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module UnicodePlot
class LookupCanvas < Canvas
def initialize(width, height, x_pixel_per_char, y_pixel_per_char, fill_char=0, **kw)
super(width, height,
width * x_pixel_per_char,
height * y_pixel_per_char,
fill_char,
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] |= lookup_encode(char_x_off - 1, char_y_off - 1)
@colors[index] |= COLOR_ENCODE[color]
end
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), lookup_decode(char_at(x, y)))
end
end
end
end
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