go-chart/_examples/benchmark_line_charts/main.go
2018-12-06 16:46:27 +01:00

80 lines
1.7 KiB
Go

// Usage: http://localhost:8080?series=100&values=1000
package main
import (
"fmt"
"math/rand"
"net/http"
"strconv"
"time"
"git.gutmet.org/go-chart.git"
)
func random(min, max float64) float64 {
return rand.Float64()*(max-min) + min
}
func drawLargeChart(res http.ResponseWriter, r *http.Request) {
numSeriesInt64, err := strconv.ParseInt(r.FormValue("series"), 10, 64)
if err != nil {
numSeriesInt64 = int64(1)
}
if numSeriesInt64 == 0 {
numSeriesInt64 = 1
}
numSeries := int(numSeriesInt64)
numValuesInt64, err := strconv.ParseInt(r.FormValue("values"), 10, 64)
if err != nil {
numValuesInt64 = int64(100)
}
if numValuesInt64 == 0 {
numValuesInt64 = int64(100)
}
numValues := int(numValuesInt64)
series := make([]chart.Series, numSeries)
for i := 0; i < numSeries; i++ {
xValues := make([]time.Time, numValues)
yValues := make([]float64, numValues)
for j := 0; j < numValues; j++ {
xValues[j] = time.Now().AddDate(0, 0, (numValues-j)*-1)
yValues[j] = random(float64(-500), float64(500))
}
series[i] = chart.TimeSeries{
Name: fmt.Sprintf("aaa.bbb.hostname-%v.ccc.ddd.eee.fff.ggg.hhh.iii.jjj.kkk.lll.mmm.nnn.value", i),
XValues: xValues,
YValues: yValues,
}
}
graph := chart.Chart{
XAxis: chart.XAxis{
Name: "Time",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
},
YAxis: chart.YAxis{
Name: "Value",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
},
Series: series,
}
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func main() {
http.HandleFunc("/", drawLargeChart)
http.HandleFunc("/favico.ico", func(res http.ResponseWriter, req *http.Request) {
res.Write([]byte{})
})
http.ListenAndServe(":8080", nil)
}