124 lines
2.9 KiB
JavaScript
124 lines
2.9 KiB
JavaScript
goog.require('ol.Feature');
|
|
goog.require('ol.Map');
|
|
goog.require('ol.View');
|
|
goog.require('ol.geom.Point');
|
|
goog.require('ol.layer.Vector');
|
|
goog.require('ol.source.Vector');
|
|
goog.require('ol.style.AtlasManager');
|
|
goog.require('ol.style.Circle');
|
|
goog.require('ol.style.Fill');
|
|
goog.require('ol.style.RegularShape');
|
|
goog.require('ol.style.Stroke');
|
|
goog.require('ol.style.Style');
|
|
|
|
var atlasManager = new ol.style.AtlasManager({
|
|
// we increase the default size so that all symbols fit into
|
|
// a single atlas image
|
|
size: 512,
|
|
maxSize: ol.has.WEBGL_MAX_TEXTURE_SIZE});
|
|
|
|
var symbolInfo = [{
|
|
opacity: 1.0,
|
|
scale: 1.0,
|
|
fillColor: 'rgba(255, 153, 0, 0.4)',
|
|
strokeColor: 'rgba(255, 204, 0, 0.2)'
|
|
}, {
|
|
opacity: 0.75,
|
|
scale: 1.25,
|
|
fillColor: 'rgba(70, 80, 224, 0.4)',
|
|
strokeColor: 'rgba(12, 21, 138, 0.2)'
|
|
}, {
|
|
opacity: 0.5,
|
|
scale: 1.5,
|
|
fillColor: 'rgba(66, 150, 79, 0.4)',
|
|
strokeColor: 'rgba(20, 99, 32, 0.2)'
|
|
}, {
|
|
opacity: 1.0,
|
|
scale: 1.0,
|
|
fillColor: 'rgba(176, 61, 35, 0.4)',
|
|
strokeColor: 'rgba(145, 43, 20, 0.2)'
|
|
}];
|
|
|
|
var radiuses = [3, 6, 9, 15, 19, 25];
|
|
var symbolCount = symbolInfo.length * radiuses.length * 2;
|
|
var symbols = [];
|
|
var i, j;
|
|
for (i = 0; i < symbolInfo.length; ++i) {
|
|
var info = symbolInfo[i];
|
|
for (j = 0; j < radiuses.length; ++j) {
|
|
// circle symbol
|
|
symbols.push(new ol.style.Circle({
|
|
opacity: info.opacity,
|
|
scale: info.scale,
|
|
radius: radiuses[j],
|
|
fill: new ol.style.Fill({
|
|
color: info.fillColor
|
|
}),
|
|
stroke: new ol.style.Stroke({
|
|
color: info.strokeColor,
|
|
width: 1
|
|
}),
|
|
// by passing the atlas manager to the symbol,
|
|
// the symbol will be added to an atlas
|
|
atlasManager: atlasManager
|
|
}));
|
|
|
|
// star symbol
|
|
symbols.push(new ol.style.RegularShape({
|
|
points: 8,
|
|
opacity: info.opacity,
|
|
scale: info.scale,
|
|
radius: radiuses[j],
|
|
radius2: radiuses[j] * 0.7,
|
|
angle: 1.4,
|
|
fill: new ol.style.Fill({
|
|
color: info.fillColor
|
|
}),
|
|
stroke: new ol.style.Stroke({
|
|
color: info.strokeColor,
|
|
width: 1
|
|
}),
|
|
atlasManager: atlasManager
|
|
}));
|
|
}
|
|
}
|
|
|
|
var featureCount = 50000;
|
|
var features = new Array(featureCount);
|
|
var feature, geometry;
|
|
var e = 25000000;
|
|
for (i = 0; i < featureCount; ++i) {
|
|
geometry = new ol.geom.Point(
|
|
[2 * e * Math.random() - e, 2 * e * Math.random() - e]);
|
|
feature = new ol.Feature(geometry);
|
|
feature.setStyle(
|
|
new ol.style.Style({
|
|
image: symbols[i % symbolCount]
|
|
})
|
|
);
|
|
features[i] = feature;
|
|
}
|
|
|
|
var vectorSource = new ol.source.Vector({
|
|
features: features
|
|
});
|
|
var vector = new ol.layer.Vector({
|
|
source: vectorSource
|
|
});
|
|
|
|
// Use the "webgl" renderer by default.
|
|
var renderer = exampleNS.getRendererFromQueryString();
|
|
if (!renderer) {
|
|
renderer = 'webgl';
|
|
}
|
|
|
|
var map = new ol.Map({
|
|
renderer: renderer,
|
|
layers: [vector],
|
|
target: document.getElementById('map'),
|
|
view: new ol.View({
|
|
center: [0, 0],
|
|
zoom: 4
|
|
})
|
|
});
|