polylines_with_particles.js

$(function () {
  Cesium.Ion.defaultAccessToken =
    "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI5ODI4ZTYyZS1mMTg2LTQ5NGEtYjdiOS02ODg2NzVhNjc0MTAiLCJpZCI6MjkwNCwiaWF0IjoxNTM1MTA5OTAzfQ.kyDX_0ScvJBkYnvXI0DW5NfZbiaRL5ezwtAUhxYnk1Y";
  var imageryViewModels = [];
  imageryViewModels.push(
    new Cesium.ProviderViewModel({
      name: "Sentinel-2",
      iconUrl: Cesium.buildModuleUrl(
        "Widgets/Images/ImageryProviders/sentinel-2.png"
      ),
      tooltip: "Sentinel-2 cloudless.",
      creationFunction: function () {
        return new Cesium.IonImageryProvider({ assetId: 3954 });
      },
    })
  );

  imageryViewModels.push(
    new Cesium.ProviderViewModel({
      name: "Blue Marble",
      iconUrl: Cesium.buildModuleUrl(
        "Widgets/Images/ImageryProviders/blueMarble.png"
      ),
      tooltip: "Blue Marble Next Generation July, 2004 imagery from NASA.",
      creationFunction: function () {
        return new Cesium.IonImageryProvider({ assetId: 3845 });
      },
    })
  );

  var viewer = new Cesium.Viewer("cesiumContainer", {
    imageryProvider: new Cesium.IonImageryProvider({ assetId: 3954 }),

    terrainProvider: new Cesium.CesiumTerrainProvider({
      url: Cesium.IonResource.fromAssetId(1),
    }),
    scene3DOnly: false,
    shouldAnimate: true,
    animation: true,
    infoBox: true,
    baseLayerPicker: true,
    fullscreenButton: false,
    timeline: false,
    navigationHelpButton: true,
    navigationInstructionsInitiallyVisible: false,
    homeButton: false,
    selectionIndicator: true,
    geocoder: true,
    // imageryProviderViewModels: imageryViewModels
  });

  // var layer = viewer.imageryLayers.addImageryProvider(
  // 	new Cesium.IonImageryProvider({ assetId: 3 })
  // );

  var imageryLayer = viewer.imageryLayers.addImageryProvider(
    new Cesium.IonImageryProvider({ assetId: 3954 })
  );

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

  var tileset = viewer.scene.primitives.add(
    new Cesium.Cesium3DTileset({
      url: "buildingTiles/StoeckachLOD1/tileset.json",
      show: true,
    })
  );

  tileset.readyPromise.then(function (tileset) {
    return zoomAll(tileset);
  });

  tileset.readyPromise.then(function (tileset) {
    var R = 0; // roll
    var P = 0; // pitch
    var Yaw = 0; // yaw
    var height = 53;
    var cartographic = Cesium.Cartographic.fromCartesian(
      tileset.boundingSphere.center
    );
    var surface = Cesium.Cartesian3.fromRadians(
      cartographic.longitude,
      cartographic.latitude,
      0.0
    );
    var offset = Cesium.Cartesian3.fromRadians(
      cartographic.longitude,
      cartographic.latitude,
      height
    );
    var translation = Cesium.Cartesian3.subtract(
      offset,
      surface,
      new Cesium.Cartesian3()
    );

    //var rotMat = new Cesium.Matrix3();
    var rotation = new Cesium.Matrix3.fromHeadingPitchRoll(
      new Cesium.HeadingPitchRoll(Yaw, P, R)
    );

    tileset.modelMatrix = Cesium.Matrix4.fromRotationTranslation(
      rotation,
      translation
    );

    return zoomAll(tileset);
  });

  viewer.scene.globe.enableLighting = true; // set lighting to true

  var zoomAll = function (tileset) {
    return new Promise(function (resolve, reject) {
      if (!tileset) {
        reject("Tileset is undifined");
      }
      viewer.camera.viewBoundingSphere(
        tileset.boundingSphere,
        new Cesium.HeadingPitchRange(0, -0.5, 1500)
      );
      viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
      resolve();
    });
  };

  //////////////////////////////////////////
  // load streamline data from text file and parse it to polyline with multiple colors.

  var pos = [];
  var cols = [];
  var streamID = [];
  var Velocity = [];
  var pt_to_pt_dist = [];
  var avgVelocity = [];
  var czmlArray = [];

  function get_date_time_dt(deltaTime) {
    // deltaTime should be given in SECONDS and is then converted to milliseconds
    // set deltaTime to 0 if you want to get current date and time
    // set to +60000 to get date and time of 60 seconds = 60000 milliseconds in the future

    return (currentdate = new Date(
      new Date().getTime() + deltaTime * 1000
    ).toISOString());
  }

  var divisor = 15
  d3.dsv(",", "results/polylines_with_velocity.csv").then(function (text) {
    const particleDuration = 170; // units in seconds the particle / point should take to move from start to finish
    //define the czml structure
    var particle_czml = [
      {
        id: "document",
        name: "CZML Point - Time Dynamic",
        version: "1.0",
        clock: {
          interval: get_date_time_dt(0) + "/" + get_date_time_dt(particleDuration),         // This is the time range of our simulation
          currentTime: '',    // This is the time associated with the start view
          currentTime: get_date_time_dt(0),
          multiplier: 5,
          // range: 'LOOP_STOP',
        }
      },
      {
        id: "point",
        availability:
          get_date_time_dt(0) + "/" + get_date_time_dt(particleDuration),
        position: {
          epoch: get_date_time_dt(0),
          cartographicDegrees: [
            // use 4 coordinates / values : (t,x,y,z) or rather (t,lon,lat,alt)
          ],
          "interpolationAlgorithm": "LINEAR",
          "interpolationDegree": 5
        },
        point: {
          color: {
            rgba: [0, 0, 0, 250],
          },
          outlineColor: {
            rgba: [255, 0, 0, 128],
          },
          outlineWidth: 1,
          pixelSize: 6,
        },
      },
    ];

    //////////////////////////////////////////////////////////////////////
    //////////////////////////////////////////////////////////////////////
    let package_time_faktor = 2.0;

    // create an array of deep copies of the original czml data structure, to be modified below.
    let czmlArr = [];
    for (c=0; c < package_time_faktor; c++){
      czmlArr.push(JSON.parse(JSON.stringify(particle_czml)));    
      czmlArr[c][1].id = "point_arr_" + String(c);  
    }

    var temp = text;
    for (var i = 0; i < temp.length; i++) {
      // use i+=7 when parsed as d3.text(...)
      pos.push([
        parseFloat(text[i].Lon),
        parseFloat(text[i].Lat),
        parseFloat(text[i].z),
      ]);
      cols.push([
        parseInt(text[i].R),
        parseInt(text[i].G),
        parseInt(text[i].B),
      ]);
      streamID.push(parseInt(text[i].ID));
      Velocity.push(parseFloat(text[i].velocity));
      avgVelocity.push(parseFloat(text[i].AverageVelocity));
      pt_to_pt_dist.push(parseFloat(text[i].pt_to_pt_dist));
      // use these lines if parsed as text. i.e. using d3.text(...)
      //pos.push([parseFloat(temp[i+0]), parseFloat(temp[i+1]), parseFloat(temp[i+2])]);
      //colors.push([parseFloat(temp[i+3]),parseFloat(temp[i+4]),parseFloat(temp[i+5])])
      //streamID.push([parseFloat(temp[i+6])]);
    }

    const maxID = streamID.reduce(function (a, b) {
      return Math.max(a, b);
    });

    //find out the unique ids within the streamID array
    const uniqueStreamID = Array.from(new Set(streamID)); // const uniqueStreamID = [...new Set(streamID)]; // same can be done with spread operator

    //get index of each unique id, first element of those
    let sIDidx = [];
    for (var i = 0; i <= maxID; i++) {
      var tmpIdx = streamID.indexOf(i);
      if (tmpIdx !== -1) sIDidx.push(tmpIdx);
    }

    /////////////////////////////////////////////////
    // Create and draw a polyline with per vertex colors
    /////////////////////////////////////////////////
    const heightOffset = 120;
    for (var line = 0; line < uniqueStreamID.length; line++) {
      let positions = [];
      let positionsInDegrees = [];
      let colors = [];
      let individual_particle_velo = [];
      let individual_particle_pt_distance = [];
      let individual_particle_avg_velo = [];

      for (i = sIDidx[line - 1]; i < sIDidx[line] - 1; ++i) {
        positions.push(
          Cesium.Cartesian3.fromDegrees(
            pos[i][0],
            pos[i][1],
            pos[i][2] + heightOffset
          )
        );
        positionsInDegrees.push([
          pos[i][0],
          pos[i][1],
          pos[i][2] + heightOffset,
        ]);
        colors.push(
          Cesium.Color.fromBytes(cols[i][0], cols[i][1], cols[i][2], 180)
        );
        individual_particle_avg_velo.push(avgVelocity[i]);
        individual_particle_pt_distance.push(pt_to_pt_dist[i]);
        individual_particle_velo.push(Velocity[i]);
      }
      // For per segment coloring, supply the colors option with
      // an array of colors for each vertex.  Also set the
      // colorsPerVertex option to true.
      viewer.scene.primitives.add(
        new Cesium.Primitive({
          geometryInstances: new Cesium.GeometryInstance({
            geometry: new Cesium.PolylineGeometry({
              positions: positions,
              width: 5.0,
              vertexFormat: Cesium.PolylineColorAppearance.VERTEX_FORMAT,
              colors: colors,
              colorsPerVertex: true,
            }),
          }),
          appearance: new Cesium.PolylineColorAppearance(),
        })
      );

      ////////////////////////////////////////////////
      // Create and prepare particles for movement
      /////////////////////////////////////////////////
      let streamDist = individual_particle_pt_distance.reduce(function (a, b) {
        return a + b;
	  }, 0);
	//   console.log(streamDist);

      let t = 0;
      let dt = (individual_particle_pt_distance[1] / individual_particle_avg_velo[0])/ divisor;
      // let dt = streamDist / individual_particle_avg_velo[0] / divisor;
      let temp_pos = [];

      for (i = 0; i < positionsInDegrees.length; i++) {
        if (i === 0) {
          temp_pos.push(
            0,
            positionsInDegrees[i][0],
            positionsInDegrees[i][1],
            positionsInDegrees[i][2]
          );
        } else {
          temp_pos.push(
            t,
            positionsInDegrees[i][0],
            positionsInDegrees[i][1],
            positionsInDegrees[i][2]
          );
          dt = individual_particle_pt_distance[i] /individual_particle_avg_velo[0] / divisor;
          // console.log(individual_particle_pt_distance[i] + "/" + individual_particle_avg_velo[i] );
          // console.log(dt);
        }

        t += dt;
      }
      particle_czml[1].id = "point" + String(line);
	  particle_czml[1].position.cartographicDegrees = temp_pos; 
	  
	//   czmlArray.push(particle_czml);
      viewer.dataSources.add(Cesium.CzmlDataSource.load(particle_czml));
        ////////////////////////////////////////////////      
        dt = (individual_particle_pt_distance[1] / individual_particle_avg_velo[0]) / divisor;
        for (c=0; c < czmlArr.length ; c++){

          temp_pos = [];
          for (i = 0; i < positionsInDegrees.length; i++) {
            if (i === 0) {
              temp_pos.push(
                t,
                positionsInDegrees[i][0],
                positionsInDegrees[i][1],
                positionsInDegrees[i][2]
              );          
            } else {
              temp_pos.push(
                t,
                positionsInDegrees[i][0],
                positionsInDegrees[i][1],
                positionsInDegrees[i][2]
              );          
              dt = individual_particle_pt_distance[i] /individual_particle_avg_velo[0] / divisor;
              // console.log(individual_particle_pt_distance[i] + "/" + individual_particle_avg_velo[i] );
              // console.log(dt);
            }

            t += dt;
          }
          czmlArr[c][1].position.cartographicDegrees = temp_pos;       
          czmlArr[c][1].id = "point_set_" + String(c) + "_" + String(line);  
          czmlArr[c][1].position.epoch = get_date_time_dt(0);
          viewer.dataSources.add(Cesium.CzmlDataSource.load(czmlArr[c])); 
        }
     
      
	  }   // end bracket for:  for (var line = 0; line < uniqueStreamID.length; line++) {
	

  });

  

  // This adds a large arrow to the viewer. Works fine. for testing

  // var purpleArrow = viewer.entities.add({
  // 	name: "Purple straight arrow at height",
  // 	polyline: {
  // 	  positions: Cesium.Cartesian3.fromDegreesArrayHeights([
  // 		9.187290, 48.784567, 400,
  // 		9.195991, 48.790575, 400
  // 	  ]),
  // 	  width: 50,
  // 	  arcType: Cesium.ArcType.NONE,
  // 	  material: new Cesium.PolylineArrowMaterialProperty(
  // 		Cesium.Color.PURPLE
  // 	  ),
  // 	},
  //   });

  // var f = new File([""], "results/singlePolyline.csv", {type: "text/plain", lastModified: Date()})

  // var temp = text.split(',');
  //   for(var i = 0; i < temp.length; i+=6) {
  //     pos.push([parseFloat(temp[i+1]), parseFloat(temp[i+2]), parseFloat(temp[i+3])]);
  //     colors.push([parseInt(temp[i+4]),parseInt(temp[i+5]),parseInt(temp[i+6])])
  //   }

  console.log("Position data imported.");

  

  // HTML overlay for showing feature name on mouseover
  var nameOverlay = document.createElement("div");
  viewer.container.appendChild(nameOverlay);
  nameOverlay.className = "backdrop";
  nameOverlay.style.display = "none";
  nameOverlay.style.position = "absolute";
  nameOverlay.style.bottom = "0";
  nameOverlay.style.left = "0";
  nameOverlay.style["pointer-events"] = "none";
  nameOverlay.style.padding = "4px";
  nameOverlay.style.backgroundColor = "green";

  var scene = viewer.scene;
  var longitude;
  var latitude;
  var fid;
  var featuretype;
  var gmlid;
  var selID = new Array();
  var cnt = 0;
  var lastPickedObject;

  var viewModel = {
    rightClickAction: "properties",
    middleClickAction: "hide",
  };

  Cesium.knockout.track(viewModel);

  var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);

  handler.setInputAction(function (movement) {
    // makes camera go to a certain position given by the coordinates below

    var feature = viewer.scene.pick(movement.position);
    if (!Cesium.defined(feature)) {
      console.log("no feature defined");
      return;
    }
    var propertyNames = feature.getPropertyNames();
    var lat = feature.getProperty("Latitude");
    var lon = feature.getProperty("Longitude");
    var tmp = feature.getProperty("YearOfConstruction");

    viewer.camera.flyTo({
      destination: Cesium.Cartesian3.fromDegrees(lon, lat, 900),
      maximumHeight: 1500.0,
      orientation: {
        heading: Cesium.Math.toRadians(0.0),
        pitch: Cesium.Math.toRadians(-90.0),
        roll: Cesium.Math.toRadians(45.0),
      },
      duration: 2,
    });
  }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

  handler.setInputAction(function (movement) {
    var feature = viewer.scene.pick(movement.position);
    if (!Cesium.defined(feature)) {
      return;
    }
    var action = viewModel.rightClickAction;
    action === "properties";
    printProperties(movement, feature);
  }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);

  function printProperties(movement, feature) {
    console.log("Properties:");
    var propertyNames = feature.getPropertyNames();
    var length = propertyNames.length;
    for (var i = 0; i < length; ++i) {
      var propertyName = propertyNames[i];
      if (
        propertyName == "gmlIdALKISLageBezeichnung_1" ||
        propertyName == "gmlIdALKISLageBezeichnung_2" ||
        propertyName == "gmlIdALKISLageBezeichnung_3" ||
        propertyName == "gmlIdALKISLageBezeichnung_4" ||
        propertyName == "gmlIdALKISLageBezeichnung_5" ||
        propertyName == "gmlIdALKISLageBezeichnung_6"
      )
        console.log("  " + propertyName + ": " + "zensiert");
      else
        console.log(
          "  " + propertyName + ": " + feature.getProperty(propertyName)
        );
    }

    // Evaluate feature description
    //console.log('Description : ' + tileset.style.meta.description.evaluate(scene.frameState, feature));
  }

  handler.setInputAction(function (movement) {
    var feature = viewer.scene.pick(movement.position);
    if (!Cesium.defined(feature)) {
      return;
    }

    var action = viewModel.middleClickAction;
    if (action === "hide") {
      feature.show = false;
    } else {
      feature.show = true;
    }
  }, Cesium.ScreenSpaceEventType.MIDDLE_CLICK);

  function showLegend() {
    $("#legend").css("display", "block");
  }
  function hideLegend() {
    $("#legend").css("display", "none");
  }

  // Legend - Colour Table
  function emptyColourTable() {
    $(".inner").empty();
  }

  function setHeightTable() {
    $(".inner").append(
      "<table>" +
        "<tr><td class='outlined' bgcolor='red'>&nbsp;&nbsp;&nbsp;&nbsp;</td><td> > 3.5 </td></tr>" +
        "<tr><td class='outlined' bgcolor='#ff6b21'></td><td> 3 </td></tr>" +
        "<tr><td class='outlined' bgcolor='#ffb400'></td><td> 2.5 </td></tr>" +
        "<tr><td class='outlined' bgcolor='yellow'></td><td> 2</td></tr>" +
        "<tr><td class='outlined' bgcolor='#89FF8F'></td><td> 1.5 </td></tr>" +
        "<tr><td class='outlined' bgcolor='cyan'></td><td> 1 </td></tr>" +
        "<tr><td class='outlined' bgcolor='blue'></td><td> 0.5 </td></tr>" +
        "</table>"
    );
  }

  return Cesium.when(tileset.readyPromise).then(function (tileset) {
    tileset.style = new Cesium.Cesium3DTileStyle({
      color: "color('white',1)",
    });
    showLegend();
    setHeightTable();
  });
});