package main import ( "net/http" "github.com/wcharczuk/go-chart" "github.com/wcharczuk/go-chart/seq" ) func drawChart(res http.ResponseWriter, req *http.Request) { /* In this example we add a new type of series, a `SimpleMovingAverageSeries` that takes another series as a required argument. InnerSeries only needs to implement `ValuesProvider`, so really you could chain `SimpleMovingAverageSeries` together if you wanted. */ mainSeries := chart.ContinuousSeries{ Name: "A test series", XValues: seq.Range(1.0, 100.0), //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements. YValues: seq.RandomValuesWithAverage(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements. } // note we create a LinearRegressionSeries series by assignin the inner series. // we need to use a reference because `.Render()` needs to modify state within the series. linRegSeries := &chart.LinearRegressionSeries{ InnerSeries: mainSeries, } // we can optionally set the `WindowSize` property which alters how the moving average is calculated. graph := chart.Chart{ Series: []chart.Series{ mainSeries, linRegSeries, }, } res.Header().Set("Content-Type", "image/png") graph.Render(chart.PNG, res) } func main() { http.HandleFunc("/", drawChart) http.ListenAndServe(":8080", nil) }