76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Tile');
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goog.require('ol.proj');
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goog.require('ol.source.BingMaps');
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var key = 'AkGbxXx6tDWf1swIhPJyoAVp06H0s0gDTYslNWWHZ6RoPqMpB9ld5FY1WutX8UoF';
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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 container = document.getElementById('map');
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var map = new ol.Map({
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layers: [roads, imagery],
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target: container,
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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.addEventListener('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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evt.preventDefault();
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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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evt.preventDefault();
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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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container.addEventListener('mousemove', function(event) {
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mousePosition = map.getEventPixel(event);
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map.render();
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});
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container.addEventListener('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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