go-chart/_examples/linear_regression/main.go

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package main
import (
"net/http"
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"git.gutmet.org/go-chart.git"
"git.gutmet.org/go-chart.git/seq"
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)
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.
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*/
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.RandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements.
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}
// 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)
}