我当前正在使用ReactJS Nodejs应用程序,试图集成OpenLayers。我需要实时(通过socket.io)更改标记的GPS位置。
到目前为止,我想出了此代码:
this.map = new Map({
target: "map",
layers: [
new TileLayer({
source: new XYZ({
attributions: 'Tiles © <a href="https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer">ArcGIS</a>',
url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}'
})
}),
],
view: new View({
center: fromLonLat([-8.455826, 40.168307]),
rotation: 1.1344640138,
easing: 0.5
})
});
var vectorSource = new VectorSource({});
var markersLayer = new VectorLayer({
source: vectorSource,
});
this.map.addLayer(markersLayer);
var point1 = new Point(
fromLonLat([-8.455826, 40.168307])
);
var point2 = new Point(
fromLonLat([-8.456819, 40.166388])
);
var marker = new Feature({
geometry: point1,
name: "My point",
});
vectorSource.addFeature(marker);
var style = new Style({
image: new CircleStyle({
radius: 7,
fill: new Fill({color: 'black'}),
stroke: new Stroke({
color: 'white', width: 2
})
})
});
marker.setStyle(style);
setTimeout(function () {
marker.setGeometry(point2);
marker.getGeometry().translate(40, -40);
}, 3500);
标记的移动,但是过渡是瞬间发生的。有没有办法使其像" CSS线性过渡"一样移动以使其更现实?
使用计时器,您可以将移动沿旧位置和新位置之间的界线分为台阶,例如对于100个10毫秒步骤
var line = new LineString([oldCoordinates, newCoordinates])];
var step = 0;
var key = setInterval( function() {
if (step < 100) {
step++;
marker.setGeometry(new Point(line.getCoordinateAt(step/100)));
} else {
clearInterval(key);
}
}, 10);
您也许还可以在飞行动画示例中基于某些内容https://openlayers.org/en/latest/examples/flight-animation.html