Polygon draw working

app/static/app/js/components/MapPreview.jsx

@@ -15,6 +15,11 @@ import exifr from '../vendor/exifr';
 import '../vendor/leaflet/leaflet-markers-canvas';
 import { _, interpolate } from '../classes/gettext';
 
+const Colors = {
+  fill: '#fff',
+  stroke: '#1a1a1a'
+};
+
 class MapPreview extends React.Component {
   static defaultProps = {
     getFiles: null
@@ -47,12 +52,15 @@ class MapPreview extends React.Component {
       maxZoom: 24
     });
 
+    this.group = L.layerGroup();
+    this.group.addTo(this.map);
+
     // For some reason, in production this class is not added (but we need it)
     // leaflet bug?
     $(this.container).addClass("leaflet-touch");
 
     //add zoom control with your options
-    let zoomControl = Leaflet.control.zoom({
+    Leaflet.control.zoom({
          position:'bottomleft'
     }).addTo(this.map);
 
@@ -241,11 +249,204 @@ _('Example:'),
     const { cropping } = this.state;
 
     let crop = !cropping;
-    if (!crop) this.cropButton.blur();
+    if (!crop) {
+      if (this.captureMarker) {
+        this.captureMarker.off('click', this.handleMarkerClick);
+        this.captureMarker.off('dblclick', this.handleMarkerDblClick);
+        this.captureMarker.off('mousemove', this.handleMarkerMove);
+        this.captureMarker.off('contextmenu', this.handleMarkerContextMenu);
+
+        this.map.off('move', this.onMapMove);
+        this.map.off('resize', this.onMapResize);
+
+        this.group.removeLayer(this.captureMarker);
+        this.captureMarker = null;
+      }
+
+      if (this.acceptMarker) {
+        this.group.removeLayer(this.acceptMarker);
+        this.acceptMarker = null;
+      }
+      if (this.measureBoundary) {
+        this.group.removeLayer(this.measureBoundary);
+        this.measureBoundary = null;
+      }
+      if (this.measureArea) {
+        this.group.removeLayer(this.measureArea);
+        this.measureArea = null;
+      }
+      this.cropButton.blur();
+    }
+    else{
+      if (!this.captureMarker) {
+        this.captureMarker = L.marker(this.map.getCenter(), {
+          clickable: true,
+          zIndexOffset: 10001
+        }).setIcon(L.divIcon({
+          iconSize: this.map.getSize().multiplyBy(2),
+          className: "map-preview-marker-layer"
+        })).addTo(this.group);
+
+        this.captureMarker.on('click', this.handleMarkerClick);
+        this.captureMarker.on('dblclick', this.handleMarkerDblClick);
+        this.captureMarker.on('mousemove', this.handleMarkerMove);
+        this.captureMarker.on('contextmenu', this.handleMarkerContextMenu);
+
+        this.map.on('move', this.onMapMove);
+        this.map.on('resize', this.onMapResize);
+      }
+
+      if (this.polygon){
+        this.group.removeLayer(this.polygon);
+        this.polygon = null;
+      }
+
+      // Reset latlngs
+      this.latlngs = [];
+    }
+
 
     this.setState({cropping: !cropping});
   }
 
+  handleMarkerClick = e => {
+    L.DomEvent.stop(e);
+
+    const latlng = this.map.mouseEventToLatLng(e.originalEvent);
+    this.uniqueLatLonPush(latlng);
+
+    if (this.latlngs.length >= 1) {
+      if (!this.measureBoundary) {
+        this.measureBoundary = L.polyline(this.latlngs.concat(latlng), {
+          clickable: false,
+          color: Colors.stroke,
+          weight: 2,
+          opacity: 0.9,
+          fill: false,
+        }).addTo(this.group);
+      } else {
+        this.measureBoundary.setLatLngs(this.latlngs.concat(latlng));
+      }
+    }
+
+    if (this.latlngs.length >= 2) {
+      if (!this.measureArea) {
+        this.measureArea = L.polygon(this.latlngs.concat(latlng), {
+          clickable: false,
+          stroke: false,
+          fillColor: Colors.fill,
+          fillOpacity: 0.2,
+        }).addTo(this.group);
+      } else {
+        this.measureArea.setLatLngs(this.latlngs.concat(latlng));
+      }
+    }
+
+    if (this.latlngs.length >= 3) {
+      if (this.acceptMarker) {
+        this.group.removeLayer(this.acceptMarker);
+        this.acceptMarker = null;
+      }
+
+      const onAccept = e => {
+        L.DomEvent.stop(e);
+        this.confirmPolygon();
+        return false;
+      };
+
+      let acceptLatlng = this.latlngs[0];
+
+      this.acceptMarker = L.marker(acceptLatlng, {
+        icon: L.icon({
+          iconUrl: `/static/app/img/accept.png`,
+          iconSize: [20, 20],
+          iconAnchor: [10, 10],
+          className: "map-preview-accept-button",
+        }),
+        zIndexOffset: 99999
+      }).addTo(this.group)
+        .on("click", onAccept)
+        .on("contextmenu", onAccept);
+    }
+  };
+
+  confirmPolygon = () => {
+    if (this.latlngs.length >= 3){
+      const popupContainer = L.DomUtil.create('div');
+      popupContainer.className = "map-preview-delete";
+      const deleteLink = L.DomUtil.create('a');
+      deleteLink.href = "javascript:void(0)";
+      deleteLink.innerHTML = `<i class="fa fa-trash"></i> ${_("Delete")}`;
+      deleteLink.onclick = (e) => {
+        L.DomEvent.stop(e);
+        if (this.polygon){
+          this.group.removeLayer(this.polygon);
+          this.polygon = null;
+        }
+      };
+      popupContainer.appendChild(deleteLink);
+
+      this.polygon = L.polygon(this.latlngs, {
+        clickable: true,
+        weight: 3,
+        opacity: 0.9,
+        color: "#ffa716",
+        fillColor: "#ffa716",
+        fillOpacity: 0.2
+      }).bindPopup(popupContainer).addTo(this.group);
+    }
+
+    this.toggleCrop();
+  }
+
+  uniqueLatLonPush = latlng => {
+    if (this.latlngs.length === 0) this.latlngs.push(latlng);
+    else{
+      const last = this.latlngs[this.latlngs.length - 1];
+      if (last.lat !== latlng.lat && last.lng !== latlng.lng) this.latlngs.push(latlng);
+    }
+  };
+
+  handleMarkerDblClick = e => {
+    if (this.latlngs.length >= 2){
+      const latlng = this.map.mouseEventToLatLng(e.originalEvent);
+      this.uniqueLatLonPush(latlng);
+      this.confirmPolygon();
+    }
+  }
+
+  handleMarkerMove = e => {
+    const latlng = this.map.mouseEventToLatLng(e.originalEvent);
+    let lls = this.latlngs.concat(latlng);
+    lls.push(lls[0]);
+    if (this.measureBoundary) {
+      this.measureBoundary.setLatLngs(lls);
+    }
+    if (this.measureArea) {
+      this.measureArea.setLatLngs(lls);
+    }
+  }
+
+  handleMarkerContextMenu = e => {
+    if (this.latlngs.length >= 2){
+      const latlng = this.map.mouseEventToLatLng(e.originalEvent);
+      this.uniqueLatLonPush(latlng);
+      this.confirmPolygon();
+    }
+
+    return false;
+  }
+
+  onMapMove = () => {
+    if (this.captureMarker) this.captureMarker.setLatLng(this.map.getCenter());
+  };
+
+  onMapResize = () => {
+    if (this.captureMarker) this.captureMarker.setIcon(L.divIcon({
+        iconSize: this._map.getSize().multiplyBy(2)
+      }));
+  }
+
   download = format => {
     let output = "";
     let filename = `images.${format}`;
@@ -288,7 +489,7 @@ _('Example:'),
 
         {this.state.error === "" ? 
             <div className="crop-control">
-              <button ref={(domNode) => {this.cropButton = domNode; }} type="button" onClick={this.toggleCrop} className={"btn btn-sm " + (this.state.cropping ? "btn-default" : "btn-secondary")} title={_("Set Crop Area (optional)")}>
+              <button ref={(domNode) => {this.cropButton = domNode; }} type="button" onClick={this.toggleCrop} className={"btn btn-sm " + (this.state.cropping ? "btn-default" : "btn-secondary")} title={_("Set Reconstruction Area (optional)")}>
               <i className="fa fa-crop-alt"></i>
             </button>
             </div>

app/static/app/js/css/MapPreview.scss

@@ -31,8 +31,25 @@
     }
 
     .leaflet-control-layers-expanded{
+        .leaflet-control-layers-base{
+            overflow: hidden;
+        }
         height: 200px;
         overflow: hidden;
     }
 
+    .map-preview-marker-layer{
+        &:hover{
+            cursor: crosshair;
+        }
+    }
+
+    .map-preview-accept-button{
+        &:hover{
+            cursor: pointer;
+        }
+    }
+    .map-preview-delete{
+        min-width: 70px;
+    }
 }