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         switch (sypSettings.popupPos) {
 188             case 0:
 189                 popupPos = feature.geometry.getBounds().getCenterLonLat();
 190             break;
 191             case 1:
 192                 popupPos = SYP.Utils.tlCorner(map, 8);
 193             break;
 194             case 2:
 195                 popupPos = SYP.Utils.trCorner(map, 8);
 196             break;
 197             case 3:
 198                 popupPos = SYP.Utils.brCorner(map, 8);
 199             break;
 200             case 4:
 201                 popupPos = SYP.Utils.blCorner(map, 8);
 202             break;
 203             default:
 204                 popupPos = SYP.Utils.brCorner(map, 8);
 205            break;
 206         }
 207
 208         // we cannot reuse popup; we need to recreate it in order for IE
 209         // expressions to work. Otherwise, we get a 0x0 image on second view.
 210         if (popup) {
 211             popup.destroy();
 212         }
 213         var contentHTML;
 214         if (feature.cluster[0].attributes.name) {
 215             contentHTML = "<h2>" +
 216                           feature.cluster[0].attributes.name +
 217                           "</h2>" +
 218                           feature.cluster[0].attributes.description;
 219         } else {
 220             contentHTML = feature.cluster[0].attributes.description;
 221         }
 222         if (!contentHTML || !contentHTML.length) {
 223             this.map.events.register("movestart", this, this._unselect = function () { this.unselect(feature)});
 224             return;
 225         }
 226         popup = SYP.createPopup(popupPos, contentHTML);
 227         var control = this;
 228         popup.hide = function () {
 229             OpenLayers.Element.hide(this.div);
 230             control.unselectAll();
 231         };
 232         map.addPopup(popup);
 233         feature.popup = popup;
 234         var anchor = popup.div.getElementsByTagName("a")[0];
 235         if (anchor) {
 236             anchor.onclick = function() {
 237                 SYP.showBigImage(this.href);
 238                 return false;
 239             }
 240         }
 241     },
 242
 243     showBigImage: function (href) {
 244         try {
 245             document.getElementById('bigimg_container').style.display = "table";
 246         } catch(e) {
 247             document.getElementById('bigimg_container').style.display = "block";
 248         }
 249         var maxHeight = document.body.clientHeight * 0.9;
 250         var maxWidth = document.body.clientWidth * 0.9;
 251         document.getElementById('bigimg').style.height = "";
 252         document.getElementById('bigimg').style.width = "";
 253         document.getElementById('bigimg').style.maxHeight = maxHeight + "px";
 254         document.getElementById('bigimg').style.maxWidth = maxWidth + "px";
 255         document.getElementById('bigimg').onload = function () {
 256             var heightRatio = this.clientHeight / parseInt(this.style.maxHeight);
 257             var widthRatio = this.clientWidth / parseInt(this.style.maxWidth);
 258             if (heightRatio > 1 || widthRatio > 1) {
 259                 if (heightRatio > widthRatio) {
 260                     this.style.height = this.style.maxHeight;
 261                 } else {
 262                     this.style.width = this.style.maxWidth;
 263                 }
 264             }
 265
 266             var icon = document.getElementById('bigimg_close');
 267             icon.style.top = this.offsetTop;
 268             icon.style.left = this.offsetLeft + this.clientWidth - icon.clientWidth;
 269
 270         };
 271         document.getElementById('bigimg').src = href;
 272     },
 273
 274     closeBigImage: function() {
 275         document.getElementById('bigimg').src = "";
 276         document.getElementById('bigimg').parentNode.innerHTML = document.getElementById('bigimg').parentNode.innerHTML;
 277         document.getElementById('bigimg_container').style.display = "none";
 278     },
 279
 280     Utils: {
 281         tlCorner: function(map, margin) {
 282             var bounds = map.calculateBounds();
 283             var corner = new OpenLayers.LonLat(bounds.left, bounds.top);
 284             var cornerAsPx = map.getPixelFromLonLat(corner);
 285             cornerAsPx = cornerAsPx.add( +margin, +margin);
 286             return map.getLonLatFromPixel(cornerAsPx);
 287         },
 288
 289         trCorner: function(map, margin) {
 290             var bounds = map.calculateBounds();
 291             var corner = new OpenLayers.LonLat(bounds.right, bounds.top);
 292             var cornerAsPx = map.getPixelFromLonLat(corner);
 293             cornerAsPx = cornerAsPx.add( -margin, +margin);
 294             return map.getLonLatFromPixel(cornerAsPx);
 295         },
 296
 297         brCorner: function(map, margin) {
 298             var bounds = map.calculateBounds();
 299             var corner = new OpenLayers.LonLat(bounds.right, bounds.bottom);
 300             var cornerAsPx = map.getPixelFromLonLat(corner);
 301             cornerAsPx = cornerAsPx.add( -margin, -margin);
 302             return map.getLonLatFromPixel(cornerAsPx);
 303         },
 304
 305         blCorner: function(map, margin) {
 306             var bounds = map.calculateBounds();
 307             var corner = new OpenLayers.LonLat(bounds.left, bounds.bottom);
 308             var cornerAsPx = map.getPixelFromLonLat(corner);
 309             cornerAsPx = cornerAsPx.add( +margin, -margin);
 310             return map.getLonLatFromPixel(cornerAsPx);
 311         },
 312
 313         /* minimum bounds rectangle containing all feature locations.
 314          * FIXME: if two features are close, but separated by 180th meridian,
 315          * their mbr will span the whole earth. Actually, 179° lon and -170°
 316          * lon are considerated very near.
 317          */
 318         mbr: function (layer) {
 319             var features = [];
 320             var map = layer.map;
 321
 322             var mapProj = map.getProjectionObject();
 323             var sypOrigProj = new OpenLayers.Projection("EPSG:4326");
 324
 325             for (var i =0; i < layer.features.length; i++) {
 326                 if (layer.features[i].cluster) {
 327                     features = features.concat(layer.features[i].cluster);
 328                 } else {
 329                     features = features.concat(layer.features);
 330                 }
 331             }
 332
 333             var minlon = 180;
 334             var minlat = 88;
 335             var maxlon = -180;
 336             var maxlat = -88;
 337
 338             if (features.length == 0) {
 339                 // keep default values
 340             } else if (features.length == 1) {
 341                 // in case there's only one feature, we show an area of at least
 342                 // 4 x 4 degrees
 343                 var pos = features[0].geometry.getBounds().getCenterLonLat().clone();
 344                 var lonlat = pos.transform(mapProj, sypOrigProj);
 345
 346                 minlon = Math.max (lonlat.lon - 2, -180);
 347                 maxlon = Math.min (lonlat.lon + 2, 180);
 348                 minlat = Math.max (lonlat.lat - 2, -90);
 349                 maxlat = Math.min (lonlat.lat + 2, 90);
 350             } else {
 351                 for (var i = 0; i < features.length; i++) {
 352                     var pos = features[i].geometry.getBounds().getCenterLonLat().clone();
 353                     var lonlat = pos.transform(mapProj, sypOrigProj);
 354                     minlon = Math.min (lonlat.lon, minlon);
 355                     minlat = Math.min (lonlat.lat, minlat);
 356                     maxlon = Math.max (lonlat.lon, maxlon);
 357                     maxlat = Math.max (lonlat.lat, maxlat);
 358                 }
 359             }
 360
 361             return [minlon, minlat, maxlon, maxlat];
 362
 363         },
 364
 365         displayUserMessage: function(message, status) {
 366             var div = document.getElementById('message');
 367             while (div.firstChild)
 368                 div.removeChild(div.firstChild);
 369             var textNode = document.createTextNode(message);
 370             switch (status) {
 371                 case "error":
 372                     div.style.color = "red";
 373                     break;
 374                 case "warn":
 375                     div.style.color = "#FF8C00";
 376                     break;
 377                 case "success":
 378                     div.style.color = "green";
 379                     break;
 380                 default:
 381                     div.style.color = "black";
 382                     break;
 383             }
 384             div.style.display = "block";
 385             div.appendChild(textNode);
 386         }
 387     }
 388 };
 389
 390 // if possible, determine language with HTTP_ACCEPT_LANGUAGE instead of
 391 // navigator.language
 392 if (OpenLayers.Lang[SypStrings.language]) {
 393     OpenLayers.Lang.setCode(SypStrings.language);
 394 }
 395
 396 // avoid alerts
 397 OpenLayers.Console.userError = function(error) {
 398     SYP.Utils.displayUserMessage(error, "error");
 399 }
 400
 401 // sometimes, especially when cache is clear, firefox does not compute
 402 // correctly popup size. That's because at the end of getRenderedDimensions,
 403 // dimensions of image is not known. Then, popup size is too small for its
 404 // content. We work around the problem by checking that computed size is at
 405 // least as big as content. To achieve that, we need to override
 406 // OpenLayers.Popup.Anchored.prototype.updateSize to modify it slightly.
 407 OpenLayers.Popup.Anchored.prototype.updateSize = function() {
 408     // determine actual render dimensions of the contents by putting its
 409     // contents into a fake contentDiv (for the CSS) and then measuring it
 410     var preparedHTML = "<div class='" + this.contentDisplayClass+ "'>" +
 411         this.contentDiv.innerHTML +
 412         "</div>";
 413
 414     var containerElement = (this.map) ? this.map.layerContainerDiv
 415                                       : document.body;
 416     var realSize = OpenLayers.Util.getRenderedDimensions(
 417         preparedHTML, null,     {
 418             displayClass: this.displayClass,
 419             containerElement: containerElement
 420         }
 421     );
 422
 423     /*
 424      * XXX: next four lines are added by SYP!
 425      */
 426     if (this.contentDiv) {
 427         realSize.w = Math.max (realSize.w, this.contentDiv.scrollWidth);
 428         realSize.h = Math.max (realSize.h, this.contentDiv.scrollHeight);
 429     }
 430
 431     // is the "real" size of the div is safe to display in our map?
 432     var safeSize = this.getSafeContentSize(realSize);
 433
 434     var newSize = null;
 435     if (safeSize.equals(realSize)) {
 436         //real size of content is small enough to fit on the map,
 437         // so we use real size.
 438         newSize = realSize;
 439
 440     } else {
 441
 442         //make a new OL.Size object with the clipped dimensions
 443         // set or null if not clipped.
 444         var fixedSize = new OpenLayers.Size();
 445         fixedSize.w = (safeSize.w < realSize.w) ? safeSize.w : null;
 446         fixedSize.h = (safeSize.h < realSize.h) ? safeSize.h : null;
 447
 448             if (fixedSize.w && fixedSize.h) {
 449                 //content is too big in both directions, so we will use
 450                 // max popup size (safeSize), knowing well that it will
 451                 // overflow both ways.
 452                 newSize = safeSize;
 453             } else {
 454                 //content is clipped in only one direction, so we need to
 455                 // run getRenderedDimensions() again with a fixed dimension
 456                 var clippedSize = OpenLayers.Util.getRenderedDimensions(
 457                     preparedHTML, fixedSize, {
 458                         displayClass: this.contentDisplayClass,
 459                         containerElement: containerElement
 460                     }
 461                 );
 462
 463                 //if the clipped size is still the same as the safeSize,
 464                 // that means that our content must be fixed in the
 465                 // offending direction. If overflow is 'auto', this means
 466                 // we are going to have a scrollbar for sure, so we must
 467                 // adjust for that.
 468                 //
 469                 var currentOverflow = OpenLayers.Element.getStyle(
 470                     this.contentDiv, "overflow"
 471                 );
 472                 if ( (currentOverflow != "hidden") &&
 473                      (clippedSize.equals(safeSize)) ) {
 474                     var scrollBar = OpenLayers.Util.getScrollbarWidth();
 475                     if (fixedSize.w) {
 476                         clippedSize.h += scrollBar;
 477                     } else {
 478                         clippedSize.w += scrollBar;
 479                     }
 480                 }
 481
 482                 newSize = this.getSafeContentSize(clippedSize);
 483             }
 484         }
 485         this.setSize(newSize);
 486 }