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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\n * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\n * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\n * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\n * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\n * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n * POSSIBILITY OF SUCH DAMAGE.\n */\n\n(function() {\n  // Retain the value of the original onAdd and onRemove functions\n  let originalOnAdd = L.Marker.prototype.onAdd;\n  let originalOnRemove = L.Marker.prototype.onRemove;\n\n  // Add bounceonAdd options\n  L.Marker.mergeOptions({\n    bounceOnAdd: false,\n    bounceOnAddOptions: {\n      duration: 1000,\n      height: -1,\n      loop: 1,\n    },\n    bounceOnAddCallback: function() {},\n  });\n\n  L.Marker.include({\n\n    _toPoint: function(latlng) {\n      return this._map.latLngToContainerPoint(latlng);\n    },\n\n    _toLatLng: function(point) {\n      return this._map.containerPointToLatLng(point);\n    },\n\n    _motionStep: function(opts) {\n      let self = this;\n      let timePassed = new Date() - opts.start;\n      let progress = timePassed / opts.duration;\n\n      if (progress > 1) {\n        progress = 1;\n      }\n\n      let delta = self._easeOutBounce(progress);\n      opts.step(delta);\n\n      if (progress === 1) {\n        opts.start = new Date();\n        progress = 0;\n        if (opts.loop > 0) opts.loop = opts.loop - 1;\n        if (opts.loop === 0) {\n          opts.end();\n          return;\n        }\n      }\n\n      self._animationId = L.Util.requestAnimFrame(function(timestamp) {\n        self._motionStep(opts);\n      });\n    },\n\n    _bounceMotion: function(opts, callback) {\n      let original = L.latLng(this._origLatlng);\n      let start_y = this._dropPoint.y;\n      let start_x = this._dropPoint.x;\n      let distance = this._point.y - start_y;\n      let self = this;\n\n      self._animationId = L.Util.requestAnimFrame(function() {\n        self._motionStep({\n          duration: opts.duration || 1000, // 1 sec by default\n          loop: opts.loop || 1,\n          start: new Date(),\n          step: function(delta) {\n            self._dropPoint.y =\n              start_y\n            + (distance * delta)\n            - (self._map.project(self._map.getCenter()).y - self._origMapCenter.y);\n            self._dropPoint.x =\n              start_x\n            - (self._map.project(self._map.getCenter()).x - self._origMapCenter.x);\n            self.setLatLng(self._toLatLng(self._dropPoint));\n          },\n          end: function() {\n            self.setLatLng(original);\n            if (typeof callback === 'function') callback();\n          },\n        });\n      });\n    },\n\n    // Many thanks to Robert Penner for this function\n    _easeOutBounce: function(pos) {\n      if ((pos) < (1 / 2.75)) {\n        return (7.5625 * pos * pos);\n      } else if (pos < (2 / 2.75)) {\n        return (7.5625 * (pos -= (1.5 / 2.75)) * pos + 0.75);\n      } else if (pos < (2.5 / 2.75)) {\n        return (7.5625 * (pos -= (2.25 / 2.75)) * pos + 0.9375);\n      } else {\n        return (7.5625 * (pos -= (2.625 / 2.75)) * pos + 0.984375);\n      }\n    },\n\n    // Bounce : if options.height in pixels is not specified, drop from top.\n    // If options.duration is not specified animation is 1s long.\n    bounce: function(options, endCallback) {\n      if (typeof options === 'function') {\n        endCallback = options;\n        options = null;\n      }\n      options = options || {duration: 1000, height: -1, loop: 1};\n\n      // backward compatibility\n      if (typeof options === 'number') {\n        options.duration = arguments[0];\n        options.height = arguments[1];\n      }\n\n      // Keep original map center\n      this._origMapCenter = this._map.project(this._map.getCenter());\n      this._dropPoint = this._getDropPoint(options.height);\n      this._bounceMotion(options, endCallback);\n    },\n\n    stopBounce: function(){\n      // We may have modified the marker; so we need to place it where it\n      // belongs so next time its coordinates are not changed.\n      this.setLatLng(this._origLatlng);\n      L.Util.cancelAnimFrame(this._animationId);\n    },\n\n    // This will get you a drop point given a height.\n    // If no height is given, the top y will be used.\n    _getDropPoint: function(height) {\n      // Get current coordidates in pixel\n      this._point = this._toPoint(this._origLatlng);\n      let top_y;\n      if (height === undefined || height < 0) {\n        top_y = this._toPoint(this._map.getBounds()._northEast).y;\n      } else {\n        top_y = this._point.y - height;\n      }\n      return new L.Point(this._point.x, top_y);\n    },\n\n    onAdd: function(map) {\n      this._map = map;\n\n      // Call leaflet original method to add the Marker to the map.\n      originalOnAdd.call(this, map);\n\n      // Keep original latitude and longitude\n      this._origLatlng = this.getLatLng();\n\n      if (this.options.bounceOnAdd === true) {\n        this.bounce(this.options.bounceOnAddOptions, this.options.bounceOnAddCallback);\n      }\n    },\n\n    onRemove: function(map) {\n      this.stopBounce();\n      originalOnRemove.call(this, map);\n    },\n  });\n})();\n"]}