Leaflet-Ruler Plugin

A simple leaflet plugin to measure true bearing and distance between clicked points. Extends L.Control.

Demo

Requirements

• Leaflet 1.0.0+

Usage

• Create a leaflet map
• Include leaflet-ruler.js and leaflet-ruler.css files.

<link
    rel="stylesheet"
    href="https://cdn.jsdelivr.net/gh/gokertanrisever/leaflet-ruler@master/src/leaflet-ruler.css"
    integrity="sha384-P9DABSdtEY/XDbEInD3q+PlL+BjqPCXGcF8EkhtKSfSTr/dS5PBKa9+/PMkW2xsY"
    crossorigin="anonymous"
/>
<script
    src="https://cdn.jsdelivr.net/gh/gokertanrisever/leaflet-ruler@master/src/leaflet-ruler.js"
    integrity="sha384-8SqKZR7V8uOetpjjbcNJHvwuHpb074WS0UXjCLhzfJUqYn3B/uWx1WVv5mwRp1mV"
    crossorigin="anonymous"
></script>

• Add Ruler control to map

L.control.ruler().addTo(map);

• Escape button finishes measurement path and starts a new measurement. Second push to escape turns off the plugin.
• Double-click also finishes measurement path and starts a new measurement.
• It's possible to add other units. No need to specify any option value to use defaults.

var options = {
    position: 'topleft',
    lengthUnit: {
        factor: 0.539956803, //  from km to nm
        display: 'Nautical Miles',
        decimal: 2,
    },
};
L.control.ruler(options).addTo(map);

Default Options

options: {
      position: 'topright',         // Leaflet control position option
      circleMarker: {               // Leaflet circle marker options for points used in this plugin
        color: 'red',
        radius: 2
      },
      lineStyle: {                  // Leaflet polyline options for lines used in this plugin
        color: 'red',
        dashArray: '1,6'
      },
      lengthUnit: {                 // You can use custom length units. Default unit is kilometers.
        display: 'km',              // This is the display value will be shown on the screen. Example: 'meters'
        decimal: 2,                 // Distance result will be fixed to this value.
        factor: null,               // This value will be used to convert from kilometers. Example: 1000 (from kilometers to meters)
        label: 'Distance:'
      },
      angleUnit: {
        display: '°',           // This is the display value will be shown on the screen. Example: 'Gradian'
        decimal: 2,                 // Bearing result will be fixed to this value.
        factor: null,                // This option is required to customize angle unit. Specify solid angle value for angle unit. Example: 400 (for gradian).
        label: 'Bearing:'
      }
    }