Geofence

Simple geofencing using Google or other geolocation providers's API

• [x] Check the current location's distance/duration againts the destination
• [x] Caches the distances to reduce geolocation API calls
• [x] Accepts callbacks for finding current location
• [x] Accepts callbacks for when inside the fence

Screenshot

examples/cli.js

node cli.js --apiKey=$apiKey --destination="San Francisco, CA" --mode=driving --updateInterval=1 --fenceDurationValue=25

Installation

Install with npm:

npm install geofence --save

Usage

The current location and destination can be address or lat/long. See Google's Distance Matrix API

let options = {
  // You can get it from here: https://cloud.google.com/maps-platform/
  apiKey: "ENTER YOUR API HERE", // Enter your own api key
  updateInterval: 5,  // Update current location (in seconds)

  // API function to get the current location.
  // It should return a string that is an address or lat/long
  // See Google's Distance Matrix API:
  // https://developers.google.com/maps/documentation/distance-matrix/intro
  getCurrentLocation: getCurrentLocation,

  // Callback for when we are inside the fence (optional)
  insideGeofenceCallBack: insideGeofenceCallBack,

  // Callback function to be called whenever the 
  // current location and distance is updated (optional)
  updateDistanceCallBack: updateDistanceCallBack,

  loopForever: false,  // Stop/continue once we are inside the fence

  activateFenceOn: "duration", // 'duration' OR 'distance' OR 'either'
  fenceDurationValue: 25 * 60, // range of the fence in seconds
  fenceDistanceValue: 1000, // range of the fence in meters
};

let locationSepc = {
  destination: "Oakland, CA", // Can be address or lat/long
  mode: "driving" //
};
//-----------------------------------------------------------------------------
var geofence = require("geofence")(options, locationSepc);

geofence.start(options);

Examples

• examples/example.js: Simple example
• examples/cli.js: demonstrates running with command line arguments:
  • node cli.js --apiKey=YOUR_API_KEY --destination="San Francisco, CA"
• examples/termux.js: demonstrates running inside Termux and Termux-API on Android using device GPS and system notifications. Run with:
  • node termux.js --apiKey=YOUR_API_KEY --destination="320 Main St, Venice, CA" --fenceDurationValue=300 --updateInterval=10
  • examples/termux_prompt.js: demonstrates running inside Termux and Termux-API on Android using device GPS and system notifications. It receives the inputs from command prompt:
  • node termux_prompt.js