75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package main
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// A simple Gio program. See https://gioui.org for more information.
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import (
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"fmt"
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"log"
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"time"
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"gioui.org/ui"
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"gioui.org/ui/app"
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"gioui.org/ui/layout"
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"gioui.org/ui/measure"
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"gioui.org/ui/text"
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"golang.org/x/image/font/gofont/goregular"
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"golang.org/x/image/font/sfnt"
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)
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func main() {
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go func() {
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w := app.NewWindow()
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if err := loop(w); err != nil {
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log.Fatal(err)
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}
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}()
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app.Main()
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}
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func loop(w *app.Window) error {
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regular, err := sfnt.Parse(goregular.TTF)
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if err != nil {
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panic("failed to load font")
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}
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var faces measure.Faces
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ops := new(ui.Ops)
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q := w.Queue()
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face := faces.For(regular, ui.Sp(16))
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lst := layout.List{Axis: layout.Vertical}
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times := make([]int64, 100)
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timesIndex := 0
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for {
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e := <-w.Events()
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switch e := e.(type) {
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case app.DestroyEvent:
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return e.Err
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case app.UpdateEvent:
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stime := time.Now()
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c := e.Config
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ops.Reset()
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faces.Reset(&c)
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for lst.Init(&c, q, ops, layout.RigidConstraints(e.Size), 200); lst.More(); lst.Next() {
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lst.End(text.Label{Face: face, Text: fmt.Sprintf("label %d",lst.Index())}.Layout(ops, lst.Constraints()))
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}
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lst.Layout()
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w.Update(ops)
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dur := time.Since(stime)
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//fmt.Printf("Frame time: %s\n", dur)
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times[timesIndex] = dur.Nanoseconds()
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timesIndex++
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if timesIndex == 100 {
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timesIndex = 0
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var avg int64
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for i := 0; i < 100; i++ {
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avg += times[i]
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}
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avg = avg / 100000
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fmt.Printf("Average frame time: %d microseconds\n", avg)
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}
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}
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}
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}
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