mirror of https://github.com/CesiumGS/cesium.git
287 lines
9.1 KiB
HTML
287 lines
9.1 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta
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name="viewport"
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content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
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/>
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<meta name="description" content="Particle systems for rocket and comet tails." />
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<meta name="cesium-sandcastle-labels" content="Beginner, Showcases, Tutorials" />
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<title>Cesium Demo</title>
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<script type="text/javascript" src="../Sandcastle-header.js"></script>
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<script
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type="text/javascript"
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src="../../../Build/CesiumUnminified/Cesium.js"
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nomodule
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></script>
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<script type="module" src="../load-cesium-es6.js"></script>
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</head>
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<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
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<style>
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@import url(../templates/bucket.css);
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</style>
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<div id="cesiumContainer" class="fullSize"></div>
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<div id="loadingOverlay"><h1>Loading...</h1></div>
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<div id="toolbar"></div>
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<script id="cesium_sandcastle_script">
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window.startup = async function (Cesium) {
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"use strict";
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//Sandcastle_Begin
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const viewer = new Cesium.Viewer("cesiumContainer", {
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shouldAnimate: true,
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});
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const planePosition = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 800.0);
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const particlesOffset = new Cesium.Cartesian3(
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-8.950115473940969,
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34.852766731753945,
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-30.235411095432937,
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);
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const cameraLocation = Cesium.Cartesian3.add(
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planePosition,
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particlesOffset,
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new Cesium.Cartesian3(),
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);
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const resetCamera = function () {
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viewer.camera.lookAt(cameraLocation, new Cesium.Cartesian3(-450, -300, 200));
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};
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resetCamera();
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// Draw particle image to a canvas
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let particleCanvas;
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function getImage() {
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if (!Cesium.defined(particleCanvas)) {
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particleCanvas = document.createElement("canvas");
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particleCanvas.width = 20;
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particleCanvas.height = 20;
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const context2D = particleCanvas.getContext("2d");
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context2D.beginPath();
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context2D.arc(8, 8, 8, 0, Cesium.Math.TWO_PI, true);
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context2D.closePath();
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context2D.fillStyle = "rgb(255, 255, 255)";
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context2D.fill();
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}
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return particleCanvas;
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}
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// Add plane to scene
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const hpr = new Cesium.HeadingPitchRoll(0.0, Cesium.Math.PI_OVER_TWO, 0.0);
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const orientation = Cesium.Transforms.headingPitchRollQuaternion(
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planePosition,
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hpr,
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);
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const entity = viewer.entities.add({
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model: {
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uri: "../../SampleData/models/CesiumAir/Cesium_Air.glb",
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scale: 3.5,
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},
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position: planePosition,
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orientation: orientation,
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});
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// creating particles model matrix
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const translationOffset = Cesium.Matrix4.fromTranslation(
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particlesOffset,
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new Cesium.Matrix4(),
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);
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const translationOfPlane = Cesium.Matrix4.fromTranslation(
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planePosition,
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new Cesium.Matrix4(),
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);
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const particlesModelMatrix = Cesium.Matrix4.multiplyTransformation(
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translationOfPlane,
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translationOffset,
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new Cesium.Matrix4(),
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);
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// creating the particle systems
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const rocketOptions = {
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numberOfSystems: 50.0,
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iterationOffset: 0.1,
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cartographicStep: 0.000001,
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baseRadius: 0.0005,
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colorOptions: [
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{
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minimumRed: 1.0,
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green: 0.5,
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minimumBlue: 0.05,
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alpha: 1.0,
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},
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{
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red: 0.9,
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minimumGreen: 0.6,
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minimumBlue: 0.01,
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alpha: 1.0,
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},
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{
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red: 0.8,
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green: 0.05,
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minimumBlue: 0.09,
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alpha: 1.0,
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},
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{
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minimumRed: 1,
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minimumGreen: 0.05,
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blue: 0.09,
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alpha: 1.0,
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},
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],
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};
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const cometOptions = {
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numberOfSystems: 100.0,
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iterationOffset: 0.003,
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cartographicStep: 0.0000001,
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baseRadius: 0.0005,
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colorOptions: [
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{
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red: 0.6,
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green: 0.6,
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blue: 0.6,
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alpha: 1.0,
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},
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{
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red: 0.6,
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green: 0.6,
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blue: 0.9,
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alpha: 0.9,
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},
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{
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red: 0.5,
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green: 0.5,
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blue: 0.7,
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alpha: 0.5,
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},
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],
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};
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let scratchCartesian3 = new Cesium.Cartesian3();
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let scratchCartographic = new Cesium.Cartographic();
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const forceFunction = function (options, iteration) {
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return function (particle, dt) {
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dt = Cesium.Math.clamp(dt, 0.0, 0.05);
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scratchCartesian3 = Cesium.Cartesian3.normalize(
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particle.position,
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new Cesium.Cartesian3(),
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);
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scratchCartesian3 = Cesium.Cartesian3.multiplyByScalar(
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scratchCartesian3,
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-40.0 * dt,
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scratchCartesian3,
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);
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scratchCartesian3 = Cesium.Cartesian3.add(
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particle.position,
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scratchCartesian3,
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scratchCartesian3,
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);
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scratchCartographic = Cesium.Cartographic.fromCartesian(
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scratchCartesian3,
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Cesium.Ellipsoid.WGS84,
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scratchCartographic,
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);
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const angle = (Cesium.Math.PI * 2.0 * iteration) / options.numberOfSystems;
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iteration += options.iterationOffset;
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scratchCartographic.longitude +=
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Math.cos(angle) * options.cartographicStep * 30.0 * dt;
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scratchCartographic.latitude +=
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Math.sin(angle) * options.cartographicStep * 30.0 * dt;
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particle.position = Cesium.Cartographic.toCartesian(scratchCartographic);
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};
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};
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const matrix4Scratch = new Cesium.Matrix4();
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let scratchAngleForOffset = 0.0;
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const scratchOffset = new Cesium.Cartesian3();
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const imageSize = new Cesium.Cartesian2(15.0, 15.0);
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function createParticleSystems(options, systemsArray) {
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const length = options.numberOfSystems;
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for (let i = 0; i < length; ++i) {
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scratchAngleForOffset = (Math.PI * 2.0 * i) / options.numberOfSystems;
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scratchOffset.x += options.baseRadius * Math.cos(scratchAngleForOffset);
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scratchOffset.y += options.baseRadius * Math.sin(scratchAngleForOffset);
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const emitterModelMatrix = Cesium.Matrix4.fromTranslation(
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scratchOffset,
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matrix4Scratch,
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);
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const color = Cesium.Color.fromRandom(
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options.colorOptions[i % options.colorOptions.length],
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);
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const force = forceFunction(options, i);
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const item = viewer.scene.primitives.add(
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new Cesium.ParticleSystem({
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image: getImage(),
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startColor: color,
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endColor: color.withAlpha(0.0),
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particleLife: 3.5,
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speed: 0.00005,
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imageSize: imageSize,
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emissionRate: 30.0,
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emitter: new Cesium.CircleEmitter(0.1),
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lifetime: 0.1,
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updateCallback: force,
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modelMatrix: particlesModelMatrix,
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emitterModelMatrix: emitterModelMatrix,
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}),
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);
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systemsArray.push(item);
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}
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}
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const rocketSystems = [];
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const cometSystems = [];
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createParticleSystems(rocketOptions, rocketSystems);
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createParticleSystems(cometOptions, cometSystems);
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// toolbar elements
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function showAll(systemsArray, show) {
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const length = systemsArray.length;
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for (let i = 0; i < length; ++i) {
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systemsArray[i].show = show;
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}
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}
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const options = [
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{
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text: "Comet Tail",
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onselect: function () {
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showAll(rocketSystems, false);
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showAll(cometSystems, true);
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resetCamera();
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},
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},
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{
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text: "Rocket Thruster",
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onselect: function () {
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showAll(cometSystems, false);
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showAll(rocketSystems, true);
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resetCamera();
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},
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},
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];
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Sandcastle.addToolbarMenu(options);
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showAll(cometSystems, true);
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//Sandcastle_End
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};
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if (typeof Cesium !== "undefined") {
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window.startupCalled = true;
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window.startup(Cesium).catch((error) => {
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"use strict";
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console.error(error);
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});
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Sandcastle.finishedLoading();
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}
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</script>
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</body>
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</html>
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