271 lines
7.9 KiB
Vue
271 lines
7.9 KiB
Vue
(function(factory) {
|
|
var L, proj4;
|
|
if (typeof define === 'function' && define.amd) {
|
|
// AMD
|
|
define(['leaflet', 'proj4'], factory);
|
|
} else if (typeof module === 'object' && typeof module.exports === 'object') {
|
|
// Node/CommonJS
|
|
L = require('leaflet');
|
|
proj4 = require('proj4');
|
|
module.exports = factory(L, proj4);
|
|
} else {
|
|
// Browser globals
|
|
if (typeof window.L === 'undefined' || typeof window.proj4 === 'undefined') { throw 'Leaflet and proj4 must be loaded first'; }
|
|
factory(window.L, window.proj4);
|
|
}
|
|
}(function(L, proj4) {
|
|
if (proj4.__esModule && proj4.default) {
|
|
// If proj4 was bundled as an ES6 module, unwrap it to get
|
|
// to the actual main proj4 object.
|
|
// See discussion in https://github.com/kartena/Proj4Leaflet/pull/147
|
|
proj4 = proj4.default;
|
|
}
|
|
|
|
L.Proj = {};
|
|
|
|
L.Proj._isProj4Obj = function(a) {
|
|
return (typeof a.inverse !== 'undefined' &&
|
|
typeof a.forward !== 'undefined');
|
|
};
|
|
|
|
L.Proj.Projection = L.Class.extend({
|
|
initialize: function(code, def, bounds) {
|
|
var isP4 = L.Proj._isProj4Obj(code);
|
|
this._proj = isP4 ? code : this._projFromCodeDef(code, def);
|
|
this.bounds = isP4 ? def : bounds;
|
|
},
|
|
|
|
project: function(latlng) {
|
|
var point = this._proj.forward([latlng.lng, latlng.lat]);
|
|
return new L.Point(point[0], point[1]);
|
|
},
|
|
|
|
unproject: function(point, unbounded) {
|
|
var point2 = this._proj.inverse([point.x, point.y]);
|
|
return new L.LatLng(point2[1], point2[0], unbounded);
|
|
},
|
|
|
|
_projFromCodeDef: function(code, def) {
|
|
if (def) {
|
|
proj4.defs(code, def);
|
|
} else if (proj4.defs[code] === undefined) {
|
|
var urn = code.split(':');
|
|
if (urn.length > 3) {
|
|
code = urn[urn.length - 3] + ':' + urn[urn.length - 1];
|
|
}
|
|
if (proj4.defs[code] === undefined) {
|
|
throw 'No projection definition for code ' + code;
|
|
}
|
|
}
|
|
|
|
return proj4(code);
|
|
}
|
|
});
|
|
|
|
L.Proj.CRS = L.Class.extend({
|
|
includes: L.CRS,
|
|
|
|
options: {
|
|
transformation: new L.Transformation(1, 0, -1, 0)
|
|
},
|
|
|
|
initialize: function(a, b, c) {
|
|
var code,
|
|
proj,
|
|
def,
|
|
options;
|
|
|
|
if (L.Proj._isProj4Obj(a)) {
|
|
proj = a;
|
|
code = proj.srsCode;
|
|
options = b || {};
|
|
|
|
this.projection = new L.Proj.Projection(proj, options.bounds);
|
|
} else {
|
|
code = a;
|
|
def = b;
|
|
options = c || {};
|
|
this.projection = new L.Proj.Projection(code, def, options.bounds);
|
|
}
|
|
|
|
L.Util.setOptions(this, options);
|
|
this.code = code;
|
|
this.transformation = this.options.transformation;
|
|
|
|
if (this.options.origin) {
|
|
this.transformation =
|
|
new L.Transformation(1, -this.options.origin[0],
|
|
-1, this.options.origin[1]);
|
|
}
|
|
|
|
if (this.options.scales) {
|
|
this._scales = this.options.scales;
|
|
} else if (this.options.resolutions) {
|
|
this._scales = [];
|
|
for (var i = this.options.resolutions.length - 1; i >= 0; i--) {
|
|
if (this.options.resolutions[i]) {
|
|
this._scales[i] = 1 / this.options.resolutions[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
this.infinite = !this.options.bounds;
|
|
},
|
|
|
|
scale: function(zoom) {
|
|
var iZoom = Math.floor(zoom);
|
|
var baseScale;
|
|
var nextScale;
|
|
var scaleDiff;
|
|
var zDiff;
|
|
if (zoom === iZoom) {
|
|
return this._scales[zoom];
|
|
} else {
|
|
// Non-integer zoom, interpolate
|
|
baseScale = this._scales[iZoom];
|
|
nextScale = this._scales[iZoom + 1];
|
|
scaleDiff = nextScale - baseScale;
|
|
zDiff = (zoom - iZoom);
|
|
return baseScale + scaleDiff * zDiff;
|
|
}
|
|
},
|
|
|
|
zoom: function(scale) {
|
|
// Find closest number in this._scales, down
|
|
var downScale = this._closestElement(this._scales, scale);
|
|
var downZoom = this._scales.indexOf(downScale);
|
|
var nextScale;
|
|
var nextZoom;
|
|
var scaleDiff;
|
|
// Check if scale is downScale => return array index
|
|
if (scale === downScale) {
|
|
return downZoom;
|
|
}
|
|
if (downScale === undefined) {
|
|
return -Infinity;
|
|
}
|
|
// Interpolate
|
|
nextZoom = downZoom + 1;
|
|
nextScale = this._scales[nextZoom];
|
|
if (nextScale === undefined) {
|
|
return Infinity;
|
|
}
|
|
scaleDiff = nextScale - downScale;
|
|
return (scale - downScale) / scaleDiff + downZoom;
|
|
},
|
|
|
|
distance: L.CRS.Earth.distance,
|
|
|
|
R: L.CRS.Earth.R,
|
|
|
|
/* Get the closest lowest element in an array */
|
|
_closestElement: function(array, element) {
|
|
var low;
|
|
for (var i = array.length; i--;) {
|
|
if (array[i] <= element && (low === undefined || low < array[i])) {
|
|
low = array[i];
|
|
}
|
|
}
|
|
return low;
|
|
}
|
|
});
|
|
|
|
L.Proj.GeoJSON = L.GeoJSON.extend({
|
|
initialize: function(geojson, options) {
|
|
this._callLevel = 0;
|
|
L.GeoJSON.prototype.initialize.call(this, geojson, options);
|
|
},
|
|
|
|
addData: function(geojson) {
|
|
var crs;
|
|
|
|
if (geojson) {
|
|
if (geojson.crs && geojson.crs.type === 'name') {
|
|
crs = new L.Proj.CRS(geojson.crs.properties.name);
|
|
} else if (geojson.crs && geojson.crs.type) {
|
|
crs = new L.Proj.CRS(geojson.crs.type + ':' + geojson.crs.properties.code);
|
|
}
|
|
|
|
if (crs !== undefined) {
|
|
this.options.coordsToLatLng = function(coords) {
|
|
var point = L.point(coords[0], coords[1]);
|
|
return crs.projection.unproject(point);
|
|
};
|
|
}
|
|
}
|
|
|
|
// Base class' addData might call us recursively, but
|
|
// CRS shouldn't be cleared in that case, since CRS applies
|
|
// to the whole GeoJSON, inluding sub-features.
|
|
this._callLevel++;
|
|
try {
|
|
L.GeoJSON.prototype.addData.call(this, geojson);
|
|
} finally {
|
|
this._callLevel--;
|
|
if (this._callLevel === 0) {
|
|
delete this.options.coordsToLatLng;
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
L.Proj.geoJson = function(geojson, options) {
|
|
return new L.Proj.GeoJSON(geojson, options);
|
|
};
|
|
|
|
L.Proj.ImageOverlay = L.ImageOverlay.extend({
|
|
initialize: function(url, bounds, options) {
|
|
L.ImageOverlay.prototype.initialize.call(this, url, null, options);
|
|
this._projectedBounds = bounds;
|
|
},
|
|
|
|
// Danger ahead: Overriding internal methods in Leaflet.
|
|
// Decided to do this rather than making a copy of L.ImageOverlay
|
|
// and doing very tiny modifications to it.
|
|
// Future will tell if this was wise or not.
|
|
_animateZoom: function(event) {
|
|
var scale = this._map.getZoomScale(event.zoom);
|
|
var northWest = L.point(this._projectedBounds.min.x, this._projectedBounds.max.y);
|
|
var offset = this._projectedToNewLayerPoint(northWest, event.zoom, event.center);
|
|
|
|
L.DomUtil.setTransform(this._image, offset, scale);
|
|
},
|
|
|
|
_reset: function() {
|
|
var zoom = this._map.getZoom();
|
|
var pixelOrigin = this._map.getPixelOrigin();
|
|
var bounds = L.bounds(
|
|
this._transform(this._projectedBounds.min, zoom)._subtract(pixelOrigin),
|
|
this._transform(this._projectedBounds.max, zoom)._subtract(pixelOrigin)
|
|
);
|
|
var size = bounds.getSize();
|
|
|
|
L.DomUtil.setPosition(this._image, bounds.min);
|
|
this._image.style.width = size.x + 'px';
|
|
this._image.style.height = size.y + 'px';
|
|
},
|
|
|
|
_projectedToNewLayerPoint: function(point, zoom, center) {
|
|
var viewHalf = this._map.getSize()._divideBy(2);
|
|
var newTopLeft = this._map.project(center, zoom)._subtract(viewHalf)._round();
|
|
var topLeft = newTopLeft.add(this._map._getMapPanePos());
|
|
|
|
return this._transform(point, zoom)._subtract(topLeft);
|
|
},
|
|
|
|
_transform: function(point, zoom) {
|
|
var crs = this._map.options.crs;
|
|
var transformation = crs.transformation;
|
|
var scale = crs.scale(zoom);
|
|
|
|
return transformation.transform(point, scale);
|
|
}
|
|
});
|
|
|
|
L.Proj.imageOverlay = function(url, bounds, options) {
|
|
return new L.Proj.ImageOverlay(url, bounds, options);
|
|
};
|
|
|
|
return L.Proj;
|
|
}));
|