114 行
3.6 KiB
JavaScript
114 行
3.6 KiB
JavaScript
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/*
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* L.Maidenhead displays a Maidenhead Locator of lines on the map.
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*/
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L.Maidenhead = L.LayerGroup.extend({
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options: {
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// Line and label color
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color: 'rgba(255, 0, 0, 0.4)',
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// Redraw on move or moveend
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redraw: 'move'
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},
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initialize: function (options) {
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L.LayerGroup.prototype.initialize.call(this);
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L.Util.setOptions(this, options);
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},
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onAdd: function (map) {
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this._map = map;
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var grid = this.redraw();
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this._map.on('viewreset '+ this.options.redraw, function () {
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grid.redraw();
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});
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this.eachLayer(map.addLayer, map);
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},
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onRemove: function (map) {
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// remove layer listeners and elements
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map.off('viewreset '+ this.options.redraw, this.map);
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this.eachLayer(this.removeLayer, this);
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},
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redraw: function () {
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var d3 = new Array(20,10,10,10,10,10,1 ,1 ,1 ,1 ,1/24,1/24,1/24,1/24,1/24,1/240,1/240,1/240,1/240,1/240/24,1/240/24 );
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var lat_cor = new Array(0 ,8 ,8 ,8 ,10,14,6 ,8 ,8 ,8 ,1.4 ,2.5 ,3 ,3.5 ,4 ,4 ,3.5 ,3.5 ,3 ,1.8 ,1.6 );
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var bounds = map.getBounds();
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var zoom = map.getZoom();
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var unit = d3[zoom];
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var lcor = lat_cor[zoom];
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var w = bounds.getWest();
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var e = bounds.getEast();
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var n = bounds.getNorth();
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var s = bounds.getSouth();
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if (zoom==1) {var c = 2;} else {var c = 0.1;}
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if (n > 85) n = 85;
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if (s < -85) s = -85;
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var left = Math.floor(w/(unit*2))*(unit*2);
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var right = Math.ceil(e/(unit*2))*(unit*2);
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var top = Math.ceil(n/unit)*unit;
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var bottom = Math.floor(s/unit)*unit;
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this.eachLayer(this.removeLayer, this);
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for (var lon = left; lon < right; lon += (unit*2)) {
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for (var lat = bottom; lat < top; lat += unit) {
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var bounds = [[lat,lon],[lat+unit,lon+(unit*2)]];
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this.addLayer(L.rectangle(bounds, {color: this.options.color, weight: 1, fill:false, interactive: false}));
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//var pont = map.latLngToLayerPoint([lat,lon]);
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//console.log(pont.x);
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this.addLayer(this._getLabel(lon+unit-(unit/lcor),lat+(unit/2)+(unit/lcor*c)));
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}
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}
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return this;
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},
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_getLabel: function(lon,lat) {
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var title_size = new Array(0 ,10,12,16,20,26,12,16,24,36,12 ,14 ,20 ,36 ,60 ,12 ,20 ,36 ,60 ,12 ,24 );
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var zoom = map.getZoom();
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var size = title_size[zoom]+'px';
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var title = '<span style="cursor: default;"><font style="color:'+this.options.color+'; font-size:'+size+'; font-weight: 900; ">' + this._getLocator(lon,lat) + '</font></span>';
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var myIcon = L.divIcon({className: 'my-div-icon', html: title});
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var marker = L.marker([lat,lon], {icon: myIcon}, clickable=false);
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return marker;
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},
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_getLocator: function(lon,lat) {
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var ydiv_arr=new Array(10, 1, 1/24, 1/240, 1/240/24);
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var d1 = "ABCDEFGHIJKLMNOPQR".split("");
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var d2 = "ABCDEFGHIJKLMNOPQRSTUVWX".split("");
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var d4 = new Array(0 ,1 ,1 ,1 ,1 ,1 ,2 ,2 ,2 ,2 ,3 ,3 ,3 ,3 ,3 ,4 ,4 ,4 ,4 ,5 ,5 );
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var locator = "";
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var x = lon;
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var y = lat;
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var precision = d4[map.getZoom()];
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while (x < -180) {x += 360;}
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while (x > 180) {x -=360;}
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x = x + 180;
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y = y + 90;
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locator = locator + d1[Math.floor(x/20)] + d1[Math.floor(y/10)];
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for (var i=0; i<4; i=i+1) {
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if (precision > i+1) {
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rlon = x%(ydiv_arr[i]*2);
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rlat = y%(ydiv_arr[i]);
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if ((i%2)==0) {
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locator += Math.floor(rlon/(ydiv_arr[i+1]*2)) +""+ Math.floor(rlat/(ydiv_arr[i+1]));
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} else {
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locator += d2[Math.floor(rlon/(ydiv_arr[i+1]*2))] +""+ d2[Math.floor(rlat/(ydiv_arr[i+1]))];
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}
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}
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}
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return locator;
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},
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});
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L.maidenhead = function (options) {
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return new L.Maidenhead(options);
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};
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