diff --git a/examples/reprojection-by-code.html b/examples/reprojection-by-code.html index 319309832a..df386d4864 100644 --- a/examples/reprojection-by-code.html +++ b/examples/reprojection-by-code.html @@ -6,12 +6,12 @@ docs: > This example shows client-side raster reprojection capabilities from OSM (EPSG:3857) to arbitrary projection by searching in EPSG.io database. -tags: "reprojection, projection, proj4js, epsg.io" +tags: "reprojection, projection, proj4js, epsg.io, graticule" ---
- +
@@ -19,5 +19,9 @@ tags: "reprojection, projection, proj4js, epsg.io" Render reprojection edges +
diff --git a/examples/reprojection-by-code.js b/examples/reprojection-by-code.js index 346cb3067a..0f72fa3a48 100644 --- a/examples/reprojection-by-code.js +++ b/examples/reprojection-by-code.js @@ -1,19 +1,34 @@ import Map from '../src/ol/Map.js'; import View from '../src/ol/View.js'; import {applyTransform} from '../src/ol/extent.js'; +import Graticule from '../src/ol/layer/Graticule.js'; import TileLayer from '../src/ol/layer/Tile.js'; import {get as getProjection, getTransform} from '../src/ol/proj.js'; import {register} from '../src/ol/proj/proj4.js'; import OSM from '../src/ol/source/OSM.js'; import TileImage from '../src/ol/source/TileImage.js'; +import Stroke from '../src/ol/style/Stroke.js'; import proj4 from 'proj4'; +const graticule = new Graticule({ + // the style to use for the lines, optional. + strokeStyle: new Stroke({ + color: 'rgba(255,120,0,0.9)', + width: 2, + lineDash: [0.5, 4] + }), + showLabels: true, + visible: false, + wrapX: false +}); + const map = new Map({ layers: [ new TileLayer({ source: new OSM() - }) + }), + graticule ], target: 'map', view: new View({ @@ -28,6 +43,7 @@ const queryInput = document.getElementById('epsg-query'); const searchButton = document.getElementById('epsg-search'); const resultSpan = document.getElementById('epsg-result'); const renderEdgesCheckbox = document.getElementById('render-edges'); +const showGraticuleCheckbox = document.getElementById('show-graticule'); function setProjection(code, name, proj4def, bbox) { if (code === null || name === null || proj4def === null || bbox === null) { @@ -48,9 +64,15 @@ function setProjection(code, name, proj4def, bbox) { const newProj = getProjection(newProjCode); const fromLonLat = getTransform('EPSG:4326', newProj); - // very approximate calculation of projection extent - const extent = applyTransform( - [bbox[1], bbox[2], bbox[3], bbox[0]], fromLonLat); + let worldExtent = [bbox[1], bbox[2], bbox[3], bbox[0]]; + newProj.setWorldExtent(worldExtent); + + // approximate calculation of projection extent, + // checking if the world extent crosses the dateline + if (bbox[1] > bbox[3]) { + worldExtent = [bbox[1], bbox[2], bbox[3] + 360, bbox[0]]; + } + const extent = applyTransform(worldExtent, fromLonLat, undefined, 8); newProj.setExtent(extent); const newView = new View({ projection: newProj @@ -98,7 +120,7 @@ searchButton.onclick = function(event) { /** - * Handle change event. + * Handle checkbox change event. */ renderEdgesCheckbox.onchange = function() { map.getLayers().forEach(function(layer) { @@ -110,3 +132,10 @@ renderEdgesCheckbox.onchange = function() { } }); }; + +/** + * Handle checkbox change event. + */ +showGraticuleCheckbox.onchange = function() { + graticule.setVisible(showGraticuleCheckbox.checked); +};