- getMapCenter

business/jxstore/cms/store.go

@@ -3,6 +3,7 @@ package cms
 import (
 	"errors"
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -35,8 +36,10 @@ type StoreExt struct {
 }
 
 type StoresInfo struct {
-	TotalCount int         `json:"totalCount"`
-	Stores     []*StoreExt `json:"stores"`
+	TotalCount   int         `json:"totalCount"`
+	MapCenterLng float64     `json:"mapCenterLng"`
+	MapCenterLat float64     `json:"mapCenterLat"`
+	Stores       []*StoreExt `json:"stores"`
 }
 
 var (
@@ -228,10 +231,10 @@ func GetStores(ctx *jxcontext.Context, keyword string, params map[string]interfa
 			mapLatitude, mapLongitude float64
 			mapRadius                 int
 		)
-		if mapLatitude2, ok := params["mapLatitude"].(string); ok {
+		if mapLongitude2, ok := params["mapLongitude"].(string); ok {
 			mapLimit = true
-			mapLatitude = utils.Str2Float64(mapLatitude2)
-			mapLongitude = utils.Str2Float64(params["mapLongitude"].(string))
+			mapLongitude = utils.Str2Float64(mapLongitude2)
+			mapLatitude = utils.Str2Float64(params["mapLatitude"].(string))
 			mapRadius = params["mapRadius"].(int)
 		}
 		for _, v := range storeList {
@@ -262,9 +265,49 @@ func GetStores(ctx *jxcontext.Context, keyword string, params map[string]interfa
 		}
 	}
 	dao.Commit(db)
+
+	retVal.MapCenterLng, retVal.MapCenterLat = getMapCenter(retVal.Stores)
 	return retVal, err
 }
 
+func getMapCenter(storeList []*StoreExt) (lng, lat float64) {
+	if len(storeList) == 0 {
+		return 0, 0
+	}
+
+	lngAvg := float64(0)
+	latAvg := float64(0)
+	storeListLenFloat := float64(len(storeList))
+	for _, store := range storeList {
+		lngAvg += store.FloatLng
+		latAvg += store.FloatLat
+	}
+	lngAvg = lngAvg / storeListLenFloat
+	latAvg = latAvg / storeListLenFloat
+
+	lngMean := float64(0)
+	latMean := float64(0)
+	for _, store := range storeList {
+		lngMean += (store.FloatLng - lngAvg) * (store.FloatLng - lngAvg)
+		latMean += (store.FloatLat - latAvg) * (store.FloatLat - latAvg)
+	}
+	lngMean = math.Sqrt(lngMean / storeListLenFloat)
+	latMean = math.Sqrt(latMean / storeListLenFloat)
+	newStoreList := []*StoreExt{}
+	for _, store := range storeList {
+		if store.FloatLng >= lngMean-lngAvg && store.FloatLng <= lngMean+lngAvg &&
+			store.FloatLat >= latMean-latAvg && store.FloatLat <= latMean+latAvg {
+			lng += store.FloatLng
+			lat += store.FloatLat
+			newStoreList = append(newStoreList, store)
+		}
+	}
+	if len(newStoreList) == len(storeList) {
+		return lng / float64(len(newStoreList)), lat / float64(len(newStoreList))
+	}
+	return getMapCenter(newStoreList)
+}
+
 func GetVendorStore(ctx *jxcontext.Context, vendorStoreID string, vendorID int) (retVal *StoreExt, err error) {
 	if handler := CurVendorSync.GetStoreHandler(vendorID); handler != nil {
 		result, err2 := handler.ReadStore(vendorStoreID)