Using Group Markers in a Chart

By default, charts render a marker for each data point in a series. This is useful for interactivity and custom styling but when there are many data points, performance can suffer. With a ComboSeries, you can set showMarkers to false and interactionType to planar for larger data sets, but this is of no help with a histogram. Additionally, you may still prefer visual markers for each data point in your chart. In this example, we'll take a large data set and display it on a ComboSeries with groupMarkers.

//set canvas as the defaultGraphicEngine
YUI({
    defaultGraphicEngine: "canvas"
}).use('charts', function (Y) 
{
    var myDataValues = getData(); 
   
    //style the series
    var myseries = [
        {
            styles: {
                line: {
                    weight: 1
                }
            }
        },
        {
            styles: {
                line: {
                    weight: 1
                }
            }
        }

    ];

    //instantiate chart with interactionType of planar and groupMarkers set to true
    var mychart = new Y.Chart({
            interactionType:"planar", 
            groupMarkers:true, 
            dataProvider:myDataValues, 
            categoryType:"time", 
            categoryKey:"date", 
            render:"#mychart", 
            seriesCollection: myseries,
        });
        
});