var chart;
var chartData = [];
var chartCursor;
var day = 0;
var firstDate = new Date();
firstDate.setDate(firstDate.getDate() - 500);

// 创建展示用的随机数据, quite different range
function generateChartData() {
    for (day = 0; day < 50; day++) {
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + day);

        var visits = Math.round(Math.random() * 40) - 20;

        chartData.push({
            date: newDate,
            visits: visits
        });
    }
}

// 创建报表图形
AmCharts.ready(function() {
    //获取报表数据
    generateChartData();

    // SERIAL CHART   
    chart = new AmCharts.AmSerialChart();
    chart.pathToImages = "http://www.amcharts.com/lib/images/";
    chart.marginTop = 0;
    chart.marginRight = 10;
    chart.autoMarginOffset = 5;
    chart.zoomOutButton = {
        backgroundColor: '#000000',
        backgroundAlpha: 0.15
    };
    chart.dataProvider = chartData;
    chart.categoryField = "date";

    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.parseDates = true; // 如果x坐标是日期，这里设置true
    categoryAxis.minPeriod = "DD"; // our data is daily, so we set minPeriod to DD
    categoryAxis.dashLength = 1;
    categoryAxis.gridAlpha = 0.15;
    categoryAxis.axisColor = "#DADADA";

    // value               
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.axisAlpha = 0.2;
    valueAxis.dashLength = 1;
    chart.addValueAxis(valueAxis);

    // GRAPH
    var graph = new AmCharts.AmGraph();
    graph.title = "red line";
    graph.valueField = "visits";
    graph.bullet = "round";
    graph.bulletBorderColor = "#FFFFFF";
    graph.bulletBorderThickness = 2;
    graph.lineThickness = 2;
    graph.lineColor = "#b5030d";
    graph.negativeLineColor = "#0352b5";
    graph.hideBulletsCount = 50; // this makes the chart to hide bullets when there are more than 50 series in selection
    chart.addGraph(graph);

    // CURSOR
    chartCursor = new AmCharts.ChartCursor();
    chartCursor.cursorPosition = "mouse";
    chart.addChartCursor(chartCursor);

    // SCROLLBAR
    var chartScrollbar = new AmCharts.ChartScrollbar();
    chartScrollbar.graph = graph;
    chartScrollbar.scrollbarHeight = 40;
    chartScrollbar.color = "#FFFFFF";
    chartScrollbar.autoGridCount = true;
    chart.addChartScrollbar(chartScrollbar);

    // WRITE
    chart.write("chartdiv");
   
    // 每秒自动更新报表数据
    setInterval(function () {
        // normally you would load new datapoints here,
        // but we will just generate some random values
        // and remove the value from the beginning so that
        // we get nice sliding graph feeling
       
        // 移除最左边的数据点
        chart.dataProvider.shift();
       
        // 在右侧增加数据点，形成报表从右往左移动的效果
        day++;
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + day);
        var visits = Math.round(Math.random() * 40) - 20;
        chart.dataProvider.push({
            date: newDate,
            visits: visits
        });//这里用push追加数据，也可以直接 chart.dataProvider = Array 新数据;
        chart.validateData();
    }, 1000);
});