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docs: Add example/piano
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Hajime Hoshi
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@ -158,6 +158,7 @@ var examples = []example{
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{Name: "mosaic"},
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{Name: "paint"},
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{Name: "perspective"},
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{Name: "piano"},
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{Name: "rotate"},
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{Name: "blocks"},
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}
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39
_docs/public/example/piano.content.html
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39
_docs/public/example/piano.content.html
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@ -0,0 +1,39 @@
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<!DOCTYPE html>
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<!--
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Copyright 2015 Hajime Hoshi
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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-->
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<script>
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'use strict';
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window.addEventListener('load', function() {
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function isProduction() {
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var l = window.top.location;
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if (l.hash === '#_production') {
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return true;
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}
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if (l.hostname === 'localhost' || l.hostname === '127.0.0.1') {
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return false;
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}
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return true;
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}
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var s = document.createElement('script');
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var src = 'piano.js';
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if (isProduction()) {
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src = 'http://hajimehoshi.github.io/ebiten.pagestorage/master/' + src;
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}
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s.src = src;
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document.body.appendChild(s);
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});
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</script>
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174
_docs/public/example/piano.html
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174
_docs/public/example/piano.html
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@ -0,0 +1,174 @@
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<!DOCTYPE html>
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<!--
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Copyright 2015 Hajime Hoshi
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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-->
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - piano</title>
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<style>
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body {
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font-family: sans-serif;
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}
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iframe {
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border-color: #999;
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border-style: solid;
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border-width: 1px;
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overflow: hidden;
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}
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pre {
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background: #eee;
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padding: 1em;
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}
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</style>
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<nav><a href="..">Ebiten</a></nav>
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<h1>Ebiten example - piano</h1>
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<iframe src="piano.content.html" width="640" height="480"></iframe>
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<pre><code>package main
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import (
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"fmt"
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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/example/common"
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"github.com/hajimehoshi/ebiten/exp/audio"
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"image/color"
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"log"
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"math"
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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 pcm = make([]float64, 4*audio.SampleRate())
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const baseFreq = 220
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func init() {
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s := float64(audio.SampleRate())
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amp := []float64{1.0, 0.8, 0.6, 0.4, 0.2}
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x := []float64{4.0, 2.0, 1.0, 0.5, 0.25}
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for i := 0; i < len(pcm); i++ {
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v := 0.0
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twoPiF := 2.0 * math.Pi * baseFreq
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for j := 0; j < len(amp); j++ {
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a := amp[j] * math.Exp(-5*float64(i)/(x[j]*s))
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v += a * math.Sin(float64(i)*twoPiF*float64(j+1)/s)
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}
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pcm[i] = v / 5.0
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}
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}
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func addNote(freq float64, vol float64) {
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f := int(freq)
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length := len(pcm) * baseFreq / f
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l := make([]int16, length)
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r := make([]int16, length)
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j := 0
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jj := 0
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for i := 0; i < len(l); i++ {
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p := pcm[j]
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l[i] = int16(p * vol * math.MaxInt16)
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r[i] = l[i]
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jj += f
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j = jj / baseFreq
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}
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audio.Play(-1, l, r)
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}
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var keys = []ebiten.Key{
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ebiten.KeyQ,
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ebiten.KeyA,
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ebiten.KeyW,
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ebiten.KeyS,
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ebiten.KeyD,
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ebiten.KeyR,
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ebiten.KeyF,
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ebiten.KeyT,
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ebiten.KeyG,
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ebiten.KeyH,
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ebiten.KeyU,
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ebiten.KeyJ,
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ebiten.KeyI,
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ebiten.KeyK,
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ebiten.KeyO,
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ebiten.KeyL,
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}
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var keyStates = map[ebiten.Key]int{}
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func init() {
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for _, key := range keys {
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keyStates[key] = 0
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}
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}
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func updateInput() {
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for _, key := range keys {
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if !ebiten.IsKeyPressed(key) {
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keyStates[key] = 0
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continue
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}
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keyStates[key]++
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}
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}
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func update(screen *ebiten.Image) error {
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updateInput()
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for i, key := range keys {
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if keyStates[key] != 1 {
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continue
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}
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addNote(220*math.Exp2(float64(i-1)/12.0), 1.0)
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}
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screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})
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whiteKeys := []string{"A", "S", "D", "F", "G", "H", "J", "K", "L"}
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width := 24
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y := 48
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for i, k := range whiteKeys {
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x := i*width + 36
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height := 112
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screen.DrawFilledRect(x, y, width-1, height, color.White)
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common.ArcadeFont.DrawText(screen, k, x+8, y+height-16, 1, color.Black)
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}
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blackKeys := []string{"Q", "W", "", "R", "T", "", "U", "I", "O"}
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for i, k := range blackKeys {
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if k == "" {
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continue
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}
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x := i*width + 24
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height := 64
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screen.DrawFilledRect(x, y, width-1, height, color.Black)
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common.ArcadeFont.DrawText(screen, k, x+8, y+height-16, 1, color.White)
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}
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ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()))
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Piano (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre>
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<footer>© 2015 Hajime Hoshi</footer>
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@ -72,6 +72,8 @@ pre {
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<a href="example/perspective.html"><img src="images/example/perspective.png" width="320" height="240" alt="Ebiten example: perspective" class="example"></a>
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<a href="example/piano.html"><img src="images/example/piano.png" width="320" height="240" alt="Ebiten example: piano" class="example"></a>
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<a href="example/rotate.html"><img src="images/example/rotate.png" width="320" height="240" alt="Ebiten example: rotate" class="example"></a>
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<a href="example/blocks.html"><img src="images/example/blocks.png" width="256" height="240" alt="Ebiten example: blocks" class="example"></a>
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