A Leaflet plug-in for animating marker with ability to get/set progress!

🔗 Simple realworld use example

compatible and tested with the latest stable Leaflet version leaflet-1.9.2. (not tested with old versions)

This plugin internally uses window.requestAnimationFrame through the Leaflet function L.Util.requestAnimFrame

• Animate your marker along a polyline.
• You can zoom in/out, your moving marker will be at the right place !
• You can pause or end the animation whenever you want.
• You can set/get progress whenever you want.
• You can deal with events.
• You can make loop.
• You can add the point one by one.
• You can add station at some points of the polyline.

Include the plugin JS file on your page after Leaflet files, using your method of choice:

• Download the code
• Use unpkg CDN: https://unpkg.com/leaflet.markerplayer
• Install with npm: npm install leaflet.markerplayer

In each case, use files in the dist folder.

Then add your first MarkerPlayer:

let myMarkerPlayer = L.markerPlayer([
    {
        latlng: [48.8567, 2.3508]
    },
    {
        latlng: [48.8567, 2.3508]
    }
], 30000).addTo(map);
//...
myMarkerPlayer.start();

Factory

L.markerPlayer(<Point[]> points, <Number | Number[]> duration [,<Object> options]);

points:

• array of Objects with latlng property

Note: As Leaftlet's other functions, it also accept latlng property in a simple Array form and simple object form (see Leaflet docs).

durations:

• if number : total duration (autocalculate duration in ms per line segment proportionnaly to distance between points).
• if array of number : duration in ms per line segment.

Options All the Leaflet marker's options are available plus:

• autostart: if true the marker will start automatically after it is added to map. Default: false

• loop: if true the marker will start automatically at the beginning of the polyline when the it arrives at the end. Default: false

Methods

Getter

• isRunning(): return true if the marker is currently moving.

• isPaused(): return true if the marker is paused

• isEnded(): return true if the marker is arrived to the last position or it has been stopped manually

• isStarted(): return true if the marker has started

• getProgress(<Boolean> timeFormat = false): return animation progress in percentage by default or in case timeFormat = true the elapsed time(ms) relative to the total animation duration value.

Note: Marker.getLatLng() still works and give the current position

Setter

• start(): the marker begins its path or resumes if it is paused.

• stop(): manually stops the marker, if you call start after, the marker starts again the polyline at the beginning.

• pause(): just pauses the marker

• resume(): the marker resumes its animation

• addPoint(<Point> point, <Number> duration): adds a point to the polyline. Useful, if we have to set the path one by one.

• moveTo(<Point> point, <Number> duration): stops current animation and make the marker move to point in duration ms.

• addStation(<Number> pointIndex, <Number> duration): the marker will stop at the pointIndexth points of the polyline during duration ms. You can't add a station at the first or last point of the polyline.

• setProgress(<Number> percentage): set animation progress in percentage.

Events

• start: fired when the animation starts.
• end: fired when the animation stops; passes progress value to event data.
• loop: fired when the animation begin a new loop; passes progress value to event data.
• pointchange: fired when the animation point changes; passes the new point value to event data.
• progresschange: fired when the animation progress changes; passes progress value to event data.

Note: Event are not synchrone because of the use of requestAnimationFrame. If you quit the tab where the animation is working, events will be fired when the tab will get back the focus.

This plugin internally uses window.requestAnimationFrame through the Leaflet function L.Util.requestAnimFrame. When the browser need to repaint, the marker interpolate linearly its position thanks to the elapsed time.

Why do you just not use transitions ?

If your marker moves very slowly (1-2 min or more for one transition) and you zoom in, your marker will be at the wrong place and take a lot of time to be where it has to be. Moreover, you have to do some hacks to get the current position of the marker during the animation.

• accepting latlng array as points

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MIT License