go-chart/_examples/scatter/main.go

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package main
import (
"log"
"net/http"
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_ "net/http/pprof"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/drawing"
)
func drawChart(res http.ResponseWriter, req *http.Request) {
viridisByY := func(xr, yr chart.Range, x, y float64) drawing.Color {
return chart.Viridis(y, yr.GetMin(), yr.GetMax())
}
graph := chart.Chart{
Series: []chart.Series{
chart.ContinuousSeries{
Style: chart.Style{
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Show: true,
StrokeWidth: chart.Disabled,
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DotWidth: 5,
DotColorProvider: viridisByY,
},
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XValues: chart.Sequence.Random(128, 1024),
YValues: chart.Sequence.Random(128, 1024),
},
},
}
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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.Box{IsSet: true},
},
Background: chart.Style{
Padding: chart.Box{IsSet: true},
},
Series: []chart.Series{
chart.ContinuousSeries{
XValues: chart.Sequence.Float64(0, 4, 1),
YValues: chart.Sequence.Float64(0, 4, 1),
},
},
}
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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))
}