Layer clipping example
Layer clipping example
<!DOCTYPE html>
<html>
<head>
<title>Layer clipping example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
</div>
<script>
var osm = new ol.layer.Tile({
source: new ol.source.OSM()
});
var map = new ol.Map({
layers: [osm],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
center: [0, 0],
zoom: 2
})
});
osm.on('precompose', function(event) {
var ctx = event.context;
ctx.save();
ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
ctx.scale(3, 3);
ctx.translate(-75, -80);
ctx.beginPath();
ctx.moveTo(75, 40);
ctx.bezierCurveTo(75, 37, 70, 25, 50, 25);
ctx.bezierCurveTo(20, 25, 20, 62.5, 20, 62.5);
ctx.bezierCurveTo(20, 80, 40, 102, 75, 120);
ctx.bezierCurveTo(110, 102, 130, 80, 130, 62.5);
ctx.bezierCurveTo(130, 62.5, 130, 25, 100, 25);
ctx.bezierCurveTo(85, 25, 75, 37, 75, 40);
ctx.clip();
ctx.setTransform(1, 0, 0, 1, 0, 0);
});
osm.on('postcompose', function(event) {
var ctx = event.context;
ctx.restore();
});
</script>
</body>
</html>