go-chart/testserver/main.go

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package main
import (
"bytes"
"image/color"
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"log"
"time"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-web"
)
func main() {
app := web.New()
app.SetName("Chart Test Server")
app.SetLogger(web.NewStandardOutputLogger())
app.GET("/", func(rc *web.RequestContext) web.ControllerResult {
rc.Response.Header().Set("Content-Type", "image/png")
now := time.Now()
c := chart.Chart{
Title: "Stocks Bruh.",
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TitleStyle: chart.Style{
Show: true,
},
Width: 1024,
Height: 400,
Canvas: chart.Style{
Padding: chart.Box{
Right: 40,
Bottom: 40,
},
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},
Axes: chart.Style{
Show: true,
StrokeWidth: 1.0,
},
YRange: chart.Range{
Min: 0.0,
Max: 7.0,
},
FinalValueLabel: chart.Style{
Show: true,
},
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Series: []chart.Series{
chart.TimeSeries{
Name: "goog",
Style: chart.Style{
StrokeWidth: 1.0,
},
XValues: []time.Time{now.AddDate(0, 0, -4), now.AddDate(0, 0, -3), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)},
YValues: []float64{2.5, 5.0, 2.0, 3.0},
},
chart.TimeSeries{
Name: "aapl",
Style: chart.Style{
StrokeWidth: 1.0,
StrokeColor: color.RGBA{R: 0, G: 217, B: 116, A: 255},
},
XValues: []time.Time{now.AddDate(0, 0, -5), now.AddDate(0, 0, -4), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)},
YValues: []float64{3.0, 2.7, 2.0, 1.1},
},
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},
}
buffer := bytes.NewBuffer([]byte{})
err := c.Render(chart.PNG, buffer)
if err != nil {
return rc.API().InternalError(err)
}
return rc.Raw(buffer.Bytes())
})
log.Fatal(app.Start())
}