feat: add center() method for geo.bbox

geo/geo.go

@@ -1,6 +1,9 @@
 package geo
 
-import "math"
+import (
+	"fmt"
+	"math"
+)
 
 const (
 	earthRadius = 6371e3
@@ -15,6 +18,11 @@ type LatLonPoint struct {
 	Lon float64
 }
 
+func (s LatLonPoint) String() string {
+	return fmt.Sprintf("Point{Lon: %f, Lat: %f}",
+		s.Lon, s.Lat)
+}
+
 type BBox struct {
 	MinLon float64
 	MinLat float64
@@ -28,3 +36,10 @@ func (b BBox) In(pt LatLonPoint) bool {
 		b.MaxLon >= pt.Lon &&
 		b.MaxLat >= pt.Lat
 }
+
+func (b BBox) Center() LatLonPoint {
+	return LatLonPoint{
+		Lat: (b.MinLat + b.MaxLat) / 2.0,
+		Lon: (b.MinLon + b.MaxLon) / 2.0,
+	}
+}

random/latlon_test.go

@@ -181,3 +181,18 @@ func TestLatLon(t *testing.T) {
 		require.True(t, bbox.In(pt))
 	}
 }
+
+func TestBBoxCenter(t *testing.T) {
+	bbox := geo.BBox{
+		MinLon: 1.213284,
+		MinLat: 18.600047,
+		MaxLon: 11.587763,
+		MaxLat: 25.518278,
+	}
+	expected := geo.LatLonPoint{
+		Lat: 22.0591625,
+		Lon: 6.4005235,
+	}
+	center := bbox.Center()
+	require.Equal(t, expected, center)
+}