//以entity方式添加到场景中
function doTest (points) {
let curLinePointsArr = generateCurve(points);
viewer.entities.add({ // 背景线
description: 'background-line',
name: '测试流向',
polyline: {
width: 3,
followSurface: true,
positions: curLinePointsArr,
/* material: new Cesium.PolylineGlowMaterialProperty({
color: new Cesium.Color(255 / 255, 249 / 255, 0, 0.5)
})*/
material: new Cesium.PolylineDashMaterialProperty({
color: new Cesium.Color(255 / 255, 249 / 255, 0, 0.5)
})
}
});
// 尾迹线
viewer.entities.add({
description: 'trail-line',
name: 'test',
polyline: {
width: 5,
positions: curLinePointsArr,
material: new Cesium.PolylineTrailMaterialProperty({ // 尾迹线材质
color: Cesium.Color.fromCssColorString("rgba(118, 233, 241, 1.0)"),
trailLength : 0.2,
period : 5.0
})
}
});
points.forEach(function(point){
var cartesian = Cesium.Cartesian3.fromDegrees(point.x,point.y,point.z);
viewer.entities.add({
position: cartesian,
point: {
color: Cesium.Color.Blue,
pixelSize: 20,
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
}
});
/* viewer.entities.add({
position: cartesian,
label: {
showBackground: false,
style: Cesium.LabelStyle.FILL_AND_OUTLINE,
fillColor: Cesium.Color.Blue,
text: "杆塔模型",
font: "8px sans-serif"
}
});*/
});
}
//生成样条曲线，返回坐标数组
function generateCurve (points) {
var cartesian3s = [];
var times = [];
var time=0;
points.forEach(function(point){
cartesian3s.push(Cesium.Cartesian3.fromDegrees(point.x, point.y, point.z));
times.push(time);
time+=0.1;
});
/*var arr=[];
for(var i=0;i<cartesian3s.length-1;i++){
arr.push(cartesian3s[i]);
var n =parseInt(Cesium.Cartesian3.distance(cartesian3s[i],cartesian3s[i+1]));
var a = new Cesium.Cartesian3();
for(var j=0;j<n;j++){
Cesium.Cartesian3.lerp(cartesian3s[i],cartesian3s[i+1],1,a);
arr.push(a);
}
}
arr.push(cartesian3s[cartesian3s.length-1]);
arr.forEach(function(o){
times.push(time);
time+=0.5;
});*/
let spline = new Cesium.CatmullRomSpline({
times: times,
points: cartesian3s
});
let curvePointsArr = [];
for(let i = 0, len = times.length; i < len; i++){
curvePointsArr.push(spline.evaluate(times[i]));
}
return curvePointsArr;
}
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