72 lines
2.0 KiB
JavaScript
72 lines
2.0 KiB
JavaScript
goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.format.KML');
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goog.require('ol.geom.Polygon');
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goog.require('ol.layer.Tile');
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goog.require('ol.layer.Vector');
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goog.require('ol.render');
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goog.require('ol.source.Stamen');
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goog.require('ol.source.Vector');
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goog.require('ol.style.Fill');
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goog.require('ol.style.Icon');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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var styleCache = {};
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var styleFunction = function(feature) {
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// 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
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// standards-violating <magnitude> tag in each Placemark. We extract it from
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// the Placemark's name instead.
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var name = feature.get('name');
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var magnitude = parseFloat(name.substr(2));
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var size = parseInt(10 + 40 * (magnitude - 5), 10);
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var style = styleCache[size];
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if (!style) {
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var canvas =
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/** @type {HTMLCanvasElement} */ (document.createElement('canvas'));
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var render = ol.render.toContext(
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/** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d')),
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{size: [size + 2, size + 2], pixelRatio: size / 10});
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render.setFillStrokeStyle(
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new ol.style.Fill({color: 'rgba(255, 153, 0, 0.4)'}),
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new ol.style.Stroke({color: 'rgba(255, 204, 0, 0.2)', width: 1}));
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render.drawPolygonGeometry(new ol.geom.Polygon(
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[[[0, 0], [4, 2], [6, 0], [10, 5], [6, 3], [4, 5], [0, 0]]]));
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style = new ol.style.Style({
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image: new ol.style.Icon({
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img: canvas,
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imgSize: [canvas.width, canvas.height],
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rotation: 1.2
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})
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});
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styleCache[size] = style;
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}
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return style;
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};
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var vector = new ol.layer.Vector({
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source: new ol.source.Vector({
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url: 'data/kml/2012_Earthquakes_Mag5.kml',
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format: new ol.format.KML({
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extractStyles: false
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})
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}),
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style: styleFunction
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});
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var raster = new ol.layer.Tile({
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source: new ol.source.Stamen({
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layer: 'toner'
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})
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});
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var map = new ol.Map({
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layers: [raster, vector],
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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zoom: 2
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})
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});
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