/* base function shared by some pages */
/* Copyright (C) 2009-2010  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.
*/

var default_area;
var area_name;

/* 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;
    var extent_key = 'MAP_EXTENT';
    if (area_name){ extent_key = extent_key + '_' + area_name; }
    document.cookie = extent_key + "=" + map.getExtent().toArray().join('_')
                      + ';path="/"';
}

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

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