package main import ( "log" "net/http" _ "net/http/pprof" "git.gutmet.org/go-chart.git" "git.gutmet.org/go-chart.git/drawing" "git.gutmet.org/go-chart.git/seq" ) func drawChart(res http.ResponseWriter, req *http.Request) { viridisByY := func(xr, yr chart.Range, index int, x, y float64) drawing.Color { return chart.Viridis(y, yr.GetMin(), yr.GetMax()) } graph := chart.Chart{ Series: []chart.Series{ chart.ContinuousSeries{ Style: chart.Style{ Show: true, StrokeWidth: chart.Disabled, DotWidth: 5, DotColorProvider: viridisByY, }, XValues: seq.Range(0, 127), YValues: seq.New(seq.NewRandom().WithLen(128).WithMax(1024)).Array(), }, }, } res.Header().Set("Content-Type", chart.ContentTypePNG) err := graph.Render(chart.PNG, res) if err != nil { log.Println(err.Error()) } } func unit(res http.ResponseWriter, req *http.Request) { graph := chart.Chart{ Height: 50, Width: 50, Canvas: chart.Style{ Padding: chart.BoxZero, }, Background: chart.Style{ Padding: chart.BoxZero, }, Series: []chart.Series{ chart.ContinuousSeries{ XValues: seq.RangeWithStep(0, 4, 1), YValues: seq.RangeWithStep(0, 4, 1), }, }, } res.Header().Set("Content-Type", chart.ContentTypePNG) err := graph.Render(chart.PNG, res) if err != nil { log.Println(err.Error()) } } func main() { http.HandleFunc("/", drawChart) http.HandleFunc("/unit", unit) log.Fatal(http.ListenAndServe(":8080", nil)) }