- ebai store.

business/jxutils/jxutils_cms.go

@@ -2,6 +2,7 @@ package jxutils
 
 import (
 	"fmt"
+	"math"
 	"strings"
 	"time"
 
@@ -64,3 +65,28 @@ func StrTime2JxOperationTime(strTime string, defValue int16) int16 {
 func JxOperationTime2StrTime(value int16) string {
 	return fmt.Sprintf("%02d:%02d:00", value/100, value%100)
 }
+
+func GetPolygonFromCircle(lng, lat, distance float64, pointCount int) (points [][2]float64) {
+	points = make([][2]float64, pointCount)
+	for k := range points {
+		angle := float64(k) * 360 / float64(pointCount)
+		points[k][0], points[k][1] = ConvertDistanceToLogLat(lng, lat, float64(distance), angle)
+	}
+	return points
+}
+
+func GetPolygonFromCircleStr(lng, lat, distance float64, pointCount int) string {
+	points := GetPolygonFromCircle(lng, lat, distance, pointCount)
+	points2 := make([]string, len(points))
+	for k, v := range points {
+		points2[k] = fmt.Sprintf("%.6f,%.6f", v[0], v[1])
+	}
+	return strings.Join(points2, ";")
+}
+
+func ConvertDistanceToLogLat(lng, lat, distance, angle float64) (newLng, newLat float64) {
+	oneDu := 111319.55
+	newLng = lng + (distance*math.Sin(angle*math.Pi/180))/(oneDu*math.Cos(lat*math.Pi/180)) //将距离转换成经度的计算公式
+	newLat = lat + (distance*math.Cos(angle*math.Pi/180))/oneDu                             //将距离转换成纬度的计算公式
+	return newLng, newLat
+}