2025-03-11 08:25:45 +00:00
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<!--********************************************************************
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* by jiawanlong
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*********************************************************************-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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2025-03-19 03:00:22 +00:00
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<link rel="stylesheet" href="./../../libs/cesium/Cesium1.98/Widgets/widgets.css" />
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<script type="text/javascript" src="./../../libs/cesium/Cesium1.98/Cesium.js"></script>
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2025-03-11 08:25:45 +00:00
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</head>
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<body style="
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margin: 0;
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overflow: hidden;
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background: #fff;
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width: 100%;
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height: 100%;
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position: absolute;
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top: 0;
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">
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<div id="map" style="margin: 0 auto; width: 100%; height: 100%"></div>
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<script type="text/javascript">
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Cesium.Ion.defaultAccessToken =
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2025-08-06 00:53:05 +00:00
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"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIwNDljNWFmZC03MzRlLTRiMDMtYWIwMi00Yjk4YWQ4NzQwZGEiLCJpZCI6MjU5LCJpYXQiOjE3NTEzNzkyMzR9.OTqPNs3UGNnT1LYkPTavV80wN8Es_YphpJgQcpdnqWc";
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2025-03-11 08:25:45 +00:00
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const viewer = new Cesium.Viewer("map", {
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contextOptions: {
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// requestWebgl1: true,
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},
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});
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viewer.scene.debugShowFramesPerSecond = true;
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viewer.scene.globe.depthTestAgainstTerrain = true;
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/*
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----------------------------------MaterialProperty-----------------------------
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*/
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class PolylineTrailLinkMaterialProperty {
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constructor(options) {
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options = Cesium.defaultValue(options, Cesium.defaultValue.EMPTY_OBJECT);
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this._definitionChanged = new Cesium.Event();
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this._color = undefined;
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this._colorSubscription = undefined;
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this.color = options.color;
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this.duration = Cesium.defaultValue(options.duration, 1000);
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this._time = (new Date()).getTime();
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}
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}
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Object.defineProperties(PolylineTrailLinkMaterialProperty.prototype, {
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isConstant: {
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get: function () {
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return false;
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}
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},
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definitionChanged: {
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get: function () {
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return this._definitionChanged;
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}
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},
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color: Cesium.createPropertyDescriptor('color')
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});
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PolylineTrailLinkMaterialProperty.prototype.getType = function (time) {
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return 'PolylineTrailLink';
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};
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PolylineTrailLinkMaterialProperty.prototype.getValue = function (time, result) {
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if (!Cesium.defined(result)) {
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result = {};
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}
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result.color = Cesium.Property.getValueOrClonedDefault(this._color, time, Cesium.Color.WHITE, result.color);
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result.image = Cesium.Material.PolylineTrailLinkImage;
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result.time = (((new Date()).getTime() - this._time) % this.duration) / this.duration;
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return result;
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};
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PolylineTrailLinkMaterialProperty.prototype.equals = function (other) {
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return this === other ||
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(other instanceof PolylineTrailLinkMaterialProperty && Cesium.Property.equals(this._color, other._color))
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};
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Cesium.PolylineTrailLinkMaterialProperty = PolylineTrailLinkMaterialProperty;
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Cesium.Material.PolylineTrailLinkType = 'PolylineTrailLink';
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Cesium.Material.PolylineTrailLinkImage = "./line1.png";
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Cesium.Material.PolylineTrailLinkSource = `czm_material czm_getMaterial(czm_materialInput materialInput)
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{
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czm_material material = czm_getDefaultMaterial(materialInput);
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vec2 st = materialInput.st;
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//time = speed * czm_frameNumber * 0.001;
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vec4 colorImage = texture(image, vec2(fract(st.s - time), st.t));
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material.alpha = colorImage.a * color.a;
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material.diffuse = color.rgb;
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return material;
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}
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`;
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Cesium.Material._materialCache.addMaterial(Cesium.Material.PolylineTrailLinkType, {
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fabric: {
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type: Cesium.Material.PolylineTrailLinkType,
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uniforms: {
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color: new Cesium.Color(1.0, 0.0, 0.0, 0.5),
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image: Cesium.Material.PolylineTrailLinkImage,
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time: 0,
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},
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source: Cesium.Material.PolylineTrailLinkSource
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},
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translucent: function (material) {
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return true;
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}
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});
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viewer.entities.add({
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polyline: {
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positions: Cesium.Cartesian3.fromDegreesArray([
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-112, 36,
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-100, 38,
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-90, 42
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]),
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width: 3,
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material: new Cesium.PolylineTrailLinkMaterialProperty({
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color: Cesium.Color.fromCssColorString('#7ffeff'),
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duration: 3000,
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}),
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},
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});
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</script>
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</body>
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</html>
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