@goshawk22/leaflet-elevation/libs/leaflet-ruler.min.js

A Leaflet plugin that allows to add elevation profiles using d3js

L.Control.Ruler=L.Control.extend({options:{position:"topright",circleMarker:{color:"red",radius:2},lineStyle:{color:"red",dashArray:"1,6"},lengthUnit:{display:"km",decimal:2,factor:.001,label:"Distance:"},angleUnit:{display:"&deg;",decimal:2,factor:360,label:"Bearing:"}},initialize:function(options){L.setOptions(this,options),this._layers=L.layerGroup(),this._enabled=!1},onAdd:function(map){this._defaultCursor=map._container.style.cursor,this._map=map;let container=L.DomUtil.create("div","leaflet-bar");return container.classList.add("leaflet-ruler"),L.DomEvent.disableClickPropagation(container),L.DomEvent.on(container,"click",this._toggleMeasure,this),this._container=container},onRemove:function(){L.DomEvent.off(this._container,"click",this._toggleMeasure,this)},_attachMouseEvents:function(){let map=this._map;map.doubleClickZoom.disable(),L.DomEvent.on(map._container,"keydown",this._escape,this),L.DomEvent.on(map._container,"dblclick",this._closePath,this),map._container.style.cursor="crosshair",map.on("click",this._addPoint,this),map.on("mousemove",this._moving,this)},_removeMouseEvents:function(){let map=this._map;map.doubleClickZoom.enable(),L.DomEvent.off(map._container,"keydown",this._escape,this),L.DomEvent.off(map._container,"dblclick",this._closePath,this),map._container.style.cursor=this._defaultCursor,map.off("click",this._addPoint,this),map.off("mousemove",this._moving,this)},_disable:function(){this._enabled=!1,this._container.classList.remove("leaflet-ruler-clicked"),this._map.removeLayer(this._layers),this._layers=L.layerGroup(),this._latlngs=[],this._totalLength=0,this._removeMouseEvents()},_enable:function(){this._enabled=!0,this._container.classList.add("leaflet-ruler-clicked"),this._circles=L.featureGroup().addTo(this._layers),this._polyline=L.polyline([],this.options.lineStyle).addTo(this._layers),this._layers.addTo(this._map),this._latlngs=[],this._totalLength=0,this._attachMouseEvents()},_toggleMeasure:function(){this._enabled?this._disable():this._enable()},_drawTooltip:function(latlng,layer,incremental){let clickCount=this._latlngs.length,lastClick=clickCount?this._latlngs[clickCount-1]:latlng,bearing=this._calculateBearing(lastClick,latlng),distance=lastClick.distanceTo(latlng)*this.options.lengthUnit.factor,totalLength,plusLength;incremental?(totalLength=(clickCount?distance+this._totalLength||0:distance).toFixed(this.options.lengthUnit.decimal),plusLength=clickCount?'<br><div class="plus-length">(+'+distance.toFixed(this.options.lengthUnit.decimal)+")</div>":""):(this._totalLength+=distance,totalLength=(clickCount?this._totalLength:distance).toFixed(this.options.lengthUnit.decimal),plusLength="");var text="<b>"+this.options.angleUnit.label+"</b>&nbsp;"+bearing.toFixed(this.options.angleUnit.decimal)+"&nbsp;"+this.options.angleUnit.display+"<br><b>"+this.options.lengthUnit.label+"</b>&nbsp;"+totalLength+"&nbsp;"+this.options.lengthUnit.display+plusLength;layer.setLatLng(latlng);let tooltip=layer.getTooltip();return tooltip?tooltip.setTooltipContent(text):layer.bindTooltip(text,incremental?{direction:"auto",sticky:!0,offset:L.point(0,-40),className:"moving-tooltip"}:{permanent:!0,className:"result-tooltip"}).openTooltip(),layer},_addPoint:function(e){let latlng=e.latlng||e,point=L.circleMarker(latlng,this.options.circleMarker).addTo(this._circles);this._polyline.addLatLng(latlng),this._latlngs.length&&!latlng.equals(this._latlngs[this._latlngs.length-1])&&this._drawTooltip(latlng,point,!1),this._latlngs.push(latlng)},_moving:function(e){if(this._latlngs.length){let lastCLick=this._latlngs[this._latlngs.length-1];this._tempLine||(this._tempLine=L.polyline([],this.options.lineStyle).addTo(this._map)),this._tempPoint||(this._tempPoint=L.circleMarker(e.latlng,this.options.circleMarker).addTo(this._map)),this._tempLine.setLatLngs([lastCLick,e.latlng]),this._drawTooltip(e.latlng,this._tempPoint,!0),L.DomEvent.off(this._container,"click",this._toggleMeasure,this)}},_escape:function(e){27===e.keyCode&&(this._latlngs.length?this._closePath():(this._enabled=!0,this._toggleMeasure()))},_calculateBearing:function(start,end){const toRad=L.DomUtil.DEG_TO_RAD,toDeg=this.options.angleUnit.factor/2/Math.PI;let y=Math.sin((end.lng-start.lng)*toRad)*Math.cos(end.lat*toRad),x=Math.cos(start.lat*toRad)*Math.sin(end.lat*toRad)-Math.sin(start.lat*toRad)*Math.cos(end.lat*toRad)*Math.cos((end.lng-start.lng)*toRad);return(Math.atan2(y,x)*toDeg+this.options.angleUnit.factor)%this.options.angleUnit.factor},_closePath:function(){this._tempLine&&(this._map.removeLayer(this._tempLine),this._tempLine=null),this._tempPoint&&(this._map.removeLayer(this._tempPoint),this._tempLine=null),this._latlngs.length<=1&&this._map.removeLayer(this._circles),this._enabled=!1,L.DomEvent.on(this._container,"click",this._toggleMeasure,this),this._toggleMeasure()}}),L.control.ruler=function(options){return new L.Control.Ruler(options)};