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272 righe
7.6 KiB
272 righe
7.6 KiB
(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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if (proj4.__esModule && proj4.default) { |
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// If proj4 was bundled as an ES6 module, unwrap it to get |
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// to the actual main proj4 object. |
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// See discussion in https://github.com/kartena/Proj4Leaflet/pull/147 |
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proj4 = proj4.default; |
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} |
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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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if (downScale === undefined) { |
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return -Infinity; |
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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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