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package draw
var _ Pixels = &Quarter{}
const (
quarterScaleX = 2
quarterScaleY = 2
)
type Quarter struct{ *Buffer }
func (b *Quarter) Size() Box {
return Box{
Width: b.Width * quarterScaleX,
Height: b.Height * quarterScaleY,
}
}
func (b *Quarter) Set(y, x int) {
ry, cy := y/2, 1-y%2
rx, cx := x/2, x%2
i := index(b.Get(ry, rx))
b.Buffer.Set(ry, rx, runes[i|(1<<uint(cx+2*cy))])
}
func (b *Quarter) Clear() { b.Fill(runes[0]) }
var runes = []rune(" ▘▝▀▖▌▞▛▗▚▐▜▄▙▟█")
func index(r rune) int {
for i := range runes {
if runes[i] == r {
return i
}
}
return 0
}
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