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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"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3ZjQ5ZGUzNC1jNWYwLTQ1ZTMtYmNjYS05YTY4ZTVmN2I2MDkiLCJpZCI6MTE3MTM4LCJpYXQiOjE2NzY0NDUyODB9.ZaNSBIfc1sGLhQd_xqhiSsc0yr8oS0wt1hAo9gbke6M";
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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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let EllipsoidFadeMaterialProperty = function (color, duration) {
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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 = color;
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this.duration = duration;
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this._time = (new Date()).getTime();
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}
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Object.defineProperties(EllipsoidFadeMaterialProperty.prototype, {
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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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EllipsoidFadeMaterialProperty.prototype.getType = function (time) {
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return 'EllipsoidFade';
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}
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EllipsoidFadeMaterialProperty.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.time = (((new Date()).getTime() - this._time) % this.duration) / this.duration;
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return result;
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}
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EllipsoidFadeMaterialProperty.prototype.equals = function (other) {
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return this === other ||
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(other instanceof EllipsoidFadeMaterialProperty &&
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Property.equals(this._color, other._color))
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}
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Cesium.Material.EllipsoidFadeType = 'EllipsoidFade';
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Cesium.Material.EllipsoidFadeSource =
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"czm_material czm_getMaterial(czm_materialInput materialInput)\n" +
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"{\n" +
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"czm_material material = czm_getDefaultMaterial(materialInput);\n" +
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"material.diffuse = 1.5 * color.rgb;\n" +
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"vec2 st = materialInput.st;\n" +
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"float dis = distance(st, vec2(0.5, 0.5));\n" +
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"float per = fract(time);\n" +
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"if(dis > per * 0.5){\n" +
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"material.alpha = 0.0;\n" +
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"discard;\n" +
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"}else {\n" +
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"material.alpha = color.a * dis / per / 1.0;\n" +
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"}\n" +
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"return material;\n" +
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"}";
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Cesium.Material._materialCache.addMaterial(Cesium.Material.EllipsoidFadeType, {
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fabric: {
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type: Cesium.Material.EllipsoidFadeType,
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uniforms: {
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color: new Cesium.Color(1.0, 0.0, 0.0, 1),
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time: 1
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},
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source: Cesium.Material.EllipsoidFadeSource
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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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var entity = new Cesium.Entity({
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ellipse: {
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height: 100,
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semiMinorAxis: 3000.0,
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semiMajorAxis: 3000.0,
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// 3000为毫秒，控制速度
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material: new EllipsoidFadeMaterialProperty(Cesium.Color.RED, 3000)
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},
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id: "temporary",
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position: Cesium.Cartesian3.fromDegrees(121.466139, 31.257341, 0)
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})
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viewer.entities.add(entity)
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viewer.zoomTo(viewer.entities);
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</script>
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</body>
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</html>
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