解决OpenLayers postcompose事件event.vectorContext获取失败的问题？-灵析社区
米斯达openlayers 使用地图postcompose事件event.vectorContext 为什么获取不到呢？ 通过openlayers添加点然后实现点位闪烁效果 flash(feature) { var _this = this; var start = new Date().getTime(); var listenerKey; function animate(event) { debugger; var duration = 1000; var vectorContext = event.vectorContext; var frameState = event.frameState; var flashGeom = feature.getGeometry().clone(); var elapsed = frameState.time - start; var elapsedRatio = elapsed / duration; // var radius = ol.easing.easeOut(elapsedRatio) * 6 + 5; // var opacity = ol.easing.easeOut(1 - elapsedRatio); var radius = 10; var opacity = 1; console.log("radius：：：" + radius + "：：：opacity：：：" + opacity) var style = new Style({ image: new Circle({ radius: radius, snapToPixel: false, stroke: new 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; } _this.map.render(); } listenerKey = _this.map.on('postcompose', animate); }
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