 64))
}
func formatInt(i int) LocationString {
return LocationString(strconv.Itoa(i))
}