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module UnicodePlot
# The `BlockCanvas` is also Unicode-based.
# It has half the resolution of the `BrailleCanvas`.
# In contrast to BrailleCanvas, the pixels don't
# have visible spacing between them.
# This canvas effectively turns every character
# into 4 pixels that can individually be manipulated
# using binary operations.
class BlockCanvas < LookupCanvas
Canvas::CANVAS_CLASS_MAP[:block] = self
X_PIXEL_PER_CHAR = 2
Y_PIXEL_PER_CHAR = 2
def initialize(width, height, fill_char=0, **kw)
super(width, height,
X_PIXEL_PER_CHAR,
Y_PIXEL_PER_CHAR,
fill_char,
**kw)
end
BLOCK_SIGNS = [
[0b1000, 0b0010].freeze,
[0b0100, 0b0001].freeze
].freeze
BLOCK_DECODE = [
-' ', -'▗', -'▖', -'▄',
-'▝', -'▐', -'▞', -'▟',
-'▘', -'▚', -'▌', -'▙',
-'▀', -'▜', -'▛', -'█'
].freeze
def lookup_encode(x,y) ; BLOCK_SIGNS[x][y] ; end
def lookup_decode(x) ; BLOCK_DECODE[x] ; end
end
end
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