724 lines
21 KiB
JavaScript
724 lines
21 KiB
JavaScript
/**
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* @module ol/Graticule
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*/
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import {degreesToStringHDMS} from './coordinate.js';
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import {listen, unlistenByKey} from './events.js';
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import {intersects, getCenter} from './extent.js';
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import GeometryLayout from './geom/GeometryLayout.js';
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import LineString from './geom/LineString.js';
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import Point from './geom/Point.js';
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import {meridian, parallel} from './geom/flat/geodesic.js';
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import {clamp} from './math.js';
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import {get as getProjection, equivalent as equivalentProjection, getTransform, transformExtent} from './proj.js';
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import RenderEventType from './render/EventType.js';
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import Fill from './style/Fill.js';
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import Stroke from './style/Stroke.js';
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import Text from './style/Text.js';
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/**
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* @type {module:ol/style/Stroke}
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* @private
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* @const
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*/
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const DEFAULT_STROKE_STYLE = new Stroke({
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color: 'rgba(0,0,0,0.2)'
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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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const INTERVALS = [
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90, 45, 30, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05, 0.01, 0.005, 0.002, 0.001
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];
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/**
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* @typedef {Object} GraticuleLabelDataType
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* @property {module:ol/geom/Point} geom
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* @property {string} text
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*/
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/**
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* @typedef {Object} Options
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* @property {module:ol/PluggableMap} [map] Reference to an
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* {@link module:ol/Map~Map} object.
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* @property {number} [maxLines=100] The maximum number of meridians and
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* parallels from the center of the map. The default value of 100 means that at
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* most 200 meridians and 200 parallels will be displayed. The default value is
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* appropriate for conformal projections like Spherical Mercator. If you
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* increase the value, more lines will be drawn and the drawing performance will
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* decrease.
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* @property {module:ol/style/Stroke} [strokeStyle='rgba(0,0,0,0.2)'] The
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* stroke style to use for drawing the graticule. If not provided, a not fully
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* opaque black will be used.
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* @property {number} [targetSize=100] The target size of the graticule cells,
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* in pixels.
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* @property {boolean} [showLabels=false] Render a label with the respective
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* latitude/longitude for each graticule line.
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* @property {function(number):string} [lonLabelFormatter] Label formatter for
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* longitudes. This function is called with the longitude as argument, and
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* should return a formatted string representing the longitude. By default,
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* labels are formatted as degrees, minutes, seconds and hemisphere.
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* @property {function(number):string} [latLabelFormatter] Label formatter for
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* latitudes. This function is called with the latitude as argument, and
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* should return a formatted string representing the latitude. By default,
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* labels are formatted as degrees, minutes, seconds and hemisphere.
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* @property {number} [lonLabelPosition=0] Longitude label position in fractions
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* (0..1) of view extent. 0 means at the bottom of the viewport, 1 means at the
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* top.
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* @property {number} [latLabelPosition=1] Latitude label position in fractions
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* (0..1) of view extent. 0 means at the left of the viewport, 1 means at the
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* right.
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* @property {module:ol/style/Text} [lonLabelStyle] Longitude label text
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* style. If not provided, the following style will be used:
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* ```js
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* new Text({
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* font: '12px Calibri,sans-serif',
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* textBaseline: 'bottom',
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* fill: new Fill({
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* color: 'rgba(0,0,0,1)'
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* }),
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* stroke: new Stroke({
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* color: 'rgba(255,255,255,1)',
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* width: 3
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* })
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* });
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* ```
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* Note that the default's `textBaseline` configuration will not work well for
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* `lonLabelPosition` configurations that position labels close to the top of
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* the viewport.
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* @property {module:ol/style/Text} [latLabelStyle] Latitude label text style.
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* If not provided, the following style will be used:
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* ```js
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* new Text({
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* font: '12px Calibri,sans-serif',
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* textAlign: 'end',
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* fill: new Fill({
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* color: 'rgba(0,0,0,1)'
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* }),
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* stroke: Stroke({
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* color: 'rgba(255,255,255,1)',
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* width: 3
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* })
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* });
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* ```
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* Note that the default's `textAlign` configuration will not work well for
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* `latLabelPosition` configurations that position labels close to the left of
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* the viewport.
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*/
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/**
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* Render a grid for a coordinate system on a map.
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* @api
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*/
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class Graticule {
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/**
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* @param {module:ol/Graticule~Options=} opt_options Options.
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*/
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constructor(opt_options) {
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const options = opt_options || {};
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/**
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* @type {module:ol/PluggableMap}
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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 {?module:ol/events~EventsKey}
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* @private
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*/
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this.postcomposeListenerKey_ = null;
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/**
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* @type {module:ol/proj/Projection}
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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.maxLatP_ = 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.maxLonP_ = 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.minLatP_ = -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.minLonP_ = -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_ = options.targetSize !== undefined ? 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_ = options.maxLines !== undefined ? options.maxLines : 100;
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/**
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* @type {Array.<module: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.<module: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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* @type {module:ol/style/Stroke}
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* @private
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*/
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this.strokeStyle_ = options.strokeStyle !== undefined ? options.strokeStyle : DEFAULT_STROKE_STYLE;
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/**
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* @type {module:ol/proj~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 {module:ol/proj~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 {module:ol/coordinate~Coordinate}
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* @private
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*/
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this.projectionCenterLonLat_ = null;
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/**
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* @type {Array.<module:ol/Graticule~GraticuleLabelDataType>}
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* @private
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*/
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this.meridiansLabels_ = null;
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/**
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* @type {Array.<module:ol/Graticule~GraticuleLabelDataType>}
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* @private
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*/
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this.parallelsLabels_ = null;
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if (options.showLabels == true) {
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/**
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* @type {null|function(number):string}
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* @private
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*/
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this.lonLabelFormatter_ = options.lonLabelFormatter == undefined ?
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degreesToStringHDMS.bind(this, 'EW') : options.lonLabelFormatter;
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/**
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* @type {function(number):string}
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* @private
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*/
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this.latLabelFormatter_ = options.latLabelFormatter == undefined ?
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degreesToStringHDMS.bind(this, 'NS') : options.latLabelFormatter;
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/**
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* Longitude label position in fractions (0..1) of view extent. 0 means
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* bottom, 1 means top.
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* @type {number}
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* @private
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*/
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this.lonLabelPosition_ = options.lonLabelPosition == undefined ? 0 :
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options.lonLabelPosition;
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/**
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* Latitude Label position in fractions (0..1) of view extent. 0 means left, 1
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* means right.
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* @type {number}
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* @private
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*/
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this.latLabelPosition_ = options.latLabelPosition == undefined ? 1 :
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options.latLabelPosition;
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/**
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* @type {module:ol/style/Text}
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* @private
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*/
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this.lonLabelStyle_ = options.lonLabelStyle !== undefined ? options.lonLabelStyle :
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new Text({
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font: '12px Calibri,sans-serif',
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textBaseline: 'bottom',
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fill: new Fill({
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color: 'rgba(0,0,0,1)'
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}),
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stroke: new Stroke({
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color: 'rgba(255,255,255,1)',
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width: 3
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})
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});
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/**
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* @type {module:ol/style/Text}
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* @private
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*/
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this.latLabelStyle_ = options.latLabelStyle !== undefined ? options.latLabelStyle :
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new Text({
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font: '12px Calibri,sans-serif',
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textAlign: 'end',
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fill: new Fill({
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color: 'rgba(0,0,0,1)'
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}),
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stroke: new Stroke({
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color: 'rgba(255,255,255,1)',
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width: 3
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})
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});
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this.meridiansLabels_ = [];
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this.parallelsLabels_ = [];
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}
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this.setMap(options.map !== undefined ? options.map : null);
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}
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/**
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* @param {number} lon Longitude.
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* @param {number} minLat Minimal latitude.
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* @param {number} maxLat Maximal latitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @param {module:ol/extent~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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addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, index) {
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const lineString = this.getMeridian_(lon, minLat, maxLat, squaredTolerance, index);
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if (intersects(lineString.getExtent(), extent)) {
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if (this.meridiansLabels_) {
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const textPoint = this.getMeridianPoint_(lineString, extent, index);
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this.meridiansLabels_[index] = {
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geom: textPoint,
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text: this.lonLabelFormatter_(lon)
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};
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}
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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 {module:ol/geom/LineString} lineString Meridian
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* @param {module:ol/extent~Extent} extent Extent.
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* @param {number} index Index.
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* @return {module:ol/geom/Point} Meridian point.
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* @private
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*/
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getMeridianPoint_(lineString, extent, index) {
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const flatCoordinates = lineString.getFlatCoordinates();
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const clampedBottom = Math.max(extent[1], flatCoordinates[1]);
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const clampedTop = Math.min(extent[3], flatCoordinates[flatCoordinates.length - 1]);
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const lat = clamp(
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extent[1] + Math.abs(extent[1] - extent[3]) * this.lonLabelPosition_,
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clampedBottom, clampedTop);
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const coordinate = [flatCoordinates[0], lat];
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let point;
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if (index in this.meridiansLabels_) {
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point = this.meridiansLabels_[index];
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point.setCoordinates(coordinate);
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} else {
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point = new Point(coordinate);
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}
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return point;
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}
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/**
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* @param {number} lat Latitude.
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* @param {number} minLon Minimal longitude.
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* @param {number} maxLon Maximal longitude.
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* @param {number} squaredTolerance Squared tolerance.
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* @param {module:ol/extent~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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addParallel_(lat, minLon, maxLon, squaredTolerance, extent, index) {
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const lineString = this.getParallel_(lat, minLon, maxLon, squaredTolerance, index);
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if (intersects(lineString.getExtent(), extent)) {
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if (this.parallelsLabels_) {
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const textPoint = this.getParallelPoint_(lineString, extent, index);
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this.parallelsLabels_[index] = {
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geom: textPoint,
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text: this.latLabelFormatter_(lat)
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};
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}
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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 {module:ol/geom/LineString} lineString Parallels.
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* @param {module:ol/extent~Extent} extent Extent.
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* @param {number} index Index.
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* @return {module:ol/geom/Point} Parallel point.
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* @private
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*/
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getParallelPoint_(lineString, extent, index) {
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const flatCoordinates = lineString.getFlatCoordinates();
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const clampedLeft = Math.max(extent[0], flatCoordinates[0]);
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const clampedRight = Math.min(extent[2], flatCoordinates[flatCoordinates.length - 2]);
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const lon = clamp(
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extent[0] + Math.abs(extent[0] - extent[2]) * this.latLabelPosition_,
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clampedLeft, clampedRight);
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const coordinate = [lon, flatCoordinates[1]];
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let point;
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if (index in this.parallelsLabels_) {
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point = this.parallelsLabels_[index];
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point.setCoordinates(coordinate);
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} else {
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point = new Point(coordinate);
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}
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return point;
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}
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/**
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* @param {module:ol/extent~Extent} extent Extent.
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* @param {module:ol/coordinate~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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createGraticule_(extent, center, resolution, squaredTolerance) {
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const 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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if (this.meridiansLabels_) {
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this.meridiansLabels_.length = 0;
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}
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if (this.parallelsLabels_) {
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this.parallelsLabels_.length = 0;
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}
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return;
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}
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const centerLonLat = this.toLonLatTransform_(center);
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let centerLon = centerLonLat[0];
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let centerLat = centerLonLat[1];
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const maxLines = this.maxLines_;
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let cnt, idx, lat, lon;
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let validExtent = [
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Math.max(extent[0], this.minLonP_),
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Math.max(extent[1], this.minLatP_),
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Math.min(extent[2], this.maxLonP_),
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Math.min(extent[3], this.maxLatP_)
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];
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validExtent = transformExtent(validExtent, this.projection_, 'EPSG:4326');
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const maxLat = validExtent[3];
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const maxLon = validExtent[2];
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const minLat = validExtent[1];
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const minLon = validExtent[0];
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// Create meridians
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centerLon = Math.floor(centerLon / interval) * interval;
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lon = clamp(centerLon, this.minLon_, this.maxLon_);
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idx = this.addMeridian_(lon, minLat, maxLat, 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, minLat, maxLat, squaredTolerance, extent, idx);
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}
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lon = 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, minLat, maxLat, squaredTolerance, extent, idx);
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}
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this.meridians_.length = idx;
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if (this.meridiansLabels_) {
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this.meridiansLabels_.length = idx;
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}
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// Create parallels
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centerLat = Math.floor(centerLat / interval) * interval;
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lat = clamp(centerLat, this.minLat_, this.maxLat_);
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idx = this.addParallel_(lat, minLon, maxLon, 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, minLon, maxLon, squaredTolerance, extent, idx);
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}
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lat = 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, minLon, maxLon, squaredTolerance, extent, idx);
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}
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this.parallels_.length = idx;
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if (this.parallelsLabels_) {
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this.parallelsLabels_.length = idx;
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}
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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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getInterval_(resolution) {
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const centerLon = this.projectionCenterLonLat_[0];
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const centerLat = this.projectionCenterLonLat_[1];
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|
let interval = -1;
|
|
const target = Math.pow(this.targetSize_ * resolution, 2);
|
|
/** @type {Array.<number>} **/
|
|
const p1 = [];
|
|
/** @type {Array.<number>} **/
|
|
const p2 = [];
|
|
for (let i = 0, ii = INTERVALS.length; i < ii; ++i) {
|
|
const delta = INTERVALS[i] / 2;
|
|
p1[0] = centerLon - delta;
|
|
p1[1] = centerLat - delta;
|
|
p2[0] = centerLon + delta;
|
|
p2[1] = centerLat + delta;
|
|
this.fromLonLatTransform_(p1, p1);
|
|
this.fromLonLatTransform_(p2, p2);
|
|
const dist = Math.pow(p2[0] - p1[0], 2) + Math.pow(p2[1] - p1[1], 2);
|
|
if (dist <= target) {
|
|
break;
|
|
}
|
|
interval = INTERVALS[i];
|
|
}
|
|
return interval;
|
|
}
|
|
|
|
/**
|
|
* Get the map associated with this graticule.
|
|
* @return {module:ol/PluggableMap} The map.
|
|
* @api
|
|
*/
|
|
getMap() {
|
|
return this.map_;
|
|
}
|
|
|
|
/**
|
|
* @param {number} lon Longitude.
|
|
* @param {number} minLat Minimal latitude.
|
|
* @param {number} maxLat Maximal latitude.
|
|
* @param {number} squaredTolerance Squared tolerance.
|
|
* @return {module:ol/geom/LineString} The meridian line string.
|
|
* @param {number} index Index.
|
|
* @private
|
|
*/
|
|
getMeridian_(lon, minLat, maxLat, squaredTolerance, index) {
|
|
const flatCoordinates = meridian(lon, minLat, maxLat, this.projection_, squaredTolerance);
|
|
let lineString = this.meridians_[index];
|
|
if (!lineString) {
|
|
lineString = this.meridians_[index] = new LineString(flatCoordinates, GeometryLayout.XY);
|
|
} else {
|
|
lineString.setFlatCoordinates(GeometryLayout.XY, flatCoordinates);
|
|
lineString.changed();
|
|
}
|
|
return lineString;
|
|
}
|
|
|
|
/**
|
|
* Get the list of meridians. Meridians are lines of equal longitude.
|
|
* @return {Array.<module:ol/geom/LineString>} The meridians.
|
|
* @api
|
|
*/
|
|
getMeridians() {
|
|
return this.meridians_;
|
|
}
|
|
|
|
/**
|
|
* @param {number} lat Latitude.
|
|
* @param {number} minLon Minimal longitude.
|
|
* @param {number} maxLon Maximal longitude.
|
|
* @param {number} squaredTolerance Squared tolerance.
|
|
* @return {module:ol/geom/LineString} The parallel line string.
|
|
* @param {number} index Index.
|
|
* @private
|
|
*/
|
|
getParallel_(lat, minLon, maxLon, squaredTolerance, index) {
|
|
const flatCoordinates = parallel(lat, minLon, maxLon, this.projection_, squaredTolerance);
|
|
let lineString = this.parallels_[index];
|
|
if (!lineString) {
|
|
lineString = new LineString(flatCoordinates, GeometryLayout.XY);
|
|
} else {
|
|
lineString.setFlatCoordinates(GeometryLayout.XY, flatCoordinates);
|
|
lineString.changed();
|
|
}
|
|
return lineString;
|
|
}
|
|
|
|
/**
|
|
* Get the list of parallels. Parallels are lines of equal latitude.
|
|
* @return {Array.<module:ol/geom/LineString>} The parallels.
|
|
* @api
|
|
*/
|
|
getParallels() {
|
|
return this.parallels_;
|
|
}
|
|
|
|
/**
|
|
* @param {module:ol/render/Event} e Event.
|
|
* @private
|
|
*/
|
|
handlePostCompose_(e) {
|
|
const vectorContext = e.vectorContext;
|
|
const frameState = e.frameState;
|
|
const extent = frameState.extent;
|
|
const viewState = frameState.viewState;
|
|
const center = viewState.center;
|
|
const projection = viewState.projection;
|
|
const resolution = viewState.resolution;
|
|
const pixelRatio = frameState.pixelRatio;
|
|
const squaredTolerance =
|
|
resolution * resolution / (4 * pixelRatio * pixelRatio);
|
|
|
|
const updateProjectionInfo = !this.projection_ ||
|
|
!equivalentProjection(this.projection_, projection);
|
|
|
|
if (updateProjectionInfo) {
|
|
this.updateProjectionInfo_(projection);
|
|
}
|
|
|
|
this.createGraticule_(extent, center, resolution, squaredTolerance);
|
|
|
|
// Draw the lines
|
|
vectorContext.setFillStrokeStyle(null, this.strokeStyle_);
|
|
let i, l, line;
|
|
for (i = 0, l = this.meridians_.length; i < l; ++i) {
|
|
line = this.meridians_[i];
|
|
vectorContext.drawGeometry(line);
|
|
}
|
|
for (i = 0, l = this.parallels_.length; i < l; ++i) {
|
|
line = this.parallels_[i];
|
|
vectorContext.drawGeometry(line);
|
|
}
|
|
let labelData;
|
|
if (this.meridiansLabels_) {
|
|
for (i = 0, l = this.meridiansLabels_.length; i < l; ++i) {
|
|
labelData = this.meridiansLabels_[i];
|
|
this.lonLabelStyle_.setText(labelData.text);
|
|
vectorContext.setTextStyle(this.lonLabelStyle_);
|
|
vectorContext.drawGeometry(labelData.geom);
|
|
}
|
|
}
|
|
if (this.parallelsLabels_) {
|
|
for (i = 0, l = this.parallelsLabels_.length; i < l; ++i) {
|
|
labelData = this.parallelsLabels_[i];
|
|
this.latLabelStyle_.setText(labelData.text);
|
|
vectorContext.setTextStyle(this.latLabelStyle_);
|
|
vectorContext.drawGeometry(labelData.geom);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {module:ol/proj/Projection} projection Projection.
|
|
* @private
|
|
*/
|
|
updateProjectionInfo_(projection) {
|
|
const epsg4326Projection = getProjection('EPSG:4326');
|
|
|
|
const worldExtent = projection.getWorldExtent();
|
|
const worldExtentP = transformExtent(worldExtent, epsg4326Projection, projection);
|
|
|
|
this.maxLat_ = worldExtent[3];
|
|
this.maxLon_ = worldExtent[2];
|
|
this.minLat_ = worldExtent[1];
|
|
this.minLon_ = worldExtent[0];
|
|
|
|
this.maxLatP_ = worldExtentP[3];
|
|
this.maxLonP_ = worldExtentP[2];
|
|
this.minLatP_ = worldExtentP[1];
|
|
this.minLonP_ = worldExtentP[0];
|
|
|
|
this.fromLonLatTransform_ = getTransform(epsg4326Projection, projection);
|
|
|
|
this.toLonLatTransform_ = getTransform(projection, epsg4326Projection);
|
|
|
|
this.projectionCenterLonLat_ = this.toLonLatTransform_(getCenter(projection.getExtent()));
|
|
|
|
this.projection_ = projection;
|
|
}
|
|
|
|
/**
|
|
* Set the map for this graticule. The graticule will be rendered on the
|
|
* provided map.
|
|
* @param {module:ol/PluggableMap} map Map.
|
|
* @api
|
|
*/
|
|
setMap(map) {
|
|
if (this.map_) {
|
|
unlistenByKey(this.postcomposeListenerKey_);
|
|
this.postcomposeListenerKey_ = null;
|
|
this.map_.render();
|
|
}
|
|
if (map) {
|
|
this.postcomposeListenerKey_ = listen(map, RenderEventType.POSTCOMPOSE, this.handlePostCompose_, this);
|
|
map.render();
|
|
}
|
|
this.map_ = map;
|
|
}
|
|
}
|
|
|
|
export default Graticule;
|