var dataSets = new Array();


google.load("visualization", "1", {packages:["annotatedtimeline"]});

function myresetCharts(){



	for(var i in dataSets){
		var a = dataSets[i].data;
				
		a.removeRows( 0, a.getNumberOfRows());
		a.removeColumns(0, a.getNumberOfColumns());
		
		
	}
	
	chartInit();
	
}


function chartInit(){

/*
	var div = "chartBeds";
	var d = createData(div);
	chartPreSets(d);
	chartDraw(div, d);
	*/
	
	
	createChart("chartBeds", "Beds Operated");
	
	
	
	
	
}


function createChart(div, title){

	var d  = createData(div, title);
	var c = chartDraw(div);
	return c;
	
}




function createData(div, title) {
   		var data = new google.visualization.DataTable();   
        var o = new Object();
        
        
        
        data.addColumn('date', 'Date');
        data.addColumn('number', title);
        
        
        o.data = data;
        o.count = 0;
        dataSets[div] = o;
        
       
        
        return data;
        
}

function updateChart(div, date, val){

	addDateToDataTable(div, date, val);
	chartDraw(div);

}

function addDateToDataTable(div, date, val){
	//pre: date is a Date object

	var dataObj = dataSets[div];
	var data = dataObj.data;
	
	var index = data.addRow();
	
	data.setValue(index, 0, date);
	data.setValue(index, 1, val);
	

}


function chartDraw(div){

	var data = dataSets[div].data;

	var chart = new google.visualization.AnnotatedTimeLine(document.getElementById(div));
    chart.draw(data, {displayAnnotations: false, legendPosition:"newRow", displayExactValues:true, displayZoomButtons:false } );
    
    dataSets[div].chart = chart;
    return chart;



}