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package main
import (
"image"
"image/draw"
"log"
"time"
"github.com/faiface/gui"
"github.com/faiface/gui/win"
"golang.org/x/image/colornames"
)
func Blinker(env gui.Env) {
defer func() {
if recover() != nil {
log.Print("recovered blinker")
}
}()
var r image.Rectangle
var visible bool = true
redraw := func() func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
if visible {
draw.Draw(drw, r, image.White, image.ZP, draw.Src)
} else {
draw.Draw(drw, r, &image.Uniform{colornames.Firebrick}, image.ZP, draw.Src)
}
return r
}
}
// first we draw a white rectangle
env.Draw() <- redraw()
func() {
for event := range env.Events() {
switch event := event.(type) {
case win.MoDown:
if event.Point.In(r) {
go func() {
for i := 0; i < 3; i++ {
visible = false
env.Draw() <- redraw()
time.Sleep(time.Second / 3)
visible = true
env.Draw() <- redraw()
time.Sleep(time.Second / 3)
}
}()
}
case gui.Resize:
log.Print(event)
r = event.Rectangle
env.Draw() <- redraw()
}
}
}()
}
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