js/syp.js

   1 /* Copyright (c) 2009 Arnaud Renevier, Inc, published under the modified BSD
   2  * license. */
   3
   4 OpenLayers.Control.SypAttribution = OpenLayers.Class (OpenLayers.Control.Attribution, {
   5     updateAttribution: function() {
   6         var attributions = [SypStrings.propulsedByLink];
   7         if (this.map && this.map.layers) {
   8             for(var i=0, len=this.map.layers.length; i<len; i++) {
   9                 var layer = this.map.layers[i];
  10                 if (layer.attribution && layer.getVisibility()) {
  11                     attributions.push( layer.attribution );
  12                 }
  13             }
  14             this.div.innerHTML = attributions.join(this.separator);
  15         }
  16     }
  17 });
  18
  19 var SYP = {
  20     Markers: {
  21         ICON: "media/marker-normal.png",
  22         SELECT_ICON: "media/marker-selected.png",
  23         HEIGHT: 25
  24     },
  25
  26     map: null,
  27     baseLayer: null,
  28     dataLayer: null,
  29     selectControl: null,
  30
  31     init: function() {
  32         this.map = new OpenLayers.Map("map", {
  33             controls:[
  34                 new OpenLayers.Control.SypAttribution(),
  35                 new OpenLayers.Control.Navigation(),
  36                 new OpenLayers.Control.PanZoom(),
  37                 new OpenLayers.Control.Permalink()
  38             ],
  39             projection: new OpenLayers.Projection("EPSG:900913"),
  40             displayProjection: new OpenLayers.Projection("EPSG:4326")
  41         } );
  42
  43         this.baseLayer = this.createBaseLayer();
  44         this.dataLayer = this.createDataLayer();
  45         this.map.addLayers([this.baseLayer, this.dataLayer]);
  46
  47         this.selectControl = this.createSelectControl();
  48         this.map.addControl(this.selectControl);
  49         this.selectControl.activate();
  50
  51         if (!this.map.getCenter()) {
  52             this.map.setCenter(new OpenLayers.LonLat(0, 0), 0);
  53         }
  54     },
  55
  56     createBaseLayer: function() {
  57         return new OpenLayers.Layer.OSM("OSM");
  58     },
  59
  60     createDataLayer: function(map) {
  61         var defaultStyle = new OpenLayers.Style({
  62             externalGraphic: this.Markers.ICON,
  63             graphicHeight: "${height}"
  64         }, {
  65             context: {
  66                 height: function(feature) {
  67                     var defaultHeight = SYP.Markers.HEIGHT || 32;
  68                     var increase = 4 * (feature.attributes.count - 1);
  69                     return Math.min(defaultHeight + increase, 50);
  70                 }
  71             }
  72         });
  73         var selectStyle = new OpenLayers.Style({
  74             externalGraphic: this.Markers.SELECT_ICON,
  75             graphicHeight: this.Markers.HEIGHT || 32
  76         });
  77         var styleMap = new OpenLayers.StyleMap (
  78                         {"default": defaultStyle,
  79                          "select": selectStyle});
  80
  81         var layer = new OpenLayers.Layer.GML("KML", "items.php",
  82            {
  83                strategies: [
  84                 new OpenLayers.Strategy.Cluster()
  85                 ],
  86             styleMap: styleMap,
  87             format: OpenLayers.Format.KML,
  88             projection: this.map.displayProjection,
  89             eventListeners: { scope: this,
  90                               loadend: this.dataLayerEndLoad
  91                             }
  92            });
  93
  94         return layer;
  95     },
  96
  97     createSelectControl: function() {
  98         var control = new OpenLayers.Control.SelectFeature(
  99                                             this.dataLayer, {
 100                                                onSelect: this.onFeatureSelect,
 101                                                onUnselect: this.onFeatureUnselect,
 102                                                toggle: true,
 103                                                clickout: false
 104                                                             });
 105         return control;
 106     },
 107
 108     dataLayerEndLoad: function() {
 109         if (!this.checkForFeatures()) {
 110             return;
 111         }
 112
 113         var map = this.map;
 114         if (map.getControlsByClass("OpenLayers.Control.ArgParser")[0].lat
 115             == undefined) { // map center was not set in ArgParser control.
 116             var orig = this.Utils.mbr (this.dataLayer);
 117             var centerBounds = new OpenLayers.Bounds();
 118
 119             var mapProj = map.getProjectionObject();
 120             var sypOrigProj = new OpenLayers.Projection("EPSG:4326");
 121
 122             var bottomLeft = new OpenLayers.LonLat(orig[0],orig[1]);
 123             bottomLeft = bottomLeft.transform(sypOrigProj, mapProj);
 124             var topRight = new OpenLayers.LonLat(orig[2],orig[3])
 125             topRight = topRight.transform(sypOrigProj, mapProj);
 126
 127             centerBounds.extend(bottomLeft);
 128             centerBounds.extend(topRight);
 129             map.zoomToExtent(centerBounds);
 130         }
 131     },
 132
 133     checkForFeatures: function() {
 134         var features = this.dataLayer.features;
 135         if (features.length == 0) {
 136             var message = SypStrings.noImageRegistered;
 137             this.Utils.displayUserMessage(message, "warn");
 138         }
 139         return !!features.length;
 140     },
 141
 142     createPopup: function(position, contentHTML) {
 143         var popup = new OpenLayers.Popup.Anchored("popup",
 144                                                   position,
 145                                                   null,
 146                                                   contentHTML,
 147                                                   null,
 148                                                   true);
 149         popup.autoSize = true;
 150         popup.backgroundColor = ""; // deal with it in css
 151         popup.border = ""; // deal with it in css
 152         popup.closeOnMove = true;
 153         return popup;
 154     },
 155
 156     onFeatureUnselect: function (feature) {
 157         var map = feature.layer.map;
 158         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 159         if (permaControl[0]) {
 160             permaControl[0].div.style.display = "";
 161         }
 162         if (!feature.popup) {
 163             this.map.events.unregister("movestart", this, this._unselect);
 164             return;
 165         }
 166         var popup = feature.popup;
 167         if (popup.visible()) {
 168             popup.hide();
 169         }
 170     },
 171
 172     onFeatureSelect: function(feature) {
 173         var map = feature.layer.map;
 174         if (feature.attributes.count > 1) {
 175             this.unselect(feature);
 176             var lonlat = new OpenLayers.LonLat(feature.geometry.x, feature.geometry.y);
 177             map.setCenter(lonlat, map.zoom + 1);
 178             return;
 179         }
 180         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 181         if (permaControl[0]) {
 182             permaControl[0].div.style.display = "none";
 183         }
 184         var popup = feature.popup;
 185
 186         var popupPos = null;
 187         if (sypSettings.popupNearfeature) {
 188             popupPos = feature.geometry.getBounds().getCenterLonLat();
 189         } else {
 190             popupPos = SYP.Utils.brCorner(map, 8);
 191         }
 192
 193         // we cannot reuse popup; we need to recreate it in order for IE
 194         // expressions to work. Otherwise, we get a 0x0 image on second view.
 195         if (popup) {
 196             popup.destroy();
 197         }
 198         var contentHTML;
 199         if (feature.cluster[0].attributes.name) {
 200             contentHTML = "<h2>" +
 201                           feature.cluster[0].attributes.name +
 202                           "</h2>" +
 203                           feature.cluster[0].attributes.description;
 204         } else {
 205             contentHTML = feature.cluster[0].attributes.description;
 206         }
 207         if (!contentHTML || !contentHTML.length) {
 208             this.map.events.register("movestart", this, this._unselect = function () { this.unselect(feature)});
 209             return;
 210         }
 211         popup = SYP.createPopup(popupPos, contentHTML);
 212         var control = this;
 213         popup.hide = function () {
 214             OpenLayers.Element.hide(this.div);
 215             control.unselectAll();
 216         };
 217         map.addPopup(popup);
 218         feature.popup = popup;
 219         var anchor = popup.div.getElementsByTagName("a")[0];
 220         if (anchor) {
 221             anchor.onclick = function() {
 222                 SYP.showBigImage(this.href);
 223                 return false;
 224             }
 225         }
 226     },
 227
 228     showBigImage: function (href) {
 229         try {
 230             document.getElementById('bigimg_container').style.display = "table";
 231         } catch(e) {
 232             document.getElementById('bigimg_container').style.display = "block";
 233         }
 234         var maxHeight = document.body.clientHeight * 0.9;
 235         var maxWidth = document.body.clientWidth * 0.9;
 236         document.getElementById('bigimg').style.height = "";
 237         document.getElementById('bigimg').style.width = "";
 238         document.getElementById('bigimg').style.maxHeight = maxHeight + "px";
 239         document.getElementById('bigimg').style.maxWidth = maxWidth + "px";
 240         document.getElementById('bigimg').onload = function () {
 241             var icon = document.getElementById('bigimg_close');
 242             icon.style.top = this.offsetTop;
 243             icon.style.left = this.offsetLeft + this.clientWidth - icon.clientWidth;
 244
 245             var heightRatio = this.clientHeight / parseInt(this.style.maxHeight);
 246             var widthRatio = this.clientWidth / parseInt(this.style.maxWidth);
 247             if (heightRatio > 1 || widthRatio > 1) {
 248                 if (heightRatio > widthRatio) {
 249                     this.style.height = this.style.maxHeight;
 250                 } else {
 251                     this.style.width = this.style.maxWidth;
 252                 }
 253             }
 254
 255         };
 256         document.getElementById('bigimg').src = href;
 257     },
 258
 259     closeBigImage: function() {
 260         document.getElementById('bigimg').src = "";
 261         document.getElementById('bigimg').parentNode.innerHTML = document.getElementById('bigimg').parentNode.innerHTML;
 262         document.getElementById('bigimg_container').style.display = "none";
 263     },
 264
 265     Utils: {
 266         brCorner: function(map, margin) {
 267             var bounds = map.calculateBounds();
 268             var corner = new OpenLayers.LonLat(bounds.right, bounds.bottom);
 269             var cornerAsPx = map.getPixelFromLonLat(corner);
 270             cornerAsPx = cornerAsPx.add( -margin, -margin);
 271             corner = map.getLonLatFromPixel(cornerAsPx);
 272             return corner;
 273         },
 274
 275         /* minimum bounds rectangle containing all feature locations.
 276          * FIXME: if two features are close, but separated by 180th meridian,
 277          * their mbr will span the whole earth. Actually, 179° lon and -170°
 278          * lon are considerated very near.
 279          */
 280         mbr: function (layer) {
 281             var features = [];
 282             var map = layer.map;
 283
 284             var mapProj = map.getProjectionObject();
 285             var sypOrigProj = new OpenLayers.Projection("EPSG:4326");
 286
 287             for (var i =0; i < layer.features.length; i++) {
 288                 if (layer.features[i].cluster) {
 289                     features = features.concat(layer.features[i].cluster);
 290                 } else {
 291                     features = features.concat(layer.features);
 292                 }
 293             }
 294
 295             var minlon = 180;
 296             var minlat = 88;
 297             var maxlon = -180;
 298             var maxlat = -88;
 299
 300             if (features.length == 0) {
 301                 // keep default values
 302             } else if (features.length == 1) {
 303                 // in case there's only one feature, we show an area of at least
 304                 // 4 x 4 degrees
 305                 var pos = features[0].geometry.getBounds().getCenterLonLat().clone();
 306                 var lonlat = pos.transform(mapProj, sypOrigProj);
 307
 308                 minlon = Math.max (lonlat.lon - 2, -180);
 309                 maxlon = Math.min (lonlat.lon + 2, 180);
 310                 minlat = Math.max (lonlat.lat - 2, -90);
 311                 maxlat = Math.min (lonlat.lat + 2, 90);
 312             } else {
 313                 for (var i = 0; i < features.length; i++) {
 314                     var pos = features[i].geometry.getBounds().getCenterLonLat().clone();
 315                     var lonlat = pos.transform(mapProj, sypOrigProj);
 316                     minlon = Math.min (lonlat.lon, minlon);
 317                     minlat = Math.min (lonlat.lat, minlat);
 318                     maxlon = Math.max (lonlat.lon, maxlon);
 319                     maxlat = Math.max (lonlat.lat, maxlat);
 320                 }
 321             }
 322
 323             return [minlon, minlat, maxlon, maxlat];
 324
 325         },
 326
 327         displayUserMessage: function(message, status) {
 328             var div = document.getElementById('message');
 329             while (div.firstChild)
 330                 div.removeChild(div.firstChild);
 331             var textNode = document.createTextNode(message);
 332             switch (status) {
 333                 case "error":
 334                     div.style.color = "red";
 335                     break;
 336                 case "warn":
 337                     div.style.color = "#FF8C00";
 338                     break;
 339                 case "success":
 340                     div.style.color = "green";
 341                     break;
 342                 default:
 343                     div.style.color = "black";
 344                     break;
 345             }
 346             div.style.display = "block";
 347             div.appendChild(textNode);
 348         }
 349     }
 350 };
 351
 352 // if possible, determine language with HTTP_ACCEPT_LANGUAGE instead of
 353 // navigator.language
 354 if (OpenLayers.Lang[SypStrings.language]) {
 355     OpenLayers.Lang.setCode(SypStrings.language);
 356 }
 357
 358 // avoid alerts
 359 OpenLayers.Console.userError = function(error) {
 360     SYP.Utils.displayUserMessage(error, "error");
 361 }
 362
 363 // sometimes, especially when cache is clear, firefox does not compute
 364 // correctly popup size. That's because at the end of getRenderedDimensions,
 365 // dimensions of image is not known. So, we work around that problem by setting
 366 // image width and image height. That way, dimensions of image are set in
 367 // innerHTML, and are therefore known in getRenderedDimensions
 368 OpenLayers.Popup.Anchored.prototype.registerImageListeners = function() {
 369     var onImgLoad = function() {
 370         this.img.width =  this.img.width;
 371         this.img.height =  this.img.height;
 372         this.popup.updateSize();
 373         OpenLayers.Event.stopObserving(
 374             this.img, "load", this.img._onImageLoad
 375         );
 376     };
 377
 378     var images = this.contentDiv.getElementsByTagName("img");
 379     for (var i = 0, len = images.length; i < len; i++) {
 380         var img = images[i];
 381         if (img.width == 0 || img.height == 0) {
 382
 383             var context = {
 384                 'popup': this,
 385                 'img': img
 386             };
 387
 388             img._onImgLoad = OpenLayers.Function.bind(onImgLoad, context);
 389
 390             OpenLayers.Event.observe(img, 'load', img._onImgLoad);
 391         }
 392     }
 393 }