(function (Highcharts) {
  	var seriesTypes = Highcharts.seriesTypes,
  		each = Highcharts.each;
  	
  	seriesTypes.heatmap = Highcharts.extendClass(seriesTypes.map, {
  		colorKey: 'z',
  		useMapGeometry: false,
  		pointArrayMap: ['y', 'z'],
  		translate: function () {
  			var series = this,
  				options = series.options,
  				dataMin = Number.MAX_VALUE,
  				dataMax = Number.MIN_VALUE;
  
  			series.generatePoints();
  	
  			each(series.data, function (point) {
  				var x = point.x,
  					y = point.y,
  					value = point.z,
  					xPad = (options.colsize || 1) / 2,
  					yPad = (options.rowsize || 1) / 2;
  
  				point.path = [
  					'M', x - xPad, y - yPad,
  					'L', x + xPad, y - yPad,
  					'L', x + xPad, y + yPad,
  					'L', x - xPad, y + yPad,
  					'Z'
  				];
  				
  				point.shapeType = 'path';
  				point.shapeArgs = {
  					d: series.translatePath(point.path)
  				};
  				
  				if (typeof value === 'number') {
  					if (value > dataMax) {
  						dataMax = value;
  					} else if (value < dataMin) {
  						dataMin = value;
  					}
  				}
  			});
  			
  			series.translateColors(dataMin, dataMax);
  		},
  		
  		getBox: function () {}
  			
  	});
  	
  }(Highcharts));