Module: Workbench::ColorHelper

Defined in:
app/helpers/workbench/color_helper.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.hexstr_to_signed32int(hexstr) ⇒ Object

From mx from bytes.com/topic/perl/answers/693973-converting-hex-string-32-bit-signed-integer



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# File 'app/helpers/workbench/color_helper.rb', line 17

def self.hexstr_to_signed32int(hexstr) 
  #   return nil if hexstr =~ /^[0-9A-Fa-f]{1,8}$/
  num = hexstr.to_i(16)
  return (num > 31 ? num - 2 ** 32 : num)
end

.ranged_color(v = 0.0, c = 'blue') ⇒ Object

wow division is odd in Ruby! (.to_f)



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# File 'app/helpers/workbench/color_helper.rb', line 32

def self.ranged_color(v = 0.0, c = 'blue')
  n =  240 - (v * 240).to_i 
  case c
  when 'blue'
    "#{n}, #{n}, 240"
  when 'red'
    "240, #{n}, #{n}"
  when 'green'
    "#{n}, 240, #{n}"
  end
end

.signed32int_to_hexstr(int) ⇒ Object

from bytes.com/topic/perl/answers/693973-converting-hex-string-32-bit-signed-integer



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# File 'app/helpers/workbench/color_helper.rb', line 24

def self.signed32int_to_hexstr (int) 
  return nil if int > 2147483647 || int < -2147483648
  unsigned = (int < 0 ? 2 ** 32 + int : int)
  return ("%x" % unsigned)
end

Instance Method Details

#contrast_hex(hex_color) ⇒ Object 



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# File 'app/helpers/workbench/color_helper.rb', line 10

def contrast_hex(hex_color)
  c = RGB::Color.from_rgb_hex(hex_color)    
  RGB::Color.from_rgb( *c.to_rgb.collect{|a| 255 - a} ).to_rgb_hex
end

#inverse_hex(hex_color) ⇒ Object 



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# File 'app/helpers/workbench/color_helper.rb', line 5

def inverse_hex(hex_color)
  c = RGB::Color.from_rgb_hex(hex_color)    
  RGB::Color.from_rgb( *c.to_rgb.collect{|a| 255 - a} ).to_rgb_hex
end