mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
196 lines
4.4 KiB
Go
196 lines
4.4 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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"image/color"
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"log"
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"time"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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"github.com/hajimehoshi/ebiten/exp/audio"
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"github.com/hajimehoshi/ebiten/exp/audio/vorbis"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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playerBarImage *ebiten.Image
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playerCurrentImage *ebiten.Image
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)
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func init() {
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var err error
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playerBarImage, err = ebiten.NewImage(300, 4, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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playerBarImage.Fill(&color.RGBA{0x80, 0x80, 0x80, 0xff})
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playerCurrentImage, err = ebiten.NewImage(4, 10, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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playerCurrentImage.Fill(&color.RGBA{0xff, 0xff, 0xff, 0xff})
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}
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type Player struct {
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audioPlayer *audio.Player
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total time.Duration
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}
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var (
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audioContext *audio.Context
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player *Player
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playerCh = make(chan *Player)
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mouseButtonState = map[ebiten.MouseButton]int{}
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keyState = map[ebiten.Key]int{}
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)
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func playerBarRect() (x, y, w, h int) {
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w, h = playerBarImage.Size()
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x = (screenWidth - w) / 2
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y = screenHeight - h - 16
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return
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}
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func (p *Player) updatePlayPause() error {
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if p.audioPlayer == nil {
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return nil
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}
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if !ebiten.IsKeyPressed(ebiten.KeyS) {
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keyState[ebiten.KeyS] = 0
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return nil
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}
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keyState[ebiten.KeyS]++
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if keyState[ebiten.KeyS] != 1 {
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return nil
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}
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if p.audioPlayer.IsPlaying() {
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return p.audioPlayer.Pause()
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}
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return p.audioPlayer.Play()
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}
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func (p *Player) updateBar() error {
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if p.audioPlayer == nil {
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return nil
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}
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if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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mouseButtonState[ebiten.MouseButtonLeft] = 0
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return nil
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}
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mouseButtonState[ebiten.MouseButtonLeft]++
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if mouseButtonState[ebiten.MouseButtonLeft] != 1 {
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return nil
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}
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x, y := ebiten.CursorPosition()
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bx, by, bw, bh := playerBarRect()
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if y < by || by+bh <= y {
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return nil
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}
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if x < bx || bx+bw <= x {
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return nil
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}
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pos := time.Duration(x-bx) * p.total / time.Duration(bw)
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return p.audioPlayer.Seek(pos)
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}
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func update(screen *ebiten.Image) error {
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audioContext.Update()
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if player == nil {
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select {
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case player = <-playerCh:
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default:
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}
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}
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if player != nil {
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if err := player.updateBar(); err != nil {
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return err
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}
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if err := player.updatePlayPause(); err != nil {
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return err
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}
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}
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op := &ebiten.DrawImageOptions{}
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x, y, w, h := playerBarRect()
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op.GeoM.Translate(float64(x), float64(y))
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screen.DrawImage(playerBarImage, op)
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currentTimeStr := "00:00"
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if player != nil {
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c := player.audioPlayer.Current()
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// Current Time
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m := (c / time.Minute) % 100
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s := (c / time.Second) % 60
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currentTimeStr = fmt.Sprintf("%02d:%02d", m, s)
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// Bar
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cw, ch := playerCurrentImage.Size()
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cx := int(time.Duration(w)*c/player.total) + x - cw/2
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cy := y - (ch-h)/2
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(cx), float64(cy))
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screen.DrawImage(playerCurrentImage, op)
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}
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msg := fmt.Sprintf(`FPS: %0.2f
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Press S to toggle Play/Pause
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%s`, ebiten.CurrentFPS(), currentTimeStr)
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if player == nil {
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msg += "\nNow Loading..."
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}
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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// Use a FLAC file so far: I couldn't find any good OGG/Vorbis decoder in pure Go.
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f, err := ebitenutil.OpenFile("_resources/audio/ragtime.ogg")
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if err != nil {
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log.Fatal(err)
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}
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// TODO: sampleRate should be obtained from the ogg file.
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audioContext = audio.NewContext(22050)
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// TODO: This doesn't work synchronously on browsers because of decoding. Fix this.
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go func() {
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s, err := vorbis.Decode(audioContext, f)
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if err != nil {
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log.Fatal(err)
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return
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}
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p, err := audioContext.NewPlayer(s)
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if err != nil {
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log.Fatal(err)
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return
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}
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playerCh <- &Player{
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audioPlayer: p,
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total: s.Len(),
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}
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close(playerCh)
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p.Play()
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}()
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Audio (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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