77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
/* Copyright (c) 2019 Jean-Marc VIGLINO,
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released under the CeCILL-B license (French BSD license)
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(http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt).
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*/
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import ol_source_BinBase from './BinBase.js'
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import {transform as ol_proj_transform} from 'ol/proj.js'
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import ol_geom_Polygon from 'ol/geom/Polygon.js'
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import { fromCircle as ol_geom_Polygon_fromCircle } from 'ol/geom/Polygon.js'
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import ol_geom_Circle from 'ol/geom/Circle.js'
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/** A source for grid binning
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* @constructor
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* @extends {ol.source.Vector}
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* @param {Object} options ol_source_VectorOptions + grid option
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* @param {ol.source.Vector} options.source Source
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* @param {number} [options.size] size of the grid in meter, default 200m
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* @param {boolean} [options.circle=false] use a circle shape
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* @param {function} [options.geometryFunction] Function that takes an ol.Feature as argument and returns an ol.geom.Point as feature's center.
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* @param {function} [options.flatAttributes] Function takes a bin and the features it contains and aggragate the features in the bin attributes when saving
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*/
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var ol_source_GridBin = class olsourceGridBin extends ol_source_BinBase {
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constructor(options) {
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options = options || {};
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super(options);
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this.set('gridProjection', options.gridProjection || 'EPSG:4326');
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this.setSize(options.size || 1);
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this.setCircle(options.circle || false);
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this.reset();
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}
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/** Set grid projection
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* @param {ol.ProjectionLike} proj
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*/
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setGridProjection(proj) {
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this.set('gridProjection', proj);
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this.reset();
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}
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/** Set grid size
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* @param {number} size
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*/
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setSize(size) {
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this.set('size', size);
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this.reset();
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}
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/** Set geometry shape as circle
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* @param {boolean} b
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*/
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setCircle(b) {
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this.set('circle', b);
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this.reset();
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}
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/** Get the grid geometry at the coord
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* @param {ol.Coordinate} coord
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* @returns {ol.geom.Polygon}
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* @api
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*/
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getGridGeomAt(coord) {
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coord = ol_proj_transform(coord, this.getProjection() || 'EPSG:3857', this.get('gridProjection'));
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var size = this.get('size');
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var x = size * Math.floor(coord[0] / size);
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var y = size * Math.floor(coord[1] / size);
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var geom;
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if (this.get('circle')) {
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geom = new ol_geom_Circle([x+size/2, y+size/2], size/2)
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geom = ol_geom_Polygon_fromCircle(geom);
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} else {
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geom = new ol_geom_Polygon([[[x, y], [x + size, y], [x + size, y + size], [x, y + size], [x, y]]]);
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}
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return geom.transform(this.get('gridProjection'), this.getProjection() || 'EPSG:3857');
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}
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}
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export default ol_source_GridBin
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