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diff --git a/assets/js/leaflet/L.Maidenhead.qrb.js b/assets/js/leaflet/L.Maidenhead.qrb.js
new file mode 100644
index 00000000..97438393
--- /dev/null
+++ b/assets/js/leaflet/L.Maidenhead.qrb.js
@@ -0,0 +1,189 @@
+/*
+ * L.Maidenhead displays a Maidenhead Locator of lines on the map.
+ */
+
+L.MaidenheadQrb = 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, 1, 1, 1, 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, 8, 1.7, 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)]];
+
+ if (zoom < 2 || zoom > 4) {
+ this.addLayer(this._getLabel(lon+unit-(unit/lcor),lat+(unit/2)+(unit/lcor*c)));
+ }
+ if (zoom < 3 ) {
+ this.addLayer(L.rectangle(bounds, {className: 'grid-rectangle', color: this.options.color, weight: 1, fill:false, interactive: false}));
+ }
+ if (zoom < 3 || zoom > 5) {
+ this.addLayer(L.rectangle(bounds, {className: 'grid-rectangle', color: this.options.color, weight: 1, fill:false, interactive: false}));
+ }
+
+ if (zoom < 3 || zoom > 5) {
+ this.addLayer(this._getLabel(lon+unit-(unit/lcor),lat+(unit/2)+(unit/lcor*c)));
+ }
+
+ }
+ }
+ // Added this to print fields and field name, while still showing worked/confirmed gridsquares
+ if (zoom < 5 && zoom > 2) {
+ unit = 10;
+ 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;
+ 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
+ }));
+ this.addLayer(this._getLabel2(lon + unit - (unit / lcor), lat + (unit / 2) + (unit / lcor * c)));
+ }
+ }
+ }
+ return this;
+ },
+
+ _getLabel: function(lon,lat) {
+ var title_size = new Array(0, 10, 14, 16, 6, 13, 14, 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 = '
' + this._getLocator(lon,lat) + '';
+ 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, 2, 2, 2, 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;
+ },
+
+ /*
+ Need this for the field printing, while showing worked/confirmed grids
+ */
+ _getLabel2: function(lon,lat) {
+ var title_size = new Array(0, 10, 12, 16, 20, 26, 26, 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 = '
' + this._getLocator2(lon,lat) + '';
+ var myIcon = L.divIcon({className: 'my-div-icon', html: title});
+ var marker = L.marker([lat,lon], {icon: myIcon}, clickable=false);
+ return marker;
+ },
+
+ /*
+ Need this for the field printing, while showing worked/confirmed grids
+ */
+ _getLocator2: 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, 1, 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.maidenheadqrb = function (options) {
+ return new L.MaidenheadQrb(options);
+};