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/* -*- Mode: JS2; indent-tabs-mode: nil; js2-basic-offset: 4 -*- */
/* vim: set et ts=4 sw=4: */
/*
* Copyright (c) 2011, 2012, 2013 Red Hat, Inc.
* Copyright (c) 2014 Damián Nohales
*
* GNOME Maps is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* GNOME Maps is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with GNOME Maps; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
* Damián Nohales <damiannohales@gmail.com>
*/
const Clutter = imports.gi.Clutter;
const Geocode = imports.gi.GeocodeGlib;
const GObject = imports.gi.GObject;
const BoundingBox = imports.boundingBox;
const Location = imports.location;
const Utils = imports.utils;
const _MAX_DISTANCE = 19850; // half of Earth's circumference (km)
const _MIN_ANIMATION_DURATION = 2000; // msec
const _MAX_ANIMATION_DURATION = 5000; // msec
var MapWalker = GObject.registerClass({
Signals: {
'gone-to': { }
}
}, class MapWalker extends GObject.Object {
_init(place, mapView) {
this.place = place;
this._mapView = mapView;
this._view = mapView.view;
this._boundingBox = this._createBoundingBox(this.place);
super._init();
}
_createBoundingBox(place) {
if (place.bounding_box !== null) {
return new BoundingBox.BoundingBox({ top: place.bounding_box.top,
bottom: place.bounding_box.bottom,
left: place.bounding_box.left,
right: place.bounding_box.right });
} else {
return null;
}
}
// Zoom to the maximal zoom-level that fits the place type
zoomToFit() {
let zoom;
if (this._boundingBox !== null && this._boundingBox.isValid()) {
zoom = this._mapView.getZoomLevelFittingBBox(this._boundingBox);
} else if (this.place.initialZoom) {
zoom = this.place.initialZoom;
} else {
switch (this.place.place_type) {
case Geocode.PlaceType.STREET:
zoom = 16;
break;
case Geocode.PlaceType.TOWN:
zoom = 11;
break;
case Geocode.PlaceType.COUNTRY:
zoom = 6;
break;
default:
zoom = this._view.max_zoom_level;
break;
}
}
this._view.zoom_level = zoom;
this._view.center_on(this.place.location.latitude,
this.place.location.longitude);
}
goTo(animate, linear) {
Utils.debug('Going to ' + [this.place.name,
this.place.location.latitude,
this.place.location.longitude].join(' '));
this._mapView.emit('going-to');
if (!animate) {
this._view.center_on(this.place.location.latitude,
this.place.location.longitude);
this.emit('gone-to');
return;
}
let fromLocation = new Location.Location({ latitude: this._view.get_center_latitude(),
longitude: this._view.get_center_longitude() });
this._updateGoToDuration(fromLocation);
if (linear) {
this._view.goto_animation_mode = Clutter.AnimationMode.LINEAR;
Utils.once(this._view, 'animation-completed',
this.zoomToFit.bind(this));
this._view.go_to(this.place.location.latitude,
this.place.location.longitude);
} else {
/* Lets first ensure that both current and destination location are visible
* before we start the animated journey towards destination itself. We do this
* to create the zoom-out-then-zoom-in effect that many map implementations
* do. This not only makes the go-to animation look a lot better visually but
* also give user a good idea of where the destination is compared to current
* location.
*/
this._view.goto_animation_mode = Clutter.AnimationMode.EASE_IN_CUBIC;
this._ensureVisible(fromLocation);
Utils.once(this._view, 'animation-completed', () => {
this._view.goto_animation_mode = Clutter.AnimationMode.EASE_OUT_CUBIC;
this._view.go_to(this.place.location.latitude,
this.place.location.longitude);
Utils.once(this._view, 'animation-completed::go-to', () => {
this.zoomToFit();
this._view.goto_animation_mode = Clutter.AnimationMode.EASE_IN_OUT_CUBIC;
this.emit('gone-to');
});
});
}
}
_ensureVisible(fromLocation) {
let visibleBox = null;
if (this._boundingBox !== null && this._boundingBox.isValid()) {
visibleBox = this._boundingBox.copy();
visibleBox.extend(fromLocation.latitude, fromLocation.longitude);
} else {
visibleBox = new BoundingBox.BoundingBox({ left: 180,
right: -180,
bottom: 90,
top: -90 });
[fromLocation, this.place.location].forEach((location) => {
visibleBox.left = Math.min(visibleBox.left, location.longitude);
visibleBox.right = Math.max(visibleBox.right, location.longitude);
visibleBox.bottom = Math.min(visibleBox.bottom, location.latitude);
visibleBox.top = Math.max(visibleBox.top, location.latitude);
});
}
let [lon, lat] = visibleBox.getCenter();
this._view.zoom_level = this._mapView.getZoomLevelFittingBBox(visibleBox);
this._view.go_to(lat, lon);
}
_boxCovers(coverBox) {
if (this._boundingBox === null)
return false;
if (coverBox.left > this._boundingBox.left)
return false;
if (coverBox.right < this._boundingBox.right)
return false;
if (coverBox.top < this._boundingBox.top)
return false;
if (coverBox.bottom > this._boundingBox.bottom)
return false;
return true;
}
_updateGoToDuration(fromLocation) {
let toLocation = this.place.location;
let distance = fromLocation.get_distance_from(toLocation);
let duration = (distance / _MAX_DISTANCE) * _MAX_ANIMATION_DURATION;
// Clamp duration
duration = Math.max(_MIN_ANIMATION_DURATION,
Math.min(duration, _MAX_ANIMATION_DURATION));
// We divide by two because Champlain treats both go_to and
// ensure_visible as 'goto' journeys with its own duration.
this._view.goto_animation_duration = duration / 2;
}
});
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