class UnicodePlot::LookupCanvas

Public Class Methods

new(width, height, x_pixel_per_char, y_pixel_per_char, fill_char=0, **kw) click to toggle source
Calls superclass method UnicodePlot::Canvas::new
# File lib/unicode_plot/canvas/lookup_canvas.rb, line 3
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

Public Instance Methods

pixel!(pixel_x, pixel_y, color) click to toggle source
# File lib/unicode_plot/canvas/lookup_canvas.rb, line 13
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
print_row(out, row_index) click to toggle source