cesium-动态编辑primitive探索 ( 五) API实现方式

实际上这种方式为粗暴的移除重新添加。对于单个primitive来说，没有卡顿现象，可以考虑以此种方式来进行；

下一步计划看看entity的property回调如何来实现

let layer=new Cesium.ArcGisMapServerImageryProvider({
    url: 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',
    enablePickFeatures: false
})
var viewer = new Cesium.Viewer('cesiumContainer', {
    imageryProvider: layer,
});


let semiMajorAxis=500000

function addPr(semiMajorAxis) {
    let geometry= new Cesium.EllipseGeometry({
        semiMajorAxis:semiMajorAxis,
        semiMinorAxis : semiMajorAxis,
        extrudedHeight:0,
        center:Cesium.Cartesian3.fromDegrees(119, 40.03883)

    })

  return  new Cesium.Primitive({
        geometryInstances : new Cesium.GeometryInstance({
            geometry: geometry,
        }),
        releaseGeometryInstances:false,
        appearance: new Cesium.EllipsoidSurfaceAppearance({
            material:Cesium.Material.fromType('Stripe')
        }),
        asynchronous:false,
        // show:true
    })
}
let pr=addPr(semiMajorAxis)
console.log(pr)
viewer.scene.primitives.add(pr);
viewer.camera.setView({
    destination: Cesium.Cartesian3.fromDegrees(110.20, 34.55, 3000000)
});
var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
var moveFlag=false
handler.setInputAction(function(movement) {
    if(viewer){
        console.log(viewer.scene.primitives)
        viewer.scene.primitives.remove(pr)
        semiMajorAxis+=500

        pr=addPr(semiMajorAxis)
        viewer.scene.primitives.add(pr)
    }



},Cesium.ScreenSpaceEventType.MOUSE_MOVE);