Module: ImmosquareColors

Defined in:
lib/immosquare-colors.rb,
lib/immosquare-colors/version.rb

Constant Summary collapse

VERSION = 
"0.1.5".freeze

Class Method Summary collapse

Class Method Details

.color_name_to_hex(color_name) ⇒ Object

##

A dictionary for mapping textual colors to colors hex

##


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# File 'lib/immosquare-colors.rb', line 63

def color_name_to_hex(color_name)
  ImmosquareConstants::Color.color_name_to_hex(color_name.downcase.to_sym) || "#000000"
end

.get_complementary_color(color, options = {}) ⇒ Object

##

To determine whether the complementary color should be black or white

##


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# File 'lib/immosquare-colors.rb', line 10

def get_complementary_color(color, options = {})
  begin
    luminance_std = (options[:luminance] || 127.5).to_f
    black         = "#000000"
    white         = "#FFFFFF"
    color_hex     = color.start_with?("#") ? color : color_name_to_hex(color)

    raise("Not valid size") if ![7, 9].include?(color_hex.length)


    color_rgba = hex_to_rgba(color_hex)
    r, g, b, a = color_rgba

    ##============================================================##
    ## luminance calculation
    ##============================================================##
    luminance = Math.sqrt((0.299 * (r**2)) + (0.587 * (g**2)) + (0.114 * (b**2)))
    luminance > luminance_std ? black : white
  rescue StandardError => e
    puts("=== Error! ===")
    puts(e.message)
    puts(e.backtrace)
    black
  end
end

.hex_to_rgba(hex_color) ⇒ Object

##

To transform a hex color to rgba

##


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# File 'lib/immosquare-colors.rb', line 39

def hex_to_rgba(hex_color)
  hex_color   = hex_color.gsub("#", "")
  red         = hex_color[0..1].to_i(16)
  green       = hex_color[2..3].to_i(16)
  blue        = hex_color[4..5].to_i(16)
  rgba        = [red, green, blue]
  rgba += [(hex_color[6..7].to_i(16) / 255.0).round(2)] if hex_color.length == 8
  rgba
end

.rgba_to_hex(rgba_color) ⇒ Object

##

To transform a rgba color (array) to hex

##


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# File 'lib/immosquare-colors.rb', line 52

def rgba_to_hex(rgba_color)
  r, g, b, a = rgba_color
  hex_string = format("#%02x%02x%02x", r, g, b)
  hex_string += format("%02x", (a * 255).floor) if a && a != 1.0
  hex_string.upcase
end

.shade_color(color, weight) ⇒ Object

##

Mix color whith black (0, 0, 0)

##


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# File 'lib/immosquare-colors.rb', line 82

def shade_color(color, weight)
  color_hex   = color.start_with?("#") ? color : color_name_to_hex(color)
  r, g, b, a  = hex_to_rgba(color_hex)
  shaded_r    = (r * (1 - weight)).round
  shaded_g    = (g * (1 - weight)).round
  shaded_b    = (b * (1 - weight)).round
  rgba_to_hex([shaded_r, shaded_g, shaded_b, a])
end

.tint_color(color, weight) ⇒ Object

##

Mix color whith white (255, 255, 255)

##


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# File 'lib/immosquare-colors.rb', line 70

def tint_color(color, weight)
  color_hex   = color.start_with?("#") ? color : color_name_to_hex(color)
  r, g, b, a  = hex_to_rgba(color_hex)
  tinted_r    = (((1 - weight) * r) + (weight * 255)).round
  tinted_g    = (((1 - weight) * g) + (weight * 255)).round
  tinted_b    = (((1 - weight) * b) + (weight * 255)).round
  rgba_to_hex([tinted_r, tinted_g, tinted_b, a])
end