添加两点间步行距离函数：WalkingDistance

platformapi/autonavi/autonavi.go

@@ -133,6 +133,10 @@ func (a *API) signParams(mapData map[string]interface{}) string {
 	return fmt.Sprintf("%X", md5.Sum([]byte(finalStr)))
 }
 
+func coordinate2String(lng, lat float64) (str string) {
+	return fmt.Sprintf("%.6f,%.6f", lng, lat)
+}
+
 func (a *API) AccessAPI(apiStr string, params map[string]interface{}) (retVal ResponseResult, err error) {
 	params2 := utils.MergeMaps(utils.Params2Map("key", a.key, "output", "json"), params)
 	params2[signKey] = a.signParams(params2)
@@ -183,7 +187,7 @@ func (a *API) CoordinateConvert(lng, lat float64, coordsys string) (retLng, retL
 		return 0.0, 0.0, nil
 	}
 	params := map[string]interface{}{
-		"locations": fmt.Sprintf("%.6f,%.6f", lng, lat),
+		"locations": coordinate2String(lng, lat),
 		"coordsys":  coordsys,
 	}
 	result, err := a.AccessAPI("assistant/coordinate/convert", params)
@@ -201,7 +205,7 @@ func (a *API) BatchCoordinateConvert(coords []*Coordinate, coordsys string) (out
 	}
 	var coordsStrList []string
 	for _, v := range coords {
-		coordsStrList = append(coordsStrList, fmt.Sprintf("%.6f,%.6f", v.Lng, v.Lat))
+		coordsStrList = append(coordsStrList, coordinate2String(v.Lng, v.Lat))
 	}
 	params := map[string]interface{}{
 		"locations": strings.Join(coordsStrList, "|"),
@@ -260,7 +264,7 @@ func (a *API) GetCoordinateDistrictCode(lng, lat float64) (districtCode int) {
 
 func (a *API) GetCoordinateAreaInfo(lng, lat float64) (areaInfo map[string]interface{}, err error) {
 	params := map[string]interface{}{
-		"location": fmt.Sprintf("%.6f,%.6f", lng, lat),
+		"location": coordinate2String(lng, lat),
 	}
 	result, err := a.AccessAPI("geocode/regeo", params)
 	return result, err
@@ -325,3 +329,18 @@ func (a *API) getDistrictsFromInterface(districts interface{}) (districtList []*
 func GetDistrictLevel(levelName string) (level int) {
 	return levelStr2IntMap[levelName]
 }
+
+// 两点之间的步行距离，单位为米
+func (a *API) WalkingDistance(lng1, lat1, lng2, lat2 float64) (distance float64) {
+	params := map[string]interface{}{
+		"origin":      coordinate2String(lng1, lat1),
+		"destination": coordinate2String(lng2, lat2),
+	}
+	result, err := a.AccessAPI("direction/walking", params)
+	if err == nil {
+		if paths, _ := result["route"].(map[string]interface{})["paths"].([]interface{}); len(paths) > 0 {
+			distance = utils.Interface2Float64WithDefault(paths[0].(map[string]interface{})["distance"], 0)
+		}
+	}
+	return distance
+}

platformapi/autonavi/autonavi_test.go

@@ -88,3 +88,8 @@ func TestGetCoordinateFromAddress(t *testing.T) {
 	lng, lat, districtCode := autonaviAPI.GetCoordinateFromAddress("天府广场", "成都市")
 	t.Logf("lng:%f, lat:%f, districtCode:%d", lng, lat, districtCode)
 }
+
+func TestWalkingDistance(t *testing.T) {
+	distance := autonaviAPI.WalkingDistance(104.057289, 30.694798, 104.066289, 30.695598)
+	t.Logf("distance:%f", distance)
+}