Coordinates to tile

coor2tile.js

// http://tile.openstreetmap.org/z/x/y.png
// example: http://tile.openstreetmap.org/12/2225/2367.png

lon2tile = (lon, zoom) => {
  return (Math.floor((lon+180)/360*Math.pow(2,zoom)));
};

lat2tile = (lat, zoom) => {
  return (Math.floor((1-Math.log(Math.tan(lat*Math.PI/180) + 1/Math.cos(lat*Math.PI/180))/Math.PI)/2 *Math.pow(2,zoom)));  
};

coords2title = (lon, lat, zoom) => {
  return {
    z: zoom,
    x: this.lon2tile(lon, zoom),
    y: this.lat2tile(lat, zoom)
  }
}

parseOpenStreetMapUrl = (geo) => {
  return `http://tile.openstreetmap.org/${geo.z}/${geo.x}/${geo.y}.png`
}