/**
* Written by Shane Tomlinson 2010
* http://www.shanetomlinson.com
* Released under Creative Commons Attribution Licence 3.0
* http://creativecommons.org/licenses/by/3.0/
* Uses LatLon, Spherical formulas from Chris Veness
* http://www.movable-type.co.uk/scripts/latlong.html
*/

/**
* This is a subclass of DistanceMarkerPointsCalculator that can
*	work with GMaps API v3.  Its loadLine takes a Polyline
*	and places GMarkers at the specified interval.
*
* @class GMapsDistanceMarkers
*/
function GMapsDistanceMarkers() {
	DistanceMarkerPointsCalculator.apply(this, arguments);
}
GMapsDistanceMarkers.prototype = new DistanceMarkerPointsCalculator();


GMapsDistanceMarkers.prototype.init = function(config)
{
    this.map = config.map;
    DistanceMarkerPointsCalculator.prototype.init.apply(this, arguments);
};


/**
* Load an object that represents a line and convert each point to 
*	a LatLon.  For each point in the line, call this.addLatLon with
*	the LatLon version of the point
* @method loadLine
* @param {object} line - line to load.
*/
GMapsDistanceMarkers.prototype.loadLine = function(line)
{
    var path = line.getPath();
    var me = this;
    this.currMarker = 0;

    path.forEach(function(latLng, index)
    {
	var latLon = new LatLon(latLng.lat(), latLng.lng());
	me.addLatLon(latLon);
    });
};

/**
* This method converts a LatLon used by the calculator to a point
*	that can be used by the user of the calculator.  This could be
*	to convert it to a user defined point for storage or to a point
*	to place on a map.
* @method latLonToDistanceMarker
* @param {object} latLon - a LatLon object.
* @return {object} an object that represents a point.
*/
GMapsDistanceMarkers.prototype.latLonToDistanceMarker = function(latLon)
{
    var latLng = new google.maps.LatLng(latLon.lat(), latLon.lon());    
    this.currMarker++;

    var marker = new google.maps.Marker({
	    map: this.map,
	    icon: "/images/distance/marker" + this.currMarker + ".png",
	    position: latLng,
	    visible: false
	});
    return marker;
};