1 | goog.require('ol.Map');
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2 | goog.require('ol.View');
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3 | goog.require('ol.format.KML');
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4 | goog.require('ol.geom.Polygon');
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5 | goog.require('ol.layer.Tile');
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6 | goog.require('ol.layer.Vector');
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7 | goog.require('ol.render');
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8 | goog.require('ol.source.Stamen');
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9 | goog.require('ol.source.Vector');
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10 | goog.require('ol.style.Fill');
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11 | goog.require('ol.style.Icon');
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12 | goog.require('ol.style.Stroke');
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13 | goog.require('ol.style.Style');
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14 |
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15 |
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16 | var symbol = [[0, 0], [4, 2], [6, 0], [10, 5], [6, 3], [4, 5], [0, 0]];
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17 | var scale;
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18 | var scaleFunction = function(coordinate) {
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19 | return [coordinate[0] * scale, coordinate[1] * scale];
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20 | };
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21 |
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22 | var styleCache = {};
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23 | var styleFunction = function(feature) {
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24 |
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25 |
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26 |
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27 | var name = feature.get('name');
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28 | var magnitude = parseFloat(name.substr(2));
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29 | var size = parseInt(10 + 40 * (magnitude - 5), 10);
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30 | scale = size / 10;
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31 | var style = styleCache[size];
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32 | if (!style) {
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33 | var canvas =
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34 | (document.createElement('canvas'));
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35 | var vectorContext = ol.render.toContext(
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36 | (canvas.getContext('2d')),
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37 | {size: [size, size], pixelRatio: 1});
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38 | vectorContext.setStyle(new ol.style.Style({
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39 | fill: new ol.style.Fill({color: 'rgba(255, 153, 0, 0.4)'}),
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40 | stroke: new ol.style.Stroke({color: 'rgba(255, 204, 0, 0.2)', width: 2})
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41 | }));
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42 | vectorContext.drawGeometry(new ol.geom.Polygon([symbol.map(scaleFunction)]));
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43 | style = new ol.style.Style({
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44 | image: new ol.style.Icon({
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45 | img: canvas,
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46 | imgSize: [size, size],
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47 | rotation: 1.2
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48 | })
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49 | });
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50 | styleCache[size] = style;
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51 | }
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52 | return style;
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53 | };
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54 |
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55 | var vector = new ol.layer.Vector({
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56 | source: new ol.source.Vector({
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57 | url: 'data/kml/2012_Earthquakes_Mag5.kml',
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58 | format: new ol.format.KML({
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59 | extractStyles: false
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60 | })
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61 | }),
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62 | style: styleFunction
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63 | });
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64 |
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65 | var raster = new ol.layer.Tile({
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66 | source: new ol.source.Stamen({
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67 | layer: 'toner'
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68 | })
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69 | });
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70 |
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71 | var map = new ol.Map({
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72 | layers: [raster, vector],
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73 | target: 'map',
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74 | view: new ol.View({
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75 | center: [0, 0],
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76 | zoom: 2
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77 | })
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78 | });
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