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//go:build ignore
// +build ignore
// Copyright 2022 The TCell Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// stress will fill the whole screen with random characters, colors and
// formatting. The frames are pre-generated to draw as fast as possible.
// ESC and Ctrl-C will end the program. Note that resizing isn't supported.
package main
import (
"fmt"
"math/rand"
"time"
"github.com/gdamore/tcell/v2"
)
func main() {
screen, err := tcell.NewScreen()
if err != nil {
panic(err)
}
if err := screen.Init(); err != nil {
panic(err)
}
var frames int
type cell struct {
c rune
style tcell.Style
}
width, height := screen.Size()
glyphs := []rune{'@', '#', '&', '*', '=', '%', 'Z', 'A'}
attrs := []tcell.AttrMask{tcell.AttrBold, tcell.AttrReverse, tcell.AttrItalic, tcell.AttrNone}
// Pre-Generate 100 different frame patterns, so we stress the terminal as
// much as possible :D
var patterns [][][]*cell
for i := 0; i < 100; i++ {
pattern := make([][]*cell, height)
for h := 0; h < height; h++ {
row := make([]*cell, width)
for w := 0; w < width; w++ {
rF := int32(rand.Int() % 256)
gF := int32(rand.Int() % 256)
bF := int32(rand.Int() % 256)
rB := int32(rand.Int() % 256)
gB := int32(rand.Int() % 256)
bB := int32(rand.Int() % 256)
row[w] = &cell{
c: glyphs[rand.Int()%len(glyphs)],
style: tcell.StyleDefault.
Attributes(attrs[rand.Int()%len(attrs)]).
Background(tcell.NewRGBColor(rB, gB, bB)).
Foreground(tcell.NewRGBColor(rF, gF, bF)),
}
}
pattern[h] = row
}
patterns = append(patterns, pattern)
}
evCh := make(chan tcell.Event)
quitCh := make(chan struct{})
go screen.ChannelEvents(evCh, quitCh)
startTime := time.Now()
loop:
for {
select {
case event := <-evCh:
if event, ok := event.(*tcell.EventKey); ok {
if event.Key() == tcell.KeyCtrlC || event.Key() == tcell.KeyESC {
close(quitCh)
break loop
}
}
break
default:
}
pattern := patterns[frames%len(patterns)]
for h := 0; h < height; h++ {
for w := 0; w < width; w++ {
c := pattern[h][w]
screen.SetContent(w, h, c.c, nil, c.style)
}
}
screen.Show()
frames++
}
duration := time.Since(startTime)
screen.Fini()
fps := int(float64(frames) / duration.Seconds())
fmt.Println("FPS:", fps)
}
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