Openlayers 3：動畫點功能

Question

我在這里設置了當前設置： 功能齊全的小提琴示例 ，我需要為點功能設置動畫...讓它像Google上的GPS位置一樣脈沖等我發現這篇文章： http ： //openlayers.org/en/ master / examples / feature-animation.html但發現它真的很混亂，不知道如何將它應用到我的代碼中。

這是小提琴的一部分，它創建了點特征並將其應用於地圖......

function locate_me() {
    var locationPoint = new ol.Feature({
        geometry: new ol.geom.Point([0.3901863098144531, 52.803332200169166])
    });
    locationPoint.getGeometry().transform('EPSG:4326', 'EPSG:3857');

    // A vector layer to hold the location point
    var locationLayer = new ol.layer.Vector({
        source: new ol.source.Vector({
            features: [
                locationPoint
            ]
        })
    });
    map.addLayer(locationLayer);
}

Answer 1

隔離並注釋為功能創建閃光效果的功能：

/*
 * @param {ol.Feature}
 * @param {Number} Duration in milliseconds.
 */
function flash(feature, duration) {
  var start = +new Date();
  var listenerKey; // to remove the listener after the duration

  function animate(event) {
    // canvas context where the effect will be drawn
    var vectorContext = event.vectorContext;
    var frameState = event.frameState;

    // create a clone of the original ol.Feature
    // on each browser frame a new style will be applied
    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);

    // you can customize here the style
    // like color, width
    var style = new ol.style.Style({
      image: new ol.style.Circle({
        radius: radius,
        snapToPixel: false,
        stroke: new ol.style.Stroke({
          color: [51, 51, 51, opacity],
          width: 0.25 + opacity
        })
      })
    });

    vectorContext.setStyle(style);
    vectorContext.drawGeometry(flashGeom);
    if (elapsed > duration) { // stop the effect
      ol.Observable.unByKey(listenerKey);
      return;
    }
    // tell OL3 to continue postcompose animation
    map.render();
  }

  listenerKey = map.on('postcompose', animate);
}

用法：

var marker = new ol.Feature(new ol.geom.Point([0, 0]));
var vectorLayer = new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [marker]
  })
});
map.addLayer(vectorLayer);

flash(marker, 2000);