Add Show tile coordinates option

examples/reprojection-by-code.html

@@ -10,18 +10,24 @@ tags: "reprojection, projection, proj4js, epsg.io, graticule"
 ---
 <div id="map" class="map"></div>
 <form class="form-inline">
-  <label for="epsg-query">Search projection:</label>
+  <label for="epsg-query">Search projection:&nbsp</label>
   <input type="text" id="epsg-query" placeholder="4326, 27700, 3031, US National Atlas, Swiss, France, ..." class="form-control" size="50" />
   <button id="epsg-search" class="btn">Search</button>
   <span id="epsg-result"></span>
-  <div>
+</form>
+<form class="form-inline">
   <label for="render-edges">
-      Render reprojection edges
-      <input type="checkbox" id="render-edges">
+    Render reprojection edges:&nbsp;
+    <input type="checkbox" id="render-edges" />
   </label>
+  &nbsp;&nbsp;&nbsp;&nbsp;
+  <label for="show-tiles">
+    Show tile coordinates:&nbsp;
+    <input type="checkbox" id="show-tiles" />
+  </label>
+  &nbsp;&nbsp;&nbsp;&nbsp;
   <label for="show-graticule">
-      &nbsp;&nbsp;&nbsp;Show graticule
+    Show graticule:&nbsp;
     <input type="checkbox" id="show-graticule" />
   </label>
-  </div>
 </form>

examples/reprojection-by-code.js

@@ -2,7 +2,7 @@ import Graticule from '../src/ol/layer/Graticule.js';
 import Map from '../src/ol/Map.js';
 import OSM from '../src/ol/source/OSM.js';
 import Stroke from '../src/ol/style/Stroke.js';
-import TileImage from '../src/ol/source/TileImage.js';
+import TileDebug from '../src/ol/source/TileDebug.js';
 import TileLayer from '../src/ol/layer/Tile.js';
 import View from '../src/ol/View.js';
 import proj4 from 'proj4';
@@ -10,6 +10,16 @@ import {applyTransform} from '../src/ol/extent.js';
 import {get as getProjection, getTransform} from '../src/ol/proj.js';
 import {register} from '../src/ol/proj/proj4.js';
 
+const osmSource = new OSM();
+
+const debugLayer = new TileLayer({
+  source: new TileDebug({
+    tileGrid: osmSource.getTileGrid(),
+    projection: osmSource.getProjection(),
+  }),
+  visible: false,
+});
+
 const graticule = new Graticule({
   // the style to use for the lines, optional.
   strokeStyle: new Stroke({
@@ -25,8 +35,9 @@ const graticule = new Graticule({
 const map = new Map({
   layers: [
     new TileLayer({
-      source: new OSM(),
+      source: osmSource,
     }),
+    debugLayer,
     graticule,
   ],
   target: 'map',
@@ -41,6 +52,7 @@ 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 showTilesCheckbox = document.getElementById('show-tiles');
 const showGraticuleCheckbox = document.getElementById('show-graticule');
 
 function setProjection(code, name, proj4def, bbox) {
@@ -125,22 +137,14 @@ searchButton.onclick = function (event) {
 };
 
 /**
- * Handle checkbox change event.
+ * Handle checkbox change events.
  */
 renderEdgesCheckbox.onchange = function () {
-  map.getLayers().forEach(function (layer) {
-    if (layer instanceof TileLayer) {
-      const source = layer.getSource();
-      if (source instanceof TileImage) {
-        source.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
-      }
-    }
-  });
+  osmSource.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
+};
+showTilesCheckbox.onchange = function () {
+  debugLayer.setVisible(showTilesCheckbox.checked);
 };
-
-/**
- * Handle checkbox change event.
- */
 showGraticuleCheckbox.onchange = function () {
   graticule.setVisible(showGraticuleCheckbox.checked);
 };