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