X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=js%2Fsrc%2Fgeo%2FOpenLayersMapPart.js;h=71b9a17b0574dd1539e1eb00c4cc5fa7823598c6;hb=b384a9cbe93b83b3aa94fe46cf2ff0a929f0332c;hp=a75956680ee1e165ebf0151015d973725df8ef62;hpb=3283994ed0bb41099776e8f6ec9b3fbcbc767a84;p=gpl%2Fargeo-suite.git

diff --git a/js/src/geo/OpenLayersMapPart.js b/js/src/geo/OpenLayersMapPart.js
index a759566..71b9a17 100644
--- a/js/src/geo/OpenLayersMapPart.js
+++ b/js/src/geo/OpenLayersMapPart.js
@@ -6,7 +6,7 @@ import Map from 'ol/Map.js';
 import View from 'ol/View.js';
 import OSM from 'ol/source/OSM.js';
 import TileLayer from 'ol/layer/Tile.js';
-import { fromLonLat, getPointResolution } from 'ol/proj.js';
+import { fromLonLat, getPointResolution, transformExtent } from 'ol/proj.js';
 import VectorSource from 'ol/source/Vector.js';
 import Feature from 'ol/Feature.js';
 import { Point } from 'ol/geom.js';
@@ -21,6 +21,8 @@ import * as SLDReader from '@nieuwlandgeo/sldreader';
 
 import MapPart from './MapPart.js';
 
+import { bbox } from 'ol/loadingstrategy';
+
 /** OpenLayers implementation of MapPart. */
 export default class OpenLayersMapPart extends MapPart {
 	/** The OpenLayers Map. */
@@ -46,12 +48,14 @@ export default class OpenLayersMapPart extends MapPart {
 				//									transition: 0,
 				//								}),
 			],
-			//			view: new View({
-			//				center: [0, 0],
-			//				zoom: 2,
-			//			}),
+			//						view: new View({
+			//							projection: 'EPSG:4326',
+			//							center: [0, 0],
+			//							zoom: 2,
+			//						}),
 			target: this.getMapName(),
 		});
+		//this.#map.getView().set('projection', 'EPSG:4326', true);
 	}
 
 	/* GEOGRAPHICAL METHODS */
@@ -282,4 +286,44 @@ export default class OpenLayersMapPart extends MapPart {
 		});
 		vectorLayer.setStyle(olStyleFunction);
 	}
-}
\ No newline at end of file
+
+	//
+	// BBOX
+	//
+	applyBboxStrategy(layerName) {
+		const layer = this.getLayerByName(layerName);
+		const vectorSource = layer.getSource();
+		const baseUrl = vectorSource.getUrl();
+		if (typeof baseUrl === 'function')
+			throw new Error('A strategy was already applied to layer ' + layerName);
+
+		const loadFunction = function(extent, resolution, projection, success, failure) {
+
+			const proj = projection.getCode();
+			var bbox = transformExtent(extent, proj, 'EPSG:4326');
+
+			const url = baseUrl + '&' +
+				'bbox=' + bbox.join(',') ;
+//				'bbox=' + extent.join(',') + ',' + proj;
+			const xhr = new XMLHttpRequest();
+			xhr.open('GET', url);
+			const onError = function() {
+				vectorSource.removeLoadedExtent(extent);
+				failure();
+			}
+			xhr.onerror = onError;
+			xhr.onload = function() {
+				if (xhr.status == 200) {
+					const features = vectorSource.getFormat().readFeatures(xhr.responseText);
+					vectorSource.addFeatures(features);
+					success(features);
+				} else {
+					onError();
+				}
+			}
+			xhr.send();
+		}
+
+		vectorSource.setLoader(loadFunction);
+	}
+}