https://myairfields.com/maps/leaflet.rotatedMarker.js

1(function() {
2    // save these original methods before they are overwritten
3    var proto_initIcon = L.Marker.prototype._initIcon;
4    var proto_setPos = L.Marker.prototype._setPos;
5
6    var oldIE = (L.DomUtil.TRANSFORM === 'msTransform');
7
8    L.Marker.addInitHook(function () {
9        var iconOptions = this.options.icon && this.options.icon.options;
10        var iconAnchor = iconOptions && this.options.icon.options.iconAnchor;
11        if (iconAnchor) {
12            iconAnchor = (iconAnchor[0] + 'px ' + iconAnchor[1] + 'px');
13        }
14        this.options.rotationOrigin = this.options.rotationOrigin || iconAnchor || 'center bottom' ;
15        this.options.rotationAngle = this.options.rotationAngle || 0;
16
17        // Ensure marker keeps rotated during dragging
18        this.on('drag', function(e) { e.target._applyRotation(); });
19    });
20
21    L.Marker.include({
22        _initIcon: function() {
23            proto_initIcon.call(this);
24        },
25
26        _setPos: function (pos) {
27            proto_setPos.call(this, pos);
28            this._applyRotation();
29        },
30
31        _applyRotation: function () {
32            if(this.options.rotationAngle) {
33                this._icon.style[L.DomUtil.TRANSFORM+'Origin'] = this.options.rotationOrigin;
34
35                if(oldIE) {
36                    // for IE 9, use the 2D rotation
37                    this._icon.style[L.DomUtil.TRANSFORM] = 'rotate(' + this.options.rotationAngle + 'deg)';
38                } else {
39                    // for modern browsers, prefer the 3D accelerated version
40                    this._icon.style[L.DomUtil.TRANSFORM] += ' rotateZ(' + this.options.rotationAngle + 'deg)';
41                }
42            }
43        },
44
45        setRotationAngle: function(angle) {
46            this.options.rotationAngle = angle;
47            this.update();
48            return this;
49        },
50
51        setRotationOrigin: function(origin) {
52            this.options.rotationOrigin = origin;
53            this.update();
54            return this;
55        }
56    });
57})();