gmaps.drawnLayer.js

function DrawnLayer(key, features, callback) {
  this.key = key;
  this.features = features;
  this.callback = callback;
  this.tileSize = new google.maps.Size(256, 256);
}

DrawnLayer.prototype.getTile = function(coord, zoom, ownerDocument) {
  // calculation for tile pixels and geo coordinates
  var getTileBounds = function(tilePoint){
    var tx = tilePoint.x;
    var ty = tilePoint.y;
    var zoom = tilePoint.z;
    var originShift = 2 * Math.PI * 6378137 / 2;

    var pixelsToMeters = function(px, py, zoom){
      var res = (2 * Math.PI * 6378137 / 256) / Math.pow(2, zoom);
      var mx = px * res - originShift;
      var my = py * res - originShift;
      return [mx, my];
    }

    var minMeters = pixelsToMeters(tx*256, ty*256, zoom);
    var maxMeters = pixelsToMeters((tx+1)*256, (ty+1)*256, zoom);
    bounds = [minMeters[0], minMeters[1], maxMeters[0], maxMeters[1]];

    var metersToLatLng = function(mx, my){
      var lng = (mx / originShift) * 180.0;
      var lat = (my / originShift) * 180.0;
      lat = -180 / Math.PI * (2 * Math.atan( Math.exp( lat * Math.PI / 180.0)) - Math.PI / 2.0);
      return [lat, lng];
    };

    var sw = metersToLatLng(bounds[0], bounds[1]);
    var ne = metersToLatLng(bounds[2], bounds[3]);

    return {
      north: ne[0],
      south: sw[0],
      east: ne[1],
      west: sw[1]
    };
  };

  var xyify = function(geometry, bounds) {
    if (geometry.length && typeof geometry[0] === 'number') {
      var lat = geometry[1];
      var lng = geometry[0];
      return {
        x: Math.round(256 * (lng - bounds.west) / (bounds.east - bounds.west)),
        y: (256 - Math.round(256 * (bounds.north - lat) / (bounds.north - bounds.south)))
      };
    } else {
      for(var pt = 0; pt < geometry.length; pt++){
        geometry[pt] = xyify(geometry[pt], bounds);
      }
      return geometry;
    }
  };

  var geojsonTileUrl = '//vector.mapzen.com/osm/' + this.features + '/{z}/{x}/{y}.json?api_key=vector-tiles-'
    .replace("{z}", zoom)
    .replace("{x}", coord.x)
    .replace("{y}", coord.y);
  geojsonTileUrl += this.key;
  var callback = this.callback;

  var canvas = ownerDocument.createElement('canvas');
  canvas.width = 256;
  canvas.height = 256;

  fetch(geojsonTileUrl)
    .then(function(response) {
      return response.json();
    }).then(function(json) {
      var ctx = canvas.getContext('2d');
      var bounds = getTileBounds({
        x: coord.x,
        y: coord.y,
        z: zoom
      });
      var newfeatures = [];
      for (var f = 0; f < json.features.length; f++) {
        json.features[f].geometry.coordinates = xyify(json.features[f].geometry.coordinates, bounds);
      }

      try {
        callback(json, ctx);
      } catch (e) {
        console.error(e);
      }
    }).catch(function(err) {
      console.log('Vector Tile download or render failed', err);
    });

  return canvas;
};

// include GitHub fetch polyfill: https://github.com/github/fetch
(function(self) {
  'use strict';

  if (self.fetch) {
    return
  }

  var support = {
    searchParams: 'URLSearchParams' in self,
    iterable: 'Symbol' in self && 'iterator' in Symbol,
    blob: 'FileReader' in self && 'Blob' in self && (function() {
      try {
        new Blob()
        return true
      } catch(e) {
        return false
      }
    })(),
    formData: 'FormData' in self,
    arrayBuffer: 'ArrayBuffer' in self
  }

  function normalizeName(name) {
    if (typeof name !== 'string') {
      name = String(name)
    }
    if (/[^a-z0-9\-#$%&'*+.\^_`|~]/i.test(name)) {
      throw new TypeError('Invalid character in header field name')
    }
    return name.toLowerCase()
  }

  function normalizeValue(value) {
    if (typeof value !== 'string') {
      value = String(value)
    }
    return value
  }

  // Build a destructive iterator for the value list
  function iteratorFor(items) {
    var iterator = {
      next: function() {
        var value = items.shift()
        return {done: value === undefined, value: value}
      }
    }

    if (support.iterable) {
      iterator[Symbol.iterator] = function() {
        return iterator
      }
    }

    return iterator
  }

  function Headers(headers) {
    this.map = {}

    if (headers instanceof Headers) {
      headers.forEach(function(value, name) {
        this.append(name, value)
      }, this)

    } else if (headers) {
      Object.getOwnPropertyNames(headers).forEach(function(name) {
        this.append(name, headers[name])
      }, this)
    }
  }

  Headers.prototype.append = function(name, value) {
    name = normalizeName(name)
    value = normalizeValue(value)
    var list = this.map[name]
    if (!list) {
      list = []
      this.map[name] = list
    }
    list.push(value)
  }

  Headers.prototype['delete'] = function(name) {
    delete this.map[normalizeName(name)]
  }

  Headers.prototype.get = function(name) {
    var values = this.map[normalizeName(name)]
    return values ? values[0] : null
  }

  Headers.prototype.getAll = function(name) {
    return this.map[normalizeName(name)] || []
  }

  Headers.prototype.has = function(name) {
    return this.map.hasOwnProperty(normalizeName(name))
  }

  Headers.prototype.set = function(name, value) {
    this.map[normalizeName(name)] = [normalizeValue(value)]
  }

  Headers.prototype.forEach = function(callback, thisArg) {
    Object.getOwnPropertyNames(this.map).forEach(function(name) {
      this.map[name].forEach(function(value) {
        callback.call(thisArg, value, name, this)
      }, this)
    }, this)
  }

  Headers.prototype.keys = function() {
    var items = []
    this.forEach(function(value, name) { items.push(name) })
    return iteratorFor(items)
  }

  Headers.prototype.values = function() {
    var items = []
    this.forEach(function(value) { items.push(value) })
    return iteratorFor(items)
  }

  Headers.prototype.entries = function() {
    var items = []
    this.forEach(function(value, name) { items.push([name, value]) })
    return iteratorFor(items)
  }

  if (support.iterable) {
    Headers.prototype[Symbol.iterator] = Headers.prototype.entries
  }

  function consumed(body) {
    if (body.bodyUsed) {
      return Promise.reject(new TypeError('Already read'))
    }
    body.bodyUsed = true
  }

  function fileReaderReady(reader) {
    return new Promise(function(resolve, reject) {
      reader.onload = function() {
        resolve(reader.result)
      }
      reader.onerror = function() {
        reject(reader.error)
      }
    })
  }

  function readBlobAsArrayBuffer(blob) {
    var reader = new FileReader()
    reader.readAsArrayBuffer(blob)
    return fileReaderReady(reader)
  }

  function readBlobAsText(blob) {
    var reader = new FileReader()
    reader.readAsText(blob)
    return fileReaderReady(reader)
  }

  function Body() {
    this.bodyUsed = false

    this._initBody = function(body) {
      this._bodyInit = body
      if (typeof body === 'string') {
        this._bodyText = body
      } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
        this._bodyBlob = body
      } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
        this._bodyFormData = body
      } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
        this._bodyText = body.toString()
      } else if (!body) {
        this._bodyText = ''
      } else if (support.arrayBuffer && ArrayBuffer.prototype.isPrototypeOf(body)) {
        // Only support ArrayBuffers for POST method.
        // Receiving ArrayBuffers happens via Blobs, instead.
      } else {
        throw new Error('unsupported BodyInit type')
      }

      if (!this.headers.get('content-type')) {
        if (typeof body === 'string') {
          this.headers.set('content-type', 'text/plain;charset=UTF-8')
        } else if (this._bodyBlob && this._bodyBlob.type) {
          this.headers.set('content-type', this._bodyBlob.type)
        } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
          this.headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8')
        }
      }
    }

    if (support.blob) {
      this.blob = function() {
        var rejected = consumed(this)
        if (rejected) {
          return rejected
        }

        if (this._bodyBlob) {
          return Promise.resolve(this._bodyBlob)
        } else if (this._bodyFormData) {
          throw new Error('could not read FormData body as blob')
        } else {
          return Promise.resolve(new Blob([this._bodyText]))
        }
      }

      this.arrayBuffer = function() {
        return this.blob().then(readBlobAsArrayBuffer)
      }

      this.text = function() {
        var rejected = consumed(this)
        if (rejected) {
          return rejected
        }

        if (this._bodyBlob) {
          return readBlobAsText(this._bodyBlob)
        } else if (this._bodyFormData) {
          throw new Error('could not read FormData body as text')
        } else {
          return Promise.resolve(this._bodyText)
        }
      }
    } else {
      this.text = function() {
        var rejected = consumed(this)
        return rejected ? rejected : Promise.resolve(this._bodyText)
      }
    }

    if (support.formData) {
      this.formData = function() {
        return this.text().then(decode)
      }
    }

    this.json = function() {
      return this.text().then(JSON.parse)
    }

    return this
  }

  // HTTP methods whose capitalization should be normalized
  var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT']

  function normalizeMethod(method) {
    var upcased = method.toUpperCase()
    return (methods.indexOf(upcased) > -1) ? upcased : method
  }

  function Request(input, options) {
    options = options || {}
    var body = options.body
    if (Request.prototype.isPrototypeOf(input)) {
      if (input.bodyUsed) {
        throw new TypeError('Already read')
      }
      this.url = input.url
      this.credentials = input.credentials
      if (!options.headers) {
        this.headers = new Headers(input.headers)
      }
      this.method = input.method
      this.mode = input.mode
      if (!body) {
        body = input._bodyInit
        input.bodyUsed = true
      }
    } else {
      this.url = input
    }

    this.credentials = options.credentials || this.credentials || 'omit'
    if (options.headers || !this.headers) {
      this.headers = new Headers(options.headers)
    }
    this.method = normalizeMethod(options.method || this.method || 'GET')
    this.mode = options.mode || this.mode || null
    this.referrer = null

    if ((this.method === 'GET' || this.method === 'HEAD') && body) {
      throw new TypeError('Body not allowed for GET or HEAD requests')
    }
    this._initBody(body)
  }

  Request.prototype.clone = function() {
    return new Request(this)
  }

  function decode(body) {
    var form = new FormData()
    body.trim().split('&').forEach(function(bytes) {
      if (bytes) {
        var split = bytes.split('=')
        var name = split.shift().replace(/\+/g, ' ')
        var value = split.join('=').replace(/\+/g, ' ')
        form.append(decodeURIComponent(name), decodeURIComponent(value))
      }
    })
    return form
  }

  function headers(xhr) {
    var head = new Headers()
    var pairs = (xhr.getAllResponseHeaders() || '').trim().split('\n')
    pairs.forEach(function(header) {
      var split = header.trim().split(':')
      var key = split.shift().trim()
      var value = split.join(':').trim()
      head.append(key, value)
    })
    return head
  }

  Body.call(Request.prototype)

  function Response(bodyInit, options) {
    if (!options) {
      options = {}
    }

    this.type = 'default'
    this.status = options.status
    this.ok = this.status >= 200 && this.status < 300
    this.statusText = options.statusText
    this.headers = options.headers instanceof Headers ? options.headers : new Headers(options.headers)
    this.url = options.url || ''
    this._initBody(bodyInit)
  }

  Body.call(Response.prototype)

  Response.prototype.clone = function() {
    return new Response(this._bodyInit, {
      status: this.status,
      statusText: this.statusText,
      headers: new Headers(this.headers),
      url: this.url
    })
  }

  Response.error = function() {
    var response = new Response(null, {status: 0, statusText: ''})
    response.type = 'error'
    return response
  }

  var redirectStatuses = [301, 302, 303, 307, 308]

  Response.redirect = function(url, status) {
    if (redirectStatuses.indexOf(status) === -1) {
      throw new RangeError('Invalid status code')
    }

    return new Response(null, {status: status, headers: {location: url}})
  }

  self.Headers = Headers
  self.Request = Request
  self.Response = Response

  self.fetch = function(input, init) {
    return new Promise(function(resolve, reject) {
      var request
      if (Request.prototype.isPrototypeOf(input) && !init) {
        request = input
      } else {
        request = new Request(input, init)
      }

      var xhr = new XMLHttpRequest()

      function responseURL() {
        if ('responseURL' in xhr) {
          return xhr.responseURL
        }

        // Avoid security warnings on getResponseHeader when not allowed by CORS
        if (/^X-Request-URL:/mi.test(xhr.getAllResponseHeaders())) {
          return xhr.getResponseHeader('X-Request-URL')
        }

        return
      }

      xhr.onload = function() {
        var options = {
          status: xhr.status,
          statusText: xhr.statusText,
          headers: headers(xhr),
          url: responseURL()
        }
        var body = 'response' in xhr ? xhr.response : xhr.responseText
        resolve(new Response(body, options))
      }

      xhr.onerror = function() {
        reject(new TypeError('Network request failed'))
      }

      xhr.ontimeout = function() {
        reject(new TypeError('Network request failed'))
      }

      xhr.open(request.method, request.url, true)

      if (request.credentials === 'include') {
        xhr.withCredentials = true
      }

      if ('responseType' in xhr && support.blob) {
        xhr.responseType = 'blob'
      }

      request.headers.forEach(function(value, name) {
        xhr.setRequestHeader(name, value)
      })

      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit)
    })
  }
  self.fetch.polyfill = true
})(typeof self !== 'undefined' ? self : this);