/**
 * Copyright 2015 Teralytics AG
 *
 * @author Kirill Zhuravlev <kirill.zhuravlev@teralytics.ch>
 *
 */
(function(factory){if(typeof define==="function"&&define.amd){define(["leaflet","d3"],factory)}else if(typeof module==="object"&&module.exports){module.exports=factory(require("leaflet","d3"))}else{factory(L,d3)}})(function(L,d3){if(typeof d3=="undefined"){throw"D3 SVG Overlay for Leaflet requires D3 library loaded first"}if(typeof L=="undefined"){throw"D3 SVG Overlay for Leaflet requires Leaflet library loaded first"}if(L.version>="1.0"){d3.select("head").append("style").attr("type","text/css").text("g.d3-overlay *{pointer-events:visiblePainted;}")}L.D3SvgOverlay=(L.version<"1.0"?L.Class:L.Layer).extend({includes:L.version<"1.0"?L.Mixin.Events:[],_undef:function(a){return typeof a=="undefined"},_options:function(options){if(this._undef(options)){return this.options}options.zoomHide=this._undef(options.zoomHide)?false:options.zoomHide;options.zoomDraw=this._undef(options.zoomDraw)?true:options.zoomDraw;return this.options=options},_disableLeafletRounding:function(){this._leaflet_round=L.Point.prototype._round;L.Point.prototype._round=function(){return this}},_enableLeafletRounding:function(){L.Point.prototype._round=this._leaflet_round},draw:function(){this._disableLeafletRounding();this._drawCallback(this.selection,this.projection,this.map.getZoom());this._enableLeafletRounding()},initialize:function(drawCallback,options){this._options(options||{});this._drawCallback=drawCallback},_zoomChange:function(evt){this._disableLeafletRounding();var newZoom=this._undef(evt.zoom)?this.map._zoom:evt.zoom;this._zoomDiff=newZoom-this._zoom;this._scale=Math.pow(2,this._zoomDiff);this.projection.scale=this._scale;this._shift=this.map.latLngToLayerPoint(this._wgsOrigin)._subtract(this._wgsInitialShift.multiplyBy(this._scale));var shift=["translate(",this._shift.x,",",this._shift.y,") "];var scale=["scale(",this._scale,",",this._scale,") "];this._rootGroup.attr("transform",shift.concat(scale).join(""));if(this.options.zoomDraw){this.draw()}this._enableLeafletRounding()},onAdd:function(map){this.map=map;var _layer=this;if(L.version<"1.0"){map._initPathRoot();this._svg=d3.select(map._panes.overlayPane).select("svg");this._rootGroup=this._svg.append("g")}else{this._svg=L.svg();map.addLayer(this._svg);this._rootGroup=d3.select(this._svg._rootGroup).classed("d3-overlay",true)}this._rootGroup.classed("leaflet-zoom-hide",this.options.zoomHide);this.selection=this._rootGroup;this._pixelOrigin=map.getPixelOrigin();this._wgsOrigin=L.latLng([0,0]);this._wgsInitialShift=this.map.latLngToLayerPoint(this._wgsOrigin);this._zoom=this.map.getZoom();this._shift=L.point(0,0);this._scale=1;this.projection={latLngToLayerPoint:function(latLng,zoom){zoom=_layer._undef(zoom)?_layer._zoom:zoom;var projectedPoint=_layer.map.project(L.latLng(latLng),zoom)._round();return projectedPoint._subtract(_layer._pixelOrigin)},layerPointToLatLng:function(point,zoom){zoom=_layer._undef(zoom)?_layer._zoom:zoom;var projectedPoint=L.point(point).add(_layer._pixelOrigin);return _layer.map.unproject(projectedPoint,zoom)},unitsPerMeter:256*Math.pow(2,_layer._zoom)/40075017,map:_layer.map,layer:_layer,scale:1};this.projection._projectPoint=function(x,y){var point=_layer.projection.latLngToLayerPoint(new L.LatLng(y,x));this.stream.point(point.x,point.y)};this.projection.pathFromGeojson=d3.geo.path().projection(d3.geo.transform({point:this.projection._projectPoint}));this.projection.latLngToLayerFloatPoint=this.projection.latLngToLayerPoint;this.projection.getZoom=this.map.getZoom.bind(this.map);this.projection.getBounds=this.map.getBounds.bind(this.map);this.selection=this._rootGroup;if(L.version<"1.0")map.on("viewreset",this._zoomChange,this);this.draw()},getEvents:function(){return{zoomend:this._zoomChange}},onRemove:function(map){if(L.version<"1.0"){map.off("viewreset",this._zoomChange,this);this._rootGroup.remove()}else{this._svg.remove()}},addTo:function(map){map.addLayer(this);return this}});L.D3SvgOverlay.version="2.1";L.d3SvgOverlay=function(drawCallback,options){return new L.D3SvgOverlay(drawCallback,options)}});