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feature-animation.js
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feature-animation.js
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goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.Observable');
goog.require('ol.View');
goog.require('ol.control');
goog.require('ol.easing');
goog.require('ol.geom.Point');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.proj');
goog.require('ol.source.OSM');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM({
wrapX: false
})
})
],
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 1
})
});
var source = new ol.source.Vector({
wrapX: false
});
var vector = new ol.layer.Vector({
source: source
});
map.addLayer(vector);
function addRandomFeature() {
var x = Math.random() * 360 - 180;
var y = Math.random() * 180 - 90;
var geom = new ol.geom.Point(ol.proj.transform([x, y],
'EPSG:4326', 'EPSG:3857'));
var feature = new ol.Feature(geom);
source.addFeature(feature);
}
var duration = 3000;
function flash(feature) {
var start = new Date().getTime();
var listenerKey;
function animate(event) {
var vectorContext = event.vectorContext;
var frameState = event.frameState;
var flashGeom = feature.getGeometry().clone();
var elapsed = frameState.time - start;
var elapsedRatio = elapsed / duration;
// radius will be 5 at start and 30 at end.
var radius = ol.easing.easeOut(elapsedRatio) * 25 + 5;
var opacity = ol.easing.easeOut(1 - elapsedRatio);
var style = new ol.style.Style({
image: new ol.style.Circle({
radius: radius,
snapToPixel: false,
stroke: new ol.style.Stroke({
color: 'rgba(255, 0, 0, ' + opacity + ')',
width: 0.25 + opacity
})
})
});
vectorContext.setStyle(style);
vectorContext.drawGeometry(flashGeom);
if (elapsed > duration) {
ol.Observable.unByKey(listenerKey);
return;
}
// tell OL3 to continue postcompose animation
map.render();
}
listenerKey = map.on('postcompose', animate);
}
source.on('addfeature', function(e) {
flash(e.feature);
});
window.setInterval(addRandomFeature, 1000);