fixed dependencies

vendor/github.com/paulmach/orb/internal/length/length.go

@@ -0,0 +1,71 @@
+package length
+
+import (
+	"fmt"
+
+	"github.com/paulmach/orb"
+)
+
+// Length returns the length of the boundary of the geometry
+// using 2d euclidean geometry.
+func Length(g orb.Geometry, df orb.DistanceFunc) float64 {
+	if g == nil {
+		return 0
+	}
+
+	switch g := g.(type) {
+	case orb.Point:
+		return 0
+	case orb.MultiPoint:
+		return 0
+	case orb.LineString:
+		return lineStringLength(g, df)
+	case orb.MultiLineString:
+		sum := 0.0
+		for _, ls := range g {
+			sum += lineStringLength(ls, df)
+		}
+
+		return sum
+	case orb.Ring:
+		return lineStringLength(orb.LineString(g), df)
+	case orb.Polygon:
+		return polygonLength(g, df)
+	case orb.MultiPolygon:
+		sum := 0.0
+		for _, p := range g {
+			sum += polygonLength(p, df)
+		}
+
+		return sum
+	case orb.Collection:
+		sum := 0.0
+		for _, c := range g {
+			sum += Length(c, df)
+		}
+
+		return sum
+	case orb.Bound:
+		return Length(g.ToRing(), df)
+	}
+
+	panic(fmt.Sprintf("geometry type not supported: %T", g))
+}
+
+func lineStringLength(ls orb.LineString, df orb.DistanceFunc) float64 {
+	sum := 0.0
+	for i := 1; i < len(ls); i++ {
+		sum += df(ls[i], ls[i-1])
+	}
+
+	return sum
+}
+
+func polygonLength(p orb.Polygon, df orb.DistanceFunc) float64 {
+	sum := 0.0
+	for _, r := range p {
+		sum += lineStringLength(orb.LineString(r), df)
+	}
+
+	return sum
+}