[gnome-maps] Mapview: Add support for showing routes

[Mattias Bengtsson <mattiasb src gnome org>]

commit d90af211b6c87d2b53f2369c024e493b7d746b12
Author: Mattias Bengtsson <mattias jc bengtsson gmail com>
Date:   Tue Apr 22 04:58:38 2014 +0200

    Mapview: Add support for showing routes
    
    Connect to the route model and when it changes also update the map.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=728695

 src/mapView.js |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)
---
diff --git a/src/mapView.js b/src/mapView.js
index 3ca3a50..19a6f39 100644
--- a/src/mapView.js
+++ b/src/mapView.js
@@ -72,6 +72,10 @@ const MapView = new Lang.Class({
         // Don't show sidebar until it has something in it
         //this.view.add_child(this._sidebar.actor);
 
+        this._routeLayer = new Champlain.PathLayer();
+        this._routeLayer.set_stroke_width(2.0);
+        this.view.add_layer(this._routeLayer);
+
         this._markerLayer = new Champlain.MarkerLayer();
         this._markerLayer.set_selection_mode(Champlain.SelectionMode.SINGLE);
         this.view.add_layer(this._markerLayer);
@@ -95,6 +99,13 @@ const MapView = new Lang.Class({
         this._updateUserLocation();
         this.geoclue.connect("location-changed",
                              this._updateUserLocation.bind(this));
+
+        this._connectRouteSignals(Application.routeService.route);
+    },
+
+    _connectRouteSignals: function(route) {
+        route.connect('update', this.showRoute.bind(this, route));
+        route.connect('reset', this._routeLayer.remove_all.bind(this._routeLayer));
     },
 
     setMapType: function(mapType) {
@@ -187,6 +198,28 @@ const MapView = new Lang.Class({
         mapLocation.goTo(true);
     },
 
+    showRoute: function(route) {
+        this._routeLayer.remove_all();
+
+        route.path.forEach(this._routeLayer.add_node.bind(this._routeLayer));
+
+        // Animate to the center of the route bounding box
+        // goto() is currently implemented on mapLocation, so we need to go
+        // through some hoops here.
+        let [lat, lon] = route.bbox.get_center();
+        let place = new Geocode.Place({
+            location     : new Geocode.Location({ latitude  : lat,
+                                                  longitude : lon }),
+            bounding_box : new Geocode.BoundingBox({ top    : route.bbox.top,
+                                                     bottom : route.bbox.bottom,
+                                                     left   : route.bbox.left,
+                                                     right  : route.bbox.right })
+        });
+        let mapLocation = new MapLocation.MapLocation(place, this);
+
+        mapLocation.goTo(true);
+    },
+
     _onViewMoved: function() {
         this.emit('view-moved');
     }