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module UnicodePlot
class DensityCanvas < Canvas
Canvas::CANVAS_CLASS_MAP[:density] = self
DENSITY_SIGNS = [" ", "░", "▒", "▓", "█"].freeze
MIN_WIDTH = 5
MIN_HEIGHT = 5
X_PIXEL_PER_CHAR = 1
Y_PIXEL_PER_CHAR = 2
def initialize(width, height, **kw)
width = [width, MIN_WIDTH].max
height = [height, MIN_HEIGHT].max
@max_density = 1
super(width, height,
width * X_PIXEL_PER_CHAR,
height * Y_PIXEL_PER_CHAR,
0,
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
char_x = (pixel_x.fdiv(pixel_width) * width).floor
char_y = (pixel_y.fdiv(pixel_height) * height).floor
index = index_at(char_x, char_y)
@grid[index] += 1
@max_density = [@max_density, @grid[index]].max
@colors[index] |= COLOR_ENCODE[color]
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
den_sign_count = DENSITY_SIGNS.length
val_scale = (den_sign_count - 1).fdiv(@max_density)
(0 ... width).each do |x|
den_index = (char_at(x, y) * val_scale).round
print_color(out, color_at(x, y), DENSITY_SIGNS[den_index])
end
end
end
end
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