go-chart/_examples/min_max/main.go

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package main
import (
"net/http"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/seq"
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)
func drawChart(res http.ResponseWriter, req *http.Request) {
mainSeries := chart.ContinuousSeries{
Name: "A test series",
XValues: seq.Range(1.0, 100.0),
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YValues: seq.New(seq.NewRandom().WithLen(100).WithMax(150).WithMin(50)).Array(),
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}
minSeries := &chart.MinSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
maxSeries := &chart.MaxSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
graph := chart.Chart{
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Width: 1920,
Height: 1080,
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YAxis: chart.YAxis{
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Name: "Random Values",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
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Range: &chart.ContinuousRange{
Min: 25,
Max: 175,
},
},
XAxis: chart.XAxis{
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Name: "Random Other Values",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
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},
Series: []chart.Series{
mainSeries,
minSeries,
maxSeries,
chart.LastValueAnnotation(minSeries),
chart.LastValueAnnotation(maxSeries),
},
}
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graph.Elements = []chart.Renderable{chart.Legend(&graph)}
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res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
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}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}