Class: RGhost::Color

Inherits:
PsObject show all
Includes:
RubyToPs
Defined in:
lib/rghost/color.rb

Overview

Creates color for postscript components

Direct Known Subclasses

CMYK, CMYKSpot, Gray, RGB

Constant Summary

Constants included from RubyToPs

RubyToPs::UTF8_ENCODINGS

Class Method Summary collapse

Methods included from RubyToPs

#array_to_stack, #hash_to_array, #pack_string, #ps_escape, #string_eval, #to_array, #to_bool, #to_string, #to_string_array

Methods inherited from PsObject

#<<, #call, #graphic_scope, #initialize, #ps, #raw, #set, #to_s

Constructor Details

This class inherits a constructor from RGhost::PsObject

Class Method Details

.create(color = "FFAA99") ⇒ Object

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



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# File 'lib/rghost/color.rb', line 35

def self.create(color="FFAA99")
  
  return case color
  when String then RGhost::RGB.new(color)
  when Symbol then
      c=RGhost::Constants::Colors::RGB[color]
    raise ArgumentError.new("#{color}##{color.class}") unless c 
    self.create c
       
  when Array, Hash then
      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