Class: Rothko::Drawing

Inherits:
Object
  • Object
show all
Includes:
ChunkyPNG::Color
Defined in:
lib/rothko.rb

Constant Summary collapse

@@palette =

Pallette of default ANSI colors. Closest match is found from this hash, so these may be altered to produce a more faithful image or change colors.

{
  "g" => [0,230,22],
  "G" => [0,176,14],
  "w" => [230,229,230],
  "W" => [191,191,191],
  "r" => [252,0,0],
  "R" => [169,0,0],
  "k" => [102,102,102],
  "K" => [0,0,0],
  "m" => [255,0,228],
  "M" => [201,0,178],
  "c" => [0,236,234],
  "C" => [0,170,182],
  "b" => [70,0,255],
  "B" => [46,0,181],
  "y" => [223,237,0],
  "Y" => [149,158,0]
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, width) ⇒ Drawing

Takes in the path to the PNG file and the width (in ‘pixels’ - equivalent to two spaces)



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# File 'lib/rothko.rb', line 37

def initialize(path, width)
  input = ChunkyPNG::Image.from_file(path)
  @width = width
  @img = input.resample_nearest_neighbor(self.width, get_height(input))
  make_drawing
end

Instance Attribute Details

#img ⇒ Object

Returns the value of attribute img.



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# File 'lib/rothko.rb', line 9

def img
  @img
end

#palette ⇒ Object (readonly)

Returns the value of attribute palette.



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# File 'lib/rothko.rb', line 10

def palette
  @palette
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/rothko.rb', line 9

def width
  @width
end

Instance Method Details

#create_color_string ⇒ Object

Iterates over each pixel of resized image to find closest color



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# File 'lib/rothko.rb', line 57

def create_color_string
  (0...img.height).map do |y|
    (0...img.width).map do |x|
      pix = self.img[x,y]
      pix_vals = [r(pix), g(pix), b(pix)]
      find_closest_term_color(pix_vals)
    end
  end.join
end

#draw_line(pixels) ⇒ Object

Takes in a string of colors and puts them out as background colored spaces For example, “rGK” creates a light_red square, a green square, and a black square



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# File 'lib/rothko.rb', line 91

def draw_line(pixels)
  pix_line = ""
  pixels.each do |pixel|
    pix_line = pix_line + "  ".colorize(:background => find_color(pixel))
  end
  puts pix_line
end

#find_closest_term_color(pixel_values) ⇒ Object

Iterates over the palette to find the most similar color



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# File 'lib/rothko.rb', line 68

def find_closest_term_color(pixel_values)
  color = ""
  lil_dist = 195075
  @@palette.each do |col_name, col_values|
    dist = find_distance(col_values, pixel_values)
    if dist < lil_dist
      lil_dist = dist
      color = col_name
    end
  end
  color
end

#find_color(letter) ⇒ Object

Matches letters to colors



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# File 'lib/rothko.rb', line 100

def find_color(letter)
  case letter
  when "R"
    :red
  when "r"
    :light_red
  when "B"
    :blue
  when "b"
    :light_blue
  when "C"
    :cyan
  when "c"
    :light_cyan
  when "Y"
    :yellow
  when "y"
    :light_yellow
  when "G"
    :green
  when "g"
    :light_green
  when "K"
    :black
  when "k"
    :light_black
  when "W"
    :white
  when "w"
    :light_white
  when "M"
    :magenta
  when "m"
    :light_magenta
  else
    :white
  end
end

#find_distance(color1, color2) ⇒ Object

Helprt method



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# File 'lib/rothko.rb', line 82

def find_distance(color1, color2)
  delta_r = color1[0] - color2[0];
  delta_g = color1[1] - color2[1];
  delta_b = color1[2] - color2[2];
  delta_r * delta_r + delta_g * delta_g + delta_b * delta_b
end

#get_height(img) ⇒ Object

Finds height of the image relative to provided width



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# File 'lib/rothko.rb', line 52

def get_height(img)
  new_height = (img.height / (img.width.to_f / self.width.to_f)).ceil
end

#make_drawing ⇒ Object

Calls create_color_string to get an array of colors & split it into rows Then iterates over that array, calling draw_line on each row



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# File 'lib/rothko.rb', line 46

def make_drawing
  ln_arr = create_color_string.scan(/.{#{self.width}}/)
  ln_arr.each {|ln| draw_line(ln.split(""))}
end