264 lines
7.3 KiB
JavaScript
264 lines
7.3 KiB
JavaScript
(function (factory) {
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var L, proj4;
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if (typeof define === 'function' && define.amd) {
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// AMD
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define(['leaflet', 'proj4'], factory);
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} else if (typeof module === 'object' && typeof module.exports === "object") {
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// Node/CommonJS
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L = require('leaflet');
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proj4 = require('proj4');
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module.exports = factory(L, proj4);
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} else {
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// Browser globals
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if (typeof window.L === 'undefined' || typeof window.proj4 === 'undefined')
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throw 'Leaflet and proj4 must be loaded first';
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factory(window.L, window.proj4);
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}
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}(function (L, proj4) {
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L.Proj = {};
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L.Proj._isProj4Obj = function(a) {
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return (typeof a.inverse !== 'undefined' &&
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typeof a.forward !== 'undefined');
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};
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L.Proj.Projection = L.Class.extend({
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initialize: function(code, def, bounds) {
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var isP4 = L.Proj._isProj4Obj(code);
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this._proj = isP4 ? code : this._projFromCodeDef(code, def);
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this.bounds = isP4 ? def : bounds;
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},
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project: function (latlng) {
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var point = this._proj.forward([latlng.lng, latlng.lat]);
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return new L.Point(point[0], point[1]);
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},
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unproject: function (point, unbounded) {
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var point2 = this._proj.inverse([point.x, point.y]);
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return new L.LatLng(point2[1], point2[0], unbounded);
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},
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_projFromCodeDef: function(code, def) {
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if (def) {
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proj4.defs(code, def);
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} else if (proj4.defs[code] === undefined) {
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var urn = code.split(':');
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if (urn.length > 3) {
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code = urn[urn.length - 3] + ':' + urn[urn.length - 1];
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}
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if (proj4.defs[code] === undefined) {
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throw 'No projection definition for code ' + code;
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}
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}
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return proj4(code);
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}
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});
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L.Proj.CRS = L.Class.extend({
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includes: L.CRS,
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options: {
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transformation: new L.Transformation(1, 0, -1, 0)
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},
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initialize: function(a, b, c) {
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var code,
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proj,
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def,
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options;
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if (L.Proj._isProj4Obj(a)) {
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proj = a;
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code = proj.srsCode;
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options = b || {};
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this.projection = new L.Proj.Projection(proj, options.bounds);
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} else {
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code = a;
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def = b;
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options = c || {};
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this.projection = new L.Proj.Projection(code, def, options.bounds);
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}
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L.Util.setOptions(this, options);
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this.code = code;
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this.transformation = this.options.transformation;
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if (this.options.origin) {
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this.transformation =
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new L.Transformation(1, -this.options.origin[0],
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-1, this.options.origin[1]);
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}
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if (this.options.scales) {
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this._scales = this.options.scales;
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} else if (this.options.resolutions) {
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this._scales = [];
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for (var i = this.options.resolutions.length - 1; i >= 0; i--) {
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if (this.options.resolutions[i]) {
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this._scales[i] = 1 / this.options.resolutions[i];
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}
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}
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}
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this.infinite = !this.options.bounds;
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},
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scale: function(zoom) {
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var iZoom = Math.floor(zoom),
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baseScale,
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nextScale,
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scaleDiff,
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zDiff;
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if (zoom === iZoom) {
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return this._scales[zoom];
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} else {
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// Non-integer zoom, interpolate
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baseScale = this._scales[iZoom];
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nextScale = this._scales[iZoom + 1];
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scaleDiff = nextScale - baseScale;
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zDiff = (zoom - iZoom);
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return baseScale + scaleDiff * zDiff;
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}
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},
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zoom: function(scale) {
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// Find closest number in this._scales, down
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var downScale = this._closestElement(this._scales, scale),
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downZoom = this._scales.indexOf(downScale),
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nextScale,
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nextZoom,
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scaleDiff;
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// Check if scale is downScale => return array index
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if (scale === downScale) {
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return downZoom;
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}
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// Interpolate
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nextZoom = downZoom + 1;
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nextScale = this._scales[nextZoom];
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if (nextScale === undefined) {
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return Infinity;
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}
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scaleDiff = nextScale - downScale;
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return (scale - downScale) / scaleDiff + downZoom;
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},
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distance: L.CRS.Earth.distance,
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R: L.CRS.Earth.R,
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/* Get the closest lowest element in an array */
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_closestElement: function(array, element) {
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var low;
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for (var i = array.length; i--;) {
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if (array[i] <= element && (low === undefined || low < array[i])) {
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low = array[i];
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}
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}
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return low;
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}
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});
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L.Proj.GeoJSON = L.GeoJSON.extend({
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initialize: function(geojson, options) {
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this._callLevel = 0;
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L.GeoJSON.prototype.initialize.call(this, geojson, options);
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},
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addData: function(geojson) {
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var crs;
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if (geojson) {
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if (geojson.crs && geojson.crs.type === 'name') {
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crs = new L.Proj.CRS(geojson.crs.properties.name);
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} else if (geojson.crs && geojson.crs.type) {
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crs = new L.Proj.CRS(geojson.crs.type + ':' + geojson.crs.properties.code);
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}
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if (crs !== undefined) {
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this.options.coordsToLatLng = function(coords) {
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var point = L.point(coords[0], coords[1]);
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return crs.projection.unproject(point);
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};
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}
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}
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// Base class' addData might call us recursively, but
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// CRS shouldn't be cleared in that case, since CRS applies
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// to the whole GeoJSON, inluding sub-features.
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this._callLevel++;
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try {
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L.GeoJSON.prototype.addData.call(this, geojson);
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} finally {
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this._callLevel--;
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if (this._callLevel === 0) {
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delete this.options.coordsToLatLng;
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}
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}
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}
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});
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L.Proj.geoJson = function(geojson, options) {
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return new L.Proj.GeoJSON(geojson, options);
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};
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L.Proj.ImageOverlay = L.ImageOverlay.extend({
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initialize: function (url, bounds, options) {
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L.ImageOverlay.prototype.initialize.call(this, url, null, options);
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this._projectedBounds = bounds;
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},
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// Danger ahead: Overriding internal methods in Leaflet.
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// Decided to do this rather than making a copy of L.ImageOverlay
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// and doing very tiny modifications to it.
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// Future will tell if this was wise or not.
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_animateZoom: function (event) {
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var scale = this._map.getZoomScale(event.zoom);
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var northWest = L.point(this._projectedBounds.min.x, this._projectedBounds.max.y);
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var offset = this._projectedToNewLayerPoint(northWest, event.zoom, event.center);
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L.DomUtil.setTransform(this._image, offset, scale);
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},
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_reset: function () {
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var zoom = this._map.getZoom();
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var pixelOrigin = this._map.getPixelOrigin();
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var bounds = L.bounds(
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this._transform(this._projectedBounds.min, zoom)._subtract(pixelOrigin),
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this._transform(this._projectedBounds.max, zoom)._subtract(pixelOrigin)
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);
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var size = bounds.getSize();
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L.DomUtil.setPosition(this._image, bounds.min);
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this._image.style.width = size.x + 'px';
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this._image.style.height = size.y + 'px';
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},
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_projectedToNewLayerPoint: function (point, zoom, center) {
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var viewHalf = this._map.getSize()._divideBy(2);
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var newTopLeft = this._map.project(center, zoom)._subtract(viewHalf)._round();
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var topLeft = newTopLeft.add(this._map._getMapPanePos());
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return this._transform(point, zoom)._subtract(topLeft);
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},
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_transform: function (point, zoom) {
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var crs = this._map.options.crs;
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var transformation = crs.transformation;
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var scale = crs.scale(zoom);
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return transformation.transform(point, scale);
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}
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});
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L.Proj.imageOverlay = function (url, bounds, options) {
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return new L.Proj.ImageOverlay(url, bounds, options);
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};
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return L.Proj;
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}));
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