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533 lines
20 KiB
533 lines
20 KiB
/* eslint-disable indent,semi */
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/**
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* Create a Canvas as ImageOverlay to draw the Lat/Lon Graticule,
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* and show the axis tick label on the edge of the map.
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* Author: lanwei@cloudybay.com.tw
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*/
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(function (window, document, undefined) {
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L.LatLngGraticule = L.Layer.extend({
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includes: (L.Evented.prototype || L.Mixin.Events),
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options: {
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showLabel: true,
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opacity: 1,
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weight: 0.8,
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color: '#aaa',
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font: '12px Verdana',
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dashArray: [0,0],
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lngLineCurved: 0,
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latLineCurved: 0,
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zoomInterval: [
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{start: 2, end: 2, interval: 40},
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{start: 3, end: 3, interval: 20},
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{start: 4, end: 4, interval: 10},
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{start: 5, end: 7, interval: 5},
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{start: 8, end: 20, interval: 1}
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],
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sides: ['N', 'S', 'E', 'W']
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},
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initialize: function (options) {
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L.setOptions(this, options);
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var defaultFontName = 'Verdana';
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var _ff = this.options.font.split(' ');
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if (_ff.length < 2) {
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this.options.font += ' ' + defaultFontName;
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}
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if (!this.options.fontColor) {
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this.options.fontColor = this.options.color;
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}
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if (this.options.zoomInterval) {
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if (this.options.zoomInterval.latitude) {
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this.options.latInterval = this.options.zoomInterval.latitude;
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if (!this.options.zoomInterval.longitude) {
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this.options.lngInterval = this.options.zoomInterval.latitude;
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}
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}
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if (this.options.zoomInterval.longitude) {
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this.options.lngInterval = this.options.zoomInterval.longitude;
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if (!this.options.zoomInterval.latitude) {
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this.options.latInterval = this.options.zoomInterval.longitude;
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}
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}
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if (!this.options.latInterval) {
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this.options.latInterval = this.options.zoomInterval;
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}
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if (!this.options.lngInterval) {
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this.options.lngInterval = this.options.zoomInterval;
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}
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}
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},
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onAdd: function (map) {
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this._map = map;
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if (!this._canvas) {
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this._initCanvas();
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}
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map._panes.overlayPane.appendChild(this._canvas);
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map.on('viewreset', this._reset, this);
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map.on('move', this._reset, this);
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map.on('moveend', this._reset, this);
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if (map.options.zoomAnimation && L.Browser.any3d) {
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map.on('zoomanim', this._animateZoom, this);
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}
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this._reset();
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},
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onRemove: function (map) {
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L.DomUtil.remove(this._canvas);
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map.off('viewreset', this._reset, this);
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map.off('move', this._reset, this);
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map.off('moveend', this._reset, this);
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if (map.options.zoomAnimation) {
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map.off('zoomanim', this._animateZoom, this);
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}
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},
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addTo: function (map) {
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map.addLayer(this);
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return this;
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},
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setOpacity: function (opacity) {
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this.options.opacity = opacity;
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this._updateOpacity();
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return this;
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},
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bringToFront: function () {
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if (this._canvas) {
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//this._map._panes.overlayPane.appendChild(this._canvas);
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}
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return this;
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},
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bringToBack: function () {
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var pane = this._map._panes.overlayPane;
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if (this._canvas) {
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//pane.insertBefore(this._canvas, pane.firstChild);
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}
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return this;
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},
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getAttribution: function () {
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return this.options.attribution;
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},
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_initCanvas: function () {
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this._canvas = L.DomUtil.create('canvas', '');
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if (this._map.options.zoomAnimation && L.Browser.any3d) {
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L.DomUtil.addClass(this._canvas, 'leaflet-zoom-animated');
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} else {
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L.DomUtil.addClass(this._canvas, 'leaflet-zoom-hide');
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}
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this._updateOpacity();
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L.extend(this._canvas, {
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onselectstart: L.Util.falseFn,
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onmousemove: L.Util.falseFn,
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onload: L.bind(this._onCanvasLoad, this)
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});
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},
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_animateZoom: function (e) {
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var map = this._map,
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canvas = this._canvas,
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scale = map.getZoomScale(e.zoom),
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nw = map.containerPointToLatLng([0, 0]),
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se = map.containerPointToLatLng([canvas.width, canvas.height]),
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topLeft = map._latLngToNewLayerPoint(nw, e.zoom, e.center),
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size = map._latLngToNewLayerPoint(se, e.zoom, e.center)._subtract(topLeft),
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origin = topLeft._add(size._multiplyBy((1 / 2) * (1 - 1 / scale)));
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L.DomUtil.setTransform(canvas, origin, scale);
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},
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_reset: function () {
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var canvas = this._canvas,
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size = this._map.getSize(),
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lt = this._map.containerPointToLayerPoint([0, 0]);
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L.DomUtil.setPosition(canvas, lt);
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canvas.width = size.x;
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canvas.height = size.y;
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canvas.style.width = size.x + 'px';
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canvas.style.height = size.y + 'px';
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this.__calcInterval();
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this.__draw(true);
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},
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_onCanvasLoad: function () {
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this.fire('load');
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},
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_updateOpacity: function () {
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L.DomUtil.setOpacity(this._canvas, this.options.opacity);
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},
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__format_lat: function(lat) {
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if (this.options.latFormatTickLabel) {
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return this.options.latFormatTickLabel(lat);
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}
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// todo: format type of float
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if (lat < 0) {
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return '' + (lat*-1) + this.options.sides[1];
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}
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else if (lat > 0) {
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return '' + lat + this.options.sides[0];
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}
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return '' + lat;
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},
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__format_lng: function(lng) {
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if (this.options.lngFormatTickLabel) {
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return this.options.lngFormatTickLabel(lng);
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}
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// todo: format type of float
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if (lng > 180) {
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return '' + (360 - lng) + this.options.sides[3];
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}
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else if (lng > 0 && lng < 180) {
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return '' + lng + this.options.sides[2];
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}
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else if (lng < 0 && lng > -180) {
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return '' + (lng*-1) + this.options.sides[3];
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}
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else if (lng == -180) {
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return '' + (lng*-1);
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}
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else if (lng < -180) {
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return '' + (360 + lng) + this.options.sides[3];
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}
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return '' + lng;
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},
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__calcInterval: function() {
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var zoom = this._map.getZoom();
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if (this._currZoom != zoom) {
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this._currLngInterval = 0;
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this._currLatInterval = 0;
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this._currZoom = zoom;
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}
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var interv;
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if (!this._currLngInterval) {
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try {
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for (var idx in this.options.lngInterval) {
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var dict = this.options.lngInterval[idx];
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if (dict.start <= zoom) {
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if (dict.end && dict.end >= zoom) {
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this._currLngInterval = dict.interval;
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break;
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}
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}
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}
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}
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catch(e) {
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this._currLngInterval = 0;
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}
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}
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if (!this._currLatInterval) {
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try {
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for (var idx in this.options.latInterval) {
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var dict = this.options.latInterval[idx];
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if (dict.start <= zoom) {
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if (dict.end && dict.end >= zoom) {
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this._currLatInterval = dict.interval;
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break;
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}
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}
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}
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}
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catch(e) {
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this._currLatInterval = 0;
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}
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}
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},
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__draw: function(label) {
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function _parse_px_to_int(txt) {
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if (txt.length > 2) {
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if (txt.charAt(txt.length-2) == 'p') {
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txt = txt.substr(0, txt.length-2);
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}
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}
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try {
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return parseInt(txt, 10);
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}
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catch(e) {}
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return 0;
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};
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var self = this,
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canvas = this._canvas,
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map = this._map,
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curvedLon = this.options.lngLineCurved,
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curvedLat = this.options.latLineCurved;
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if (L.Browser.canvas && map) {
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if (!this._currLngInterval || !this._currLatInterval) {
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this.__calcInterval();
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}
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var latInterval = this._currLatInterval,
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lngInterval = this._currLngInterval;
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var ctx = canvas.getContext('2d');
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.lineWidth = this.options.weight;
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ctx.strokeStyle = this.options.color;
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ctx.fillStyle = this.options.fontColor;
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ctx.setLineDash(this.options.dashArray);
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if (this.options.font) {
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ctx.font = this.options.font;
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}
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var txtWidth = ctx.measureText('0').width;
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var txtHeight = 12;
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try {
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var _font_size = ctx.font.trim().split(' ')[0];
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txtHeight = _parse_px_to_int(_font_size);
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}
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catch(e) {}
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var ww = canvas.width,
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hh = canvas.height;
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var lt = map.containerPointToLatLng(L.point(0, 0));
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var rt = map.containerPointToLatLng(L.point(ww, 0));
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var rb = map.containerPointToLatLng(L.point(ww, hh));
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var _lat_b = rb.lat,
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_lat_t = lt.lat;
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var _lon_l = lt.lng,
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_lon_r = rt.lng;
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var _point_per_lat = (_lat_t - _lat_b) / (hh * 0.2);
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if (isNaN(_point_per_lat)) {
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return;
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}
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if (_point_per_lat < 1) { _point_per_lat = 1; }
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if (_lat_b < -90) {
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_lat_b = -90;
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}
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else {
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_lat_b = parseInt(_lat_b - _point_per_lat, 10);
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}
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if (_lat_t > 90) {
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_lat_t = 90;
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}
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else {
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_lat_t = parseInt(_lat_t + _point_per_lat, 10);
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}
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var _point_per_lon = (_lon_r - _lon_l) / (ww * 0.2);
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if (_point_per_lon < 1) { _point_per_lon = 1; }
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if (_lon_l > 0 && _lon_r < 0) {
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_lon_r += 360;
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}
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_lon_r = parseInt(_lon_r + _point_per_lon, 10);
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_lon_l = parseInt(_lon_l - _point_per_lon, 10);
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var ll, latstr, lngstr, _lon_delta = 0.5;
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function __draw_lat_line(self, lat_tick) {
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ll = self._latLngToCanvasPoint(L.latLng(lat_tick, _lon_l));
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latstr = self.__format_lat(lat_tick);
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txtWidth = ctx.measureText(latstr).width;
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var spacer = self.options.showLabel && label ? txtWidth + 10 : 0;
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if (curvedLat) {
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if (typeof(curvedLat) == 'number') {
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_lon_delta = curvedLat;
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}
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var __lon_left = _lon_l, __lon_right = _lon_r;
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if (ll.x > 0) {
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var __lon_left = map.containerPointToLatLng(L.point(0, ll.y));
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__lon_left = __lon_left.lng - _point_per_lon;
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ll.x = 0;
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}
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var rr = self._latLngToCanvasPoint(L.latLng(lat_tick, __lon_right));
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if (rr.x < ww) {
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__lon_right = map.containerPointToLatLng(L.point(ww, rr.y));
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__lon_right = __lon_right.lng + _point_per_lon;
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if (__lon_left > 0 && __lon_right < 0) {
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__lon_right += 360;
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}
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}
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ctx.beginPath();
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ctx.moveTo(ll.x + spacer, ll.y);
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var _prev_p = null;
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for (var j=__lon_left; j<=__lon_right; j+=_lon_delta) {
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rr = self._latLngToCanvasPoint(L.latLng(lat_tick, j));
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ctx.lineTo(rr.x - spacer, rr.y);
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if (self.options.showLabel && label && _prev_p != null) {
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if (_prev_p.x < 0 && rr.x >= 0) {
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var _s = (rr.x - 0) / (rr.x - _prev_p.x);
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var _y = rr.y - ((rr.y - _prev_p.y) * _s);
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ctx.fillText(latstr, 0, _y + (txtHeight/2));
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}
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else if (_prev_p.x <= (ww-txtWidth) && rr.x > (ww-txtWidth)) {
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var _s = (rr.x - ww) / (rr.x - _prev_p.x);
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var _y = rr.y - ((rr.y - _prev_p.y) * _s);
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ctx.fillText(latstr, ww-txtWidth, _y + (txtHeight/2)-2);
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}
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}
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_prev_p = {x:rr.x, y:rr.y, lon:j, lat:i};
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}
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ctx.stroke();
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}
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else {
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var __lon_right = _lon_r;
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var rr = self._latLngToCanvasPoint(L.latLng(lat_tick, __lon_right));
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if (curvedLon) {
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__lon_right = map.containerPointToLatLng(L.point(0, rr.y));
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__lon_right = __lon_right.lng;
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rr = self._latLngToCanvasPoint(L.latLng(lat_tick, __lon_right));
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var __lon_left = map.containerPointToLatLng(L.point(ww, rr.y));
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__lon_left = __lon_left.lng;
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ll = self._latLngToCanvasPoint(L.latLng(lat_tick, __lon_left));
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}
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ctx.beginPath();
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ctx.moveTo(1 + spacer, ll.y);
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ctx.lineTo(rr.x-1 - spacer, rr.y);
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ctx.stroke();
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if (self.options.showLabel && label) {
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var _yy = ll.y + (txtHeight/2)-2;
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ctx.fillText(latstr, 0, _yy);
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ctx.fillText(latstr, ww-txtWidth, _yy);
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}
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}
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};
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if (latInterval > 0) {
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for (var i=latInterval; i<=_lat_t; i+=latInterval) {
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if (i >= _lat_b) {
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__draw_lat_line(this, i);
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}
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}
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for (var i=0; i>=_lat_b; i-=latInterval) {
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if (i <= _lat_t) {
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__draw_lat_line(this, i);
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}
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}
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}
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function __draw_lon_line(self, lon_tick) {
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lngstr = self.__format_lng(lon_tick);
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txtWidth = ctx.measureText(lngstr).width;
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var bb = self._latLngToCanvasPoint(L.latLng(_lat_b, lon_tick));
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var spacer = self.options.showLabel && label ? txtHeight + 5 : 0;
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if (curvedLon) {
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if (typeof(curvedLon) == 'number') {
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_lat_delta = curvedLon;
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}
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ctx.beginPath();
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ctx.moveTo(bb.x, 5 + spacer);
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var _prev_p = null;
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for (var j=_lat_b; j<_lat_t; j+=_lat_delta) {
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var tt = self._latLngToCanvasPoint(L.latLng(j, lon_tick));
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ctx.lineTo(tt.x, tt.y - spacer);
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if (self.options.showLabel && label && _prev_p != null) {
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if (_prev_p.y > 8 && tt.y <= 8) {
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ctx.fillText(lngstr, tt.x - (txtWidth/2), txtHeight + 5);
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}
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else if (_prev_p.y >= hh && tt.y < hh) {
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ctx.fillText(lngstr, tt.x - (txtWidth/2), hh-2);
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}
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}
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_prev_p = {x:tt.x, y:tt.y, lon:lon_tick, lat:j};
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}
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ctx.stroke();
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}
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else {
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var __lat_top = _lat_t;
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var tt = self._latLngToCanvasPoint(L.latLng(__lat_top, lon_tick));
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if (curvedLat) {
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__lat_top = map.containerPointToLatLng(L.point(tt.x, 0));
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__lat_top = __lat_top.lat;
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if (__lat_top > 90) { __lat_top = 90; }
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tt = self._latLngToCanvasPoint(L.latLng(__lat_top, lon_tick));
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var __lat_bottom = map.containerPointToLatLng(L.point(bb.x, hh));
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__lat_bottom = __lat_bottom.lat;
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if (__lat_bottom < -90) { __lat_bottom = -90; }
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bb = self._latLngToCanvasPoint(L.latLng(__lat_bottom, lon_tick));
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}
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ctx.beginPath();
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ctx.moveTo(tt.x, 5 + spacer);
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ctx.lineTo(bb.x, hh-1 - spacer);
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ctx.stroke();
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if (self.options.showLabel && label) {
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ctx.fillText(lngstr, tt.x - (txtWidth/2), txtHeight+5);
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ctx.fillText(lngstr, bb.x - (txtWidth/2), hh-3);
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}
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}
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};
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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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
_latLngToCanvasPoint: function(latlng) {
|
|
var map = this._map;
|
|
var projectedPoint = map.project(L.latLng(latlng));
|
|
projectedPoint._subtract(map.getPixelOrigin());
|
|
return L.point(projectedPoint).add(map._getMapPanePos());
|
|
}
|
|
|
|
});
|
|
|
|
L.latlngGraticule = function (options) {
|
|
return new L.LatLngGraticule(options);
|
|
};
|
|
|
|
|
|
}(this, document));
|