XPPL/app/templates/home.html

{% extends "base.html" %}

{% block main %}
<div id="home_content">
  <p id="position"></p>


  <div class="compass">
    <div id="arrow" class="arrow"><svg viewBox="0 0 25 25" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd"
        clip-rule="evenodd">
        <path class="st0" d="M13,2.6l6.2,7.5L20,9.5l-7.5-9L5,9.5l0.8,0.6L12,2.6v21.9h1C13,24.5,13,2.6,13,2.6z" /></svg>
    </div>
    <div id="goal" class="compass-goal"><svg id="Layer_2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 21.94 21.94">
        <defs>
          <style>
            .cls-1 {
              fill: #3fb800;
              opacity: .3;
            }
          </style>
        </defs>
        <g id="Layer_1-2">
          <circle class="cls-1" cx="10.97" cy="10.97" r="10.97" />
        </g>
      </svg></div>
    <div class="my-point"></div>
  </div>



  <!-- <h1 class="header" id="title">GEO</h1> -->
  <div id="button_group">
    <div id="distance_close">(distance to mosquito)</div>
    <button id="store_location" onclick="store_location()"><img src="/static/img/hangout.png" alt="">add
      hangout</button>
    <button id="store_location_mosquito" onclick="store_location_mosquito()"><img src="/static/img/mosquito.png"
        alt="">add mosquito</button>
    <button id="add_text" onclick="add_text()"><img src="/static/img/text.png" alt="">add message</button>
    <button id="add_audio" onclick="add_audio()"><img src="/static/img/audio.png" alt=""> add audio</button>

    <select id="viewSelector" onchange="changeViewSelect()">
      <option>Choose view</option>
      <option value="all">show all entries</option>
      <option value="closest">show closest mosquito</option>
      <option value="me">my position</option>
    </select>

    <button class="start-btn">compass</button>
    <button id="map_view" onclick="toggle_map()">map</button>
  </div>
</div>

<!-- HEADING DIRECTION https://stackoverflow.com/questions/46033649/heading-javascript-geolocation -->
<!-- COMPASS CROSS DEVICE https://stackoverflow.com/questions/16048514/can-i-use-javascript-to-get-the-compass-heading-for-ios-and-android-->


<div class="locations_popup">
  {% for location in locations %}
  <div class="row" id={{location.id}}>
    <div onclick="closeLocation()" class="close">×</div>
    <div>{{location.longitude}}, {{location.latitude}}</div>
    <div>{{location.message if location.loc_type == "message"}}</div>
    <div>
      {% if location.loc_type == "audio" %}
      <audio id="audio-player" controls="" src="uploads/{{location.audio}}"></audio>
      {% endif %}
    </div>
  </div>
  {% endfor %}
</div>

{% endblock main %}
{% block js %}

<script>
  var locations;
  var zoom_level = 18;
  var markerArray = [];
  var circleArray = [];
  var mosquitoArray = [];
  var view = "me";
  var workingCompass = false;
  var map_view = false;

  function assign_data(data) {
    locations = data;
  }
  assign_data({{data_locations | tojson}});

  var map = L.map('map', {
    attributionControl: false,
    zoomControl: false,
    zoom: 2000,
    zoomSnap: 0.5,
    animate: true,
    maxZoom: 19,
    //dragging: false,
    //scrollWheelZoom: false,
  }).setView([48.505, 1.09], zoom_level);

  var backgroundLayer = L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
    maxZoom: 19,
    zoom: 2,
    attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
  })

  function toggle_map() {
    if (map_view) {
      map.removeLayer(backgroundLayer)
    } else {
      map.addLayer(backgroundLayer)
    }
    map_view = !map_view
  }

  var myIcon = L.icon({
    iconUrl: '/static/img/me.png',
    iconSize: [30, 30],
    iconAnchor: [15, 15],
    popupAnchor: [-3, -76],
  });

  var myPositionCircle = L.marker([50.505, 30.57], {
    icon: myIcon
  }).addTo(map);

  circleArray.push(myPositionCircle);

  locations.forEach(function (item, index) {
    try {
      var icon;
      if (item.loc_type == "message") {
        icon = L.icon({
          iconUrl: '/static/img/text.png',
          iconSize: [50, 50],
          iconAnchor: [25, 25],
          popupAnchor: [-3, -76],
        });
      } else if (item.loc_type == "audio") {
        icon = L.icon({
          iconUrl: '/static/img/audio.png',
          iconSize: [50, 50],
          iconAnchor: [25, 25],
          popupAnchor: [-3, -76],
        });
      } else if (item.loc_type == "mosquito") {
        icon = L.icon({
          iconUrl: '/static/img/mosquito.png',
          iconSize: [50, 50],
          iconAnchor: [25, 25],
          popupAnchor: [-3, -76],
        });
      } else if (item.loc_type == "hangout") {
        icon = L.icon({
          iconUrl: '/static/img/hangout.png',
          iconSize: [50, 50],
          iconAnchor: [25, 25],
          popupAnchor: [-3, -76],
        });
      }
      var circle = L.marker([item.latitude, item.longitude], {
        icon: icon
      }).addTo(map).on("click", e => circleClick(e));
      circle.id = item.id;
      circleArray.push(circle);

      markerArray.push(L.marker([item.latitude, item.longitude]));

      if (item.loc_type == "mosquito") mosquitoArray.push(L.marker([item.latitude, item.longitude]));

    } catch (error) {
      console.error(error);
    }
  });

  var x = document.getElementById("position");

  let id;
  let target;
  let options;

  //first: latitude, second: longitude 51.915528423609125, 4.477065873620031
  target = {
    latitude: 51.915528423609125,
    longitude: 4.477065873620031
  };

  var my_location = {
    latitude: 0,
    longitude: 0
  };

  function success(pos) {
    const crd = pos.coords;
    my_location.longitude = crd.longitude;
    my_location.latitude = crd.latitude;

    updateView()

    x.innerHTML = "Latitude: " + crd.latitude +
      "<br>Longitude: " + crd.longitude +
      "<br>Distance to TENT: " + distance(target.longitude, target.latitude, crd.longitude, crd.latitude);

    locationHandler(pos);

    // if we want to clear the watch
    // if (target.latitude === crd.latitude && target.longitude === crd.longitude) {
    //   console.log('Congratulations, you reached the target');
    //   navigator.geolocation.clearWatch(id);
    // }
  }

  function error(err) {
    console.error(`ERROR(${err.code}): ${err.message}`);
    console.log("trying again")
    // id = navigator.geolocation.watchPosition(success, error, options);
  }

  options = {
    enableHighAccuracy: true,
    timeout: 1000,
    maximumAge: 1000
  };

  id = navigator.geolocation.watchPosition(success, error, options);

  function distance(lon1, lat1, lon2, lat2) {
    var R = 6371; // Radius of the earth in km
    var dLat = (lat2 - lat1).toRad(); // Javascript functions in radians
    var dLon = (lon2 - lon1).toRad();
    var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
      Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) *
      Math.sin(dLon / 2) * Math.sin(dLon / 2);
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    var d = R * c; // Distance in km
    var text;
    if (d < 1) {
      text = Math.round(d * 100) / 100 * 1000 + " m";
    } else {
      text = Math.round(d * 100) / 100 + " km"
    }
    return text;
  }

  /** Converts numeric degrees to radians */
  if (typeof (Number.prototype.toRad) === "undefined") {
    Number.prototype.toRad = function () {
      return this * Math.PI / 180;
    }
  }

  function store_location() {
    window.location.href = "addhangout/" + my_location.longitude + "/" + my_location.latitude + "/";

  }

  function store_location_mosquito() {
    window.location.href = "addmosquito/" + my_location.longitude + "/" + my_location.latitude + "/";
  }


  function add_text() {
    window.location.href = "addtext/" + my_location.longitude + "/" + my_location.latitude + "/";
  }

  function add_audio() {
    window.location.href = "addaudio/" + my_location.longitude + "/" + my_location.latitude + "/";
  }

  function updateView() {
    //update position on map
    // map.setView([my_location.latitude, my_location.longitude], zoom_level);
    myPositionCircle.setLatLng([my_location.latitude, my_location.longitude]);
    if (view == "all") {
      var group = new L.featureGroup(circleArray);
      map.fitBounds(group.getBounds().pad(0.4));
    } else if (view == "closest") {
      var closest = L.GeometryUtil.closestLayer(map, mosquitoArray, myPositionCircle.getLatLng());
      document.getElementById("distance_close").innerHTML = "closest mosquito: " + distance(closest.layer.getLatLng()
        .lng, closest.layer.getLatLng().lat, myPositionCircle.getLatLng().lng, myPositionCircle.getLatLng().lat)

      var group = new L.featureGroup([closest.layer, myPositionCircle]);
      map.fitBounds(group.getBounds().pad(0.4));
    } else if (view == "me") {
      map.setView([my_location.latitude, my_location.longitude], zoom_level);
    } else if (view == "free") {

    }
  }

  function changeViewSelect() {
    var mylist = document.getElementById("viewSelector");
    view = mylist.options[mylist.selectedIndex].value;
    updateView();
  }

  function circleClick(e) {
    var id = e.target.id
    var divsToHide = document.getElementsByClassName("row"); //divsToHide is an array
    for (var i = 0; i < divsToHide.length; i++) {
      divsToHide[i].style.display = "none"; // depending on what you're doing
    }
    document.getElementById(id).style.display = "block";
  }

  function closeLocation() {
    var divsToHide = document.getElementsByClassName("row"); //divsToHide is an array
    for (var i = 0; i < divsToHide.length; i++) {
      divsToHide[i].style.display = "none"; // depending on what you're doing
    }
  }

  window.addEventListener('resize', function (event) {
    updateView()
  }, true);

  // COMPASS
  const compassCircle = document.querySelector(".arrow");
  const myPoint = document.querySelector(".my-point");
  const startBtn = document.querySelector(".start-btn");
  var compass;
  var pointDegree;
  const isIOS =
    navigator.userAgent.match(/(iPod|iPhone|iPad)/) &&
    navigator.userAgent.match(/AppleWebKit/);

  function init() {
    startBtn.addEventListener("click", startCompass);
    // navigator.geolocation.getCurrentPosition(locationHandler);

    if (!isIOS) {
      window.addEventListener("deviceorientationabsolute", handler, true);
    }

  }

  function startCompass() {
    if (isIOS) {
      DeviceOrientationEvent.requestPermission()
        .then((response) => {
          if (response === "granted") {
            window.addEventListener("deviceorientation", handler, true);
          } else {
            alert("has to be allowed!");
          }
        })
        .catch(() => alert("not supported"));
    }
  }

  function handler(e) {
    workingCompass = true;
    if (workingCompass) {
      document.getElementById("arrow").style.display = "block";
    }
    compass = e.webkitCompassHeading || Math.abs(e.alpha - 360);
    compassCircle.style.transform = `translate(-50%, -50%) rotate(${pointDegree-compass}deg)`;

  }

  function locationHandler(position) {

    const {
      latitude,
      longitude
    } = position.coords;
    pointDegree = calcDegreeToPoint(latitude, longitude);

    if (pointDegree < 0) {
      pointDegree = pointDegree + 360;
    }
  }

  function calcDegreeToPoint(latitude, longitude) {
    // Qibla geolocation
    var closest = L.GeometryUtil.closestLayer(map, mosquitoArray, myPositionCircle.getLatLng());
    if (workingCompass == true) {
      if (parseFloat(distance(closest.layer.getLatLng().lat, closest.layer.getLatLng().lng, myPositionCircle.getLatLng()
          .lat, myPositionCircle.getLatLng().lng).split(" ")) < 20) {
        document.getElementById("arrow").style.display = "none";
        document.getElementById("goal").style.display = "block";
      } else {
        document.getElementById("arrow").style.display = "block";
        document.getElementById("goal").style.display = "none";
      }
    }

    const point = {
      lat: closest.layer.getLatLng().lat,
      lng: closest.layer.getLatLng().lng
    };

    const phiK = (point.lat * Math.PI) / 180.0;
    const lambdaK = (point.lng * Math.PI) / 180.0;
    const phi = (latitude * Math.PI) / 180.0;
    const lambda = (longitude * Math.PI) / 180.0;
    const psi =
      (180.0 / Math.PI) *
      Math.atan2(
        Math.sin(lambdaK - lambda),
        Math.cos(phi) * Math.tan(phiK) -
        Math.sin(phi) * Math.cos(lambdaK - lambda)
      );
    return Math.round(psi);
  }

  init();
  //
</script>

{% endblock js %}