mirror of https://github.com/tidwall/tile38.git
62 lines
1.2 KiB
Go
62 lines
1.2 KiB
Go
package geohash
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import (
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"math"
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"math/rand"
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)
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func RandomPoint() (lat, lng float64) {
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lat = -90 + 180*rand.Float64()
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lng = -180 + 360*rand.Float64()
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return
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}
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func RandomPoints(n int) [][2]float64 {
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points := make([][2]float64, n)
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for i := 0; i < n; i++ {
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lat, lng := RandomPoint()
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points[i] = [2]float64{lat, lng}
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}
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return points
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}
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func RandomBox() Box {
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lat1, lng1 := RandomPoint()
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lat2, lng2 := RandomPoint()
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return Box{
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MinLat: math.Min(lat1, lat2),
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MaxLat: math.Max(lat1, lat2),
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MinLng: math.Min(lng1, lng2),
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MaxLng: math.Max(lng1, lng2),
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}
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}
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func RandomStringGeohashWithPrecision(chars uint) string {
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const alphabet = "0123456789bcdefghjkmnpqrstuvwxyz"
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b := make([]byte, chars)
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for i := uint(0); i < chars; i++ {
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b[i] = alphabet[rand.Intn(32)]
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}
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return string(b)
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}
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func RandomStringGeohashesWithPrecision(n int, chars uint) []string {
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geohashes := make([]string, n)
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for i := 0; i < n; i++ {
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geohashes[i] = RandomStringGeohashWithPrecision(chars)
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}
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return geohashes
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}
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func RandomIntGeohash() uint64 {
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return (uint64(rand.Uint32()) << 32) | uint64(rand.Uint32())
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}
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func RandomIntGeohashes(n int) []uint64 {
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geohashes := make([]uint64, n)
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for i := 0; i < n; i++ {
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geohashes[i] = RandomIntGeohash()
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}
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return geohashes
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}
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