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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="Demonstration of imagery layers with rectangular cutouts."
    />
    <meta name="cesium-sandcastle-labels" content="Tutorials" />
    <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">
      <table class="infoPanel">
        <tbody>
          <tr>
            <td>Click on the Cesium display to start.</td>
          </tr>
          <tr>
            <td>w/s - move cutout north/south</td>
          </tr>
          <tr>
            <td>a/d - move cutout west/east</td>
          </tr>
        </tbody>
      </table>
    </div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        var viewer = new Cesium.Viewer("cesiumContainer", {
          imageryProvider: new Cesium.TileMapServiceImageryProvider({
            url: Cesium.buildModuleUrl("Assets/Textures/NaturalEarthII"),
          }),
          baseLayerPicker: false,
        });

        var canvas = viewer.canvas;
        canvas.setAttribute("tabindex", "0"); // needed to put focus on the canvas
        canvas.onclick = function () {
          canvas.focus();
        };

        var scene = viewer.scene;

        var defaultImageryLayerCutout = Cesium.Rectangle.fromDegrees(
          -90,
          20,
          -70,
          40
        );

        // Cut a rectangle out of the base layer
        var layers = viewer.imageryLayers;
        var imageryBaseLayer = layers.get(0);

        imageryBaseLayer.cutoutRectangle = defaultImageryLayerCutout;

        // Fit a SingleTileImageryProvider inside the cutout on the lowest layer
        layers.addImageryProvider(
          new Cesium.SingleTileImageryProvider({
            url: "../images/Cesium_Logo_overlay.png",
            rectangle: defaultImageryLayerCutout,
          })
        );

        // Add an Earth at Night layer and a "traveling" cutout
        var earthAtNight = layers.addImageryProvider(
          new Cesium.IonImageryProvider({ assetId: 3812 })
        );
        earthAtNight.cutoutRectangle = Cesium.Rectangle.fromDegrees(
          -100,
          10,
          -60,
          50
        );
        earthAtNight.alpha = 0.9;

        // "traveling" code
        var flags = {
          moveEast: false,
          moveWest: false,
          moveNorth: false,
          moveSouth: false,
        };

        function getFlagForKeyCode(keyCode) {
          switch (keyCode) {
            case "W".charCodeAt(0):
              return "moveNorth";
            case "S".charCodeAt(0):
              return "moveSouth";
            case "D".charCodeAt(0):
              return "moveEast";
            case "A".charCodeAt(0):
              return "moveWest";
            default:
              return undefined;
          }
        }

        document.addEventListener(
          "keydown",
          function (e) {
            var flagName = getFlagForKeyCode(e.keyCode);
            if (typeof flagName !== "undefined") {
              flags[flagName] = true;
            }
          },
          false
        );

        document.addEventListener(
          "keyup",
          function (e) {
            var flagName = getFlagForKeyCode(e.keyCode);
            if (typeof flagName !== "undefined") {
              flags[flagName] = false;
            }
          },
          false
        );

        var moveIncrement = 0.05;
        viewer.clock.onTick.addEventListener(function (clock) {
          var travelingRectangle = earthAtNight.cutoutRectangle;
          if (
            flags.moveNorth &&
            travelingRectangle.north + moveIncrement < Cesium.Math.PI_OVER_TWO
          ) {
            travelingRectangle.north += moveIncrement;
            travelingRectangle.south += moveIncrement;
          }
          if (
            flags.moveSouth &&
            travelingRectangle.south - moveIncrement > -Cesium.Math.PI_OVER_TWO
          ) {
            travelingRectangle.north -= moveIncrement;
            travelingRectangle.south -= moveIncrement;
          }
          if (flags.moveEast) {
            travelingRectangle.east += moveIncrement;
            travelingRectangle.west += moveIncrement;
          }
          if (flags.moveWest) {
            travelingRectangle.east -= moveIncrement;
            travelingRectangle.west -= moveIncrement;
          }
          travelingRectangle.east = wrapLongitude(travelingRectangle.east);
          travelingRectangle.west = wrapLongitude(travelingRectangle.west);
        });

        function wrapLongitude(value) {
          if (value < -Cesium.Math.PI) {
            return value + Cesium.Math.TWO_PI;
          }
          if (value > Cesium.Math.PI) {
            return value - Cesium.Math.TWO_PI;
          }
          return value;
        }

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

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