223 lines
8.2 KiB
HTML
223 lines
8.2 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism.css" type="text/css">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="./resources/zeroclipboard/ZeroClipboard.min.js"></script>
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<title>Layer Spy Example</title>
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</head>
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<body>
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<header class="navbar" role="navigation">
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<div class="container" id="navbar-inner-container">
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<a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png"> OpenLayers 3 Examples</a>
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</div>
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</header>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Layer Spy Example</h4>
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<p id="shortdesc">View a portion of one layer over another</p>
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<div id="docs"><p>Layer rendering can be manipulated in <code>precompose</code> and <code>postcompose</code> event listeners. These listeners get an event with a reference to the Canvas rendering context. In this example, the <code>precompose</code> listener sets a clipping mask around the most recent mouse position, giving you a spyglass effect for viewing one layer over another.</p> <p>Move around the map to see the effect. Use the ↑ up and ↓ down arrow keys to adjust the spyglass size.</p>
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</div>
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<div id="tags">spy, image manipulation</div>
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<div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.BingMaps.html" title="API documentation for ol.source.BingMaps">ol.source.BingMaps</a></li></ul></div>
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</div>
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</div>
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<div class="row-fluid">
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<div id="source-controls">
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<a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
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<a id="jsfiddle-button"><i class="fa fa-jsfiddle"></i> Edit</a>
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</div>
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<form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
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<textarea class="hidden" name="js">var key = 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3';
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var roads = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Road'})
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});
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var imagery = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Aerial'})
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});
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var map = new ol.Map({
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layers: [roads, imagery],
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target: 'map',
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view: new ol.View({
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center: ol.proj.fromLonLat([-109, 46.5]),
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zoom: 6
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})
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});
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var radius = 75;
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$(document).keydown(function(evt) {
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if (evt.which === 38) {
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radius = Math.min(radius + 5, 150);
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map.render();
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} else if (evt.which === 40) {
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radius = Math.max(radius - 5, 25);
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map.render();
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}
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});
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// get the pixel position with every move
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var mousePosition = null;
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$(map.getViewport()).on('mousemove', function(evt) {
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mousePosition = map.getEventPixel(evt.originalEvent);
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map.render();
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}).on('mouseout', function() {
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mousePosition = null;
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map.render();
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});
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// before rendering the layer, do some clipping
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imagery.on('precompose', function(event) {
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var ctx = event.context;
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var pixelRatio = event.frameState.pixelRatio;
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ctx.save();
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ctx.beginPath();
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if (mousePosition) {
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// only show a circle around the mouse
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ctx.arc(mousePosition[0] * pixelRatio, mousePosition[1] * pixelRatio,
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radius * pixelRatio, 0, 2 * Math.PI);
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ctx.lineWidth = 5 * pixelRatio;
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ctx.strokeStyle = 'rgba(0,0,0,0.5)';
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ctx.stroke();
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}
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ctx.clip();
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});
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// after rendering the layer, restore the canvas context
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imagery.on('postcompose', function(event) {
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var ctx = event.context;
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ctx.restore();
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});
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</textarea>
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<textarea class="hidden" name="css"></textarea>
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<textarea class="hidden" name="html"><div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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</textarea>
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<input type="hidden" name="wrap" value="l">
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<input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.9.0/css/ol.css,http://openlayers.org/en/v3.9.0/build/ol.js">
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</form>
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<pre><code id="example-source" class="language-markup"><!DOCTYPE html>
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<html>
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<head>
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<title>Layer Spy Example</title>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
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<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>
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</head>
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<body>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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</div>
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<script>
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var key = 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3';
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var roads = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Road'})
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});
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var imagery = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Aerial'})
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});
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var map = new ol.Map({
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layers: [roads, imagery],
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target: 'map',
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view: new ol.View({
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center: ol.proj.fromLonLat([-109, 46.5]),
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zoom: 6
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})
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});
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var radius = 75;
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$(document).keydown(function(evt) {
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if (evt.which === 38) {
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radius = Math.min(radius + 5, 150);
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map.render();
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} else if (evt.which === 40) {
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radius = Math.max(radius - 5, 25);
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map.render();
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}
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});
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// get the pixel position with every move
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var mousePosition = null;
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$(map.getViewport()).on('mousemove', function(evt) {
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mousePosition = map.getEventPixel(evt.originalEvent);
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map.render();
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}).on('mouseout', function() {
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mousePosition = null;
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map.render();
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});
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// before rendering the layer, do some clipping
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imagery.on('precompose', function(event) {
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var ctx = event.context;
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var pixelRatio = event.frameState.pixelRatio;
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ctx.save();
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ctx.beginPath();
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if (mousePosition) {
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// only show a circle around the mouse
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ctx.arc(mousePosition[0] * pixelRatio, mousePosition[1] * pixelRatio,
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radius * pixelRatio, 0, 2 * Math.PI);
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ctx.lineWidth = 5 * pixelRatio;
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ctx.strokeStyle = 'rgba(0,0,0,0.5)';
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ctx.stroke();
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}
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ctx.clip();
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});
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// after rendering the layer, restore the canvas context
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imagery.on('postcompose', function(event) {
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var ctx = event.context;
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ctx.restore();
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});
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</script>
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</body>
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</html></code></pre>
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</div>
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</div>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<script src="./resources/common.js"></script>
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<script src="./resources/prism/prism.min.js"></script>
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<script src="loader.js?id=layer-spy"></script>
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</body>
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</html>
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