Displaying bullets on specified points only

In some cases you might need to show bullet only at a specific data point, not all of them. Or you might need to have  a different from default bullet for some points. To do this, you should first add bullet field in your data provider, for example:

var chartData = [{
    "date": "2009-10-26",
    "value": 72,
    "bullet": "round",
    "description": "Something good happened!"
},
{
    "date": "2009-10-27",
    "value": 43
},
{
    "date": "2009-10-30",
    "value": 31
}]

Next, you have to specify bulletField for your graph. As we named this field "bullet" in data provider, we set it to "bullet":

graph.bulletField = "bullet";

If you want to show some description when user rolls-over the data item, you should add description in the data provider and also set descriptionField for your graph.

AmGraph has a possibility to set different fields like alphaField, bulletSizeField, colorField, dashLengthField, etc. You can modify the look of specific data points using the same technique.

Here is a working sample of a chart with bullets and descriptions at specific points.