700 lines
21 KiB
JavaScript
700 lines
21 KiB
JavaScript
goog.provide('ol.proj');
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goog.provide('ol.proj.METERS_PER_UNIT');
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goog.provide('ol.proj.Projection');
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goog.provide('ol.proj.ProjectionLike');
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goog.provide('ol.proj.Units');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.object');
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goog.require('ol');
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goog.require('ol.Extent');
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goog.require('ol.TransformFunction');
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goog.require('ol.extent');
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goog.require('ol.sphere.NORMAL');
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/**
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* A projection as {@link ol.proj.Projection}, SRS identifier string or
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* undefined.
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* @typedef {ol.proj.Projection|string|undefined} ol.proj.ProjectionLike
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* @api
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*/
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ol.proj.ProjectionLike;
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/**
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* Projection units: `'degrees'`, `'ft'`, `'m'` or `'pixels'`.
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* @enum {string}
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* @api
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*/
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ol.proj.Units = {
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DEGREES: 'degrees',
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FEET: 'ft',
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METERS: 'm',
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PIXELS: 'pixels'
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};
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/**
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* Meters per unit lookup table.
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* @const
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* @type {Object.<ol.proj.Units, number>}
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* @api
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*/
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ol.proj.METERS_PER_UNIT = {};
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ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] =
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2 * Math.PI * ol.sphere.NORMAL.radius / 360;
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ol.proj.METERS_PER_UNIT[ol.proj.Units.FEET] = 0.3048;
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ol.proj.METERS_PER_UNIT[ol.proj.Units.METERS] = 1;
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/**
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* @classdesc
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* Projection definition class. One of these is created for each projection
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* supported in the application and stored in the {@link ol.proj} namespace.
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* You can use these in applications, but this is not required, as API params
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* and options use {@link ol.proj.ProjectionLike} which means the simple string
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* code will suffice.
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*
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* You can use {@link ol.proj.get} to retrieve the object for a particular
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* projection.
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*
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* @constructor
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* @param {olx.ProjectionOptions} options Projection options.
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* @struct
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* @api
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*/
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ol.proj.Projection = function(options) {
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/**
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* @private
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* @type {string}
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*/
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this.code_ = options.code;
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/**
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* @private
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* @type {ol.proj.Units}
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*/
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this.units_ = /** @type {ol.proj.Units} */ (options.units);
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.extent_ = goog.isDef(options.extent) ? options.extent : null;
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.worldExtent_ = goog.isDef(options.worldExtent) ?
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options.worldExtent : null;
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/**
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* @private
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* @type {string}
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*/
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this.axisOrientation_ = goog.isDef(options.axisOrientation) ?
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options.axisOrientation : 'enu';
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/**
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* @private
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* @type {boolean}
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*/
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this.global_ = goog.isDef(options.global) ? options.global : false;
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/**
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* @private
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* @type {ol.tilegrid.TileGrid}
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*/
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this.defaultTileGrid_ = null;
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};
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/**
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* Get the code for this projection, e.g. 'EPSG:4326'.
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* @return {string} Code.
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* @api
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*/
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ol.proj.Projection.prototype.getCode = function() {
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return this.code_;
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};
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/**
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* Get the validity extent for this projection.
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* @return {ol.Extent} Extent.
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* @api
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*/
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ol.proj.Projection.prototype.getExtent = function() {
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return this.extent_;
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};
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/**
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* Get the units of this projection.
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* @return {ol.proj.Units} Units.
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* @api
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*/
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ol.proj.Projection.prototype.getUnits = function() {
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return this.units_;
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};
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/**
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* Get the amount of meters per unit of this projection. If the projection is
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* not configured with a units identifier, the return is `undefined`.
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* @return {number|undefined} Meters.
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*/
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ol.proj.Projection.prototype.getMetersPerUnit = function() {
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return ol.proj.METERS_PER_UNIT[this.units_];
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};
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/**
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* Get the world extent for this projection.
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* @return {ol.Extent} Extent.
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* @api
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*/
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ol.proj.Projection.prototype.getWorldExtent = function() {
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return this.worldExtent_;
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};
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/**
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* Get the axis orientation of this projection.
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* Example values are:
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* enu - the default easting, northing, elevation.
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* neu - northing, easting, up - useful for "lat/long" geographic coordinates,
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* or south orientated transverse mercator.
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* wnu - westing, northing, up - some planetary coordinate systems have
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* "west positive" coordinate systems
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* @return {string} Axis orientation.
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*/
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ol.proj.Projection.prototype.getAxisOrientation = function() {
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return this.axisOrientation_;
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};
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/**
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* Is this projection a global projection which spans the whole world?
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* @return {boolean} Wether the projection is global.
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*/
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ol.proj.Projection.prototype.isGlobal = function() {
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return this.global_;
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};
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/**
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* @return {ol.tilegrid.TileGrid} The default tile grid.
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*/
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ol.proj.Projection.prototype.getDefaultTileGrid = function() {
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return this.defaultTileGrid_;
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};
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/**
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* @param {ol.tilegrid.TileGrid} tileGrid The default tile grid.
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*/
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ol.proj.Projection.prototype.setDefaultTileGrid = function(tileGrid) {
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this.defaultTileGrid_ = tileGrid;
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};
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/**
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* Set the validity extent for this projection.
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* @param {ol.Extent} extent Extent.
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* @api
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*/
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ol.proj.Projection.prototype.setExtent = function(extent) {
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this.extent_ = extent;
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};
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/**
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* Set the world extent for this projection.
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* @param {ol.Extent} worldExtent World extent
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* [minlon, minlat, maxlon, maxlat].
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* @api
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*/
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ol.proj.Projection.prototype.setWorldExtent = function(worldExtent) {
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this.worldExtent_ = worldExtent;
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};
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/**
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* Get the resolution of the point in degrees. For projections with degrees as
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* the unit this will simply return the provided resolution. For other
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* projections the point resolution is estimated by transforming the center
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* pixel to EPSG:4326, measuring its width and height on the normal sphere,
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* and taking the average of the width and height.
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* @param {number} resolution Resolution.
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* @param {ol.Coordinate} point Point.
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* @return {number} Point resolution.
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*/
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ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
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if (this.getUnits() == ol.proj.Units.DEGREES) {
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return resolution;
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} else {
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// Estimate point resolution by transforming the center pixel to EPSG:4326,
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// measuring its width and height on the normal sphere, and taking the
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// average of the width and height.
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var toEPSG4326 = ol.proj.getTransformFromProjections(
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this, ol.proj.get('EPSG:4326'));
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var vertices = [
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point[0] - resolution / 2, point[1],
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point[0] + resolution / 2, point[1],
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point[0], point[1] - resolution / 2,
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point[0], point[1] + resolution / 2
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];
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vertices = toEPSG4326(vertices, vertices, 2);
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var width = ol.sphere.NORMAL.haversineDistance(
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vertices.slice(0, 2), vertices.slice(2, 4));
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var height = ol.sphere.NORMAL.haversineDistance(
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vertices.slice(4, 6), vertices.slice(6, 8));
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var pointResolution = (width + height) / 2;
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if (this.getUnits() == ol.proj.Units.FEET) {
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// The radius of the normal sphere is defined in meters, so we must
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// convert back to feet.
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pointResolution /= 0.3048;
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}
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return pointResolution;
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}
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};
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/**
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* @private
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* @type {Object.<string, ol.proj.Projection>}
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*/
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ol.proj.projections_ = {};
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/**
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* @private
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* @type {Object.<string, Object.<string, ol.TransformFunction>>}
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*/
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ol.proj.transforms_ = {};
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/**
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* Registers transformation functions that don't alter coordinates. Those allow
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* to transform between projections with equal meaning.
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*
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* @param {Array.<ol.proj.Projection>} projections Projections.
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* @api
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*/
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ol.proj.addEquivalentProjections = function(projections) {
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ol.proj.addProjections(projections);
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goog.array.forEach(projections, function(source) {
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goog.array.forEach(projections, function(destination) {
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if (source !== destination) {
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ol.proj.addTransform(source, destination, ol.proj.cloneTransform);
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}
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});
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});
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};
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/**
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* Registers transformation functions to convert coordinates in any projection
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* in projection1 to any projection in projection2.
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*
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* @param {Array.<ol.proj.Projection>} projections1 Projections with equal
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* meaning.
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* @param {Array.<ol.proj.Projection>} projections2 Projections with equal
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* meaning.
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* @param {ol.TransformFunction} forwardTransform Transformation from any
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* projection in projection1 to any projection in projection2.
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* @param {ol.TransformFunction} inverseTransform Transform from any projection
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* in projection2 to any projection in projection1..
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*/
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ol.proj.addEquivalentTransforms =
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function(projections1, projections2, forwardTransform, inverseTransform) {
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goog.array.forEach(projections1, function(projection1) {
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goog.array.forEach(projections2, function(projection2) {
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ol.proj.addTransform(projection1, projection2, forwardTransform);
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ol.proj.addTransform(projection2, projection1, inverseTransform);
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});
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});
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};
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/**
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* Add a Projection object to the list of supported projections.
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*
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* @param {ol.proj.Projection} projection Projection instance.
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* @api
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*/
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ol.proj.addProjection = function(projection) {
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ol.proj.projections_[projection.getCode()] = projection;
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ol.proj.addTransform(projection, projection, ol.proj.cloneTransform);
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};
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/**
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* @param {Array.<ol.proj.Projection>} projections Projections.
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*/
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ol.proj.addProjections = function(projections) {
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var addedProjections = [];
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goog.array.forEach(projections, function(projection) {
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addedProjections.push(ol.proj.addProjection(projection));
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});
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};
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/**
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* FIXME empty description for jsdoc
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*/
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ol.proj.clearAllProjections = function() {
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ol.proj.projections_ = {};
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ol.proj.transforms_ = {};
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};
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/**
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* @param {ol.proj.Projection|string|undefined} projection Projection.
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* @param {string} defaultCode Default code.
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* @return {ol.proj.Projection} Projection.
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*/
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ol.proj.createProjection = function(projection, defaultCode) {
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if (!goog.isDefAndNotNull(projection)) {
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return ol.proj.get(defaultCode);
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} else if (goog.isString(projection)) {
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return ol.proj.get(projection);
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} else {
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goog.asserts.assertInstanceof(projection, ol.proj.Projection);
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return projection;
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}
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};
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/**
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* Registers a conversion function to convert coordinates from the source
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* projection to the destination projection.
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*
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* @param {ol.proj.Projection} source Source.
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* @param {ol.proj.Projection} destination Destination.
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* @param {ol.TransformFunction} transformFn Transform.
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*/
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ol.proj.addTransform = function(source, destination, transformFn) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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var transforms = ol.proj.transforms_;
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if (!goog.object.containsKey(transforms, sourceCode)) {
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transforms[sourceCode] = {};
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}
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transforms[sourceCode][destinationCode] = transformFn;
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};
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/**
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* Registers coordinate transform functions to convert coordinates between the
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* source projection and the destination projection.
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* The forward and inverse functions convert coordinate pairs; this function
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* converts these into the functions used internally which also handle
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* extents and coordinate arrays.
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*
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* @param {ol.proj.ProjectionLike} source Source projection.
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* @param {ol.proj.ProjectionLike} destination Destination projection.
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* @param {function(ol.Coordinate): ol.Coordinate} forward The forward transform
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* function (that is, from the source projection to the destination
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* projection) that takes a {@link ol.Coordinate} as argument and returns
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* the transformed {@link ol.Coordinate}.
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* @param {function(ol.Coordinate): ol.Coordinate} inverse The inverse transform
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* function (that is, from the destination projection to the source
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* projection) that takes a {@link ol.Coordinate} as argument and returns
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* the transformed {@link ol.Coordinate}.
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* @api
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*/
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ol.proj.addCoordinateTransforms =
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function(source, destination, forward, inverse) {
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var sourceProj = ol.proj.get(source);
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var destProj = ol.proj.get(destination);
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ol.proj.addTransform(sourceProj, destProj,
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ol.proj.createTransformFromCoordinateTransform(forward));
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ol.proj.addTransform(destProj, sourceProj,
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ol.proj.createTransformFromCoordinateTransform(inverse));
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};
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/**
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* Creates a {@link ol.TransformFunction} from a simple 2D coordinate transform
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* function.
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* @param {function(ol.Coordinate): ol.Coordinate} transform Coordinate
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* transform.
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* @return {ol.TransformFunction} Transform function.
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*/
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ol.proj.createTransformFromCoordinateTransform = function(transform) {
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return (
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/**
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* @param {Array.<number>} input Input.
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* @param {Array.<number>=} opt_output Output.
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* @param {number=} opt_dimension Dimension.
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* @return {Array.<number>} Output.
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*/
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function(input, opt_output, opt_dimension) {
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var length = input.length;
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var dimension = goog.isDef(opt_dimension) ? opt_dimension : 2;
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var output = goog.isDef(opt_output) ? opt_output : new Array(length);
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var point, i, j;
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for (i = 0; i < length; i += dimension) {
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point = transform([input[i], input[i + 1]]);
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output[i] = point[0];
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output[i + 1] = point[1];
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for (j = dimension - 1; j >= 2; --j) {
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output[i + j] = input[i + j];
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}
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}
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return output;
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});
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};
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/**
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* Unregisters the conversion function to convert coordinates from the source
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* projection to the destination projection. This method is used to clean up
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* cached transforms during testing.
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*
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* @param {ol.proj.Projection} source Source projection.
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* @param {ol.proj.Projection} destination Destination projection.
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* @return {ol.TransformFunction} transformFn The unregistered transform.
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*/
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ol.proj.removeTransform = function(source, destination) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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var transforms = ol.proj.transforms_;
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goog.asserts.assert(sourceCode in transforms);
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goog.asserts.assert(destinationCode in transforms[sourceCode]);
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var transform = transforms[sourceCode][destinationCode];
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delete transforms[sourceCode][destinationCode];
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var keys = goog.object.getKeys(transforms[sourceCode]);
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if (keys.length === 0) {
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delete transforms[sourceCode];
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}
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return transform;
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};
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/**
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* Fetches a Projection object for the code specified.
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*
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* @param {ol.proj.ProjectionLike} projectionLike Either a code string which is
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* a combination of authority and identifier such as "EPSG:4326", or an
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* existing projection object, or undefined.
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* @return {ol.proj.Projection} Projection object, or null if not in list.
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* @api
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*/
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ol.proj.get = function(projectionLike) {
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var projection;
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if (projectionLike instanceof ol.proj.Projection) {
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projection = projectionLike;
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} else if (goog.isString(projectionLike)) {
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var code = projectionLike;
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var projections = ol.proj.projections_;
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projection = projections[code];
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if (ol.ENABLE_PROJ4JS && !goog.isDef(projection) &&
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typeof proj4 == 'function') {
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var def = proj4.defs(code);
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if (goog.isDef(def)) {
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var units = def.units;
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if (!goog.isDef(units)) {
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if (goog.isDef(def.to_meter)) {
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units = def.to_meter.toString();
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ol.proj.METERS_PER_UNIT[units] = def.to_meter;
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}
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}
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projection = new ol.proj.Projection({
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code: code,
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units: units,
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axisOrientation: def.axis
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});
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ol.proj.addProjection(projection);
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var currentCode, currentDef, currentProj, proj4Transform;
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for (currentCode in projections) {
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currentDef = proj4.defs(currentCode);
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if (goog.isDef(currentDef)) {
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currentProj = ol.proj.get(currentCode);
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if (currentDef === def) {
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ol.proj.addEquivalentProjections([currentProj, projection]);
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} else {
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proj4Transform = proj4(currentCode, code);
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ol.proj.addCoordinateTransforms(currentProj, projection,
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proj4Transform.forward, proj4Transform.inverse);
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}
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}
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}
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} else {
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goog.asserts.assert(goog.isDef(projection));
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projection = null;
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}
|
|
}
|
|
} else {
|
|
projection = null;
|
|
}
|
|
return projection;
|
|
};
|
|
|
|
|
|
/**
|
|
* Checks if two projections are the same, that is every coordinate in one
|
|
* projection does represent the same geographic point as the same coordinate in
|
|
* the other projection.
|
|
*
|
|
* @param {ol.proj.Projection} projection1 Projection 1.
|
|
* @param {ol.proj.Projection} projection2 Projection 2.
|
|
* @return {boolean} Equivalent.
|
|
*/
|
|
ol.proj.equivalent = function(projection1, projection2) {
|
|
if (projection1 === projection2) {
|
|
return true;
|
|
} else if (projection1.getUnits() != projection2.getUnits()) {
|
|
return false;
|
|
} else {
|
|
var transformFn = ol.proj.getTransformFromProjections(
|
|
projection1, projection2);
|
|
return transformFn === ol.proj.cloneTransform;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Given the projection-like objects, searches for a transformation
|
|
* function to convert a coordinates array from the source projection to the
|
|
* destination projection.
|
|
*
|
|
* @param {ol.proj.ProjectionLike} source Source.
|
|
* @param {ol.proj.ProjectionLike} destination Destination.
|
|
* @return {ol.TransformFunction} Transform function.
|
|
* @api
|
|
*/
|
|
ol.proj.getTransform = function(source, destination) {
|
|
var sourceProjection = ol.proj.get(source);
|
|
var destinationProjection = ol.proj.get(destination);
|
|
return ol.proj.getTransformFromProjections(
|
|
sourceProjection, destinationProjection);
|
|
};
|
|
|
|
|
|
/**
|
|
* Searches in the list of transform functions for the function for converting
|
|
* coordinates from the source projection to the destination projection.
|
|
*
|
|
* @param {ol.proj.Projection} sourceProjection Source Projection object.
|
|
* @param {ol.proj.Projection} destinationProjection Destination Projection
|
|
* object.
|
|
* @return {ol.TransformFunction} Transform function.
|
|
*/
|
|
ol.proj.getTransformFromProjections =
|
|
function(sourceProjection, destinationProjection) {
|
|
var transforms = ol.proj.transforms_;
|
|
var sourceCode = sourceProjection.getCode();
|
|
var destinationCode = destinationProjection.getCode();
|
|
var transform;
|
|
if (goog.object.containsKey(transforms, sourceCode) &&
|
|
goog.object.containsKey(transforms[sourceCode], destinationCode)) {
|
|
transform = transforms[sourceCode][destinationCode];
|
|
}
|
|
if (!goog.isDef(transform)) {
|
|
goog.asserts.assert(goog.isDef(transform));
|
|
transform = ol.proj.identityTransform;
|
|
}
|
|
return transform;
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {Array.<number>} input Input coordinate array.
|
|
* @param {Array.<number>=} opt_output Output array of coordinate values.
|
|
* @param {number=} opt_dimension Dimension.
|
|
* @return {Array.<number>} Input coordinate array (same array as input).
|
|
*/
|
|
ol.proj.identityTransform = function(input, opt_output, opt_dimension) {
|
|
if (goog.isDef(opt_output) && input !== opt_output) {
|
|
// TODO: consider making this a warning instead
|
|
goog.asserts.fail('This should not be used internally.');
|
|
for (var i = 0, ii = input.length; i < ii; ++i) {
|
|
opt_output[i] = input[i];
|
|
}
|
|
input = opt_output;
|
|
}
|
|
return input;
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {Array.<number>} input Input coordinate array.
|
|
* @param {Array.<number>=} opt_output Output array of coordinate values.
|
|
* @param {number=} opt_dimension Dimension.
|
|
* @return {Array.<number>} Output coordinate array (new array, same coordinate
|
|
* values).
|
|
*/
|
|
ol.proj.cloneTransform = function(input, opt_output, opt_dimension) {
|
|
var output;
|
|
if (goog.isDef(opt_output)) {
|
|
for (var i = 0, ii = input.length; i < ii; ++i) {
|
|
opt_output[i] = input[i];
|
|
}
|
|
output = opt_output;
|
|
} else {
|
|
output = input.slice();
|
|
}
|
|
return output;
|
|
};
|
|
|
|
|
|
/**
|
|
* Transforms a coordinate from source projection to destination projection.
|
|
* This returns a new coordinate (and does not modify the original).
|
|
*
|
|
* See {@link ol.proj.transformExtent} for extent transformation.
|
|
* See the transform method of {@link ol.geom.Geometry} and its subclasses for
|
|
* geometry transforms.
|
|
*
|
|
* @param {ol.Coordinate} coordinate Coordinate.
|
|
* @param {ol.proj.ProjectionLike} source Source projection-like.
|
|
* @param {ol.proj.ProjectionLike} destination Destination projection-like.
|
|
* @return {ol.Coordinate} Coordinate.
|
|
* @api
|
|
*/
|
|
ol.proj.transform = function(coordinate, source, destination) {
|
|
var transformFn = ol.proj.getTransform(source, destination);
|
|
return transformFn(coordinate);
|
|
};
|
|
|
|
|
|
/**
|
|
* Transforms an extent from source projection to destination projection. This
|
|
* returns a new extent (and does not modify the original).
|
|
*
|
|
* @param {ol.Extent} extent The extent to transform.
|
|
* @param {ol.proj.ProjectionLike} source Source projection-like.
|
|
* @param {ol.proj.ProjectionLike} destination Destination projection-like.
|
|
* @return {ol.Extent} The transformed extent.
|
|
* @api
|
|
*/
|
|
ol.proj.transformExtent = function(extent, source, destination) {
|
|
var transformFn = ol.proj.getTransform(source, destination);
|
|
return ol.extent.applyTransform(extent, transformFn);
|
|
};
|
|
|
|
|
|
/**
|
|
* Transforms the given point to the destination projection.
|
|
*
|
|
* @param {ol.Coordinate} point Point.
|
|
* @param {ol.proj.Projection} sourceProjection Source projection.
|
|
* @param {ol.proj.Projection} destinationProjection Destination projection.
|
|
* @return {ol.Coordinate} Point.
|
|
*/
|
|
ol.proj.transformWithProjections =
|
|
function(point, sourceProjection, destinationProjection) {
|
|
var transformFn = ol.proj.getTransformFromProjections(
|
|
sourceProjection, destinationProjection);
|
|
return transformFn(point);
|
|
};
|