staticmaps/elevation.go

package maps

import (
	"fmt"
	"net/url"
)

func (c Client) Elevation(ll []LatLng) ([]ElevationResult, error) {
	var r elevationResponse
	if err := c.doDecode(baseURL+elevation(ll), &r); err != nil {
		return nil, err
	}
	if r.Status != StatusOK {
		return nil, APIError{r.Status, ""}
	}
	return r.Results, nil
}

func (c Client) ElevationPolyline(p string) ([]ElevationResult, error) {
	var r elevationResponse
	if err := c.doDecode(baseURL+elevationpoly(p), &r); err != nil {
		return nil, err
	}
	if r.Status != StatusOK {
		return nil, APIError{r.Status, ""}
	}
	return r.Results, nil
}

func (c Client) ElevationPath(ll []LatLng, samples int) ([]ElevationResult, error) {
	var r elevationResponse
	if err := c.doDecode(baseURL+elevationpath(ll, samples), &r); err != nil {
		return nil, err
	}
	if r.Status != StatusOK {
		return nil, APIError{r.Status, ""}
	}
	return r.Results, nil
}

func (c Client) ElevationPathPoly(p string, samples int) ([]ElevationResult, error) {
	var r elevationResponse
	if err := c.doDecode(baseURL+elevationpathpoly(p, samples), &r); err != nil {
		return nil, err
	}
	if r.Status != StatusOK {
		return nil, APIError{r.Status, ""}
	}
	return r.Results, 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 []ElevationResult `json:"results"`
	Status  string            `json:"status"`
}
type ElevationResult struct {
	Elevation  float64 `json:"elevation"`
	Location   LatLng  `json:"location"`
	Resolution float64 `json:"resolution"`
}