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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Geo Feature Explorer</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.1.0/css/ol.css" type="text/css">
<style>
textarea {
width: 500px;
height: 200px;
font: 12px Monaco, Courier, monospace;
}
</style>
</head>
<body>
<textarea class="js-wkt"></textarea>
<textarea class="js-selected-feature"></textarea>
<div id="map"></div>
<script src="https://openlayers.org/en/v4.1.0/build/ol.js"></script>
<script>
var input_el = document.getElementsByClassName('js-wkt')[0];
var output_el = document.getElementsByClassName('js-selected-feature')[0];
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var format = new ol.format.WKT();
var vector_style = new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#0091ff',
width: 5
})
});
var map = new ol.Map({
layers: [raster],
target: 'map',
view: new ol.View({
center: ol.proj.fromLonLat([2.3475075, 48.869163]),
zoom: 16
})
});
var select_click = new ol.interaction.Select({
condition: ol.events.condition.click
});
select_click.on('select', function(e) {
if (e.selected.length) {
var feature = e.selected[0];
output_el.textContent = format.writeFeature(feature, {
dataProjection: 'EPSG:4326',
featureProjection: 'EPSG:3857'
});
}
});
map.addInteraction(select_click);
var wkt_layer;
input_el.onblur = function(e) {
// Remove old WKT layer
if (wkt_layer) {
map.removeLayer(wkt_layer);
}
var wkt_features = e.target.value.split('\n');
wkt_features = wkt_features.map(function(wkt) {
return format.readFeature(wkt, {
dataProjection: 'EPSG:4326',
featureProjection: 'EPSG:3857'
});
});
wkt_layer = new ol.layer.Vector({
source: new ol.source.Vector({
features: wkt_features
}),
style: vector_style
});
map.addLayer(wkt_layer);
};
</script>
</body>
</html>
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