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package main
import (
"image"
"image/color"
"image/draw"
"log"
"math/rand"
"sync"
"time"
"github.com/faiface/gui"
"github.com/faiface/gui/win"
)
func Blinker(env gui.Env) {
defer func() {
if recover() != nil {
log.Print("recovered blinker")
}
}()
buf := make([]byte, 3)
rand.Read(buf)
defaultColor := image.NewUniform(color.RGBA{buf[0], buf[1], buf[2], 255})
rand.Read(buf)
blinkColor := image.NewUniform(color.RGBA{buf[0], buf[1], buf[2], 255})
redraw := func(r image.Rectangle, visible bool) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
if r == image.ZR {
return r
}
if visible {
draw.Draw(drw, r, defaultColor, image.ZP, draw.Src)
} else {
draw.Draw(drw, r, blinkColor, image.ZP, draw.Src)
}
return r
}
}
var mu sync.Mutex
var (
r image.Rectangle
visible bool = true
)
// first we draw a white rectangle
// env.Draw() <- redraw(b)
func() {
for event := range env.Events() {
switch event := event.(type) {
case win.MoDown:
if event.Point.In(r) {
go func() {
for i := 0; i < 6; i++ {
mu.Lock()
visible = !visible
env.Draw() <- redraw(r, visible)
mu.Unlock()
time.Sleep(time.Second / 3)
}
}()
}
case gui.Resize:
r = event.Rectangle
env.Draw() <- redraw(r, visible)
}
}
}()
}
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