/* base function shared by some pages */
/* Copyright (C) 2009  Étienne Loks  <etienne.loks_AT_peacefrogsDOTnet>

This program 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 3 of the
License, or (at your option) any later version.

This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

See the file COPYING for details.
*/

/* show a block panel */
function show(id){
    document.getElementById(id).style.display = 'block';
}

/* hide a panel */
function hide(id){
    document.getElementById(id).style.display = 'None';
}

function saveExtent() {
    /* save the current extent in a cookie */
    if(!map) return;
    document.cookie = "MAP_EXTENT=" + map.getExtent().toArray().join('_')
                      + ';path="/"';
}

function getExtent() {
    /* get the current extent from a cookie */
    var cookies = document.cookie.split(';');
    var map_extent;
    for (i in cookies){
        var items = cookies[i].split('=');
        key = items[0].split(' ').join('');
        if (key == 'MAP_EXTENT'){
            map_extent = items[1].split('_');
        }
    }
    return map_extent;
}

function zoomToCurrentExtent(map){
    /* zoom to current extent */
    var current_extent = getExtent();
    if (OpenLayers && current_extent && current_extent.length == 4){
        extent = new OpenLayers.Bounds(current_extent[0], current_extent[1],
                                       current_extent[2], current_extent[3]);
        map.zoomToExtent(extent, true);
        return true;
    }
    else{
        return;
    }
}