/*
 * JavaScript code to generate maps used by the
 * Seismological Observatory of the Ruhr-University Bochum
 * 
 * Copyright 2012 Kasper D. Fischer <kasper.fischer@rub.de>
 * 
 * License
 *
 * 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/.
 *
 * $Id: station_map.js 321 2012-02-13 14:52:11Z kasper $

*/

/* Global variables */
var mapkey;

/* Main function to create the map */
function initKey(showMag, showAge, showStation) {
	
	/* Creating map */
	wgs84 = new OpenLayers.Projection("EPSG:4326");
	mapkey = new OpenLayers.Map(
		'mapkey',
		{
			projection: wgs84,
			displayProjection: wgs84,
            controls: []
			}
		);

	// Show Magnitudes
	mag_layer = new OpenLayers.Layer.Vector(
	    'Magnitude Scale',
	    {
            projection: wgs84,
            isBaseLayer: true
	    }
	);

	// Adding custom style for Magnitudes   
	var mag_style_default = new OpenLayers.Style({
	        fillColor: '#ff0000', fillOpacity: 0.2,
	        strokeColor: '#ff0000', strokeWidth: 2,
	        pointRadius: "${pntsize}",
	        label: "${text}", labelXOffset: "${offset}",
	        graphicName: 'circle'
	});
	var mag_style_map = new OpenLayers.StyleMap({
	    'default': mag_style_default
	});
	mag_layer.styleMap = mag_style_map;

    // Adding points as map key, size: mag*3.5+2.0
    var pointt = new OpenLayers.Geometry.Point(-10, 0);
    var mag_pointt = new OpenLayers.Feature.Vector(pointt, {pntsize: 0, text: 'Magnitude', offset: 2});
    var point0 = new OpenLayers.Geometry.Point(0, 0);
    var mag_point0 = new OpenLayers.Feature.Vector(point0, {pntsize: 0.5*3.5+2.0, text: '0.5', offset: 17});
    var point1 = new OpenLayers.Geometry.Point(10, 0);
    var mag_point1 = new OpenLayers.Feature.Vector(point1, {pntsize: 1.5*3.5+2.0, text: '1.5', offset: 20.5});
    var point2 = new OpenLayers.Geometry.Point(20, 0);
    var mag_point2 = new OpenLayers.Feature.Vector(point2, {pntsize: 2.5*3.5+2.0, text: '2.5', offset: 24.0});
    var point3 = new OpenLayers.Geometry.Point(30, 0);
    var mag_point3 = new OpenLayers.Feature.Vector(point3, {pntsize: 3.5*3.5+2.0, text: '3.5', offset: 27.5});
    mag_layer.addFeatures([mag_pointt, mag_point0, mag_point1, mag_point2, mag_point3]);


	mapkey.addLayer(mag_layer);
	mag_layer.setVisibility(true);

	// Set initial view
	if (!mapkey.getCenter()) {
	    mapkey.setCenter(0,0);
	    mapkey.zoomToExtent(mag_layer.getDataExtent());
	}
}