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examples/keyboard: Add comments

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This commit is contained in:
Hajime Hoshi 2018-01-29 01:35:14 +09:00
parent 0fd8afd495
commit ac936f31b9
1 changed files with 19 additions and 11 deletions
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30
examples/keyboard/main.go
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@ -71,15 +71,7 @@ var keyNames = map[ebiten.Key]string{
}
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
const offsetX, offsetY = 24, 40
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(offsetX, offsetY)
op.ColorM.Scale(0.5, 0.5, 0.5, 1)
screen.DrawImage(keyboardImage, op)
// Collect pressed keys' names.
pressed := []string{}
for i := 0; i <= 9; i++ {
if ebiten.IsKeyPressed(ebiten.Key(i) + ebiten.Key0) {
@ -87,12 +79,12 @@ func update(screen *ebiten.Image) error {
}
}
for c := 'A'; c <= 'Z'; c++ {
if ebiten.IsKeyPressed(ebiten.Key(c) - 'A' + ebiten.KeyA) {
if ebiten.IsKeyPressed(ebiten.KeyA + ebiten.Key(c-'A')) {
pressed = append(pressed, string(c))
}
}
for i := 1; i <= 12; i++ {
if ebiten.IsKeyPressed(ebiten.Key(i) + ebiten.KeyF1 - 1) {
if ebiten.IsKeyPressed(ebiten.KeyF1 + ebiten.Key(i-1)) {
pressed = append(pressed, "F"+strconv.Itoa(i))
}
}
@ -102,6 +94,22 @@ func update(screen *ebiten.Image) error {
}
}
if ebiten.IsRunningSlowly() {
return nil
}
const (
offsetX = 24
offsetY = 40
)
// Draw the base (grayed) keyboard image.
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(offsetX, offsetY)
op.ColorM.Scale(0.5, 0.5, 0.5, 1)
screen.DrawImage(keyboardImage, op)
// Draw the highlighted keys.
op = &ebiten.DrawImageOptions{}
for _, p := range pressed {
op.GeoM.Reset()