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require "rghost/ps_object"
require "rghost/constants"
require "rghost/ruby_to_ps" # array_to_stack
# Creates color for postscript components
class RGhost::Color < RGhost::PsObject
include RGhost::RubyToPs
# The method create is a color factory depends when parameter is used. The parameter variate between 0 and 1, if value greatet that 1 will be divided by 100.0 .
#===Examples
#====Creating RGB color
# String HTML color converter
# Color.create '#FFAA33'
# As Symbol will be find in RGhost::Constants::Colors::RGB
# Color.create :red
# As Array with 3 elements
# Color.create [0.5, 0.3, 0.5]
# Hash with 3 pair of key/value. Valids keys :red, :green and :blue
# Color.create :red => 0.5, :green => 0.3, :blue => 0.5
# Hash with 3 pair of key/value. Valids keys :r, :g and :b
# Color.create :r => 0.5, :g => 0.3, :b => 0.5
#====Creating CMYK color
# Hash with 4 pair of key/value. Valids keys :cyan, :magenta, :yellow and :black
# Color.create :cyan=> 1 ,:magenta => 0.3, :yellow => 0, :black => 0
# Hash with 4 pair of key/value. Valids keys :c, :m, :y and :b
# Color.create :c=> 1 ,:m => 0.3, :y => 0, :b => 0
#====Creating CMYK Spot color
# Hash with 5 pair of key/value. Valids keys :cyan, :magenta, :yellow, :black, and :name
# Color.create :cyan=> 0, :magenta => 100, :yellow => 63, :black => 12, :name => 'Pantone 200 C'
#====Creating Gray color
# A single Numeric
# Color.create 0.5
# 50 percent of black will be divided by 100.0
# Color.create 50
def self.create(color = "FFAA99")
case color
when String then RGhost::RGB.new(color)
when Symbol
c = RGhost::Constants::Colors::RGB[color]
raise ArgumentError.new("#{color}##{color.class}") unless c
create c
when Array, Hash
if color.size == 3
RGhost::RGB.new(color)
elsif color.size == 4
RGhost::CMYK.new(color)
elsif color.size == 5
RGhost::CMYKSpot.new(color)
else
raise ArgumentError.new("#{color}##{color.class}")
end
when Numeric then RGhost::Gray.new(color)
else
raise ArgumentError.new("#{color}##{color.class}")
end
end
end
# Creates RGB color
class RGhost::RGB < RGhost::Color
attr_accessor :red, :green, :blue
CONSTANTS = RGhost::Constants::Colors::RGB
DEFAULT_RGB = {red: 0, green: 0, blue: 0}
# String HTML color converter
# Color.create '#FFAA33'
# As Symbol will be find in RGhost::Constants::Colors::RGB
# Color.create :red
# As Array with 3 elements
# Color.create [0.5, 0.3, 0.5]
# Hash with 3 pair of key/value. Valids keys :red, :green and :blue
# Color.create :red => 0.5, :green => 0.3, :blue => 0.5
# Hash with 3 pair of key/value. Valids keys :r, :g and :b
# Color.create :r => 0.5, :g => 0.3, :b => 0.5
def initialize(color_or_red = nil, green = nil, blue = nil)
@color = color_or_red
@color = [color_or_red.to_f, green.to_f, blue.to_f] if color_or_red.is_a? Numeric
@color = DEFAULT_RGB.merge(color_or_red) if color_or_red.is_a? Hash
end
def ps
value = color_params
array_to_stack(value.map { |n| (n > 1) ? n / 100.0 : n }) + "setrgbcolor"
end
def stack_format
color_params
end
def color_params
case @color
when Hash then [@color[:r] || @color[:red], @color[:g] || @color[:green], @color[:b] || @color[:blue]]
when Array then @color
when String then hex_to_rgb(@color)
when NilClass then [0, 0, 1]
end
end
def hex_to_rgb(color = "#FFFFFF")
color.delete("#").scan(/[\dA-F]{2}/).map { |h| h.hex / 255.0 }
end
end
# Creates CMYK color space
class RGhost::CMYK < RGhost::Color
attr_accessor :cyan, :magenta, :yellow, :black
CONSTANTS = RGhost::Constants::Colors::CMYK
# Hash with 4 pair of key/value. Valids keys :cyan, :magenta, :yellow and :black
# Color.create :cyan=> 1 ,:magenta => 0.3, :yellow => 0, :black => 0
# Hash with 4 pair of key/value. Valids keys :c, :m, :y and :b
# Color.create :c=> 1 ,:m => 0.3, :y => 0, :b => 0
def initialize(color = {cyan: 1, magenta: 0, yellow: 0, black: 0})
@color = color
end
def ps
value = case @color
when Hash then [@color[:c] || @color[:cyan], @color[:m] || @color[:magenta], @color[:y] || @color[:yellow], @color[:k] || @color[:black]]
when Array then @color
end
array_to_stack(value.map { |n| (n > 1) ? n / 100.0 : n }) + "setcmykcolor"
end
end
# Creates CMYK Spot color space
class RGhost::CMYKSpot < RGhost::Color
attr_accessor :cyan, :magenta, :yellow, :black, :name
def initialize(color = {name: "spot", cyan: 1, magenta: 0, yellow: 0, black: 0})
@name = color[:name]
color.delete(:name)
@color = color
end
def ps
value = case @color
when Hash then [@color[:c] || @color[:cyan], @color[:m] || @color[:magenta], @color[:y] || @color[:yellow], @color[:k] || @color[:black]]
when Array then @color
end
array_to_stack(value.map { |n| (n > 1) ? n / 100.0 : n }) + "(#{@name}) findcmykcustomcolor \n/#{@name.to_s.tr(" ", "_")} exch def\n\n#{@name.to_s.tr(" ", "_")} 1 setcustomcolor"
end
end
# Creates Gray color
class RGhost::Gray < RGhost::Color
attr_accessor :gray
# A single Numeric
# Color.create 0.5
# 50 percent of black will be divided by 100.0
# Color.create 50
def initialize(gray = 0.8)
@gray = gray
end
def ps # :nodoc:
@gray /= 100.0 if @gray > 1
"#{@gray} setgray"
end
end
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