mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-07-04 15:17:36 +00:00
180 lines
7.8 KiB
HTML
180 lines
7.8 KiB
HTML
<!--********************************************************************
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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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<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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</head>
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<body style="margin: 0; overflow: hidden; background: #fff; width: 100%; height: 100%; position: absolute; top: 0">
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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 = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIyMjBhMzcxMC0wNjBiLTRmYjItYjY1MC0wMzAwMzMyMGUyMmEiLCJpZCI6MzAzNzc3LCJpYXQiOjE3NDc2Mzk0NTV9.E_90aKtVdzRGlU2z48VwJ4mWvl-uuDkfQBCOO6zbzn4'
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const viewer = new Cesium.Viewer('map', {});
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viewer.scene.debugShowFramesPerSecond = true;
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viewer.scene.globe.depthTestAgainstTerrain = true;
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//喷雾特效
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//烟特效
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class smokeEffect {
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constructor(viewer, obj) {
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this.viewer = viewer
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this.viewModel = {
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emissionRate: 5,
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gravity: 0.0,//设置重力参数
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minimumParticleLife: 1,
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maximumParticleLife: 6,
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minimumSpeed: 1.0,//粒子发射的最小速度
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maximumSpeed: 4.0,//粒子发射的最大速度
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startScale: 0.0,
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endScale: 10.0,
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particleSize: 25.0,
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}
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this.emitterModelMatrix = new Cesium.Matrix4()
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this.translation = new Cesium.Cartesian3()
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this.rotation = new Cesium.Quaternion()
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this.hpr = new Cesium.HeadingPitchRoll()
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this.trs = new Cesium.TranslationRotationScale()
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this.scene = this.viewer.scene
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this.particleSystem = ''
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this.entity = this.viewer.entities.add({
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//选择粒子放置的坐标
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position: Cesium.Cartesian3.fromDegrees(
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obj.lng, obj.lat, 100
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),
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});
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this.init();
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}
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init() {
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const _this = this
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this.viewer.clock.shouldAnimate = true;
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this.viewer.scene.globe.depthTestAgainstTerrain = false;
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// this.viewer.trackedEntity = this.entity;
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var particleSystem = this.scene.primitives.add(
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new Cesium.ParticleSystem({
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image: './smoke.png',//生成所需粒子的图片路径
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//粒子在生命周期开始时的颜色
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startColor: Cesium.Color.BLACK.withAlpha(0.7),
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//粒子在生命周期结束时的颜色
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endColor: Cesium.Color.WHITE.withAlpha(0.3),
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//粒子在生命周期开始时初始比例
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startScale: _this.viewModel.startScale,
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//粒子在生命周期结束时比例
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endScale: _this.viewModel.endScale,
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//粒子发射的最小速度
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minimumParticleLife: _this.viewModel.minimumParticleLife,
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//粒子发射的最大速度
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maximumParticleLife: _this.viewModel.maximumParticleLife,
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//粒子质量的最小界限
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minimumSpeed: _this.viewModel.minimumSpeed,
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//粒子质量的最大界限
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maximumSpeed: _this.viewModel.maximumSpeed,
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//以像素为单位缩放粒子图像尺寸
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imageSize: new Cesium.Cartesian2(
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_this.viewModel.particleSize,
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_this.viewModel.particleSize
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),
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//每秒发射的粒子数
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emissionRate: _this.viewModel.emissionRate,
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//粒子系统发射粒子的时间（秒）
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lifetime: 16.0,
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//设置粒子的大小是否以米或像素为单位
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sizeInMeters: true,
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//系统的粒子发射器
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emitter: new Cesium.CircleEmitter(2.0),//BoxEmitter 盒形发射器，ConeEmitter 锥形发射器，SphereEmitter 球形发射器，CircleEmitter圆形发射器
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//回调函数，实现各种喷泉、烟雾效果
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updateCallback: (p, dt) => {
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return this.applyGravity(p, dt);
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},
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})
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);
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this.particleSystem = particleSystem;
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this.preUpdateEvent()
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}
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//场景渲染事件
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preUpdateEvent() {
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let _this = this;
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this.viewer.scene.preUpdate.addEventListener(function (scene, time) {
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//发射器地理位置
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_this.particleSystem.modelMatrix = _this.computeModelMatrix(_this.entity, time);
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//发射器局部位置
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_this.particleSystem.emitterModelMatrix = _this.computeEmitterModelMatrix();
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// 将发射器旋转
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if (_this.viewModel.spin) {
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_this.viewModel.heading += 1.0;
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_this.viewModel.pitch += 1.0;
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_this.viewModel.roll += 1.0;
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}
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});
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}
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computeModelMatrix(entity, time) {
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return entity.computeModelMatrix(time, new Cesium.Matrix4());
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}
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computeEmitterModelMatrix() {
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this.hpr = Cesium.HeadingPitchRoll.fromDegrees(0.0, 0.0, 0.0, this.hpr);
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this.trs.translation = Cesium.Cartesian3.fromElements(
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-4.0,
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0.0,
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1.4,
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this.translation
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);
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this.trs.rotation = Cesium.Quaternion.fromHeadingPitchRoll(this.hpr, this.rotation);
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return Cesium.Matrix4.fromTranslationRotationScale(
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this.trs,
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this.emitterModelMatrix
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);
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}
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applyGravity(p, dt) {
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var gravityScratch = new Cesium.Cartesian3()
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var position = p.position
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Cesium.Cartesian3.normalize(position, gravityScratch)
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Cesium.Cartesian3.fromElements(
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20 * dt,
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30 * dt,
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gravityScratch.y * dt,
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gravityScratch
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);
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p.velocity = Cesium.Cartesian3.add(p.velocity, gravityScratch, p.velocity)
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}
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removeEvent() {
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this.viewer.scene.preUpdate.removeEventListener(this.preUpdateEvent, this);
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this.emitterModelMatrix = undefined;
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this.translation = undefined;
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this.rotation = undefined;
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this.hpr = undefined;
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this.trs = undefined;
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}
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//移除粒子特效
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remove() {
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() => { return this.removeEvent() }; //清除事件
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this.viewer.scene.primitives.remove(this.particleSystem); //删除粒子对象
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this.viewer.entities.remove(this.entity); //删除entity
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}
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}
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new smokeEffect(viewer, {
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lng: -117.16,
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lat: 32.71
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})
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viewer.camera.setView({
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destination: Cesium.Cartesian3.fromDegrees(-117.16, 32.71, 1500.0)
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});
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</script>
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</body>
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</html> |