Add Graticule component
This commit is contained in:
Éric Lemoine
committed by
Andreas Hocevar
Andreas Hocevar
parent
9c70a49fb0
commit
9bd1ab78fc
427
src/ol/graticule.js
Normal file
427
src/ol/graticule.js
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goog.provide('ol.Graticule');
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goog.require('goog.asserts');
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goog.require('goog.math');
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goog.require('ol.extent');
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goog.require('ol.geom.LineString');
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goog.require('ol.geom.flat.geodesic');
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goog.require('ol.proj');
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goog.require('ol.render.EventType');
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goog.require('ol.style.Stroke');
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/**
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* @constructor
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* @param {olx.GraticuleOptions=} opt_options Options.
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* @api
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*/
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ol.Graticule = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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/**
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* @type {ol.Map}
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* @private
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*/
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this.map_ = null;
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/**
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* @type {ol.proj.Projection}
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* @private
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*/
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this.projection_ = null;
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/**
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* @type {number}
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* @private
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*/
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this.maxLat_ = Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.maxLon_ = Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.minLat_ = -Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.minLon_ = -Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.targetSize_ = goog.isDef(options.targetSize) ?
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options.targetSize : 100;
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/**
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* @type {number}
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* @private
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*/
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this.maxLines_ = goog.isDef(options.maxLines) ? options.maxLines : 100;
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goog.asserts.assert(this.maxLines_ > 0);
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/**
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* @type {Array.<ol.geom.LineString>}
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* @private
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*/
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this.meridians_ = [];
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/**
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* @type {Array.<ol.geom.LineString>}
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* @private
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*/
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this.parallels_ = [];
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/**
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* TODO can be configurable
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* @type {ol.style.Stroke}
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* @private
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*/
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this.strokeStyle_ = new ol.style.Stroke({
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color: 'rgba(0,0,0,0.2)'
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});
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/**
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* @type {ol.TransformFunction|undefined}
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* @private
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*/
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this.fromLonLatTransform_ = undefined;
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/**
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* @type {ol.TransformFunction|undefined}
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* @private
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*/
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this.toLonLatTransform_ = undefined;
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/**
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* @type {ol.Coordinate}
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* @private
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*/
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this.projectionCenterLonLat_ = null;
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this.setMap(goog.isDef(options.map) ? options.map : null);
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};
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/**
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* TODO can be configurable
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* @type {Array.<number>}
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* @private
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*/
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ol.Graticule.intervals_ = [90, 45, 30, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05,
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0.01, 0.005, 0.002, 0.001];
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/**
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* @param {number} lon Longitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @param {ol.Extent} extent Extent.
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* @param {number} index Index.
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* @return {number} Index.
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* @private
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*/
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ol.Graticule.prototype.addMeridian_ =
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function(lon, squaredTolerance, extent, index) {
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var lineString = this.getMeridian_(lon, squaredTolerance, index);
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if (ol.extent.intersects(lineString.getExtent(), extent)) {
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this.meridians_[index++] = lineString;
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}
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return index;
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};
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/**
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* @param {number} lat Latitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @param {ol.Extent} extent Extent.
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* @param {number} index Index.
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* @return {number} Index.
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* @private
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*/
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ol.Graticule.prototype.addParallel_ =
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function(lat, squaredTolerance, extent, index) {
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var lineString = this.getParallel_(lat, squaredTolerance, index);
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if (ol.extent.intersects(lineString.getExtent(), extent)) {
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this.parallels_[index++] = lineString;
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}
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return index;
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};
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/**
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* @param {ol.Extent} extent Extent.
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* @param {ol.Coordinate} center Center.
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* @param {number} resolution Resolution.
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* @param {number} squaredTolerance Squared tolerance.
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* @private
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*/
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ol.Graticule.prototype.createGraticule_ =
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function(extent, center, resolution, squaredTolerance) {
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var interval = this.getInterval_(resolution);
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if (interval == -1) {
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this.meridians_.length = this.parallels_.length = 0;
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return;
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}
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var centerLonLat = this.toLonLatTransform_(center);
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var centerLon = centerLonLat[0];
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var centerLat = centerLonLat[1];
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var maxLines = this.maxLines_;
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var cnt, idx, lat, lon;
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// Create meridians
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centerLon = Math.floor(centerLon / interval) * interval;
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lon = goog.math.clamp(centerLon, this.minLon_, this.maxLon_);
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idx = this.addMeridian_(lon, squaredTolerance, extent, 0);
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cnt = 0;
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while (lon != this.minLon_ && cnt++ < maxLines) {
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lon = Math.max(lon - interval, this.minLon_);
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idx = this.addMeridian_(lon, squaredTolerance, extent, idx);
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}
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lon = goog.math.clamp(centerLon, this.minLon_, this.maxLon_);
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cnt = 0;
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while (lon != this.maxLon_ && cnt++ < maxLines) {
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lon = Math.min(lon + interval, this.maxLon_);
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idx = this.addMeridian_(lon, squaredTolerance, extent, idx);
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}
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this.meridians_.length = idx;
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// Create parallels
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centerLat = Math.floor(centerLat / interval) * interval;
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lat = goog.math.clamp(centerLat, this.minLat_, this.maxLat_);
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idx = this.addParallel_(lat, squaredTolerance, extent, 0);
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cnt = 0;
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while (lat != this.minLat_ && cnt++ < maxLines) {
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lat = Math.max(lat - interval, this.minLat_);
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idx = this.addParallel_(lat, squaredTolerance, extent, idx);
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}
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lat = goog.math.clamp(centerLat, this.minLat_, this.maxLat_);
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cnt = 0;
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while (lat != this.maxLat_ && cnt++ < maxLines) {
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lat = Math.min(lat + interval, this.maxLat_);
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idx = this.addParallel_(lat, squaredTolerance, extent, idx);
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}
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this.parallels_.length = idx;
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};
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/**
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* @param {number} resolution Resolution.
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* @return {number} The interval in degrees.
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* @private
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*/
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ol.Graticule.prototype.getInterval_ = function(resolution) {
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var centerLon = this.projectionCenterLonLat_[0];
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var centerLat = this.projectionCenterLonLat_[1];
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var interval = -1;
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var i, ii, delta, dist;
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var target = Math.pow(this.targetSize_ * resolution, 2);
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/** @type {Array.<number>} **/
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var p1 = [];
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/** @type {Array.<number>} **/
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var p2 = [];
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for (i = 0, ii = ol.Graticule.intervals_.length; i < ii; ++i) {
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delta = ol.Graticule.intervals_[i] / 2;
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p1[0] = centerLon - delta;
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p1[1] = centerLat - delta;
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p2[0] = centerLon + delta;
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p2[1] = centerLat + delta;
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this.fromLonLatTransform_(p1, p1);
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this.fromLonLatTransform_(p2, p2);
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dist = Math.pow(p2[0] - p1[0], 2) + Math.pow(p2[1] - p1[1], 2);
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if (dist <= target) {
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break;
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}
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interval = ol.Graticule.intervals_[i];
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}
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return interval;
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};
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/**
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* @return {ol.Map} The map.
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* @api
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*/
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ol.Graticule.prototype.getMap = function() {
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return this.map_;
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};
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/**
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* @param {number} lon Longitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @return {ol.geom.LineString} The meridian line string.
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* @param {number} index Index.
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* @private
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*/
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ol.Graticule.prototype.getMeridian_ = function(lon, squaredTolerance, index) {
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goog.asserts.assert(lon >= this.minLon_);
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goog.asserts.assert(lon <= this.maxLon_);
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var flatCoordinates = ol.geom.flat.geodesic.meridian(lon,
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this.minLat_, this.maxLat_, this.projection_, squaredTolerance);
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goog.asserts.assert(flatCoordinates.length > 0);
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var lineString = goog.isDef(this.meridians_[index]) ?
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this.meridians_[index] : new ol.geom.LineString(null);
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lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
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return lineString;
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};
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/**
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* @return {Array.<ol.geom.LineString>} The meridians.
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* @api
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*/
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ol.Graticule.prototype.getMeridians = function() {
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return this.meridians_;
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};
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/**
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* @param {number} lat Latitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @return {ol.geom.LineString} The parallel line string.
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* @param {number} index Index.
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* @private
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*/
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ol.Graticule.prototype.getParallel_ = function(lat, squaredTolerance, index) {
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goog.asserts.assert(lat >= this.minLat_);
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goog.asserts.assert(lat <= this.maxLat_);
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var flatCoordinates = ol.geom.flat.geodesic.parallel(lat,
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this.minLon_, this.maxLon_, this.projection_, squaredTolerance);
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goog.asserts.assert(flatCoordinates.length > 0);
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var lineString = goog.isDef(this.parallels_[index]) ?
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this.parallels_[index] : new ol.geom.LineString(null);
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lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
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return lineString;
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};
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/**
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* @return {Array.<ol.geom.LineString>} The parallels.
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* @api
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*/
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ol.Graticule.prototype.getParallels = function() {
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return this.parallels_;
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};
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/**
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* @param {ol.render.Event} e Event.
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* @private
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*/
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ol.Graticule.prototype.handlePostCompose_ = function(e) {
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var vectorContext = e.vectorContext;
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var frameState = e.frameState;
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var extent = frameState.extent;
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var viewState = frameState.viewState;
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var center = viewState.center;
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var projection = viewState.projection;
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var resolution = viewState.resolution;
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var pixelRatio = frameState.pixelRatio;
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var squaredTolerance =
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resolution * resolution / (4 * pixelRatio * pixelRatio);
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var updateProjectionInfo = goog.isNull(this.projection_) ||
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!ol.proj.equivalent(this.projection_, projection);
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if (updateProjectionInfo) {
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this.updateProjectionInfo_(projection);
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}
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this.createGraticule_(extent, center, resolution, squaredTolerance);
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// Draw the lines
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vectorContext.setFillStrokeStyle(null, this.strokeStyle_);
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var i, l, line;
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for (i = 0, l = this.meridians_.length; i < l; ++i) {
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line = this.meridians_[i];
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vectorContext.drawLineStringGeometry(line, null);
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}
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for (i = 0, l = this.parallels_.length; i < l; ++i) {
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line = this.parallels_[i];
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vectorContext.drawLineStringGeometry(line, null);
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}
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};
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/**
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* @param {ol.proj.Projection} projection Projection.
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* @private
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*/
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ol.Graticule.prototype.updateProjectionInfo_ = function(projection) {
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goog.asserts.assert(!goog.isNull(projection));
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var extent = projection.getExtent();
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var worldExtent = projection.getWorldExtent();
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var maxLat = worldExtent[3];
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var maxLon = worldExtent[2];
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var minLat = worldExtent[1];
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var minLon = worldExtent[0];
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goog.asserts.assert(!goog.isNull(extent));
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goog.asserts.assert(goog.isDef(maxLat));
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goog.asserts.assert(goog.isDef(maxLon));
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goog.asserts.assert(goog.isDef(minLat));
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goog.asserts.assert(goog.isDef(minLon));
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this.maxLat_ = maxLat;
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this.maxLon_ = maxLon;
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this.minLat_ = minLat;
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this.minLon_ = minLon;
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var epsg4326Projection = ol.proj.get('EPSG:4326');
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this.fromLonLatTransform_ = ol.proj.getTransform(
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epsg4326Projection, projection);
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this.toLonLatTransform_ = ol.proj.getTransform(
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projection, epsg4326Projection);
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this.projectionCenterLonLat_ = this.toLonLatTransform_(
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ol.extent.getCenter(extent));
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this.projection_ = projection;
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};
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/**
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* @param {ol.Map} map Map.
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* @api
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*/
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ol.Graticule.prototype.setMap = function(map) {
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if (!goog.isNull(this.map_)) {
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this.map_.un(ol.render.EventType.POSTCOMPOSE,
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this.handlePostCompose_, this);
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this.map_.render();
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}
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if (!goog.isNull(map)) {
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map.on(ol.render.EventType.POSTCOMPOSE,
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this.handlePostCompose_, this);
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map.render();
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}
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this.map_ = map;
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};
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