V3: Line with trend lines

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/serial.js"></script>
<div id="chartdiv" style="width: 100%; height: 362px;"></div>

JavaScript

var chart;

var chartData = [
    {
        "date": "2012-01-01",
        "value": 8
    },
    {
        "date": "2012-01-01",
        "value": 8
    },
    {
        "date": "2012-01-02",
        "value": 10
    },
    {
        "date": "2012-01-03",
        "value": 12
    },
    {
        "date": "2012-01-04",
        "value": 14
    },
    {
        "date": "2012-01-05",
        "value": 11
    },
    {
        "date": "2012-01-06",
        "value": 6
    },
    {
        "date": "2012-01-07",
        "value": 7
    },
    {
        "date": "2012-01-08",
        "value": 9
    },
    {
        "date": "2012-01-09",
        "value": 13
    },
    {
        "date": "2012-01-10",
        "value": 15
    },
    {
        "date": "2012-01-11",
        "value": 19
    },
    {
        "date": "2012-01-12",
        "value": 21
    },
    {
        "date": "2012-01-13",
        "value": 22
    },
    {
        "date": "2012-01-14",
        "value": 20
    },
    {
        "date": "2012-01-15",
        "value": 18
    },
    {
        "date": "2012-01-16",
        "value": 14
    },
    {
        "date": "2012-01-17",
        "value": 16
    },
    {
        "date": "2012-01-18",
        "value": 18
    },
    {
        "date": "2012-01-19",
        "value": 17
    },
    {
        "date": "2012-01-20",
        "value": 15
    },
    {
        "date": "2012-01-21",
        "value": 12
    },
    {
        "date": "2012-01-22",
        "value": 10
    },
    {
        "date": "2012-01-23",
        "value": 8
    }
];


AmCharts.ready(function () {
    // SERIAL CHART        
    chart = new AmCharts.AmSerialChart();
    chart.pathToImages = "http://www.amcharts.com/lib/3/images/";
    chart.dataProvider = chartData;
    chart.dataDateFormat = "YYYY-MM-DD";
    chart.categoryField = "date";
    
    
    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.parseDates = true; // as our data is date-based, we set parseDates to true
   ...