Get user position and display nearby people on map (close #2)

package.json

@@ -12,6 +12,7 @@
   "dependencies": {
     "cordova-android": "^8.0.0",
     "cordova-plugin-app-version": "^0.1.9",
+    "cordova-plugin-geolocation": "^4.0.1",
     "cordova-plugin-headercolor": "^1.0.0",
     "cordova-plugin-inappbrowser": "^3.0.0",
     "cordova-plugin-statusbar": "^2.4.2",
@@ -27,7 +28,8 @@
       "cordova-plugin-inappbrowser": {},
       "phonegap-plugin-barcodescanner": {
         "ANDROID_SUPPORT_V4_VERSION": "27.+"
-      }
+      },
+      "cordova-plugin-geolocation": {}
     },
     "platforms": [
       "android"

www/js/api.js

@@ -4,6 +4,15 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+/**
+ * Get the API endpoint URL for an action
+ * @param {String} action
+ * @return {String}
+ */
+function getActionUrl(action) {
+    return SETTINGS["server"] + "/" + action;
+}
+
 /**
  * Call an API function on the server.
  * @param {string} action
@@ -16,19 +25,66 @@ function callAPI(action, data, success, failure) {
     return $.ajax({
         type: 'POST',
         dataType: 'json',
-        url: SETTINGS["server"] + "/" + action,
+        url: getActionUrl(action),
         data: data,
         timeout: 5000,
         success: function (data, textStatus) {
             if (data.status === "OK") {
                 success(data);
-            } else if (data.status === "ERROR") {
+                return;
+            }
+            if (typeof failure != 'function') {
+                return;
+            }
+            if (data.status === "ERROR") {
                 failure(data.msg);
             } else {
                 failure("The server sent an invalid response.");
             }
         },
         error: function (xhr, textStatus, errorThrown) {
+            if (typeof failure != 'function') {
+                return;
+            }
+            switch (textStatus) {
+                case "timeout":
+                    failure("Couldn't connect to the server (timeout).");
+                    break;
+                case "error":
+                    failure("Couldn't connect to the server (error).");
+                    break;
+                case "parseerror":
+                    failure("The server sent a malformed response.");
+                    break;
+                default:
+                    failure("Couldn't connect to the server.");
+            }
+        }
+    });
+}
+
+/**
+ * Call an API function on the server.  Makes fewer assumptions about what
+ * constitutes a success response.
+ * @param {string} action
+ * @param {array} data key: value array of arguments for the server.
+ * @param {function} success Called with the JSON response object.
+ * @param {function} failure Called with an error message string.
+ * @return {undefined}
+ */
+function callAPIRawResponse(action, data, success, failure) {
+    return $.ajax({
+        type: 'POST',
+        url: getActionUrl(action),
+        data: data,
+        timeout: 5000,
+        success: function (data, textStatus) {
+            success(data);
+        },
+        error: function (xhr, textStatus, errorThrown) {
+            if (typeof failure != 'function') {
+                return;
+            }
             switch (textStatus) {
                 case "timeout":
                     failure("Couldn't connect to the server (timeout).");

www/js/home.js

@@ -18,7 +18,7 @@ $(".view-main").on("card:open", ".card-expandable", function () {
 });
 
 $(".view-main").on("card:closed", "#map-card", function () {
-    leafletgllayer._glMap.setPitch(0);
+    //leafletgllayer._glMap.setPitch(0);
     leafletmap.invalidateSize();
 });
 
@@ -46,7 +46,7 @@ function loadBalance(callback) {
 }
 
 function openMapCard() {
-    leafletgllayer._glMap.setPitch(40);
+    //leafletgllayer._glMap.setPitch(40);
     leafletmap.invalidateSize();
 }
 

www/js/map.js

@@ -4,12 +4,20 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+var userPositionIsReal = false;
+var userposition = {
+    coords: {
+        latitude: 46.595,
+        longitude: -112.019,
+        accuracy: 10000
+    }
+};
 
 var leafletmap = L.map('map', {
     minZoom: 12,
     maxZoom: 20
 });
-leafletmap.setView([46.595, -112.019], 13);
+
 leafletmap.attributionControl.setPrefix("");
 var leafletgllayer = L.mapboxGL({
     attribution: "© OpenMapTiles © OpenStreetMap contributors",
@@ -18,4 +26,108 @@ var leafletgllayer = L.mapboxGL({
     pitch: 0
 });
 
-leafletgllayer.addTo(leafletmap);
+leafletgllayer.addTo(leafletmap);
+
+L.control.scale().addTo(leafletmap);
+
+var leafletpeoplelayer = L.geoJson(
+        {
+            name: "Nearby People",
+            type: "FeatureCollection",
+            features: [
+                {
+                    type: "Feature",
+                    geometry: {
+                        type: "Point",
+                        coordinates: [0, 0]
+                    },
+                    properties: {
+                        id: "",
+                        name: "",
+                        username: "",
+                        verified: false
+                    }
+                }
+            ]
+        },
+        {
+            onEachFeature: function (feature, layer) {
+                if (feature.properties && feature.properties.popupContent) {
+                    layer.bindPopup(feature.properties.popupContent);
+                }
+            },
+            pointToLayer: function (feature, latlng) {
+                return L.marker(latlng);
+//                return L.circleMarker(latlng, {
+//                    radius: 14,
+//                    fillColor: "#f00",
+//                    color: "#000",
+//                    weight: 1,
+//                    opacity: 1,
+//                    fillOpacity: 0.6
+//                });
+            }
+        }
+);
+
+function updateMap() {
+    var diagonalMeters = leafletmap.getBounds().getNorthWest().distanceTo(leafletmap.getBounds().getSouthEast());
+    var radius = (diagonalMeters / 2.0) / 1609.344;
+    callAPIRawResponse("getnearby", {
+        key: localStorage.getItem("key"),
+        latitude: leafletmap.getCenter().lat,
+        longitude: leafletmap.getCenter().lng,
+        radius: radius,
+        format: "geojson"
+    }, function (data) {
+        if (data.type == "FeatureCollection") {
+            leafletpeoplelayer.clearLayers();
+            data.features.forEach(function (item) {
+                item.properties.popupContent = "<i class=\"fas fa-user\"></i> " + item.properties.name + "<br><br><a class=\"button button-small button-fill text-color-white\" href=\"/sendmoney/" + item.properties.id + "\">Send Money</a>";
+                leafletpeoplelayer.addData(item);
+            });
+            leafletmap.addLayer(leafletpeoplelayer);
+        }
+    });
+}
+
+function recenterMapPosition() {
+    var zoom = 13;
+    if (userposition.coords.accuracy < 100) {
+        zoom = 15;
+    }
+    if (userposition.coords.accuracy < 50) {
+        zoom = 16;
+    }
+    leafletmap.setView([userposition.coords.latitude, userposition.coords.longitude], zoom);
+}
+
+function recenterMapToUserPosition() {
+    if (userPositionIsReal == false) {
+        getLocation(function (position) {
+            userposition = position;
+            userPositionIsReal = true;
+            recenterMapPosition();
+        });
+    } else {
+        recenterMapPosition();
+    }
+}
+
+// Attempt to get user location
+watchLocation(function (position) {
+    userposition = position;
+    if (userPositionIsReal == false) {
+        recenterMapPosition();
+        userPositionIsReal = true;
+    }
+});
+
+// Set map to default position
+recenterMapPosition();
+// Load nearby people
+updateMap();
+// Watch for map moving
+leafletmap.on("moveend", function () {
+    updateMap();
+});

www/js/platform.js

@@ -14,6 +14,38 @@ var openBrowser = function (url) {
 
 }
 
+var getLocation = function (success, error) {
+    if ("geolocation" in navigator) {
+        navigator.geolocation.getCurrentPosition(function (position) {
+            success(position);
+        }, function (err) {
+            error(err.message);
+        }, {
+            enableHighAccuracy: true,
+            timeout: 5000,
+            maximumAge: 0
+        });
+    } else {
+        error("Location is unavailable.");
+    }
+}
+
+var watchLocation = function (success, error) {
+    if ("geolocation" in navigator) {
+        navigator.geolocation.watchPosition(function (position) {
+            success(position);
+        }, function (err) {
+            error(err.message);
+        }, {
+            enableHighAccuracy: true,
+            timeout: 5000,
+            maximumAge: 0
+        });
+    } else {
+        error("Location is unavailable.");
+    }
+}
+
 function initCordova() {
     platform_type = "cordova";
 

www/pages/home.html

@@ -84,17 +84,25 @@
             <div class="col-100 tablet-50 desktop-33">
                 <div class="card card-expandable elevation-2" id="map-card" style="margin-top: var(--f7-card-margin-vertical);" onclick="openMapCard()">
 
-                    <div class="card-content text-align-center" style="min-height: 16.58em;">
-
-                        <div class="card-header card-opened-fade-out" style="z-index: 9999999; background-color: rgba(255,255,255,0.5);">
-                            Nearby
+                    <div class="card-header card-opened-fade-out" style="z-index: 9999999; background-color: rgba(255,255,255,0.5);">
+                        <div>Nearby</div>
+                        <div>
+                            <span class="link icon-only card-prevent-open" onclick="recenterMapToUserPosition()" style="margin-top: 0.1em; cursor: pointer;">
+                                <i class="material-icons" style="font-size: 16pt;">my_location</i>
+                            </span>
                         </div>
+                    </div>
+
+                    <div class="card-content text-align-center" style="min-height: 16.58em;">
 
                         <div class="navbar card-opened-fade-in">
                             <div class="navbar-inner">
                                 <div class="title">Nearby</div>
 
                                 <div class="right">
+                                    <a href="" class="link icon-only" onclick="recenterMapToUserPosition()">
+                                        <i class="material-icons">my_location</i>
+                                    </a>
                                     <a href="#" class="link icon-only card-close">
                                         <i class="material-icons">close</i>
                                     </a>
@@ -124,11 +132,11 @@
     <script src="js/home.js"></script>
 
     <script>
-                    setTimeout(function () {
-                        loadHomePage(function () {
+                                        setTimeout(function () {
+                                            loadHomePage(function () {
 
-                        });
-                    }, 500);
+                                            });
+                                        }, 500);
     </script>
 
 </div>