Source: maps/limbs/layout/OrderedLayoutStrategy.js

/**
 * @class
 * A strategy that orders the z-index of all LIMBs according to the distance to the target.
 * LIMBs representing targets that are closest to the map will be shown above those that are further away.
 * 
 * @constructor
 * @param {lucid.maps.limbs.layout.OrderedLayoutStrategyOptions} options  The options controlling the layout.
 */
lucid.maps.limbs.layout.OrderedLayoutStrategy = function( options )
{
	lucid.maps.limbs.layout.LayoutStrategy.apply( this, [options] );

	
	var limbs;
	var maxDistance;
	
	
	this.layout = function( div, position, mapDetails )
	{
		var distance = google.maps.geometry.spherical.computeDistanceBetween( mapDetails.viewCentre, mapDetails.targetLocation );
		
		if (distance > maxDistance)
		{
			maxDistance = distance;
		}
		
		limbs[limbs.length] = { element: div,
		                        position: position,
		                        distance: distance };
	};
	
	this.init = function()
	{
		limbs = [];
		maxDistance = 0;
	};
	
	this.complete = function()
	{
		var zIndexMin = this.getMinZIndex();
		var zIndexMax = this.getMaxZIndex();
		var zIndexRange = zIndexMax - zIndexMin;
		var zIndexDistanceRatio = zIndexRange / maxDistance;
		
		for (var i=0; i<limbs.length; i++)
		{
			var limb = limbs[i];
			
			limb.element.css( "left", limb.position.x );
			limb.element.css( "top", limb.position.y );
			limb.element.css( "zIndex", computeLimbElementZIndex( limb.distance ) );
		}
		
		limbs = null;
		maxDistance = null;
		
		function computeLimbElementZIndex( distance )
		{
			return Math.floor( zIndexMax - (zIndexDistanceRatio * distance) );
		}
	};
	
};


/**
 * @type {object}
 * @augments lucid.maps.limbs.layout.LayoutStrategyOptions
 */
lucid.maps.limbs.layout.OrderedLayoutStrategyOptions = {};