diff --git a/examples/layer-clipping-vector.js b/examples/layer-clipping-vector.js index 46d922acbc..5568d0e411 100644 --- a/examples/layer-clipping-vector.js +++ b/examples/layer-clipping-vector.js @@ -1,13 +1,20 @@ import GeoJSON from '../src/ol/format/GeoJSON.js'; import Map from '../src/ol/Map.js'; -import OSM from '../src/ol/source/OSM.js'; -import VectorSource from '../src/ol/source/Vector.js'; import View from '../src/ol/View.js'; import {Fill, Style} from '../src/ol/style.js'; +import {OSM, Stamen, Vector as VectorSource} from '../src/ol/source.js'; import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js'; import {fromLonLat} from '../src/ol/proj.js'; import {getVectorContext} from '../src/ol/render.js'; +//A distinct className is required to use another canvas for the background +const background = new TileLayer({ + className: 'stamen', + source: new Stamen({ + layer: 'toner', + }), +}); + const base = new TileLayer({ source: new OSM(), }); @@ -20,6 +27,11 @@ const clipLayer = new VectorLayer({ }), }); +//Giving the clipped layer an extent is necessary to avoid rendering when the feature is outside the viewport +clipLayer.getSource().on('addfeature', function () { + base.setExtent(clipLayer.getSource().getExtent()); +}); + const style = new Style({ fill: new Fill({ color: 'black', @@ -27,8 +39,8 @@ const style = new Style({ }); base.on('postrender', function (e) { - e.context.globalCompositeOperation = 'destination-in'; const vectorContext = getVectorContext(e); + e.context.globalCompositeOperation = 'destination-in'; clipLayer.getSource().forEachFeature(function (feature) { vectorContext.drawFeature(feature, style); }); @@ -36,7 +48,7 @@ base.on('postrender', function (e) { }); const map = new Map({ - layers: [base, clipLayer], + layers: [background, base, clipLayer], target: 'map', view: new View({ center: fromLonLat([8.23, 46.86]),