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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="Construct new data points within the range of a discrete set of known data points."
    />
    <meta name="cesium-sandcastle-labels" content="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);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar">
      <div id="interpolationMenu"></div>
    </div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        var viewer = new Cesium.Viewer("cesiumContainer", {
          infoBox: false, //Disable InfoBox widget
          selectionIndicator: false, //Disable selection indicator
          shouldAnimate: true, // Enable animations
          terrainProvider: Cesium.createWorldTerrain(),
        });

        //Enable lighting based on the sun position
        viewer.scene.globe.enableLighting = true;

        //Enable depth testing so things behind the terrain disappear.
        viewer.scene.globe.depthTestAgainstTerrain = true;

        //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,
          360,
          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 = 10;

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

        //Generate a random circular pattern with varying heights.
        function computeCirclularFlight(lon, lat, radius) {
          var property = new Cesium.SampledPositionProperty();
          for (var i = 0; i <= 360; i += 45) {
            var radians = Cesium.Math.toRadians(i);
            var time = Cesium.JulianDate.addSeconds(
              start,
              i,
              new Cesium.JulianDate()
            );
            var position = Cesium.Cartesian3.fromDegrees(
              lon + radius * 1.5 * Math.cos(radians),
              lat + radius * Math.sin(radians),
              Cesium.Math.nextRandomNumber() * 500 + 1750
            );
            property.addSample(time, position);

            //Also create a point for each sample we generate.
            viewer.entities.add({
              position: position,
              point: {
                pixelSize: 8,
                color: Cesium.Color.TRANSPARENT,
                outlineColor: Cesium.Color.YELLOW,
                outlineWidth: 3,
              },
            });
          }
          return property;
        }

        //Compute the entity position property.
        var position = computeCirclularFlight(-112.110693, 36.0994841, 0.03);

        //Actually create the entity
        var entity = viewer.entities.add({
          //Set the entity availability to the same interval as the simulation time.
          availability: new Cesium.TimeIntervalCollection([
            new Cesium.TimeInterval({
              start: start,
              stop: stop,
            }),
          ]),

          //Use our computed positions
          position: position,

          //Automatically compute orientation based on position movement.
          orientation: new Cesium.VelocityOrientationProperty(position),

          //Load the Cesium plane model to represent the entity
          model: {
            uri: "../../SampleData/models/CesiumAir/Cesium_Air.glb",
            minimumPixelSize: 64,
          },

          //Show the path as a pink line sampled in 1 second increments.
          path: {
            resolution: 1,
            material: new Cesium.PolylineGlowMaterialProperty({
              glowPower: 0.1,
              color: Cesium.Color.YELLOW,
            }),
            width: 10,
          },
        });

        //Add button to view the path from the top down
        Sandcastle.addDefaultToolbarButton("View Top Down", function () {
          viewer.trackedEntity = undefined;
          viewer.zoomTo(
            viewer.entities,
            new Cesium.HeadingPitchRange(0, Cesium.Math.toRadians(-90))
          );
        });

        //Add button to view the path from the side
        Sandcastle.addToolbarButton("View Side", function () {
          viewer.trackedEntity = undefined;
          viewer.zoomTo(
            viewer.entities,
            new Cesium.HeadingPitchRange(
              Cesium.Math.toRadians(-90),
              Cesium.Math.toRadians(-15),
              7500
            )
          );
        });

        //Add button to track the entity as it moves
        Sandcastle.addToolbarButton("View Aircraft", function () {
          viewer.trackedEntity = entity;
        });

        //Add a combo box for selecting each interpolation mode.
        Sandcastle.addToolbarMenu(
          [
            {
              text: "Interpolation: Linear Approximation",
              onselect: function () {
                entity.position.setInterpolationOptions({
                  interpolationDegree: 1,
                  interpolationAlgorithm: Cesium.LinearApproximation,
                });
              },
            },
            {
              text: "Interpolation: Lagrange Polynomial Approximation",
              onselect: function () {
                entity.position.setInterpolationOptions({
                  interpolationDegree: 5,
                  interpolationAlgorithm:
                    Cesium.LagrangePolynomialApproximation,
                });
              },
            },
            {
              text: "Interpolation: Hermite Polynomial Approximation",
              onselect: function () {
                entity.position.setInterpolationOptions({
                  interpolationDegree: 2,
                  interpolationAlgorithm: Cesium.HermitePolynomialApproximation,
                });
              },
            },
          ],
          "interpolationMenu"
        );
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>

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