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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
//
// This build tag means that "go install golang.org/x/exp/shiny/..." doesn't
// install this example program. Use "go run main.go board.go xy.go" to run it.
// Goban is a simple example of a graphics program using shiny.
// It implements a Go board that two people can use to play the game.
// TODO: Improve the main function.
// TODO: Provide more functionality.
package main
import (
"flag"
"image"
"image/color"
stdDraw "image/draw"
"log"
"math/rand"
"time"
"golang.org/x/exp/shiny/driver"
"golang.org/x/exp/shiny/screen"
"golang.org/x/mobile/event/key"
"golang.org/x/mobile/event/mouse"
"golang.org/x/mobile/event/paint"
"golang.org/x/mobile/event/size"
)
var dirty bool
var uploading bool
var scale = flag.Int("scale", 35, "`percent` to scale images (TODO: a poor design)")
func main() {
flag.Parse()
rand.Seed(int64(time.Now().Nanosecond()))
board := NewBoard(9, *scale)
driver.Main(func(s screen.Screen) {
w, err := s.NewWindow(nil)
if err != nil {
log.Fatal(err)
}
defer w.Release()
r := board.image.Bounds()
winSize := r.Size()
var b screen.Buffer
defer func() {
if b != nil {
b.Release()
}
}()
var sz size.Event
for e := range w.Events() {
switch e := e.(type) {
default:
case mouse.Event:
if e.Direction == mouse.DirRelease && e.Button != 0 {
// Invert y. TODO: for Darwin gldriver bug that will be fixed by https://go-review.googlesource.com/#/c/13917/
y := b.RGBA().Bounds().Dy() - int(e.Y)
board.click(b.RGBA(), int(e.X), y, int(e.Button))
dirty = true
}
case key.Event:
if e.Code == key.CodeEscape {
return
}
case paint.Event:
// TODO: This check should save CPU time but causes flicker on Darwin.
//if dirty && !uploading {
w.Fill(sz.Bounds(), color.RGBA{0x00, 0x00, 0x3f, 0xff}, stdDraw.Src)
w.Upload(image.Point{0, 0}, b, b.Bounds(), w) // TODO: On Darwin always writes to 0,0, ignoring first arg.
dirty = false
uploading = true
//}
w.EndPaint(e)
case screen.UploadedEvent:
// No-op.
uploading = false
case size.Event:
// TODO: Set board size.
sz = e
if b != nil {
b.Release()
}
winSize = image.Point{sz.WidthPx, sz.HeightPx}
b, err = s.NewBuffer(winSize)
if err != nil {
log.Fatal(err)
}
render(b.RGBA(), board)
case error:
log.Print(e)
}
}
})
}
func render(m *image.RGBA, board *Board) {
board.Draw(m)
dirty = true
}
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