Add Elevation API

elevation.go

@@ -0,0 +1,73 @@
+package maps
+
+import (
+	"fmt"
+	"net/url"
+)
+
+func (c Client) Elevation(ll []LatLng) (*ElevationResponse, error) {
+	var r ElevationResponse
+	if err := c.doDecode(baseURL+elevation(ll), &r); err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+func (c Client) ElevationPolyline(p string) (*ElevationResponse, error) {
+	var r ElevationResponse
+	if err := c.doDecode(baseURL+elevationpoly(p), &r); err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+func (c Client) ElevationPath(ll []LatLng, samples int) (*ElevationResponse, error) {
+	var r ElevationResponse
+	if err := c.doDecode(baseURL+elevationpath(ll, samples), &r); err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+func (c Client) ElevationPathPoly(p string, samples int) (*ElevationResponse, error) {
+	var r ElevationResponse
+	if err := c.doDecode(baseURL+elevationpathpoly(p, samples), &r); err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+func elevation(ll []LatLng) string {
+	p := url.Values{}
+	p.Set("locations", encodeLatLngs(ll))
+	return "elevation/json?" + p.Encode()
+}
+
+func elevationpoly(poly string) string {
+	p := url.Values{}
+	p.Set("locations", "enc:"+poly)
+	return "elevation/json?" + p.Encode()
+}
+
+func elevationpath(ll []LatLng, s int) string {
+	p := url.Values{}
+	p.Set("path", encodeLatLngs(ll))
+	p.Set("samples", fmt.Sprintf("%d", s))
+	return "elevation/json?" + p.Encode()
+}
+
+func elevationpathpoly(poly string, s int) string {
+	p := url.Values{}
+	p.Set("path", "enc:"+poly)
+	p.Set("samples", fmt.Sprintf("%d", s))
+	return "elevation/json?" + p.Encode()
+}
+
+type ElevationResponse struct {
+	Results []struct {
+		Elevation  float64 `json:"elevation"`
+		Location   LatLng  `json:"location"`
+		Resolution float64 `json:"resolution"`
+	}
+	Status string `json:"status"`
+}