Dygraph with gaps only works with rollPeriod = 1

问题

I am facing the following issue using dygraph. I show multiple graphs, most of them only have one series and I want them to show gaps instead of connecting the gaps edges. This works fine, until I change the "rollPeriod" option. When I do so, no error occurs but the graphs become invisible, meaning the data points show up when I move the mouse over the graph but the graph itself is invisible.

Here are my dygraph options:

labelsDivStyles: { 'backgroundColor': 'transparent','textAlign': 'right' },
labelsSeparateLines: true,
digitsAfterDecimal: 4,
drawGapPoints: true,
fillGraph : true,
strokeWidth: 3,
axisLabelFont: "Open Sans",
xAxisLabelWidth : "60",
rollPeriod: 3,
showRangeSelector: true,
rangeSelectorHeight: 30,
rangeSelectorPlotStrokeColor: '#617e2b',
rangeSelectorPlotFillColor: '#414a4c',
pixelsPerLabel : 60,
labelsKMG2: true,
axes : {
    x: {
        valueFormatter: function(d) {
            return xAxisFormat(d);
        }
    },
    y: {
        ticker: Dygraph.numericLinearTicks
    }
}

Thanks for any help, i run out of ideas.

来源：https://stackoverflow.com/questions/22043806/dygraph-with-gaps-only-works-with-rollperiod-1