mth/ebiten
1
0
Fork 0
mirror of https://github.com/hajimehoshi/ebiten.git synced 2024-12-24 18:58:54 +01:00
Code Issues Packages Projects Releases Wiki Activity

examples/piano: Refactoring

Browse Source
This commit is contained in:
Hajime Hoshi 2018-01-08 22:44:15 +09:00
parent b30703eb00
commit 2dab8ccc6e
1 changed files with 2 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
examples/piano/main.go
View File

@ -49,16 +49,13 @@ var pcm = make([]float64, 4*sampleRate)
const baseFreq = 220
func init() {
const twoPiF = 2.0 * math.Pi * baseFreq
s := float64(sampleRate)
amp := []float64{1.0, 0.8, 0.6, 0.4, 0.2}
x := []float64{4.0, 2.0, 1.0, 0.5, 0.25}
for i := 0; i < len(pcm); i++ {
v := 0.0
for j := 0; j < len(amp); j++ {
a := amp[j] * math.Exp(-5*float64(i)/(x[j]*s))
v += a * math.Sin(float64(i)*twoPiF*float64(j+1)/s)
a := amp[j] * math.Exp(-5*float64(i)/(x[j]*sampleRate))
v += a * math.Sin(2.0*math.Pi*float64(i)*baseFreq*float64(j+1)/sampleRate)
}
pcm[i] = v / 5.0
}