/**
 * @param layer         the layer object
 * @param marker        current marker object
 * @param pointPos      current marker's pixel position
 * @param size          current marker's icon size
 */

var layer = L.canvasMarkerLayer({
  userDrawFunc: function(layer, marker, pointPos, size){
    var ctx = layer._context;
    ctx.beginPath();
    ctx.arc(pointPos.x, pointPos.y, size[0] / 2, 0, 2 * Math.PI);
    ctx.fillStyle = 'rgba(255,12,0,0.4)';
    ctx.fill();
    ctx.closePath();
  }
}).addTo(map);