Redraw Charts without removing it

[Andrew Barker]

Hi I am using google charts API, im calling a pie chart here is the code

google.setOnLoadCallback(drawChart);

function drawChart() {
        $.ajax({
            url: 
"http://X3/playeruptime/system/?class=PlayerUptime&method=playerUptimePie&data={%22start%22:%222017-05-01%22,%22end%22:%222017-05-23%22}";,
            success: function(result){
                var dat = JSON.parse(result);
                var data = new google.visualization.DataTable();
                data.addColumn('string', 'key');
                data.addColumn('number', 'value');
                data.addRows(dat);

                // Set chart options
                var options = {
                    'width':500,
                    'height':315,
                    is3D: true,
                    colors: [
                        "#64cc34",
                        "#ff0000"
                    ],
                    animation: {
                        startup: true,
                        duration: 2000,
                        easing: 'in'
                    },
                    legend: {
                        position: 'right',
                        alignment:'center',
                        textStyle: {
                            fontSize: 35,
                            color: '#616161'
                        }
                    },
                    chartArea: {left: 0, top: 0, right:50, width: "100%", 
height: "100%"}
                };

                // Instantiate and draw our chart, passing in some options.
                var chart = new 
google.visualization.PieChart(document.getElementById('AverageUptimePie'));
                chart.draw(data, options);

                var onNum = dat[0][1];
                var offNum = dat[1][1];

I need to know how do I reload the data in the charts periodically without 
redrawing the charts in the sense that I dont want the chart to disappear 
once data has been reloaded

Is there a redraw method that updates data to what it should be without 
deleting chart


Thanks

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