72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package main
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import (
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"math/rand"
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"os"
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"time"
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chart "github.com/wcharczuk/go-chart"
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)
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func random(min, max float64) float64 {
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return rand.Float64()*(max-min) + min
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}
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func main() {
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/*
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This is an example of using `DetailsBox` to add a box with additional
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information about the graph.
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*/
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xValues := make([]time.Time, 0)
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yValues := make([][]float64, 3)
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for i := 0; i < 50; i++ {
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xValues = append(xValues, time.Now().Add(time.Duration(i)*time.Minute))
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for j := 0; j < 3; j++ {
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yValues[j] = append(yValues[j], random(float64(0), float64(20)))
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}
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}
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seriesOne := chart.TimeSeries{
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Name: "Series One",
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XValues: xValues,
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YValues: yValues[0],
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}
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seriesTwo := chart.TimeSeries{
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Name: "Series Two",
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XValues: xValues,
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YValues: yValues[1],
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}
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seriesThree := chart.TimeSeries{
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Name: "Series Three",
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XValues: xValues,
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YValues: yValues[2],
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}
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graph := chart.Chart{
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Series: []chart.Series{
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seriesOne,
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seriesTwo,
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seriesThree,
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},
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Background: chart.Style{
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Padding: chart.Box{
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Left: 120,
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},
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},
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}
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graph.Elements = []chart.Renderable{
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chart.LegendLeft(&graph),
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chart.DetailsBox(&graph, []string{
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"M-F 8:00 am - 6:00 pm",
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"Poll for data every 9 min.",
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}),
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}
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f, _ := os.Create("output.png")
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defer f.Close()
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graph.Render(chart.PNG, f)
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}
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