From 74a42abe722a12a038aa28fbdf38a7206b859200 Mon Sep 17 00:00:00 2001
From: "Phyks (Lucas Verney)" <phyks@phyks.me>
Date: Sat, 21 Jul 2018 20:00:37 +0200
Subject: [PATCH] Add a way to share a specific map position

Also rework the way Map component is handled to make it cleaner and more
efficient.

Fix for issue #23.
---
 src/App.vue                           |  28 ++-
 src/components/LocationError.vue      |  37 ++++
 src/components/Map.vue                | 266 ++++++++++++++---------
 src/components/Modal.vue              |  42 ++++
 src/components/ReportDialog/index.vue |  44 +++-
 src/components/ShareMapViewModal.vue  |  84 ++++++++
 src/constants.js                      |   8 +-
 src/i18n/en.json                      |  12 +-
 src/router/index.js                   |   7 +-
 src/store/actions.js                  |  54 ++++-
 src/store/mutations-types.js          |   7 +-
 src/store/mutations.js                |  50 ++++-
 src/{components => views}/About.vue   |   0
 src/views/Map.vue                     | 298 ++++++++++++++------------
 14 files changed, 664 insertions(+), 273 deletions(-)
 create mode 100644 src/components/LocationError.vue
 create mode 100644 src/components/Modal.vue
 create mode 100644 src/components/ShareMapViewModal.vue
 rename src/{components => views}/About.vue (100%)

diff --git a/src/App.vue b/src/App.vue
index 95c7519..e261ff9 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -7,13 +7,13 @@
                 <v-toolbar-title v-text="title" class="ma-0"></v-toolbar-title>
             </router-link>
             <v-spacer></v-spacer>
-            <v-menu offset-y class="menu">
+            <v-menu offset-y class="menu" v-if="$route.name === 'Onboarding' || $route.name === 'Map' || $route.name === 'SharedMap'">
                 <v-btn slot="activator" icon role="button" :aria-label="$t('buttons.menu')">
                     <v-icon>more_vert</v-icon>
                 </v-btn>
                 <v-list>
-                    <v-list-tile @click="goToMap">
-                        <v-list-tile-title>{{ $t("menu.Map") }}</v-list-tile-title>
+                    <v-list-tile @click="isShareMapViewModalShown = true" v-if="isShareMapViewMenuEntryVisible">
+                        <v-list-tile-title>{{ $t("menu.shareMapView") }}</v-list-tile-title>
                     </v-list-tile>
                     <v-list-tile @click="goToAbout">
                         <v-list-tile-title>{{ $t("menu.About") }}</v-list-tile-title>
@@ -23,35 +23,47 @@
                     </v-list-tile>
                 </v-list>
             </v-menu>
+            <v-btn icon role="button" :aria-label="$t('buttons.back')" v-else @click="goBack">
+                <v-icon>arrow_back</v-icon>
+            </v-btn>
             <div>
                 <v-progress-linear v-if="isLoading" :indeterminate="true" class="progressBar"></v-progress-linear>
             </div>
         </v-toolbar>
         <v-content>
-            <router-view/>
+            <ShareMapViewModal v-model="isShareMapViewModalShown"></ShareMapViewModal>
+            <router-view></router-view>
         </v-content>
     </v-app>
 </template>
 
 <script>
+import ShareMapViewModal from '@/components/ShareMapViewModal.vue';
+
 export default {
+    components: {
+        ShareMapViewModal,
+    },
     computed: {
         isLoading() {
             return this.$store.state.isLoading;
         },
+        isShareMapViewMenuEntryVisible() {
+            return this.$store.state.map.center.every(item => item !== null);
+        },
     },
     data() {
         return {
-            title: 'Cycl\'Assist',
+            isShareMapViewModalShown: false,
+            title: "Cycl'Assist",
         };
     },
-    name: 'App',
     methods: {
         goToAbout() {
             this.$router.push({ name: 'About' });
         },
-        goToMap() {
-            this.$router.push({ name: 'Map' });
+        goBack() {
+            this.$router.go(-1);
         },
         goToSettings() {
             this.$router.push({ name: 'Settings' });
diff --git a/src/components/LocationError.vue b/src/components/LocationError.vue
new file mode 100644
index 0000000..b30be3c
--- /dev/null
+++ b/src/components/LocationError.vue
@@ -0,0 +1,37 @@
+<template>
+    <div>
+        <p class="text-xs-center">{{ error }}</p>
+        <p class="text-xs-center">
+            <v-btn role="button" color="blue" dark @click="retryFunction">{{ $t('misc.retry') }}</v-btn>
+        </p>
+        <p>{{ $t('misc.or') }}</p>
+        <p>
+            <AddressInput
+                :label="$t('locationPicker.pickALocationManually')"
+                :onInput="onManualLocationPicker"
+                ></AddressInput>
+        </p>
+    </div>
+</template>
+
+<script>
+import AddressInput from '@/components/AddressInput.vue';
+
+export default {
+    components: {
+        AddressInput,
+    },
+    methods: {
+        onManualLocationPicker(value) {
+            this.$store.dispatch(
+                'setCurrentPosition',
+                { latLng: [value.latlng.lat, value.latlng.lng] },
+            );
+        },
+    },
+    props: {
+        error: String,
+        retryFunction: Function,
+    },
+};
+</script>
diff --git a/src/components/Map.vue b/src/components/Map.vue
index ed735a7..332ba74 100644
--- a/src/components/Map.vue
+++ b/src/components/Map.vue
@@ -1,12 +1,33 @@
 <template>
     <div class="fill-height fill-width">
-        <v-lmap ref="map" :minZoom="this.minZoom" :maxZoom="this.maxZoom" :options="{ zoomControl: false }" @click="handleClick" @movestart="onMoveStart" @zoomstart="onZoomStart">
+        <v-lmap
+            ref="map"
+            :minZoom="this.minZoom"
+            :maxZoom="this.maxZoom"
+            :options="{ zoomControl: false }"
+            @click="handleClick"
+            @movestart="onMoveStart"
+            @moveend="onMoveEnd"
+            @zoomstart="onZoomStart"
+            >
             <v-ltilelayer :url="tileServer" :attribution="attribution"></v-ltilelayer>
 
-            <v-lts v-if="heading !== null" :lat-lng="positionLatLng" :options="markerOptions"></v-lts>
-            <v-lcirclemarker v-else :lat-lng="positionLatLng" :color="markerOptions.color" :fillColor="markerOptions.fillColor" :fillOpacity="1.0" :weight="markerOptions.weight" :radius="markerRadius"></v-lcirclemarker>
+            <template v-if="positionLatLng">
+                <v-lts v-if="heading !== null" :lat-lng="positionLatLng" :options="markerOptions"></v-lts>
+                <v-lcirclemarker
+                    v-else
+                    :lat-lng="positionLatLng"
+                    :color="markerOptions.color"
+                    :fillColor="markerOptions.fillColor"
+                    :fillOpacity="1.0"
+                    :weight="markerOptions.weight"
+                    :radius="markerRadius"
+                    >
+                </v-lcirclemarker>
+
+                <v-lcircle v-if="shouldDisplayAccuracy" :lat-lng="positionLatLng" :radius="radiusFromAccuracy"></v-lcircle>
+            </template>
 
-            <v-lcircle v-if="shouldDisplayAccuracy" :lat-lng="positionLatLng" :radius="radiusFromAccuracy"></v-lcircle>
             <v-lpolyline :latLngs="polyline" :opacity="0.6" color="#00FF00"></v-lpolyline>
 
             <v-lmarker v-if="reportLatLng" :lat-lng="reportLatLng" :icon="unknownMarkerIcon"></v-lmarker>
@@ -21,7 +42,7 @@
             left
             color="blue"
             class="overlayButton"
-            v-if="recenterButton"
+            v-if="isRecenterButtonShown"
             @click.native.stop="recenterMap"
             role="button"
             :aria-label="$t('buttons.recenterMap')"
@@ -56,21 +77,20 @@ export default {
     components: {
         ReportMarker,
     },
-    props: {
-        accuracy: {
-            type: Number,
-            default: null,
-        },
-        heading: Number,  // in degrees, clockwise wrt north
-        markers: Array,
-        onPress: Function,
-        polyline: Array,
-        positionLatLng: Array,
-        reportLatLng: Array,
-    },
     computed: {
+        markerOptions() {
+            return {
+                fillColor: '#00ff00',
+                color: '#000000',
+                heading: this.heading * (Math.PI / 180), // in radians from North
+                weight: 1,
+            };
+        },
         radiusFromAccuracy() {
             if (this.accuracy) {
+                // Compute the radius (in pixels) based on GPS accuracy, taking
+                // into account the current zoom level
+                // Formula coming from https://wiki.openstreetmap.org/wiki/Zoom_levels.
                 return this.accuracy / (
                     (constants.EARTH_RADIUS * 2 * Math.PI * Math.cos(this.positionLatLng[0] *
                         (Math.PI / 180))) /
@@ -80,19 +100,92 @@ export default {
             return null;
         },
         shouldDisplayAccuracy() {
+            // Only display accuracy if circle is large enough
             return (
                 this.accuracy &&
-                this.accuracy < 100 &&
+                this.accuracy < constants.ACCURACY_DISPLAY_THRESHOLD &&
                 this.radiusFromAccuracy > this.markerRadius
             );
         },
-        markerOptions() {
-            return {
-                fillColor: '#00ff00',
-                color: '#000000',
-                heading: this.heading * (Math.PI / 180),
-                weight: 1,
+    },
+    data() {
+        return {
+            attribution: this.$t('map.attribution'),
+            isProgrammaticMove: false,
+            isProgrammaticZoom: false,
+            map: null,
+            markerRadius: 10.0,
+            maxZoom: constants.MAX_ZOOM,
+            minZoom: constants.MIN_ZOOM,
+            isRecenterButtonShown: false,
+            tileServer: constants.TILE_SERVERS[this.$store.state.settings.tileServer],
+            unknownMarkerIcon: L.icon({
+                iconAnchor: [20, 40],
+                iconSize: [40, 40],
+                iconUrl: unknownMarkerIcon,
+            }),
+        };
+    },
+    methods: {
+        handleClick(event) {
+            if (this.onPress) {
+                this.onPress(event.latlng);
+            }
+        },
+        hideRecenterButton() {
+            if (this.isRecenterButtonShown) {
+                this.isRecenterButtonShown = false;
+            }
+        },
+        onMoveStart() {
+            if (!this.isProgrammaticMove && !this.isProgrammaticZoom) {
+                this.showRecenterButton();
+            }
+        },
+        onMoveEnd() {
+            if (this.onMapCenterUpdate) {
+                const mapCenter = this.map.getCenter();
+                this.onMapCenterUpdate([mapCenter.lat, mapCenter.lng]);
+            }
+            if (this.onMapZoomUpdate) {
+                this.onMapZoomUpdate(this.map.getZoom());
+            }
+        },
+        onZoomStart() {
+            if (!this.isProgrammaticZoom) {
+                this.showRecenterButton();
+            }
+        },
+        recenterMap() {
+            this.hideRecenterButton();
+            if (this.map.getZoom() !== this.zoom) {
+                this.isProgrammaticZoom = true;
+                this.map.once('zoomend', () => { this.isProgrammaticZoom = false; });
+            }
+            const mapCenter = this.map.getCenter();
+            if (
+                mapCenter.lat !== this.center[0] &&
+                mapCenter.lng !== this.center[1]
+            ) {
+                this.isProgrammaticMove = true;
+                this.map.once('moveend', () => { this.isProgrammaticMove = false; });
+            }
+            this.map.setView(this.center, this.zoom);
+        },
+        showCompass() {
+            const north = L.control({ position: 'topright' });
+            north.onAdd = () => {
+                const div = L.DomUtil.create('div', 'compassIcon legend');
+                div.innerHTML = `<img src="${compassNorthIcon}">`;
+                L.DomEvent.disableClickPropagation(div);
+                return div;
             };
+            this.map.addControl(north);
+        },
+        showRecenterButton() {
+            if (!this.isRecenterButtonShown) {
+                this.isRecenterButtonShown = true;
+            }
         },
     },
     mounted() {
@@ -101,31 +194,66 @@ export default {
             this.isProgrammaticZoom = true;
             this.map.once('zoomend', () => { this.isProgrammaticZoom = false; });
         }
+        const mapCenter = this.map.getCenter();
         if (
-            this.map.getCenter().lat !== this.positionLatLng[0] &&
-            this.map.getCenter().lng !== this.positionLatLng[1]
+            mapCenter.lat !== this.center[0] &&
+            mapCenter.lng !== this.center[1]
         ) {
             this.isProgrammaticMove = true;
             this.map.once('moveend', () => { this.isProgrammaticMove = false; });
         }
-        this.map.setView(this.positionLatLng, this.zoom);
+        this.map.setView(this.center, this.zoom);
         this.showCompass();
     },
+    props: {
+        accuracy: Number,
+        center: {
+            type: Array,
+            required: true,
+        },
+        heading: Number, // in degrees, clockwise wrt north
+        markers: Array,
+        onPress: Function,
+        onMapCenterUpdate: Function,
+        onMapZoomUpdate: Function,
+        polyline: Array,
+        positionLatLng: Array,
+        reportLatLng: Array,
+        zoom: {
+            type: Number,
+            required: true,
+        },
+    },
     watch: {
-        positionLatLng(newPositionLatLng) {
+        zoom(newZoom) {
             if (!this.map) {
                 // Map should have been created
                 return;
             }
-            if (!this.recenterButton) {
+            if (!this.isRecenterButtonShown) {
+                // Handle programmatic navigation
+                if (this.map.getZoom() !== newZoom) {
+                    this.isProgrammaticZoom = true;
+                    this.map.once('zoomend', () => { this.isProgrammaticZoom = false; });
+                }
+                this.map.setZoom(newZoom);
+            }
+        },
+        center(newCenterLatLng) {
+            if (!this.map) {
+                // Map should have been created
+                return;
+            }
+
+            if (!this.isRecenterButtonShown) {
                 // Handle programmatic navigation
                 if (this.map.getZoom() !== this.zoom) {
                     this.isProgrammaticZoom = true;
                     this.map.once('zoomend', () => { this.isProgrammaticZoom = false; });
                 }
                 if (
-                    this.map.getCenter().lat !== newPositionLatLng[0] &&
-                    this.map.getCenter().lng !== newPositionLatLng[1]
+                    this.map.getCenter().lat !== newCenterLatLng[0] &&
+                    this.map.getCenter().lng !== newCenterLatLng[1]
                 ) {
                     this.isProgrammaticMove = true;
                     this.map.once('moveend', () => { this.isProgrammaticMove = false; });
@@ -138,7 +266,7 @@ export default {
                         const distances = this.markers.map(
                             marker => ({
                                 id: marker.id,
-                                distance: distance(newPositionLatLng, marker.latLng),
+                                distance: distance(newCenterLatLng, marker.latLng),
                             }),
                         ).filter(item => item.distance < constants.MIN_DISTANCE_REPORT_DETAILS);
                         const closestReport = distances.reduce(  // Get the closest one
@@ -155,82 +283,10 @@ export default {
                         }
                     }
                 }
-                this.map.setView(newPositionLatLng, this.zoom);
+                this.map.setView(newCenterLatLng, this.zoom);
             }
         },
     },
-    data() {
-        return {
-            attribution: 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors',
-            zoom: constants.DEFAULT_ZOOM,
-            markerRadius: 10.0,
-            minZoom: constants.MIN_ZOOM,
-            maxZoom: constants.MAX_ZOOM,
-            tileServer: constants.TILE_SERVERS[this.$store.state.settings.tileServer],
-            isMouseDown: false,
-            isProgrammaticZoom: false,
-            isProgrammaticMove: false,
-            recenterButton: false,
-            map: null,
-            unknownMarkerIcon: L.icon({
-                iconUrl: unknownMarkerIcon,
-                iconSize: [40, 40],
-                iconAnchor: [20, 40],
-            }),
-        };
-    },
-    methods: {
-        handleClick(event) {
-            if (this.onPress) {
-                this.onPress(event.latlng);
-            }
-        },
-        onMoveStart() {
-            if (!this.isProgrammaticMove) {
-                this.showRecenterButton();
-            }
-        },
-        onZoomStart() {
-            if (!this.isProgrammaticZoom) {
-                this.showRecenterButton();
-            }
-        },
-        showCompass() {
-            const north = L.control({ position: 'topright' });
-            north.onAdd = () => {
-                const div = L.DomUtil.create('div', 'compassIcon legend');
-                div.innerHTML = `<img src="${compassNorthIcon}">`;
-                L.DomEvent.disableClickPropagation(div);
-                return div;
-            };
-            this.map.addControl(north);
-        },
-        showRecenterButton() {
-            if (!this.recenterButton) {
-                this.recenterButton = true;
-            }
-        },
-        hideRecenterButton() {
-            if (this.recenterButton) {
-                this.recenterButton = false;
-            }
-        },
-        recenterMap() {
-            this.hideRecenterButton();
-            if (this.map.getZoom() !== this.zoom) {
-                this.isProgrammaticZoom = true;
-                this.map.once('zoomend', () => { this.isProgrammaticZoom = false; });
-            }
-            if (
-                this.map.getCenter().lat !== this.positionLatLng[0] &&
-                this.map.getCenter().lng !== this.positionLatLng[1]
-            ) {
-                this.isProgrammaticMove = true;
-                this.map.once('moveend', () => { this.isProgrammaticMove = false; });
-            }
-            this.map.setView(this.positionLatLng, this.zoom);
-        },
-    },
 };
 </script>
 
diff --git a/src/components/Modal.vue b/src/components/Modal.vue
new file mode 100644
index 0000000..927b163
--- /dev/null
+++ b/src/components/Modal.vue
@@ -0,0 +1,42 @@
+<template>
+    <v-dialog v-model="isModalShown" max-width="290">
+        <slot></slot>
+    </v-dialog>
+</template>
+
+<script>
+export default {
+    beforeDestroy() {
+        window.removeEventListener('keydown', this.hideModalOnEsc);
+    },
+    computed: {
+        isModalShown: {
+            get() {
+                return this.value;
+            },
+            set(val) {
+                this.$emit('input', val);
+            },
+        },
+    },
+    methods: {
+        hideModalOnEsc(event) {
+            let isEscape = false;
+            if ('key' in event) {
+                isEscape = (event.key === 'Escape' || event.key === 'Esc');
+            } else {
+                isEscape = (event.keyCode === 27);
+            }
+            if (isEscape) {
+                this.isModalShown = false;
+            }
+        },
+    },
+    mounted() {
+        window.addEventListener('keydown', this.hideModalOnEsc);
+    },
+    props: {
+        value: Boolean,
+    },
+};
+</script>
diff --git a/src/components/ReportDialog/index.vue b/src/components/ReportDialog/index.vue
index 1f291e2..6f4af7e 100644
--- a/src/components/ReportDialog/index.vue
+++ b/src/components/ReportDialog/index.vue
@@ -1,6 +1,6 @@
 <template>
     <div>
-        <v-dialog v-model="error" max-width="290">
+        <Modal v-model="error">
             <v-card>
                 <v-card-title class="subheading">{{ $t('reportDialog.unableToSendTitle') }}</v-card-title>
 
@@ -22,7 +22,7 @@
                     <v-spacer></v-spacer>
                 </v-card-actions>
             </v-card>
-        </v-dialog>
+        </Modal>
         <v-bottom-sheet v-model="isActive">
             <v-card>
                 <v-container fluid>
@@ -38,16 +38,16 @@
 <script>
 import { REPORT_TYPES, REPORT_TYPES_ORDER } from '@/constants';
 
+import Modal from '@/components/Modal.vue';
 import ReportTile from './ReportTile.vue';
 
 export default {
-    components: {
-        ReportTile,
+    beforeDestroy() {
+        window.removeEventListener('keydown', this.hideReportDialogOnEsc);
     },
-    props: {
-        value: Boolean,
-        lat: Number,
-        lng: Number,
+    components: {
+        Modal,
+        ReportTile,
     },
     computed: {
         isActive: {
@@ -55,6 +55,9 @@ export default {
                 return this.value;
             },
             set(val) {
+                if (val === false) {
+                    this.onHide();
+                }
                 this.$emit('input', val);
             },
         },
@@ -67,18 +70,37 @@ export default {
         };
     },
     methods: {
+        hideReportDialogOnEsc(event) {
+            let isEscape = false;
+            if ('key' in event) {
+                isEscape = (event.key === 'Escape' || event.key === 'Esc');
+            } else {
+                isEscape = (event.keyCode === 27);
+            }
+            if (isEscape) {
+                this.isActive = false;
+            }
+        },
         saveReport(type) {
-            this.isActive = !this.isActive;
+            this.isActive = false;
             return this.$store.dispatch('saveReport', {
                 type,
-                lat: this.lat,
-                lng: this.lng,
+                lat: this.latLng[0],
+                lng: this.latLng[1],
             }).catch((exc) => {
                 console.error(exc);
                 this.error = exc;
             });
         },
     },
+    mounted() {
+        window.addEventListener('keydown', this.hideReportDialogOnEsc);
+    },
+    props: {
+        value: Boolean,
+        latLng: Array,
+        onHide: Function,
+    },
 };
 </script>
 
diff --git a/src/components/ShareMapViewModal.vue b/src/components/ShareMapViewModal.vue
new file mode 100644
index 0000000..748ca77
--- /dev/null
+++ b/src/components/ShareMapViewModal.vue
@@ -0,0 +1,84 @@
+<template>
+    <Modal v-model="isActive">
+        <v-card>
+            <v-card-title class="headline">{{ $t('shareMapViewModal.shareCurrentMapView') }}</v-card-title>
+
+            <v-card-text>
+                {{ $t('shareMapViewModal.copyURLToShareCurrentMapView') }}
+
+                <v-text-field ref="shareLinkRef" readonly :hint="shareLinkHint" @click="copyShareLink" v-model="shareMapViewURL" prepend-icon="share"></v-text-field>
+            </v-card-text>
+
+            <v-card-actions>
+                <v-spacer></v-spacer>
+
+                <v-btn
+                    color="green darken-1"
+                    @click="isActive = false"
+                    dark
+                    large
+                    role="button"
+                    >
+                    {{ $t('misc.ok') }}
+                </v-btn>
+
+                    <v-spacer></v-spacer>
+            </v-card-actions>
+        </v-card>
+    </Modal>
+</template>
+
+<script>
+import { DEFAULT_ZOOM } from '@/constants';
+
+import Modal from '@/components/Modal.vue';
+
+export default {
+    components: {
+        Modal,
+    },
+    computed: {
+        isActive: {
+            get() {
+                return this.value;
+            },
+            set(val) {
+                this.$emit('input', val);
+            },
+        },
+        shareMapViewURL() {
+            const currentMapCenter = this.$store.state.map.center;
+            if (!currentMapCenter.every(item => item !== null)) {
+                return null;
+            }
+            const currentMapZoom = this.$store.state.map.zoom || DEFAULT_ZOOM;
+            const path = this.$router.resolve({
+                name: 'SharedMap',
+                params: {
+                    lat: currentMapCenter[0],
+                    lng: currentMapCenter[1],
+                    zoom: currentMapZoom,
+                },
+            }).href;
+            return `${window.location.origin}/${path}`;
+        },
+    },
+    data() {
+        return {
+            shareLinkHint: null,
+        };
+    },
+    methods: {
+        copyShareLink() {
+            this.$refs.shareLinkRef.$el.querySelector('input').select();
+            if (document.queryCommandSupported && document.queryCommandSupported('copy')) {
+                document.execCommand('copy');
+                this.shareLinkHint = this.$t('shareMapViewModal.copiedToClipboard');
+            }
+        },
+    },
+    props: {
+        value: Boolean,
+    },
+};
+</script>
diff --git a/src/constants.js b/src/constants.js
index 7bae26b..43b2b22 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -113,19 +113,21 @@ export const REPORT_TYPES_ORDER = ['gcum', 'interrupt', 'obstacle', 'pothole', '
 export const MIN_DISTANCE_REPORT_DETAILS = 40;  // in meters
 
 export const MOCK_LOCATION = false;
-export const MOCK_LOCATION_UPDATE_INTERVAL = 5 * 1000;
+export const MOCK_LOCATION_UPDATE_INTERVAL = 5 * 1000; // in milliseconds
 
-export const UPDATE_REPORTS_DISTANCE_THRESHOLD = 500;
+export const UPDATE_REPORTS_DISTANCE_THRESHOLD = 500; // in meters
 
 // Minimal ratio between upvotes and downvotes needed for a report to be shown
 export const REPORT_VOTES_THRESHOLD = 0.5;
 
-export const EARTH_RADIUS = 6378137;
+export const EARTH_RADIUS = 6378137; // in meters
 
 export const DEFAULT_ZOOM = 17;
 export const MIN_ZOOM = 10;
 export const MAX_ZOOM = 18;
 
+export const ACCURACY_DISPLAY_THRESHOLD = 100; // in meters
+
 let opencyclemapURL = 'https://tile.thunderforest.com/cycle/{z}/{x}/{y}.png';
 if (process.env.THUNDERFOREST_API_KEY) {
     opencyclemapURL += `?apikey=${process.env.THUNDERFOREST_API_KEY}`;
diff --git a/src/i18n/en.json b/src/i18n/en.json
index 9f827fe..7bf28fd 100644
--- a/src/i18n/en.json
+++ b/src/i18n/en.json
@@ -8,6 +8,7 @@
         "usageDescription": "Use the button in the lower right corner to add a new report at your current location. To add a report elsewhere, do a click where you want the report to be shown. Press on a marker on the map to display more informations and report the problem as being still there or solved."
     },
     "buttons": {
+        "back": "Back",
         "close": "Close",
         "downvote": "Downvote",
         "menu": "Menu",
@@ -36,13 +37,17 @@
         "invalidSelection": "Invalid selection",
         "pickALocationManually": "pick a location manually"
     },
+    "map": {
+        "attribution": "Map data © <a href=\"http://openstreetmap.org\">OpenStreetMap</a> contributors"
+    },
     "menu": {
         "About": "Help",
-        "Map": "Map",
+        "shareMapView": "Share map view",
         "Settings": "Settings"
     },
     "misc": {
         "discard": "Discard",
+        "ok": "OK",
         "or": "or",
         "retry": "Retry",
         "spaceBeforeDoublePunctuations": ""
@@ -74,5 +79,10 @@
         "save": "Save",
         "skipOnboarding": "Skip onboarding",
         "tileServer": "Map tiles server"
+    },
+    "shareMapViewModal": {
+        "copiedToClipboard": "Copied to clipboard!",
+        "copyURLToShareCurrentMapView": "Copy the URL below to share the current map view.",
+        "shareCurrentMapView": "Share current map view"
     }
 }
diff --git a/src/router/index.js b/src/router/index.js
index 399a5d6..ea409ce 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -1,6 +1,6 @@
 import Vue from 'vue';
 import Router from 'vue-router';
-import About from '@/components/About.vue';
+import About from '@/views/About.vue';
 import Map from '@/views/Map.vue';
 import Onboarding from '@/views/Onboarding.vue';
 import Settings from '@/views/Settings.vue';
@@ -14,6 +14,11 @@ export default new Router({
             name: 'About',
             component: About,
         },
+        {
+            path: '/map=:zoom/:lat/:lng',
+            name: 'SharedMap',
+            component: Map,
+        },
         {
             path: '/map',
             name: 'Map',
diff --git a/src/store/actions.js b/src/store/actions.js
index 43660bd..1dacbae 100644
--- a/src/store/actions.js
+++ b/src/store/actions.js
@@ -1,13 +1,19 @@
 import moment from 'moment';
 
 import * as api from '@/api';
+import * as constants from '@/constants';
 import i18n from '@/i18n';
 
 import {
     INTRO_WAS_SEEN,
-    IS_LOADING,
     IS_DONE_LOADING,
+    IS_LOADING,
     PUSH_REPORT,
+    SET_CURRENT_MAP_CENTER,
+    SET_CURRENT_MAP_ZOOM,
+    SET_CURRENT_POSITION,
+    SET_LOCATION_ERROR,
+    SET_LOCATION_WATCHER_ID,
     SET_SETTING,
     SHOW_REPORT_DETAILS,
     STORE_REPORTS,
@@ -61,3 +67,49 @@ export function setSetting({ commit }, { setting, value }) {
 export function markIntroAsSeen({ commit }) {
     return commit(INTRO_WAS_SEEN);
 }
+
+export function setCurrentMapCenter({ commit, state }, { center }) {
+    if (state.map.center.some((item, index) => item !== center[index])) {
+        commit(SET_CURRENT_MAP_CENTER, { center });
+    }
+}
+
+export function setCurrentMapZoom({ commit, state }, { zoom }) {
+    if (state.map.zoom !== zoom) {
+        commit(SET_CURRENT_MAP_ZOOM, { zoom });
+    }
+}
+
+export function setCurrentPosition(
+    { commit, state },
+    { accuracy = null, heading = null, latLng = null },
+) {
+    const locationState = state.location;
+    if (
+        accuracy !== locationState.accuracy ||
+        heading !== locationState.heading ||
+        locationState.currentLatLng.some((item, index) => item !== latLng[index])
+    ) {
+        // Throttle mutations if nothing has changed
+        commit(SET_CURRENT_POSITION, { accuracy, heading, latLng });
+    }
+}
+
+export function setLocationWatcherId({ commit }, { id }) {
+    return commit(SET_LOCATION_WATCHER_ID, { id });
+}
+
+export function setLocationError({ commit, state }, { error }) {
+    // Unregister location watcher
+    const watcherID = state.location.watcherID;
+    if (watcherID !== null) {
+        if (constants.MOCK_LOCATION) {
+            clearInterval(watcherID);
+        } else {
+            navigator.geolocation.clearWatch(watcherID);
+        }
+    }
+
+    commit(SET_LOCATION_WATCHER_ID, { id: null });
+    commit(SET_LOCATION_ERROR, { error });
+}
diff --git a/src/store/mutations-types.js b/src/store/mutations-types.js
index 8503b60..066ba13 100644
--- a/src/store/mutations-types.js
+++ b/src/store/mutations-types.js
@@ -1,7 +1,12 @@
 export const INTRO_WAS_SEEN = 'INTRO_WAS_SEEN';
-export const IS_LOADING = 'IS_LOADING';
 export const IS_DONE_LOADING = 'IS_DONE_LOADING';
+export const IS_LOADING = 'IS_LOADING';
 export const PUSH_REPORT = 'PUSH_REPORT';
+export const SET_CURRENT_MAP_CENTER = 'SET_CURRENT_MAP_CENTER';
+export const SET_CURRENT_MAP_ZOOM = 'SET_CURRENT_MAP_ZOOM';
+export const SET_CURRENT_POSITION = 'SET_CURRENT_POSITION';
+export const SET_LOCATION_ERROR = 'SET_LOCATION_ERROR';
+export const SET_LOCATION_WATCHER_ID = 'SET_LOCATION_WATCHER_ID';
 export const SET_SETTING = 'SET_SETTING';
 export const SHOW_REPORT_DETAILS = 'SHOW_REPORT_DETAILS';
 export const STORE_REPORTS = 'STORE_REPORTS';
diff --git a/src/store/mutations.js b/src/store/mutations.js
index e91cdb6..a97df3f 100644
--- a/src/store/mutations.js
+++ b/src/store/mutations.js
@@ -54,6 +54,18 @@ if (storageAvailable('localStorage')) {
 export const initialState = {
     hasGoneThroughIntro: false,
     isLoading: false,
+    location: {
+        accuracy: null,
+        currentLatLng: [null, null],
+        error: null,
+        heading: null, // in degrees, clockwise wrt north
+        positionHistory: [],
+        watcherID: null,
+    },
+    map: {
+        center: [null, null],
+        zoom: null,
+    },
     reportDetails: {
         id: null,
         userAsked: null,
@@ -71,11 +83,37 @@ export const mutations = {
     [types.INTRO_WAS_SEEN](state) {
         state.hasGoneThroughIntro = true;
     },
+    [types.IS_DONE_LOADING](state) {
+        state.isLoading = false;
+    },
     [types.IS_LOADING](state) {
         state.isLoading = true;
     },
-    [types.IS_DONE_LOADING](state) {
-        state.isLoading = false;
+    [types.PUSH_REPORT](state, { report }) {
+        const reportIndex = state.reports.findIndex(item => item.id === report.id);
+        if (reportIndex === -1) {
+            state.reports.push(report);
+        } else {
+            Vue.set(state.reports, reportIndex, report);
+        }
+    },
+    [types.SET_CURRENT_MAP_CENTER](state, { center }) {
+        Vue.set(state.map, 'center', center);
+    },
+    [types.SET_CURRENT_MAP_ZOOM](state, { zoom }) {
+        Vue.set(state.map, 'zoom', zoom);
+    },
+    [types.SET_CURRENT_POSITION](state, { accuracy, heading, latLng }) {
+        Vue.set(state.location, 'accuracy', accuracy);
+        Vue.set(state.location, 'currentLatLng', latLng);
+        Vue.set(state.location, 'heading', heading);
+        state.location.positionHistory.push(latLng);
+    },
+    [types.SET_LOCATION_ERROR](state, { error }) {
+        Vue.set(state.location, 'error', error);
+    },
+    [types.SET_LOCATION_WATCHER_ID](state, { id }) {
+        Vue.set(state.location, 'watcherID', id);
     },
     [types.SET_SETTING](state, { setting, value }) {
         if (storageAvailable('localStorage')) {
@@ -90,12 +128,4 @@ export const mutations = {
     [types.STORE_REPORTS](state, { reports }) {
         state.reports = reports;
     },
-    [types.PUSH_REPORT](state, { report }) {
-        const reportIndex = state.reports.findIndex(item => item.id === report.id);
-        if (reportIndex === -1) {
-            state.reports.push(report);
-        } else {
-            Vue.set(state.reports, reportIndex, report);
-        }
-    },
 };
diff --git a/src/components/About.vue b/src/views/About.vue
similarity index 100%
rename from src/components/About.vue
rename to src/views/About.vue
diff --git a/src/views/Map.vue b/src/views/Map.vue
index dbd208f..f283b0d 100644
--- a/src/views/Map.vue
+++ b/src/views/Map.vue
@@ -2,8 +2,20 @@
     <v-container fluid fill-height class="no-padding">
         <v-layout row wrap fill-height>
             <ReportCard></ReportCard>
-            <v-flex xs12 fill-height v-if="latLng">
-                <Map :positionLatLng="latLng" :reportLatLng="reportLatLng" :polyline="positionHistory" :heading="heading" :accuracy="accuracy" :markers="reportsMarkers" :onPress="showReportDialog"></Map>
+            <v-flex xs12 fill-height v-if="mapCenter">
+                <Map
+                    :accuracy="accuracy"
+                    :center="mapCenter"
+                    :heading="heading"
+                    :markers="reportsMarkers"
+                    :onMapCenterUpdate="onMapCenterUpdate"
+                    :onMapZoomUpdate="onMapZoomUpdate"
+                    :onPress="showReportDialog"
+                    :polyline="positionHistory"
+                    :positionLatLng="currentLatLng"
+                    :reportLatLng="reportLatLng"
+                    :zoom="mapZoom"
+                    ></Map>
                 <v-btn
                     absolute
                     dark
@@ -16,25 +28,15 @@
                     @click.native.stop="() => showReportDialog()"
                     role="button"
                     :aria-label="$t('buttons.reportProblem')"
+                    v-if="!hasCenterProvidedByRoute"
                     >
                     <v-icon>report_problem</v-icon>
                 </v-btn>
-                <ReportDialog v-model="dialog" :lat="reportLat" :lng="reportLng"></ReportDialog>
+                <ReportDialog v-model="isReportDialogVisible" :latLng="reportLatLng" :onHide="resetReportLatLng"></ReportDialog>
             </v-flex>
             <v-flex xs12 sm6 offset-sm3 md4 offset-md4 fill-height v-else class="pa-3">
-                <template v-if="error">
-                    <p class="text-xs-center">{{ error }}</p>
-                    <p class="text-xs-center">
-                        <v-btn role="button" color="blue" dark @click="initializePositionWatching">Retry</v-btn>
-                    </p>
-                    <p>{{ $t('misc.or') }}</p>
-                    <p>
-                        <AddressInput :label="$t('locationPicker.pickALocationManually')" :onInput="onManualLocationPicker" v-model="manualLocation"></AddressInput>
-                    </p>
-                </template>
-                <template v-else>
-                    <p class="text-xs-center">{{ $t('geolocation.fetching') }}</p>
-                </template>
+                <LocationError :error="error" :retryFunction="initializePositionWatching" v-if="error"></LocationError>
+                <p class="text-xs-center" v-else>{{ $t('geolocation.fetching') }}</p>
             </v-flex>
         </v-layout>
     </v-container>
@@ -43,35 +45,117 @@
 <script>
 import NoSleep from 'nosleep.js';
 
-import AddressInput from '@/components/AddressInput.vue';
+import LocationError from '@/components/LocationError.vue';
 import Map from '@/components/Map.vue';
 import ReportCard from '@/components/ReportCard.vue';
 import ReportDialog from '@/components/ReportDialog/index.vue';
 
 import * as constants from '@/constants';
 import { distance, mockLocation } from '@/tools';
+
+import i18n from '@/i18n';
 import store from '@/store';
 
+function handlePositionError(error) {
+    // TODO: Not translated when changing locale
+    store.dispatch('setLocationError', { error: error.code });
+}
+
+function setPosition(position) {
+    const currentLatLng = store.state.location.currentLatLng;
+    if (currentLatLng) {
+        const distanceFromPreviousPoint = distance(
+            [currentLatLng[0], currentLatLng[1]],
+            [position.coords.latitude, position.coords.longitude],
+        );
+        if (distanceFromPreviousPoint > constants.UPDATE_REPORTS_DISTANCE_THRESHOLD) {
+            store.dispatch('fetchReports');
+        }
+    }
+    store.dispatch(
+        'setCurrentPosition',
+        {
+            accuracy: position.coords.accuracy ? position.coords.accuracy : null,
+            heading: (
+                (position.coords.heading !== null && !isNaN(position.coords.heading))
+                ? position.coords.heading
+                : null
+            ),
+            latLng: [position.coords.latitude, position.coords.longitude],
+        },
+    );
+}
+
 export default {
+    beforeDestroy() {
+        this.disableNoSleep();
+        this.$store.dispatch('hideReportDetails');
+    },
+    beforeRouteEnter(to, from, next) {
+        if (to.name !== 'SharedMap') {
+            // Check that intro was seen except if we are in SharedMap view.
+            // This is required in order to ensure NoSleep works well.
+            if (!store.state.hasGoneThroughIntro) {
+                return next({ name: 'Onboarding', replace: true });
+            }
+        }
+        return next();
+    },
     components: {
-        AddressInput,
+        LocationError,
         Map,
         ReportCard,
         ReportDialog,
     },
-    beforeRouteEnter(to, from, next) {
-        if (!store.state.hasGoneThroughIntro) {
-            return next({ name: 'Onboarding', replace: true });
-        }
-        return next();
-    },
-    beforeDestroy() {
-        this.disableNoSleep();
-        this.disablePositionWatching();
-        window.removeEventListener('keydown', this.hideReportDialogOnEsc);
-        this.$store.dispatch('hideReportDetails');
-    },
     computed: {
+        accuracy() {
+            return this.$store.state.location.accuracy;
+        },
+        currentLatLng() {
+            const currentLatLng = this.$store.state.location.currentLatLng;
+            // Check that this is a correct position
+            if (currentLatLng.some(item => item === null)) {
+                return null;
+            }
+            return currentLatLng;
+        },
+        error() {
+            const errorCode = this.$store.state.location.error;
+            if (errorCode) {
+                let errorString = `${i18n.t('geolocation.errorFetchingPosition')} `;
+                if (errorCode === 1) {
+                    errorString += i18n.t('geolocation.permissionDenied');
+                } else if (errorCode === 2) {
+                    errorString += i18n.t('geolocation.positionUnavailable');
+                } else {
+                    errorString += i18n.t('geolocation.timeout');
+                }
+                return errorString;
+            }
+            return null;
+        },
+        hasCenterProvidedByRoute() {
+            return this.$route.params.lat && this.$route.params.lng;
+        },
+        heading() {
+            return this.$store.state.location.heading;
+        },
+        mapCenter() {
+            if (this.hasCenterProvidedByRoute) {
+                return [this.$route.params.lat, this.$route.params.lng];
+            }
+            return this.currentLatLng;
+        },
+        mapZoom() {
+            return (
+                this.$route.params.zoom
+                ? parseInt(this.$route.params.zoom, 10)
+                : constants.DEFAULT_ZOOM
+            );
+        },
+        positionHistory() {
+            return this.$store.state.location.positionHistory;
+        },
         reportsMarkers() {
             return this.$store.getters.notDismissedReports.map(report => ({
                 id: report.id,
@@ -79,98 +163,62 @@ export default {
                 latLng: [report.attributes.lat, report.attributes.lng],
             }));
         },
-        reportLatLng() {
-            if (this.dialog && this.reportLat && this.reportLng) {
-                return [this.reportLat, this.reportLng];
-            }
-            return null;
-        },
     },
     data() {
         return {
-            accuracy: null,
-            centering: false,
-            dialog: false,
-            error: null,
-            heading: null,
-            latLng: null,
-            manualLocation: null,
+            isReportDialogVisible: false,
             noSleep: null,
-            positionHistory: [],
-            reportLat: null,
-            reportLng: null,
-            watchID: null,
+            reportLatLng: null,
         };
     },
     methods: {
-        initializePositionWatching() {
-            this.error = null; // Reset any error
-            this.disablePositionWatching(); // Ensure at most one at the same time
-
-            if (constants.MOCK_LOCATION) {
-                this.setPosition(mockLocation());
-                this.watchID = setInterval(
-                    () => this.setPosition(mockLocation()),
-                    constants.MOCK_LOCATION_UPDATE_INTERVAL,
-                );
-            } else {
-                if (!('geolocation' in navigator)) {
-                    this.error = this.$t('geolocation.unavailable');
-                }
-
-                this.watchID = navigator.geolocation.watchPosition(
-                    this.setPosition,
-                    this.handlePositionError,
-                    {
-                        enableHighAccuracy: true,
-                        maximumAge: 30000,
-                        timeout: 27000,
-                    },
-                );
-            }
-        },
-        disablePositionWatching() {
-            if (this.watchID !== null) {
-                if (constants.MOCK_LOCATION) {
-                    clearInterval(this.watchID);
-                } else {
-                    navigator.geolocation.clearWatch(this.watchID);
-                }
-            }
-        },
-        handlePositionError(error) {
-            this.error = `${this.$t('geolocation.errorFetchingPosition')} `;
-            if (error.code === 1) {
-                this.error += this.$t('geolocation.permissionDenied');
-            } else if (error.code === 2) {
-                this.error += this.$t('geolocation.positionUnavailable');
-            } else {
-                this.error += this.$t('geolocation.timeout');
-            }
-        },
-        setPosition(position) {
-            if (this.latLng) {
-                const distanceFromPreviousPoint = distance(
-                    [this.latLng[0], this.latLng[1]],
-                    [position.coords.latitude, position.coords.longitude],
-                );
-                if (distanceFromPreviousPoint > constants.UPDATE_REPORTS_DISTANCE_THRESHOLD) {
-                    this.$store.dispatch('fetchReports');
-                }
-            }
-            this.latLng = [position.coords.latitude, position.coords.longitude];
-            this.positionHistory.push(this.latLng);
-            this.heading = null;
-            if (position.coords.heading !== null && !isNaN(position.coords.heading)) {
-                this.heading = position.coords.heading;
-            }
-            this.accuracy = position.coords.accuracy ? position.coords.accuracy : null;
-        },
         disableNoSleep() {
             if (this.noSleep) {
                 this.noSleep.disable();
             }
         },
+        initializePositionWatching() {
+            if (this.$store.state.location.watcherID !== null) {
+                // Already watching location, no need to add another watcher
+                return;
+            }
+
+            this.$store.dispatch('setLocationError', { error: null }); // Reset any error
+
+            // Set up a watcher
+            let watchID = null;
+            if (constants.MOCK_LOCATION) {
+                setPosition(mockLocation());
+                watchID = setInterval(
+                    () => setPosition(mockLocation()),
+                    constants.MOCK_LOCATION_UPDATE_INTERVAL,
+                );
+            } else {
+                if (!('geolocation' in navigator)) {
+                    this.$store.dispatch('setLocationError', { error: this.$t('geolocation.unavailable') });
+                    return;
+                }
+
+                watchID = navigator.geolocation.watchPosition(
+                    setPosition,
+                    handlePositionError,
+                    {
+                        enableHighAccuracy: true,
+                        maximumAge: 30000,
+                    },
+                );
+            }
+            this.$store.dispatch('setLocationWatcherId', { id: watchID });
+        },
+        onMapCenterUpdate(center) {
+            this.$store.dispatch('setCurrentMapCenter', { center });
+        },
+        onMapZoomUpdate(zoom) {
+            this.$store.dispatch('setCurrentMapZoom', { zoom });
+        },
+        resetReportLatLng() {
+            this.reportLatLng = null;
+        },
         setNoSleep() {
             if (this.$store.state.settings.preventSuspend) {
                 this.noSleep = new NoSleep();
@@ -179,34 +227,20 @@ export default {
         },
         showReportDialog(latlng) {
             if (latlng) {
-                this.reportLat = latlng.lat;
-                this.reportLng = latlng.lng;
+                this.reportLatLng = [latlng.lat, latlng.lng];
             } else {
-                this.reportLat = this.latLng[0];
-                this.reportLng = this.latLng[1];
+                this.reportLatLng = this.currentLatLng;
             }
-            this.dialog = !this.dialog;
-        },
-        hideReportDialogOnEsc(event) {
-            let isEscape = false;
-            if ('key' in event) {
-                isEscape = (event.key === 'Escape' || event.key === 'Esc');
-            } else {
-                isEscape = (event.keyCode === 27);
-            }
-            if (isEscape) {
-                this.dialog = false;
-            }
-        },
-        onManualLocationPicker(value) {
-            this.latLng = [value.latlng.lat, value.latlng.lng];
+            this.isReportDialogVisible = true;
         },
     },
     mounted() {
-        this.setNoSleep();
-        this.initializePositionWatching();
+        if (this.$route.name !== 'SharedMap') {
+            // Only enable NoSleep in normal map view (with position tracking).
+            this.setNoSleep();
+            this.initializePositionWatching();
+        }
         this.$store.dispatch('fetchReports');
-        window.addEventListener('keydown', this.hideReportDialogOnEsc);
     },
 };
 </script>