46054b8543
The UTFGrid layer's `getTileInfo` method was not correctly handling dateline wrapping (and was a bit more complicated than it needed to be). Since it would be useful to all grid layers to be able to retrieve a tile and pixel offset for any map location, this functionality deserves to be on the Grid layer. The WMTS layer currently exposes a `getTileInfo` method that is used within the layer and by the WMTSGetFeatureInfo control. This method could be renamed to `getRemoteTileInfo` or something to differentiate it from a method that gets locally cached tile info. Until that change is made, the method on the Grid layer will be called `getGridData`.
63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
var osm = new OpenLayers.Layer.XYZ(
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"MapQuest OSM",
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[
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"http://otile1.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
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"http://otile2.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
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"http://otile3.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
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"http://otile4.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png"
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],
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{transitionEffect: "resize", wrapDateLine: true}
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);
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var utfgrid = new OpenLayers.Layer.UTFGrid({
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url: "utfgrid/geography-class/${z}/${x}/${y}.grid.json",
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utfgridResolution: 4, // default is 2
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displayInLayerSwitcher: false
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});
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var map = new OpenLayers.Map({
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div: "map",
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projection: "EPSG:900913",
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numZoomLevels: 3,
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layers: [osm, utfgrid],
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controls: [
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new OpenLayers.Control.Navigation({
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dragPanOptions: {
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enableKinetic: true
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}
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}),
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new OpenLayers.Control.Zoom()
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],
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center: [0, 0],
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zoom: 1
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});
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var output = document.getElementById("output");
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var flag = document.getElementById("flag");
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var callback = function(infoLookup, loc, pixel) {
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var msg = "";
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if (infoLookup) {
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var info;
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for (var idx in infoLookup) {
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// idx can be used to retrieve layer from map.layers[idx]
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info = infoLookup[idx];
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if (info && info.data) {
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output.innerHTML = info.data.admin;
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flag.innerHTML = "<img src='data:image/png;base64," + info.data.flag_png + "'>";
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flag.style.left = (pixel.x + 15) + "px";
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flag.style.top = (pixel.y + 15) + "px";
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} else {
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output.innerHTML = flag.innerHTML = " ";
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}
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}
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}
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};
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var control = new OpenLayers.Control.UTFGrid({
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callback: callback,
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handlerMode: "move"
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});
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map.addControl(control);
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