termui/_examples/piechart.go

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// +build ignore
package main
import (
"fmt"
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"log"
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"math"
"math/rand"
"time"
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ui "github.com/gizak/termui/v3"
"github.com/gizak/termui/v3/widgets"
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)
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var run = true
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func main() {
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if err := ui.Init(); err != nil {
log.Fatalf("failed to initialize termui: %v", err)
}
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defer ui.Close()
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rand.Seed(time.Now().UTC().UnixNano())
randomDataAndOffset := func() (data []float64, offset float64) {
noSlices := 1 + rand.Intn(5)
data = make([]float64, noSlices)
for i := range data {
data[i] = rand.Float64()
}
offset = 2.0 * math.Pi * rand.Float64()
return
}
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pc := widgets.NewPieChart()
pc.Title = "Pie Chart"
pc.SetRect(5, 5, 70, 36)
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pc.Data = []float64{.25, .25, .25, .25}
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pc.AngleOffset = -.5 * math.Pi
pc.LabelFormatter = func(i int, v float64) string {
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return fmt.Sprintf("%.02f", v)
}
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pause := func() {
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run = !run
if run {
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pc.Title = "Pie Chart"
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} else {
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pc.Title = "Pie Chart (Stopped)"
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}
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ui.Render(pc)
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}
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ui.Render(pc)
uiEvents := ui.PollEvents()
ticker := time.NewTicker(time.Second).C
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for {
select {
case e := <-uiEvents:
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switch e.ID {
case "q", "<C-c>":
return
case "s":
pause()
}
case <-ticker:
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if run {
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pc.Data, pc.AngleOffset = randomDataAndOffset()
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ui.Render(pc)
}
}
}
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}