From 5ce6ace219c20f3319b7ef17fe5603b14ed71a65 Mon Sep 17 00:00:00 2001
From: gazebo <gazeboxu@gmail.com>
Date: Fri, 25 Jan 2019 11:56:01 +0800
Subject: [PATCH] - avoid index out of range for func IsPointInPolygon

---
 utils/utils_geo.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/utils/utils_geo.go b/utils/utils_geo.go
index ce6e174a..3d67a6d6 100644
--- a/utils/utils_geo.go
+++ b/utils/utils_geo.go
@@ -2,6 +2,9 @@ package utils
 
 // http://ju.outofmemory.cn/entry/130555
 func IsPointInPolygon(x float64, y float64, points [][2]float64) bool {
+	if len(points) == 0 {
+		return false
+	}
 	count := 0
 	x1, y1 := points[0][0], points[0][1]
 	x1Part := (y1 > y) || ((x1-x > 0) && (y1 == y))