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Leaflet.Graticule.js
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Leaflet.Graticule.js
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/**
* Create a Canvas as ImageOverlay to draw the Lat/Lon Graticule,
* and show the axis tick label on the edge of the map.
* Author: [email protected]
*/
L.LatLngGraticule = L.Layer.extend({
options: {
showLabel: true,
opacity: 1,
weight: 0.8,
color: '#aaa',
font: '12px Verdana',
lngLineCurved: 0,
latLineCurved: 0,
format: 'dd', // dd: decimal degrees; dmd: degrees - Decimal minutes; dms: Degrees Minutes Seconds; default 'dd'
precision: 4, // Lat and Lon precision
zoomInterval: [
{start: 2, end: 2, interval: 40},
{start: 3, end: 3, interval: 20},
{start: 4, end: 4, interval: 10},
{start: 5, end: 7, interval: 5},
{start: 8, end: 20, interval: 1}
]
},
initialize: function (options) {
L.setOptions(this, options);
var defaultFontName = 'Verdana';
var _ff = this.options.font.split(' ');
if (_ff.length < 2) {
this.options.font += ' ' + defaultFontName;
}
if (!this.options.fontColor) {
this.options.fontColor = this.options.color;
}
if (this.options.zoomInterval) {
if (this.options.zoomInterval.latitude) {
this.options.latInterval = this.options.zoomInterval.latitude;
if (!this.options.zoomInterval.longitude) {
this.options.lngInterval = this.options.zoomInterval.latitude;
}
}
if (this.options.zoomInterval.longitude) {
this.options.lngInterval = this.options.zoomInterval.longitude;
if (!this.options.zoomInterval.latitude) {
this.options.latInterval = this.options.zoomInterval.longitude;
}
}
if (!this.options.latInterval) {
this.options.latInterval = this.options.zoomInterval;
}
if (!this.options.lngInterval) {
this.options.lngInterval = this.options.zoomInterval;
}
}
},
onAdd: function (map) {
this._map = map;
if (!this._container) {
this._initCanvas();
}
map._panes.overlayPane.appendChild(this._container);
map.on('viewreset', this._reset, this);
map.on('move', this._reset, this);
map.on('moveend', this._reset, this);
// if (map.options.zoomAnimation && L.Browser.any3d) {
// map.on('zoom', this._animateZoom, this);
// }
this._reset();
},
onRemove: function (map) {
map.getPanes().overlayPane.removeChild(this._container);
map.off('viewreset', this._reset, this);
map.off('move', this._reset, this);
map.off('moveend', this._reset, this);
// if (map.options.zoomAnimation) {
// map.off('zoom', this._animateZoom, this);
// }
},
addTo: function (map) {
map.addLayer(this);
return this;
},
setOpacity: function (opacity) {
this.options.opacity = opacity;
this._updateOpacity();
return this;
},
bringToFront: function () {
if (this._canvas) {
this._map._panes.overlayPane.appendChild(this._canvas);
}
return this;
},
bringToBack: function () {
var pane = this._map._panes.overlayPane;
if (this._canvas) {
pane.insertBefore(this._canvas, pane.firstChild);
}
return this;
},
getAttribution: function () {
return this.options.attribution;
},
_initCanvas: function () {
this._container = L.DomUtil.create('div', 'leaflet-image-layer');
this._canvas = L.DomUtil.create('canvas', '');
if (this._map.options.zoomAnimation && L.Browser.any3d) {
L.DomUtil.addClass(this._canvas, 'leaflet-zoom-animated');
} else {
L.DomUtil.addClass(this._canvas, 'leaflet-zoom-hide');
}
this._updateOpacity();
this._container.appendChild(this._canvas);
L.extend(this._canvas, {
onselectstart: L.Util.falseFn,
onmousemove: L.Util.falseFn,
onload: L.bind(this._onCanvasLoad, this)
});
},
// _animateZoom: function (e) {
// var map = this._map,
// container = this._container,
// canvas = this._canvas,
// zoom = map.getZoom(),
// center = map.getCenter(),
// scale = map.getZoomScale(zoom),
// nw = map.containerPointToLatLng([0, 0]),
// se = map.containerPointToLatLng([canvas.width, canvas.height]),
//
// topLeft = map._latLngToNewLayerPoint(nw, zoom, center),
// size = map._latLngToNewLayerPoint(se, zoom, center)._subtract(topLeft),
// origin = topLeft._add(size._multiplyBy((1 / 2) * (1 - 1 / scale)));
//
// L.DomUtil.setTransform(container, origin, scale);
// },
_reset: function () {
var container = this._container,
canvas = this._canvas,
size = this._map.getSize(),
lt = this._map.containerPointToLayerPoint([0, 0]);
L.DomUtil.setPosition(container, lt);
container.style.width = size.x + 'px';
container.style.height = size.y + 'px';
canvas.width = size.x;
canvas.height = size.y;
canvas.style.width = size.x + 'px';
canvas.style.height = size.y + 'px';
this.__calcInterval();
this.__draw(true);
},
_onCanvasLoad: function () {
this.fire('load');
},
_updateOpacity: function () {
L.DomUtil.setOpacity(this._canvas, this.options.opacity);
},
// todo: Decimal degrees to Degrees Minutes Seconds
__deg_to_dms: function(deg) {
var degrees = Math.floor (deg);
var minfloat = (deg - degrees) * 60;
var min = Math.floor(minfloat);
var secfloat = (minfloat-min)*60;
var sec = Math.round(secfloat);
if (sec==60) {
min++;
sec=0;
}
if (min==60) {
degrees++;
min=0;
}
return ('' + degrees + '°' + min.toString(10).padStart(2, '0') + "'" + sec.toString(10).padStart(2, '0') + '"');
},
// todo: Decimal degrees to Degrees - Decimal Minutes
__deg_to_dmd: function(deg) {
var degrees = Math.floor (deg);
var minfloat = (deg - degrees) * 60;
var min = minfloat.toFixed(1);
if (min == 60.0) {
degrees ++;
min = 0.0;
}
if (min == 0.0){
return ('' + degrees + '°');
}
if ((min % 1).toFixed(1) == 0.0) {
min = minfloat.toFixed(0).toString(10).padStart(2, '0');
}
else {
min = minfloat.toFixed(1).toString(10).padStart(4, '0');
}
return ('' + degrees + '°' + min + "'");
},
__format_lat: function(lat) {
if (this.options.latFormatTickLabel) {
return this.options.latFormatTickLabel(lat);
}
switch (this.options.format) {
case 'dmd':
if (lat < 0) {
return this.__deg_to_dmd(lat * -1) + ' S';
}
else if (lat > 0) {
return this.__deg_to_dmd(lat) + ' N';
}
return this.__deg_to_dmd(lat);
case 'dms':
if (lat < 0) {
return this.__deg_to_dms(lat * -1) + ' S';
}
else if (lat > 0) {
return this.__deg_to_dms(lat) + ' N';
}
return this.__deg_to_dms(lat);
default:
// todo: format type of float
if (lat < 0) {
return '' + (lat*-1).toFixed(this.options.precision) + ' S';
}
else if (lat > 0) {
return '' + lat.toFixed(this.options.precision) + ' N';
}
return '' + lat.toFixed(this.options.precision);
}
},
__format_lng: function(lng, wrapLng) {
if (this.options.lngFormatTickLabel) {
return this.options.lngFormatTickLabel(lng);
}
switch (this.options.format) {
case 'dmd':
// todo: format type of float
if (lng > 0 && lng < wrapLng[1]) {
return this.__deg_to_dmd(lng) + ' E';
}
else if (lng < 0 && lng > wrapLng[0]) {
return this.__deg_to_dmd(lng*-1) + ' W';
}
else if (lng == wrapLng[0]) {
return this.__deg_to_dmd(lng*-1);
}
return this.__deg_to_dmd(lng);
case 'dms':
// todo: format type of float
if (lng > 0 && lng < wrapLng[1]) {
return this.__deg_to_dms(lng) + ' E';
}
else if (lng < 0 && lng > wrapLng[0]) {
return this.__deg_to_dms(lng*-1) + ' W';
}
else if (lng == wrapLng[0]) {
return this.__deg_to_dms(lng*-1);
}
return this.__deg_to_dms(lng);
default:
// todo: format type of float
if (lng > 0 && lng < wrapLng[1]) {
return '' + lng.toFixed(this.options.precision) + ' E';
}
else if (lng < 0 && lng > wrapLng[0]) {
return '' + (lng*-1).toFixed(this.options.precision) + ' W';
}
else if (lng == wrapLng[0]) {
return '' + (lng*-1).toFixed(this.options.precision);
}
return '' + lng.toFixed(this.options.precision);
}
},
__calcInterval: function() {
var zoom = this._map.getZoom();
if (this._currZoom != zoom) {
this._currLngInterval = 0;
this._currLatInterval = 0;
this._currZoom = zoom;
}
var interv;
if (!this._currLngInterval) {
try {
for (var idx in this.options.lngInterval) {
var dict = this.options.lngInterval[idx];
if (dict.start <= zoom) {
if (dict.end && dict.end >= zoom) {
this._currLngInterval = dict.interval;
break;
}
}
}
}
catch(e) {
this._currLngInterval = 0;
}
}
if (!this._currLatInterval) {
try {
for (var idx in this.options.latInterval) {
var dict = this.options.latInterval[idx];
if (dict.start <= zoom) {
if (dict.end && dict.end >= zoom) {
this._currLatInterval = dict.interval;
break;
}
}
}
}
catch(e) {
this._currLatInterval = 0;
}
}
},
__draw: function(label) {
function _parse_px_to_int(txt) {
if (txt.length > 2) {
if (txt.charAt(txt.length-2) == 'p') {
txt = txt.substr(0, txt.length-2);
}
}
try {
return parseInt(txt, 10);
}
catch(e) {}
return 0;
};
var canvas = this._canvas,
map = this._map,
curvedLon = this.options.lngLineCurved,
curvedLat = this.options.latLineCurved;
if (L.Browser.canvas && map) {
if (!this._currLngInterval || !this._currLatInterval) {
this.__calcInterval();
}
var latInterval = this._currLatInterval,
lngInterval = this._currLngInterval;
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.lineWidth = this.options.weight;
ctx.strokeStyle = this.options.color;
ctx.fillStyle = this.options.fontColor;
if (this.options.font) {
ctx.font = this.options.font;
}
var txtWidth = ctx.measureText('0').width;
var txtHeight = 12;
try {
var _font_size = ctx.font.split(' ')[0];
txtHeight = _parse_px_to_int(_font_size);
}
catch(e) {}
var ww = canvas.width,
hh = canvas.height;
var lt = map.containerPointToLatLng(L.point(0, 0));
var rt = map.containerPointToLatLng(L.point(ww, 0));
var rb = map.containerPointToLatLng(L.point(ww, hh));
var _lat_b = rb.lat,
_lat_t = lt.lat;
var _lon_l = lt.lng,
_lon_r = rt.lng;
var _point_per_lat = (_lat_t - _lat_b) / (hh * 0.2);
if (_point_per_lat < 1) { _point_per_lat = 1; }
if (_lat_b < -90) {
_lat_b = -90;
}
else {
_lat_b = parseInt(_lat_b - _point_per_lat, 10);
}
if (_lat_t > 90) {
_lat_t = 90;
}
else {
_lat_t = parseInt(_lat_t + _point_per_lat, 10);
}
var _point_per_lon = (_lon_r - _lon_l) / (ww * 0.2);
if (_point_per_lon < 1) { _point_per_lon = 1; }
if (_lon_l > 0 && _lon_r < 0) {
_lon_r += 360;
}
_lon_r = parseInt(_lon_r + _point_per_lon, 10);
_lon_l = parseInt(_lon_l - _point_per_lon, 10);
var ll, latstr, lngstr, _lon_delta = 0.5;
function __draw_lat_line(self, lat_tick) {
ll = map.latLngToContainerPoint(L.latLng(lat_tick, _lon_l));
latstr = self.__format_lat(lat_tick);
txtWidth = ctx.measureText(latstr).width;
if (curvedLat) {
if (typeof(curvedLat) == 'number') {
_lon_delta = curvedLat;
}
var __lon_left = _lon_l, __lon_right = _lon_r;
if (ll.x > 0) {
var __lon_left = map.containerPointToLatLng(L.point(0, ll.y));
__lon_left = __lon_left.lng - _point_per_lon;
ll.x = 0;
}
var rr = map.latLngToContainerPoint(L.latLng(lat_tick, __lon_right));
if (rr.x < ww) {
__lon_right = map.containerPointToLatLng(L.point(ww, rr.y));
__lon_right = __lon_right.lng + _point_per_lon;
if (__lon_left > 0 && __lon_right < 0) {
__lon_right += 360;
}
}
ctx.beginPath();
ctx.moveTo(ll.x, ll.y);
var _prev_p = null;
for (var j=__lon_left; j<=__lon_right; j+=_lon_delta) {
rr = map.latLngToContainerPoint(L.latLng(lat_tick, j));
ctx.lineTo(rr.x, rr.y);
if (self.options.showLabel && label && _prev_p != null) {
if (_prev_p.x < 0 && rr.x >= 0) {
var _s = (rr.x - 0) / (rr.x - _prev_p.x);
var _y = rr.y - ((rr.y - _prev_p.y) * _s);
ctx.fillText(latstr, 0, _y + (txtHeight/2));
}
else if (_prev_p.x <= (ww-txtWidth) && rr.x > (ww-txtWidth)) {
var _s = (rr.x - ww) / (rr.x - _prev_p.x);
var _y = rr.y - ((rr.y - _prev_p.y) * _s);
ctx.fillText(latstr, ww-txtWidth, _y + (txtHeight/2)-2);
}
}
_prev_p = {x:rr.x, y:rr.y, lon:j, lat:i};
}
ctx.stroke();
}
else {
var __lon_right = _lon_r;
var rr = map.latLngToContainerPoint(L.latLng(lat_tick, __lon_right));
if (curvedLon) {
__lon_right = map.containerPointToLatLng(L.point(0, rr.y));
__lon_right = __lon_right.lng;
rr = map.latLngToContainerPoint(L.latLng(lat_tick, __lon_right));
var __lon_left = map.containerPointToLatLng(L.point(ww, rr.y));
__lon_left = __lon_left.lng;
ll = map.latLngToContainerPoint(L.latLng(lat_tick, __lon_left));
}
ctx.beginPath();
ctx.moveTo(ll.x+1, ll.y);
ctx.lineTo(rr.x-1, rr.y);
ctx.stroke();
if (self.options.showLabel && label) {
var _yy = ll.y - (txtHeight/2) + 2;
ctx.fillText(latstr, 0, _yy);
ctx.fillText(latstr, ww-txtWidth, _yy);
}
}
};
if (latInterval > 0) {
for (var i=latInterval; i<=_lat_t; i+=latInterval) {
if (i >= _lat_b) {
__draw_lat_line(this, i);
}
}
for (var i=0; i>=_lat_b; i-=latInterval) {
if (i <= _lat_t) {
__draw_lat_line(this, i);
}
}
}
function __draw_lon_line(self, lon_tick) {
wrappedlng = map.options.crs.wrapLatLng(L.latLng(0, lon_tick)).lng;
//Lng range
wrapLng = map.options.crs.wrapLng
lngstr = self.__format_lng(wrappedlng, wrapLng);
txtWidth = ctx.measureText(lngstr).width;
var bb = map.latLngToContainerPoint(L.latLng(_lat_b, lon_tick));
if (curvedLon) {
if (typeof(curvedLon) == 'number') {
_lat_delta = curvedLon;
}
ctx.beginPath();
ctx.moveTo(bb.x, bb.y);
var _prev_p = null;
for (var j=_lat_b; j<_lat_t; j+=_lat_delta) {
var tt = map.latLngToContainerPoint(L.latLng(j, lon_tick));
ctx.lineTo(tt.x, tt.y);
if (self.options.showLabel && label && _prev_p != null) {
if (_prev_p.y > 8 && tt.y <= 8) {
ctx.fillText(lngstr, tt.x - (txtWidth/2), txtHeight);
}
else if (_prev_p.y >= hh && tt.y < hh) {
ctx.fillText(lngstr, tt.x - (txtWidth/2), hh-2);
}
}
_prev_p = {x:tt.x, y:tt.y, lon:lon_tick, lat:j};
}
ctx.stroke();
}
else {
var __lat_top = _lat_t;
var tt = map.latLngToContainerPoint(L.latLng(__lat_top, lon_tick));
if (curvedLat) {
__lat_top = map.containerPointToLatLng(L.point(tt.x, 0));
__lat_top = __lat_top.lat;
if (__lat_top > 90) { __lat_top = 90; }
tt = map.latLngToContainerPoint(L.latLng(__lat_top, lon_tick));
var __lat_bottom = map.containerPointToLatLng(L.point(bb.x, hh));
__lat_bottom = __lat_bottom.lat;
if (__lat_bottom < -90) { __lat_bottom = -90; }
bb = map.latLngToContainerPoint(L.latLng(__lat_bottom, lon_tick));
}
ctx.beginPath();
ctx.moveTo(tt.x, tt.y+1);
ctx.lineTo(bb.x, bb.y-1);
ctx.stroke();
if (self.options.showLabel && label) {
ctx.fillText(lngstr, tt.x + 3, txtHeight+1);
ctx.fillText(lngstr, bb.x + 3, hh-3);
}
}
};
if (lngInterval > 0) {
for (var i=lngInterval; i<=_lon_r; i+=lngInterval) {
if (i >= _lon_l) {
__draw_lon_line(this, i);
}
}
for (var i=0; i>=_lon_l; i-=lngInterval) {
if (i <= _lon_r) {
__draw_lon_line(this, i);
}
}
}
}
}
});
L.latlngGraticule = function (options) {
return new L.LatLngGraticule(options);
};