// PathToGeoJSON ..
func (t Tracker) PathToGeoJSON(path []geo.Point) (string, error) {
fc := new(gj.FeatureCollection)
// Start marker
var p *gj.Feature
start := new(gj.Point)
start.Type = `Point`
c := new(gj.Coordinate)
c[0] = gj.Coord(path[0].Lng)
c[1] = gj.Coord(path[0].Lat)
start.Coordinates = *c
// Path line
var f *gj.Feature
line := new(gj.LineString)
line.Type = `LineString`
//var cordinates gj.Coordinates
for _, p := range path {
coord := new(gj.Coordinate)
coord[0] = gj.Coord(p.Lng)
coord[1] = gj.Coord(p.Lat)
line.AddCoordinates(*coord)
//cordinates = append(cordinates, *coord)
}
//line.AddCoordinates(cordinates)
fmt.Println(line.Type)
f = gj.NewFeature(line, nil, nil)
p = gj.NewFeature(start, nil, nil)
fc.AddFeatures(f, p)
fc.Type = `FeatureCollection`
geojson, e := gj.Marshal(fc)
return geojson, e
}
func makeFeaturefromRecord(r *Record) string {
var f *gj.Feature
lon := gj.Coord(r.Longitude)
lat := gj.Coord(r.Latitude)
p := gj.NewPoint(gj.Coordinate{lon, lat})
id := r.BusID
props := make(map[string]interface{})
props["BusName"] = r.BusName
props["RouteID"] = r.RouteID
props["TripID"] = r.TripID
props["TripHeadsign"] = r.TripHeadsign
props["Service"] = r.Service
props["LocationUpdated"] = r.LocationUpdated
f = gj.NewFeature(p, props, id)
gjstr, err := gj.Marshal(f)
if err != nil {
log.Fatal("geojson marshall failed", err)
}
return gjstr
}
// isOtherGeo searches for non-standard geo data in the given json map. It looks for the presence
// of lat/lng (and a few variations thereof) or x/y values in the object as well as a distance/radius/accuracy
// field and creates a geojson point out of it and returns that, along with a boolean value
// representing whether or not it found any geo data in the object. It will also look for
// any keys that hold an array of two numbers with a key name that suggests that it might
// be a lng/lat array.
//
// The following keys will be detected as Latitude:
// "lat", "latitude"
// "y"
//
// The following keys will be detected as Longitude:
// "lng", "lon", "long", "longitude"
// "x"
//
// The following keys will be used to fill the "radius" property of the resulting geojson:
// "dist", "distance"
// "rad", "radius"
// "acc", "accuracy"
//
// The following keys will be searched for a long/lat pair:
// "geo"
// "loc" or "location"
// "coord", "coords", "coordinate" or "coordinates"
func isOtherGeo(o map[string]interface{}) (bool, *Geo) {
var foundLat, foundLng, foundDst bool
var lat, lng, dst float64
for k, v := range o {
switch strings.ToLower(k) {
case "lat", "latitude", "y":
lat, foundLat = v.(float64)
case "lng", "lon", "long", "longitude", "x":
lng, foundLng = v.(float64)
case "dst", "dist", "distance", "rad", "radius", "acc", "accuracy":
dst, foundDst = v.(float64)
case "geo", "loc", "location", "coord", "coordinate", "coords", "coordinates":
g, ok := v.([]float64)
if !ok || len(g) != 2 {
break
}
lng, lat = g[0], g[1]
foundLat, foundLng = true, true
}
}
if foundLat && foundLng && latIsValid(lat) && lngIsValid(lng) {
p := gj.NewPoint(gj.Coordinate{gj.CoordType(lng), gj.CoordType(lat)})
pstr, _ := gj.Marshal(p)
var geo map[string]interface{}
json.Unmarshal([]byte(pstr), &geo)
debugLog("Found other geo:", geo)
g := &Geo{
Geo: geo,
}
if foundDst {
g.Radius = dst
}
return true, g
}
return false, nil
}