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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta name="description" content="Particle systems." />
    <meta name="cesium-sandcastle-labels" content="Beginner, Showcases" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);

      #toolbar {
        background: rgba(42, 42, 42, 0.8);
        padding: 4px;
        border-radius: 4px;
      }

      #toolbar input {
        vertical-align: middle;
        padding-top: 2px;
        padding-bottom: 2px;
      }

      #toolbar .header {
        font-weight: bold;
      }
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar">
      <table>
        <tbody>
          <tr>
            <td>Rate</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="100.0"
                step="1"
                data-bind="value: emissionRate, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: emissionRate" />
            </td>
          </tr>

          <tr>
            <td>Size</td>
            <td>
              <input
                type="range"
                min="2"
                max="60.0"
                step="1"
                data-bind="value: particleSize, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: particleSize" />
            </td>
          </tr>

          <tr>
            <td>Min Life</td>
            <td>
              <input
                type="range"
                min="0.1"
                max="30.0"
                step="1"
                data-bind="value: minimumParticleLife, valueUpdate: 'input'"
              />
              <input
                type="text"
                size="5"
                data-bind="value: minimumParticleLife"
              />
            </td>
          </tr>

          <tr>
            <td>Max Life</td>
            <td>
              <input
                type="range"
                min="0.1"
                max="30.0"
                step="1"
                data-bind="value: maximumParticleLife, valueUpdate: 'input'"
              />
              <input
                type="text"
                size="5"
                data-bind="value: maximumParticleLife"
              />
            </td>
          </tr>

          <tr>
            <td>Min Speed</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="30.0"
                step="1"
                data-bind="value: minimumSpeed, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: minimumSpeed" />
            </td>
          </tr>

          <tr>
            <td>Max Speed</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="30.0"
                step="1"
                data-bind="value: maximumSpeed, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: maximumSpeed" />
            </td>
          </tr>

          <tr>
            <td>Start Scale</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="10.0"
                step="1"
                data-bind="value: startScale, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: startScale" />
            </td>
          </tr>

          <tr>
            <td>End Scale</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="10.0"
                step="1"
                data-bind="value: endScale, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: endScale" />
            </td>
          </tr>

          <tr>
            <td>Gravity</td>
            <td>
              <input
                type="range"
                min="-20.0"
                max="20.0"
                step="1"
                data-bind="value: gravity, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: gravity" />
            </td>
          </tr>
        </tbody>
      </table>
    </div>

    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        var viewer = new Cesium.Viewer("cesiumContainer");

        //Set the random number seed for consistent results.
        Cesium.Math.setRandomNumberSeed(3);

        //Set bounds of our simulation time
        var start = Cesium.JulianDate.fromDate(new Date(2015, 2, 25, 16));
        var stop = Cesium.JulianDate.addSeconds(
          start,
          120,
          new Cesium.JulianDate()
        );

        //Make sure viewer is at the desired time.
        viewer.clock.startTime = start.clone();
        viewer.clock.stopTime = stop.clone();
        viewer.clock.currentTime = start.clone();
        viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP; //Loop at the end
        viewer.clock.multiplier = 1;
        viewer.clock.shouldAnimate = true;

        //Set timeline to simulation bounds
        viewer.timeline.zoomTo(start, stop);

        var viewModel = {
          emissionRate: 5.0,
          gravity: 0.0,
          minimumParticleLife: 1.2,
          maximumParticleLife: 1.2,
          minimumSpeed: 1.0,
          maximumSpeed: 4.0,
          startScale: 1.0,
          endScale: 5.0,
          particleSize: 25.0,
        };

        Cesium.knockout.track(viewModel);
        var toolbar = document.getElementById("toolbar");
        Cesium.knockout.applyBindings(viewModel, toolbar);

        var entityPosition = new Cesium.Cartesian3();
        var entityOrientation = new Cesium.Quaternion();
        var rotationMatrix = new Cesium.Matrix3();
        var modelMatrix = new Cesium.Matrix4();

        function computeModelMatrix(entity, time) {
          return entity.computeModelMatrix(time, new Cesium.Matrix4());
        }

        var emitterModelMatrix = new Cesium.Matrix4();
        var translation = new Cesium.Cartesian3();
        var rotation = new Cesium.Quaternion();
        var hpr = new Cesium.HeadingPitchRoll();
        var trs = new Cesium.TranslationRotationScale();

        function computeEmitterModelMatrix() {
          hpr = Cesium.HeadingPitchRoll.fromDegrees(0.0, 0.0, 0.0, hpr);
          trs.translation = Cesium.Cartesian3.fromElements(
            -4.0,
            0.0,
            1.4,
            translation
          );
          trs.rotation = Cesium.Quaternion.fromHeadingPitchRoll(hpr, rotation);

          return Cesium.Matrix4.fromTranslationRotationScale(
            trs,
            emitterModelMatrix
          );
        }

        var pos1 = Cesium.Cartesian3.fromDegrees(
          -75.15787310614596,
          39.97862668312678
        );
        var pos2 = Cesium.Cartesian3.fromDegrees(
          -75.1633691390455,
          39.95355089912078
        );
        var position = new Cesium.SampledPositionProperty();

        position.addSample(start, pos1);
        position.addSample(stop, pos2);

        var entity = viewer.entities.add({
          availability: new Cesium.TimeIntervalCollection([
            new Cesium.TimeInterval({
              start: start,
              stop: stop,
            }),
          ]),
          model: {
            uri: "../../SampleData/models/CesiumMilkTruck/CesiumMilkTruck.glb",
            minimumPixelSize: 64,
          },
          viewFrom: new Cesium.Cartesian3(-100.0, 0.0, 100.0),
          position: position,
          orientation: new Cesium.VelocityOrientationProperty(position),
        });
        viewer.trackedEntity = entity;

        var scene = viewer.scene;
        var particleSystem = scene.primitives.add(
          new Cesium.ParticleSystem({
            image: "../../SampleData/smoke.png",

            startColor: Cesium.Color.LIGHTSEAGREEN.withAlpha(0.7),
            endColor: Cesium.Color.WHITE.withAlpha(0.0),

            startScale: viewModel.startScale,
            endScale: viewModel.endScale,

            minimumParticleLife: viewModel.minimumParticleLife,
            maximumParticleLife: viewModel.maximumParticleLife,

            minimumSpeed: viewModel.minimumSpeed,
            maximumSpeed: viewModel.maximumSpeed,

            imageSize: new Cesium.Cartesian2(
              viewModel.particleSize,
              viewModel.particleSize
            ),

            emissionRate: viewModel.emissionRate,

            bursts: [
              // these burst will occasionally sync to create a multicolored effect
              new Cesium.ParticleBurst({
                time: 5.0,
                minimum: 10,
                maximum: 100,
              }),
              new Cesium.ParticleBurst({
                time: 10.0,
                minimum: 50,
                maximum: 100,
              }),
              new Cesium.ParticleBurst({
                time: 15.0,
                minimum: 200,
                maximum: 300,
              }),
            ],

            lifetime: 16.0,

            emitter: new Cesium.CircleEmitter(2.0),

            emitterModelMatrix: computeEmitterModelMatrix(),

            updateCallback: applyGravity,
          })
        );

        var gravityScratch = new Cesium.Cartesian3();

        function applyGravity(p, dt) {
          // We need to compute a local up vector for each particle in geocentric space.
          var position = p.position;

          Cesium.Cartesian3.normalize(position, gravityScratch);
          Cesium.Cartesian3.multiplyByScalar(
            gravityScratch,
            viewModel.gravity * dt,
            gravityScratch
          );

          p.velocity = Cesium.Cartesian3.add(
            p.velocity,
            gravityScratch,
            p.velocity
          );
        }

        viewer.scene.preUpdate.addEventListener(function (scene, time) {
          particleSystem.modelMatrix = computeModelMatrix(entity, time);

          // Account for any changes to the emitter model matrix.
          particleSystem.emitterModelMatrix = computeEmitterModelMatrix();

          // Spin the emitter if enabled.
          if (viewModel.spin) {
            viewModel.heading += 1.0;
            viewModel.pitch += 1.0;
            viewModel.roll += 1.0;
          }
        });

        Cesium.knockout
          .getObservable(viewModel, "emissionRate")
          .subscribe(function (newValue) {
            particleSystem.emissionRate = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "particleSize")
          .subscribe(function (newValue) {
            var particleSize = parseFloat(newValue);
            particleSystem.minimumImageSize.x = particleSize;
            particleSystem.minimumImageSize.y = particleSize;
            particleSystem.maximumImageSize.x = particleSize;
            particleSystem.maximumImageSize.y = particleSize;
          });

        Cesium.knockout
          .getObservable(viewModel, "minimumParticleLife")
          .subscribe(function (newValue) {
            particleSystem.minimumParticleLife = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "maximumParticleLife")
          .subscribe(function (newValue) {
            particleSystem.maximumParticleLife = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "minimumSpeed")
          .subscribe(function (newValue) {
            particleSystem.minimumSpeed = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "maximumSpeed")
          .subscribe(function (newValue) {
            particleSystem.maximumSpeed = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "startScale")
          .subscribe(function (newValue) {
            particleSystem.startScale = parseFloat(newValue);
          });

        Cesium.knockout
          .getObservable(viewModel, "endScale")
          .subscribe(function (newValue) {
            particleSystem.endScale = parseFloat(newValue);
          });

        var options = [
          {
            text: "Circle Emitter",
            onselect: function () {
              particleSystem.emitter = new Cesium.CircleEmitter(2.0);
            },
          },
          {
            text: "Sphere Emitter",
            onselect: function () {
              particleSystem.emitter = new Cesium.SphereEmitter(2.5);
            },
          },
          {
            text: "Cone Emitter",
            onselect: function () {
              particleSystem.emitter = new Cesium.ConeEmitter(
                Cesium.Math.toRadians(45.0)
              );
            },
          },
          {
            text: "Box Emitter",
            onselect: function () {
              particleSystem.emitter = new Cesium.BoxEmitter(
                new Cesium.Cartesian3(10.0, 10.0, 10.0)
              );
            },
          },
        ];

        Sandcastle.addToolbarMenu(options);
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>

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