CruisersWiki:Ol3chartlet.js

From CruisersWiki

(Difference between revisions)
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(expandUrls removed)
(Navionics urls)
Line 7: Line 7:
*/
*/
-
Promise.all( [
+
loadCss( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.css' )
-
    // use debug version, to allow patch below
+
 
-
    loadJs( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.js' ),
+
loadJs( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.js' ) // use debug version, to allow patch below
-
    loadCss( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.css' )
+
-
])
+
.then( function () {
.then( function () {
     // try to recover from /extensions/TreeAndMenu/dtree.js overwriting Node
     // try to recover from /extensions/TreeAndMenu/dtree.js overwriting Node
Line 31: Line 29:
         KEY: 'Navionics_webapi_00572',
         KEY: 'Navionics_webapi_00572',
         DOMAIN: 'www.cruiserswiki.org',
         DOMAIN: 'www.cruiserswiki.org',
-
         BASE_TILE_SERVER: 'https://tile{1-5}.navionics.com',
+
         TILE_URL: 'https://tile{1-5}.navionics.com/tile/{z}/{x}/{y}',
-
        TILE_SUFFIX: '/tile/{z}/{x}/{y}',
+
         TOKEN_URL: 'https://tile1.navionics.com/tile/get_key',
-
         KEY_REQ_SUFFIX: '/tile/get_key',
+
         MAX_RESOLUTION: 20480,
         MAX_RESOLUTION: 20480,
         MIN_RESOLUTION: 0.625,
         MIN_RESOLUTION: 0.625,
Line 64: Line 61:
         if ( Navionics.token != null )
         if ( Navionics.token != null )
             return Navionics.token
             return Navionics.token
-
         var url = Navionics.BASE_TILE_SERVER.replace( /\{(.-.)\}/, '1') + Navionics.KEY_REQ_SUFFIX + '/' + Navionics.KEY + '/' + Navionics.DOMAIN
+
         var url = Navionics.TOKEN_URL + '/' + Navionics.KEY + '/' + Navionics.DOMAIN
         return Navionics.token = Promise.resolve( $.ajax({
         return Navionics.token = Promise.resolve( $.ajax({
                 url: url,
                 url: url,
Line 111: Line 108:
             navtoken: options.token
             navtoken: options.token
         })
         })
-
         return Navionics.BASE_TILE_SERVER + Navionics.TILE_SUFFIX + '?' + params  
+
         return Navionics.TILE_URL + '?' + params  
     }
     }

Revision as of 09:18, 15 January 2020

//
/*
   ol3Chartlet.js

   Copyright (c) 2016 Vadim Shlyakhov
   Licensed MIT
*/

loadCss( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.css' )

loadJs( 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.5.0/ol-debug.js' ) // use debug version, to allow patch below
.then( function () {
    // try to recover from /extensions/TreeAndMenu/dtree.js overwriting Node
    if (Node.ELEMENT_NODE === undefined) {
        if (document.firstElementChild.__proto__.ELEMENT_NODE == 1) {
            Node = document.firstElementChild.__proto__;
        } else {
            Node.ELEMENT_NODE = 1
        }
        ol.xml.isNode = function(value) {
            //   return value instanceof Node;
            return typeof value.nodeName === "string";
        };
    }
})
.then( function () {
    var Navionics = {
        token: null,
        KEY: 'Navionics_webapi_00572',
        DOMAIN: 'www.cruiserswiki.org',
        TILE_URL: 'https://tile{1-5}.navionics.com/tile/{z}/{x}/{y}',
        TOKEN_URL: 'https://tile1.navionics.com/tile/get_key',
        MAX_RESOLUTION: 20480,
        MIN_RESOLUTION: 0.625,

        disclaimer_msg: '', //'<b>© Navionics</b> <a href="http://www.navionics.com/en/acknowledgements" target="_new" class="navionics-acknowledgements">Acknowledgements</a> | Not to be used for navigation',
        depthUnits: {
            'm': 1, 'metre': 1, 'meter': 1,
            'ft': 2, 'feet': 2,
            'fathom': 3,
        },

        attribution: [
            '<div class="navionics-attribution navionics-off">',
                '<a class="navionics-logo" href="http://www.navionics.com/" target="_blank">',
                    '<span></span>',
                '</a>',
                '<div class="navionics-acknowledgements">',
                    '<div>',
                        '<a href="http://www.navionics.com/en/acknowledgements" target="_blank">',
                            'Acknowledgements',
                        '</a>',
                        '<span> | Not to be used for navigation</span>',
                    '</div>',
                '</div>',
            '</div>'
        ].join(''),
    }

    Navionics.getToken = function () {
        if ( Navionics.token != null )
            return Navionics.token
        var url = Navionics.TOKEN_URL  + '/' + Navionics.KEY + '/' + Navionics.DOMAIN
        return Navionics.token = Promise.resolve( $.ajax({
                url: url,
                crossDomain: true,
                dataType: 'text',
                //cache: false,
            })
        )
    }

    Navionics.source = function ( options ) {
        options = options || {}
        var sourceOptions = {
            crossOrigin: 'anonymous',
            maxResolution: Navionics.MAX_RESOLUTION,
            minResolution: Navionics.MIN_RESOLUTION
        }
        ol.source.XYZ.call( this, sourceOptions )

        var self = this
        Navionics.getToken()
        .then( function ( token ) {
            options.token = token
            var url = Navionics.getTileUrl( options )
            self.setUrl( url )
        })
        .catch( function( err ) {
          return console.log( 'Navionics.getToken', err )
        })
    }

    ol.inherits( Navionics.source, ol.source.XYZ )

    Navionics.getTileUrl = function ( options ) { // sonar, overlay, depthUnit, safeDepth, showUGC
        options = options || {}
        var layerConfig = [
            'config',
            Navionics.depthUnits[ options.depthUnit ] || 1,
            ( options.safeDepth || 20 ).toFixed( 2 ),
            options.sonar ? 1 : 0
        ]
        params = $.param({
            LAYERS: layerConfig.join('_'),
            TRANSPARENT: !! options.transparency,
            UGC: !! options.showUGC,
            navtoken: options.token
        })
        return Navionics.TILE_URL + '?' + params 
    }

    Navionics.monitorAttribution = function ( map ) {
        var layers = []

        function checkLayer ( l ) {
            if ( l  instanceof ol.layer.Group ) {
                checkLayer( l )
            } else {
                var title = l.get( 'title' )
                if ( title && title.indexOf( 'Navionics' ) != -1 ) {
                    layers.push( l )
                }
            }
        }
        map.getLayers().forEach( checkLayer ) 
        
        if ( layers.length == 0 )
            return
        var attribution = $( Navionics.attribution )
        var control = new ol.control.Control({ element: attribution.get( 0 ) })
        map.addControl( control )

        function attributionVisibility ( evt ) {
            // console.log( 'change:visible', evt )
            var visible = this.getVisible()
            attribution.toggleClass( 'navionics-off', ! visible )
        }

        for ( var i=0, li=layers.length; i < li; i++ ) {
            var layer = layers[ i ]
            layer.on( 'change', attributionVisibility.bind( layer ))
            layer.on( 'change:visible', attributionVisibility.bind( layer ))
        }
    }

    var Esri = {
        uri_map: {
            'satellite': "http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer",
            'topo': "http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer",
            'terrain': 'http://server.arcgisonline.com/arcgis/rest/services/World_Terrain_Base/MapServer',
            'physical': 'http://services.arcgisonline.com/ArcGIS/rest/services/World_Physical_Map/MapServer',
            'relief': 'http://server.arcgisonline.com/arcgis/rest/services/World_Shaded_Relief/MapServer',
            'light-gray': "http://services.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Reference/MapServer",
            'dark-gray': "http://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Base/MapServer",
            'street': "http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer",
            'places': "http://services.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places/MapServer",
            'oceans-reference': "http://server.arcgisonline.com/arcgis/rest/services/Ocean/World_Ocean_Reference/MapServer",
            'oceans': 'http://server.arcgisonline.com/arcgis/rest/services/Ocean_Basemap/MapServer',
            'national-geographic': "http://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer",
            'transportation': "https://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Transportation/MapServer"
        },
    }
/*
    Esri.source = function ( id ) {
        ol.source.TileArcGISRest.call( this, {
            url: Esri.uri_map[ id ],
            params: {
                FORMAT: 'JPG',
                TRANSPARENT: false,
            },
            attributions: [
                new ol.Attribution({
                    html: 'Tiles by ESRI <a href="' + Esri.uri_map[ id ] + '">Acknowledgements</a>'
                })
            ]
        })
    };

    ol.inherits( Esri.source, ol.source.TileArcGISRest )
*/
    Esri.source = function ( id ) {
        ol.source.XYZ.call( this, {
            url: Esri.uri_map[ id ] + '/tile/{z}/{y}/{x}',
            crossOrigin: null,
            attributions: [
                new ol.Attribution({
                    html: 'Tiles by ESRI <a href="' + Esri.uri_map[ id ] + '">Acknowledgements</a>'
                })
            ],
        })
    };

    ol.inherits( Esri.source, ol.source.XYZ )

    function ol3Chartlet( chartlet_div, standalone ) {
        this.styleLoadHooks = [];

        console.log('ol3Chartlet');

        this.params = parseParams(
            standalone && location.hash
            ? decodeURI( location.hash.slice( 1 ))
            : $( chartlet_div ).text()
        )
        this.params.standalone = standalone
        
        var layers = this.createLayers()

        var map = this.map = new ol.Map({
            target: chartlet_div,
            layers: layers,
            view: new ol.View({
                center: ol.proj.transform([this.params.lon, this.params.lat], 'EPSG:4326', 'EPSG:3857'),
                zoom: this.params.zoom
            }),
            interactions: ol.interaction.defaults(
                standalone ? {}
                : {
                    mouseWheelZoom:false,
                    // doubleClickZoom :false,
                }
            ),
            controls: ol.control.defaults({
                attributionOptions: /** @type {olx.control.AttributionOptions} */ {
                    collapsible: false
                }
            }).extend([
                new ol.control.FullScreen(),
                new ol.control.ScaleLine({
                    units: 'nautical'
                })
            ])
        });

        this.restoreVisibility()

        Navionics.monitorAttribution( map )

        // loadWikiCss( 'CruisersWiki:Ol3-layerswitcher.css' )
        // loadWikiJs( 'CruisersWiki:Ol3-layerswitcher.js')
        loadCss( 'https://cdn.jsdelivr.net/gh/walkermatt/ol3-layerswitcher@1.1.2/src/ol3-layerswitcher.css' )
        loadJs( 'https://cdn.jsdelivr.net/gh/walkermatt/ol3-layerswitcher@1.1.2/src/ol3-layerswitcher.js' )
        .then( function () {
            var layerSwitcher = new ol.control.LayerSwitcher({
                // tipLabel: 'Legend' // Optional label for button
            });
            map.addControl(layerSwitcher);
        })

        if (standalone) {
            this.params.page && this.addPoiLayer();
            this.trackHash();
            this.addGraticule();
            this.addCentreControl( map );

        } else if (this.params.pageFeatures) {
            this.addPoiLayer();
        }

        this.addStoreVisibilityToolstoreVisibilitystoreVisibility()
    };

    ol3Chartlet.prototype.createLayers = function () {
        var layerDefs = [
            // overlays
            [ 'o', 's', '', 'Navionics Boating', new Navionics.source({ transparency: true }) ],
            [ 'o', '', '', 'ESRI Transportation', new Esri.source( 'transportation' ) ],
            [ 'o', '', 'i', 'ESRI Boundaries and Places', new Esri.source( 'places' ) ],
            [ 'o', '', 'i', 'OpenSeaMap', new ol.source.XYZ({
                        url: 'http://t1.openseamap.org/seamark/{z}/{x}/{y}.png',
                        crossOrigin: null,
                        attributions: [
                            new ol.Attribution({
                                html: 'Tiles by <a href="http://www.openseamap.org">OpenSeaMap</a>'
                            })
                        ],
                    })
            ],
            // baselayers
            [ '-b', '', '', 'Navionics', new Navionics.source() ],
            [ 'b', 's', '', 'Water color', new ol.source.Stamen({
                        layer: 'watercolor',
                        //~ url: 'http://tile.stamen.com/watercolor/{z}/{x}/{y}.jpg'
                        //~ url: 'https://stamen-tiles-{a-d}.a.ssl.fastly.net/watercolor/{z}/{x}/{y}.jpg'
                    })
            ],
            [ 'b', '', '', 'OpenStreetMap',  new ol.source.OSM() ],
            [ 'b', '', 'i', 'ESRI World Imagery',  new Esri.source( 'satellite' ) ],
            [ '-b', '', '', 'ESRI World Street Map', new Esri.source( 'street' ) ],
            [ '-b', '', '', 'OSM base', new ol.source.OSM({
                        crossOrigin: null,
                        url: 'http://{a-c}.tiles.wmflabs.org/osm-no-labels/{z}/{x}/{y}.png'
                    })
            ],
            [ '-b', '', '', new ol.layer.Vector({
                    title: 'No background',
                    source: new ol.source.Vector({})
            })],
        ]
        
        var baseLayers = []
        var overlays = []

        for (var i = 0; i < layerDefs.length; i++) {
            var row = layerDefs[ i ]
            var title = row[ 3 ]
            var l = typeof title != 'string' ? title : new ol.layer.Tile({
                title: title,
                source: row[ 4 ]
            })

            l.set( 'visible', this.params.standalone ? row[ 1 ] == 's' : row[ 2 ] == 'i' )
            switch ( row[ 0 ] ) { 
                case 'b':
                    l.set( 'type' , 'base' )
                    baseLayers.push( l )
                    break
                case 'o': 
                    overlays.push( l )
            }
        }
/*
        var layers = [
            new ol.layer.Group({
                title: 'Base maps',
                layers: baseLayers
            }),
            new ol.layer.Group({
                    title: 'Layers',
                    layers: overlays
            })
        ]
*/
        var layers = baseLayers.concat( overlays )
        return layers
    }
    
    ol3Chartlet.prototype.addCentreControl = function ( map ) {
        var elem = $( '<div class="chartlet-centre"></div>' ).get( 0 )
        var control = new ol.control.Control({ element: elem })
        map.addControl( control )
    }

    // add to a layer group
    ol3Chartlet.prototype.addNonBaseLayer = function (new_layer) {
        this.map.getLayers().push( new_layer )
/*
        this.map.getLayers().forEach(
            function(layer) {
                if (layer.get('title') === overlaysGroupName) {
                    layer.getLayers().push(new_layer);
                }
            }
        )
*/
    }

    ol3Chartlet.prototype.trackHash = function() {
        var doNotTrackHash = false;
        var setHashTimeoutID = null;

        var view = this.map.getView();
        var params = this.params;

        var onChangeCenterZoom = function () {
            var setHashDelay = 1000;

            var setHash = function () {
                var centre = view.getCenter();
                var lonlat = ol.proj.transform(centre, view.getProjection(), 'EPSG:4326');

                doNotTrackHash = true;
                setHashTimeoutID = null;

                params.lon = lonlat[0];
                params.lat = lonlat[1];
                params.zoom = view.getZoom();
                //console.log(center, zoom);

                location.hash = 'lat=' + round(params.lat) + '|lon=' + round(params.lon)
                    + '|zoom=' + params.zoom
                    + (params.layer ? '|layer=' + params.layer : '')
                    + (params.page ? '|page=' + params.page : '');
            };

            if (setHashTimeoutID) {
                window.clearTimeout(setHashTimeoutID);
            }
            setHashTimeoutID = window.setTimeout(setHash, setHashDelay);
        }

        view.on('change:center', onChangeCenterZoom);
        view.on('change:resolution', onChangeCenterZoom);

        window.addEventListener('hashchange',  function () {
            if (!location.hash || doNotTrackHash) {
                doNotTrackHash = false;
                return;
            }
            params = parseParams(location.hash.slice(1));
            if (params.lat != null && params.lon != null) {
                var centre = [params.lon, params.lat];
                view.setCenter(ol.proj.transform(centre, 'EPSG:4326', view.getProjection()))
                view.setZoom(params.zoom);
            }
        })
    }

    // Create the graticule
    ol3Chartlet.prototype.addGraticule = function () { // after http://map.openseamap.org/javascript/grid_wgs.js
        var this_ = this;
        loadWikiJs( 'CruisersWiki:Ol3chartlet-graticule.js' )
        .then( function () {
            var layer = graticuleLayer(this_.map);
            this_.addNonBaseLayer(layer);
        })
        /*
        var graticule = new ol.Graticule({
            map: this.map,
            // the style to use for the lines, optional.
            strokeStyle: new ol.style.Stroke({
                color: 'rgba(255,120,0,0.9)',
                width: 2,
                lineDash: [0.5, 4]
            })
        });
        // graticule.setMap(this.map);
        */
    };

    ol3Chartlet.prototype.addPoiLayer = function () {
        var options = $.extend({}, this.params);

        var loader = function(extent, resolution, projection) {
            /**
            * @param {ol.Extent} extent Extent.
            * @param {number} resolution Resolution.
            * @param {ol.proj.Projection} projection Projection.
            * @this {ol.source.Vector|ol.VectorTile}
            */
            options.projection = projection;
            options.addFeature = addFeature;

            loadWikiJs(
                $('.chartlet-test').length == 0 ? 'CruisersWiki:Ol3chartlet-features.js' : 'CruisersWiki:Ol3chartlet-features-test.js'
            )
            .then( function () {
                loadFeatures(options);
            })
        };

        var source = new ol.source.Vector({
            loader: loader,
        });

        var layer = new ol.layer.Vector({
            title: 'POI',
            visible: true,
            style: styleFunction,
            source: source,
        });

        var this_ = this;

        var defferedFeatures = [];
        function addFeature (feature) {
            if (!this_.styles) {
                defferedFeatures.push(feature);
                return;
            }
            if (defferedFeatures) {
                source.addFeatures(defferedFeatures);
                defferedFeatures = null;
            }
            if (feature) {
                source.addFeature(feature);
            }
        };

        this.styleLoadHooks.push(addFeature);

        function styleFunction (feature, resolution) {
            var category = feature.get('category') || 'other';
            var geom = feature.getGeometry();
            var style;
            if (geom.getType() == 'Point') {
                var styleOptions = {
                    //zIndex: 2
                };
                options.icons && (styleOptions.image = this_.getStyle(category, 'Icon'));
                options.captions && (styleOptions.text = this_.getTextStyle(category, feature.get('name')));
                style = new ol.style.Style(styleOptions);
            } else {
                style = new ol.style.Style({
                    fill: this_.getStyle(category, 'Fill'),
                    stroke: this_.getStyle(category, 'Stroke'),
                });
            }
            return style;
        };

        this.addNonBaseLayer(layer);

//        loadWikiCss('CruisersWiki:tOl3-popup.css');
//        loadWikiJs( 'CruisersWiki:tOl3-popup.js' )
        loadCss( 'https://cdn.jsdelivr.net/gh/walkermatt/ol3-popup@1.0.3/src/ol3-popup.css' );
        loadJs( 'https://cdn.jsdelivr.net/gh/walkermatt/ol3-popup@1.0.3/src/ol3-popup.js' )
        .then( this.initPopups.bind( this ))

        this.trackPointer();
        this.highlightFeatures();
        this.loadStyles();
    };

    ol3Chartlet.prototype.styles = null;
    ol3Chartlet.prototype.styleLoadHooks = null;

    ol3Chartlet.prototype.loadStyles = function () {
        var this_ = this;
        loadWikiJs(
            $('.chartlet-test').length == 0 ? 'CruisersWiki:Ol3chartlet-styles.js' : 'CruisersWiki:Ol3chartlet-styles-test.js'
        )
        .then( function () { return loadStyles() })
        .then( function (styles) {
            this_.styles = styles;
            var hooks = this_.styleLoadHooks;
            this_.styleLoadHooks = [];
            hooks.map( function(fn) { fn() });
        });
    };

    ol3Chartlet.prototype.getStyle = function (category, subType) {
        var style = this.styles[category + '.' + subType];
        return style ? style : this.styles['default'  + '.' + subType];
    }

    ol3Chartlet.prototype.getTextStyle = function (category, text) {
        var style = this.getStyle(category, 'Text').clone();
        style.setText(text);
        return style;
    }

    ol3Chartlet.prototype.isClickableLayer = function (layer) {
        return ! layer.get('noclickable');
    };

    ol3Chartlet.prototype.initPopups = function () {
        var map = this.map;
        var popup = new ol.Overlay.Popup();
        map.addOverlay(popup);

        var popTemplate =
            '<div class="cw-popup-name"><a href="{href}" target="_blank">{name}</a></div>\n' +
            '<div class="cw-popup-category">{category}</div>\n' +
            '<div class="cw-popup-content">{content}</div>';

        // display popup on click
        map.on('click', function(evt) {
            var feature = map.forEachFeatureAtPixel(
                evt.pixel,
                function(feature, layer) {
                  return feature;
                },
                { layerFilter: this.isClickableLayer }
            );
            if (feature && ! feature.get('noclickable')) {
                var data = {
                    href: feature.get("url"),
                    name: feature.get("name"),
                    category: feature.get("category"),
                    content: feature.get("description"),
                };
                popup.show(evt.coordinate, format(popTemplate, data));
            } else {
                popup.hide();
            }
        });
    };

    ol3Chartlet.prototype.trackPointer = function () {
        // change mouse cursor when over marker
        var map = this.map;
        map.on('pointermove', function(e) {
            //~ if (e.dragging) {
              //~ $(element).popover('destroy');
              //~ return;
            //~ }
            var pixel = map.getEventPixel(e.originalEvent);
            var hit = map.hasFeatureAtPixel(pixel, this.isClickableLayer);
            map.getTarget().style.cursor = hit ? 'pointer' : '';
        });
    };

    ol3Chartlet.prototype.highlightFeatures = function () {
        var map = this.map;
        var highlightStyle;
        this.styleLoadHooks.push(function () {
            highlightStyle = new ol.style.Style({
                fill: this.getStyle('highlight', 'Fill'),
                stroke: this.getStyle('highlight', 'Stroke'),
            });
        }.bind(this));

        function styleFunction (feature, resolution) {
            var geom = feature.getGeometry();
            if (geom.getType() != 'Point') {
                return highlightStyle;
            }
        }

        var highlightOverlay = new ol.layer.Vector({
            source: new ol.source.Vector(),
            map: map,
            style: styleFunction
        });
        highlightOverlay.set('noclickable', true);

        var highlight;

        var highlightFeature = function(evt) {
            if (evt.dragging) {
                return;
            }
            var pixel = map.getEventPixel(evt.originalEvent);

            var feature = map.forEachFeatureAtPixel(pixel, function(feature) {
                return feature;
            });

            if (feature !== highlight) {
                if (highlight) {
                    highlightOverlay.getSource().removeFeature(highlight);
                }
                if (feature) {
                    highlightOverlay.getSource().addFeature(feature);
                }
                highlight = feature;
            }
        };

        map.on('pointermove', highlightFeature);
    };


    ol3Chartlet.prototype.addStoreVisibilityToolstoreVisibilitystoreVisibility = function () {
        if ( $( '#cw-save-layers' ).length > 0 )
            return
        var $a = $( '<a id="cw-save-layers" style="cursor:pointer">Save layers</a>' )
            .click( this.storeVisibility.bind( this ))

        $( '#p-tb ul' ).append( $( '<li>' ).append( $a ))
    }

    ol3Chartlet.prototype.walkLayers = function ( group, action ) {
        var items = group.getLayers().getArray()
        for ( var i=0, li=items.length; i < li; i++ ) {
            var item = items[ i ]
            if ( item instanceof ol.layer.Group  ) {
                this.walkLayers( item, action )
                continue
            }
            action( item )
        }
    }

    ol3Chartlet.prototype.storeVisibility = function () {
        var standalone = this.params.standalone
        var visibility = Storage.get( 'cw-layers-visibility' )
        
        if ( ! visibility || ! visibility[ standalone ] )
            visibility = {
                true: {},
                false: {},
            }

        function getVisibility ( layer ) {
            var name = layer.get( 'title' )
            visibility[ standalone ][ name ] = layer.getVisible()
        }

        this.walkLayers( this.map, getVisibility )

        Storage.set( 'cw-layers-visibility', visibility )
    }

    ol3Chartlet.prototype.restoreVisibility = function () {
        var standalone = this.params.standalone
        var visibility = Storage.get( 'cw-layers-visibility' )
        if ( ! visibility || ! visibility[ standalone ] )
            return

        function setVisibility ( layer ) {
            var name = layer.get( 'title' )
            var isVisible = visibility[ standalone ][ name ]
            if ( isVisible != null )
                layer.setVisible( isVisible )
        }

        this.walkLayers( this.map, setVisibility )
    }

    function dmsh2deg( dmsh ) {
        var dmsFactors = [ 1, 60, 3600 ]
        var deg = 0
        if ( ! dmsh )
            return deg

        var parts = dmsh.split( '_' )
        for ( var i=0, li = parts.length; i < li; i++ ) {
            var p = parts[ i ]
            if ( isNaN(+ p) ) {
                if (p == 'S' || p == 's' || p == 'W' || p == 'w')
                    deg = -deg
                break
            } else {
                deg += p / dmsFactors[i]
            }
        }
        return deg
    }

    var zoomDelta = 0; // -3; // adjust zoom levels

    function parseParams(param_str) {
        var out = {
            icons: true,
            //recursive: 1,
            //childrenlocations: true,
            //captions: true,
        };

        var params = param_str.split('|');
        for (var i=0, li = params.length; i < li; i++) {
            var keyVal = params[i].split('=', 2);
            var key = $.trim(keyVal[0] || '').toLowerCase();
            var val = $.trim(keyVal[1] || '');
            if (key == 'lon') {
                out.lon = dmsh2deg(val);
            } else if (key == 'lat') {
                out.lat = dmsh2deg(val);
            } else if (key == 'zoom') {
                out.zoom = +(val || 12) + zoomDelta;
            } else if (key == 'layer') {
                out.layer = val || 'N';
            } else if (key == 'page') {
                out.page = val;
            } else if (key == 'pagefeatures') {
                out.pageFeatures = !!val;
            } else if (key == 'captions') {
                out.captions = !!val;
            } else if (key == 'childrenlocations') {
                out.childrenlocations = true;
                out.recursive = 1;
            } else if (key == 'recursive') {
                out.recursive = val;
            } else if (key == 'icons') {
                out.icons = !!val;
            } else if (key == 'nopagelocation') {
                out.nopagelocation = !!val;
            }
        }
        return out;
    }

    function round(val) {
        var fact = 100000;
        return Math.round(val * fact) / fact;
    }

    function chartlet() {
        var $chartlets = $('.chartlet');
        if ($chartlets.length === 0) {
            return;
        }

        var standalone_div = $('.chartlet-standalone')[0];

        // if (standalone && location.hash) {
        //     $('body').empty().append(standalone_div);
        //     $('body').addClass('cw-chartlet-extend');
        // }

        // fill in to a full window if URL hash is set
        if (standalone_div && location.hash) {
            var body = document.body;
            $('body').addClass('chartlet-extend');
            while (body.firstChild) {
                body.removeChild(body.firstChild);
            }
            body.appendChild(standalone_div);

            setImmediate(function() {
                new ol3Chartlet( standalone_div, true );
            });
        } else {
            $chartlets.each( function () {
                new ol3Chartlet( this, !! standalone_div );
            });
        }
    };

    chartlet()

})
;
// 
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