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module UnicodePlot
class BrailleCanvas < Canvas
Canvas::CANVAS_CLASS_MAP[:braille] = self
X_PIXEL_PER_CHAR = 2
Y_PIXEL_PER_CHAR = 4
BRAILLE_SIGNS = [
[
0x2801,
0x2802,
0x2804,
0x2840,
].freeze,
[
0x2808,
0x2810,
0x2820,
0x2880
].freeze
].freeze
def initialize(width, height, **kw)
super(width, height,
width * X_PIXEL_PER_CHAR,
height * Y_PIXEL_PER_CHAR,
"\u{2800}",
x_pixel_per_char: X_PIXEL_PER_CHAR,
y_pixel_per_char: Y_PIXEL_PER_CHAR,
**kw)
end
def pixel!(pixel_x, pixel_y, color)
unless 0 <= pixel_x && pixel_x <= pixel_width &&
0 <= pixel_y && pixel_y <= pixel_height
return color
end
pixel_x -= 1 unless pixel_x < pixel_width
pixel_y -= 1 unless pixel_y < pixel_height
tx = pixel_x.fdiv(pixel_width) * width
char_x = tx.floor + 1
char_x_off = pixel_x % X_PIXEL_PER_CHAR + 1
char_x += 1 if char_x < tx.round + 1 && char_x_off == 1
char_y_off = pixel_y % Y_PIXEL_PER_CHAR + 1
char_y = ((pixel_y - (char_y_off - 1)) / Y_PIXEL_PER_CHAR) + 1
index = index_at(char_x - 1, char_y - 1)
if index
@grid[index] = (@grid[index].ord | BRAILLE_SIGNS[char_x_off - 1][char_y_off - 1]).chr(Encoding::UTF_8)
@colors[index] |= COLOR_ENCODE[color]
end
color
end
def print_row(out, row_index)
unless 0 <= row_index && row_index < height
raise ArgumentError, "row_index out of bounds"
end
y = row_index
(0 ... width).each do |x|
print_color(out, color_at(x, y), char_at(x, y))
end
end
end
end
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