- IsPointInPolygon added

utils/utils_sort.go

@@ -0,0 +1,23 @@
+package utils
+
+type SortItem struct {
+	CompareValue int64
+	Index        int
+}
+
+type SortList []*SortItem
+
+func (p SortList) Len() int {
+	return len(p)
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (p SortList) Less(i, j int) bool {
+	return p[i].CompareValue < p[j].CompareValue
+}
+
+// Swap swaps the elements with indexes i and j.
+func (p SortList) Swap(i, j int) {
+	p[i], p[j] = p[j], p[i]
+}