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// Copyright 2019 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.
// colors just displays a single centered rectangle that should pulse
// through available colors. It uses the RGB color cube, bumping at
// predefined larger intervals (values of about 8) in order that the
// changes happen quickly enough to be appreciable.
//
// Press ESC to exit the program.
package main
import (
"fmt"
"math/rand"
"os"
"time"
"github.com/gdamore/tcell"
)
var red = int32(rand.Int() % 256)
var grn = int32(rand.Int() % 256)
var blu = int32(rand.Int() % 256)
var inc = int32(8) // rate of color change
var redi = int32(inc)
var grni = int32(inc)
var blui = int32(inc)
func makebox(s tcell.Screen) {
w, h := s.Size()
if w == 0 || h == 0 {
return
}
glyphs := []rune{'@', '#', '&', '*', '=', '%', 'Z', 'A'}
lh := h / 2
lw := w / 2
lx := w / 4
ly := h / 4
st := tcell.StyleDefault
gl := ' '
if s.Colors() == 0 {
st = st.Reverse(rand.Int()%2 == 0)
gl = glyphs[rand.Int()%len(glyphs)]
} else {
red += redi
if (red >= 256) || (red < 0) {
redi = -redi
red += redi
}
grn += grni
if (grn >= 256) || (grn < 0) {
grni = -grni
grn += grni
}
blu += blui
if (blu >= 256) || (blu < 0) {
blui = -blui
blu += blui
}
st = st.Background(tcell.NewRGBColor(red, grn, blu))
}
for row := 0; row < lh; row++ {
for col := 0; col < lw; col++ {
s.SetCell(lx+col, ly+row, st, gl)
}
}
s.Show()
}
func flipcoin() bool {
if rand.Int()&1 == 0 {
return false
}
return true
}
func main() {
rand.Seed(time.Now().UnixNano())
tcell.SetEncodingFallback(tcell.EncodingFallbackASCII)
s, e := tcell.NewScreen()
if e != nil {
fmt.Fprintf(os.Stderr, "%v\n", e)
os.Exit(1)
}
if e = s.Init(); e != nil {
fmt.Fprintf(os.Stderr, "%v\n", e)
os.Exit(1)
}
s.SetStyle(tcell.StyleDefault.
Foreground(tcell.ColorBlack).
Background(tcell.ColorWhite))
s.Clear()
quit := make(chan struct{})
go func() {
for {
ev := s.PollEvent()
switch ev := ev.(type) {
case *tcell.EventKey:
switch ev.Key() {
case tcell.KeyEscape, tcell.KeyEnter:
close(quit)
return
case tcell.KeyCtrlL:
s.Sync()
}
case *tcell.EventResize:
s.Sync()
}
}
}()
cnt := 0
dur := time.Duration(0)
loop:
for {
select {
case <-quit:
break loop
case <-time.After(time.Millisecond * 50):
}
start := time.Now()
makebox(s)
dur += time.Now().Sub(start)
cnt++
if cnt%(256/int(inc)) == 0 {
if flipcoin() {
redi = -redi
}
if flipcoin() {
grni = -grni
}
if flipcoin() {
blui = -blui
}
}
}
s.Fini()
fmt.Printf("Finished %d boxes in %s\n", cnt, dur)
fmt.Printf("Average is %0.3f ms / box\n", (float64(dur)/float64(cnt))/1000000.0)
}
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