XPPL/app/templates/home.html

{% extends "base.html" %}

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


<div class="compass">
  <div class="arrow"></div>
  <div class="compass-circle"><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 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> 
  </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="closest";

    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);
    
    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>'
    }).addTo(map);
    
    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 myPositionCircle = L.circle([48.172934, 9.01236], {
    //     color: 'red',
    //     stroke:false,
    //     fillColor: 'red',
    //     fillOpacity: 0.5,
    //     radius: 10
    // }).addTo(map);

    var myIcon = L.icon({
    iconUrl: '/static/img/me.png',
    iconSize: [50, 50],
    iconAnchor: [25, 25],
    popupAnchor: [-3, -76],
    });

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

    circleArray.push(myPositionCircle);

    
    var x = document.getElementById("position");
    
    let id;
    let target;
    let options;
    
    //first: latitude, second: longitude
    target = {
      latitude : 48.172934,
      longitude: 9.01236
    };
    
    var my_location = {
      latitude : 0,
      longitude: 0
    };
    
    function success(pos) {
      const crd = pos.coords;
      my_location.longitude = crd.longitude;
      my_location.latitude = crd.latitude;
    
      if(view == "closest") updateView()

      console.log("updated")
    
      x.innerHTML = "Latitude: " + crd.latitude +
      "<br>Longitude: " + crd.longitude +
      "<br>Distance to TENT: " + distance(target.longitude, target.latitude, crd.longitude, crd.latitude);
    
      // 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(){
      console.log("storing location");
      console.log(my_location)
      var xhr = new XMLHttpRequest();
      xhr.open("POST", "./addlocation", true);
      xhr.setRequestHeader('Content-Type', 'application/json');
      xhr.send(JSON.stringify({
          longitude: my_location.longitude,
          latitude: my_location.latitude
      }));
    
      xhr.onreadystatechange=function(){
           if (xhr.readyState==4 && xhr.status==200){
                 location.reload();
           }
        }      
    }

    function store_location_mosquito(){
      console.log("storing location");
      console.log(my_location)
      var xhr = new XMLHttpRequest();
      xhr.open("POST", "./addlocationmosquito", true);
      xhr.setRequestHeader('Content-Type', 'application/json');
      xhr.send(JSON.stringify({
          longitude: my_location.longitude,
          latitude: my_location.latitude
      }));
    
      xhr.onreadystatechange=function(){
           if (xhr.readyState==4 && xhr.status==200){
                 location.reload();
           }
        }      
    }


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

    function add_audio(){
        window.location.href = "addaudio?longitude="+ my_location.longitude +"&latitude="+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());
        // L.polyline([closest.layer.getLatLng(), myPositionCircle.getLatLng()], {
        //   color: 'black',
        //   weight: 1,
        // }).addTo(map)
        document.getElementById("distance_close").innerHTML = "closest mosquito: " + distance(closest.layer.getLatLng().lat,closest.layer.getLatLng().lng,myPositionCircle.getLatLng().lat, myPositionCircle.getLatLng().lng)
        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(".compass-circle");
    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") {
              alert("granted")
              window.addEventListener("deviceorientation", handler, true);
            } else {
              alert("has to be allowed!");
            }
          })
          .catch(() => alert("not supported"));
      }
    }

    function handler(e) {
      compass = e.webkitCompassHeading || Math.abs(e.alpha - 360);
      compassCircle.style.transform = `translate(-50%, -50%) rotate(${-compass}deg)`;

      // ±15 degree

      // if (
      //   (pointDegree < Math.abs(compass) &&
      //     pointDegree + 15 > Math.abs(compass)) ||
      //   pointDegree > Math.abs(compass + 15) ||
      //   pointDegree < Math.abs(compass)
      // ) {
      //   myPoint.style.opacity = 0;
      // } else if (pointDegree) {
      //   myPoint.style.opacity = 1;
      // }
    }

    

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

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

      // compassCircle.style.transform = `translate(-50%, -50%) rotate(${-compass}deg)`;

    }

    function calcDegreeToPoint(latitude, longitude) {
      // Qibla geolocation
      var closest = L.GeometryUtil.closestLayer(map, mosquitoArray, myPositionCircle.getLatLng());
      console.log(closest);

      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();
    startCompass();
    
    
    </script>

{% endblock js %}