X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=js%2Fsrc%2Fgeo%2FOpenLayersMapPart.js;h=71b9a17b0574dd1539e1eb00c4cc5fa7823598c6;hb=b384a9cbe93b83b3aa94fe46cf2ff0a929f0332c;hp=177ce33862919d750769ae9029e187d1467df6db;hpb=59da7271e876ca8a429beb86b67e7350eef1e1ca;p=gpl%2Fargeo-suite.git

diff --git a/js/src/geo/OpenLayersMapPart.js b/js/src/geo/OpenLayersMapPart.js
index 177ce33..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';
@@ -21,11 +21,16 @@ 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. */
 	#map;
 
+	/** Styled layer descriptor */
+	#sld;
+
 	/** Externally added callback functions. */
 	callbacks = {};
 
@@ -37,18 +42,20 @@ export default class OpenLayersMapPart extends MapPart {
 				//				new TileLayer({
 				//					source: new SentinelCloudless(),
 				//				}),
-//								new TileLayer({
-//									source: new OSM(),
-//									opacity: 0.4,
-//									transition: 0,
-//								}),
+				//								new TileLayer({
+				//									source: new OSM(),
+				//									opacity: 0.4,
+				//									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 */
@@ -108,6 +115,19 @@ export default class OpenLayersMapPart extends MapPart {
 		return this.#map;
 	}
 
+	getLayerByName(name) {
+		let layers = this.#map.getLayers();
+		for (let i = 0; i < layers.getLength(); i++) {
+			let layer = layers.item(i);
+			let n = layer.get('name');
+			if (n !== undefined) {
+				if (name === n)
+					return layer;
+			}
+		}
+		return undefined;
+	}
+
 	/* CALLBACKS */
 	enableFeatureSingleClick() {
 		// we cannot use 'this' in the function provided to OpenLayers
@@ -210,6 +230,40 @@ export default class OpenLayersMapPart extends MapPart {
 	//
 	// SLD STYLING
 	//
+
+	setSld(xml) {
+		this.#sld = SLDReader.Reader(xml);
+	}
+
+	/** Get a FeatureTypeStyle (https://nieuwlandgeo.github.io/SLDReader/api.html#FeatureTypeStyle).  */
+	getFeatureTypeStyle(styledLayerName, styleName) {
+		const sldLayer = SLDReader.getLayer(this.#sld, styledLayerName);
+		const style = styleName === undefined ? SLDReader.getStyle(sldLayer) : SLDReader.getStyle(sldLayer, styleName);
+		// OpenLayers can only use one definition
+		const featureTypeStyle = style.featuretypestyles[0];
+		return featureTypeStyle;
+	}
+
+	applyStyle(layerName, styledLayerName, styleName) {
+		const layer = this.getLayerByName(layerName);
+		const featureTypeStyle = this.getFeatureTypeStyle(styledLayerName, styleName);
+		const viewProjection = this.#map.getView().getProjection();
+		const olStyleFunction = SLDReader.createOlStyleFunction(featureTypeStyle, {
+			// Use the convertResolution option to calculate a more accurate resolution.
+			convertResolution: viewResolution => {
+				const viewCenter = this.#map.getView().getCenter();
+				return getPointResolution(viewProjection, viewResolution, viewCenter);
+			},
+			// If you use point icons with an ExternalGraphic, you have to use imageLoadCallback
+			// to update the vector layer when an image finishes loading.
+			// If you do not do this, the image will only be visible after next layer pan/zoom.
+			imageLoadedCallback: () => {
+				layer.changed();
+			},
+		});
+		layer.setStyle(olStyleFunction);
+	}
+
 	#applySLD(vectorLayer, text) {
 		const sldObject = SLDReader.Reader(text);
 		const sldLayer = SLDReader.getLayer(sldObject);
@@ -232,4 +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);
+	}
+}