113 行
3.6 KiB
JavaScript
113 行
3.6 KiB
JavaScript
/*
|
|
* L.Maidenhead displays a Maidenhead Locator of lines on the map.
|
|
*/
|
|
|
|
L.Maidenhead = L.LayerGroup.extend({
|
|
|
|
|
|
options: {
|
|
// Line and label color
|
|
color: 'rgba(255, 0, 0, 0.4)',
|
|
// Redraw on move or moveend
|
|
redraw: 'move'
|
|
},
|
|
|
|
initialize: function (options) {
|
|
L.LayerGroup.prototype.initialize.call(this);
|
|
L.Util.setOptions(this, options);
|
|
|
|
},
|
|
|
|
onAdd: function (map) {
|
|
this._map = map;
|
|
var grid = this.redraw();
|
|
this._map.on('viewreset '+ this.options.redraw, function () {
|
|
grid.redraw();
|
|
});
|
|
|
|
this.eachLayer(map.addLayer, map);
|
|
},
|
|
|
|
onRemove: function (map) {
|
|
// remove layer listeners and elements
|
|
map.off('viewreset '+ this.options.redraw, this.map);
|
|
this.eachLayer(this.removeLayer, this);
|
|
},
|
|
|
|
redraw: function () {
|
|
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 );
|
|
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 );
|
|
var bounds = map.getBounds();
|
|
var zoom = map.getZoom();
|
|
var unit = d3[zoom];
|
|
var lcor = lat_cor[zoom];
|
|
var w = bounds.getWest();
|
|
var e = bounds.getEast();
|
|
var n = bounds.getNorth();
|
|
var s = bounds.getSouth();
|
|
if (zoom==1) {var c = 2;} else {var c = 0.1;}
|
|
if (n > 85) n = 85;
|
|
if (s < -85) s = -85;
|
|
var left = Math.floor(w/(unit*2))*(unit*2);
|
|
var right = Math.ceil(e/(unit*2))*(unit*2);
|
|
var top = Math.ceil(n/unit)*unit;
|
|
var bottom = Math.floor(s/unit)*unit;
|
|
this.eachLayer(this.removeLayer, this);
|
|
for (var lon = left; lon < right; lon += (unit*2)) {
|
|
for (var lat = bottom; lat < top; lat += unit) {
|
|
var bounds = [[lat,lon],[lat+unit,lon+(unit*2)]];
|
|
this.addLayer(L.rectangle(bounds, {className: 'grid-rectangle', color: this.options.color, weight: 1, fill:false, interactive: false}));
|
|
//var pont = map.latLngToLayerPoint([lat,lon]);
|
|
//console.log(pont.x);
|
|
this.addLayer(this._getLabel(lon+unit-(unit/lcor),lat+(unit/2)+(unit/lcor*c)));
|
|
}
|
|
}
|
|
return this;
|
|
},
|
|
|
|
_getLabel: function(lon,lat) {
|
|
var title_size = new Array(0 ,10,12,16,20,26,15,16,24,36,12 ,14 ,20 ,36 ,60 ,12 ,20 ,36 ,60 ,12 ,24 );
|
|
var zoom = map.getZoom();
|
|
var size = title_size[zoom]+'px';
|
|
var title = '<span class="grid-text" style="cursor: default;"><font style="color:'+this.options.color+'; font-size:'+size+'; font-weight: 900; ">' + this._getLocator(lon,lat) + '</font></span>';
|
|
var myIcon = L.divIcon({className: 'my-div-icon', html: title});
|
|
var marker = L.marker([lat,lon], {icon: myIcon}, clickable=false);
|
|
return marker;
|
|
},
|
|
|
|
_getLocator: function(lon,lat) {
|
|
var ydiv_arr=new Array(10, 1, 1/24, 1/240, 1/240/24);
|
|
var d1 = "ABCDEFGHIJKLMNOPQR".split("");
|
|
var d2 = "ABCDEFGHIJKLMNOPQRSTUVWX".split("");
|
|
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 );
|
|
var locator = "";
|
|
var x = lon;
|
|
var y = lat;
|
|
var precision = d4[map.getZoom()];
|
|
while (x < -180) {x += 360;}
|
|
while (x > 180) {x -=360;}
|
|
x = x + 180;
|
|
y = y + 90;
|
|
locator = locator + d1[Math.floor(x/20)] + d1[Math.floor(y/10)];
|
|
for (var i=0; i<4; i=i+1) {
|
|
if (precision > i+1) {
|
|
rlon = x%(ydiv_arr[i]*2);
|
|
rlat = y%(ydiv_arr[i]);
|
|
if ((i%2)==0) {
|
|
locator += Math.floor(rlon/(ydiv_arr[i+1]*2)) +""+ Math.floor(rlat/(ydiv_arr[i+1]));
|
|
} else {
|
|
locator += d2[Math.floor(rlon/(ydiv_arr[i+1]*2))] +""+ d2[Math.floor(rlat/(ydiv_arr[i+1]))];
|
|
}
|
|
}
|
|
}
|
|
return locator;
|
|
},
|
|
|
|
|
|
|
|
|
|
});
|
|
|
|
L.maidenhead = function (options) {
|
|
return new L.Maidenhead(options);
|
|
};
|