Module: Tea::Color

Defined in:
lib/tea/m_color.rb

Overview

The Color module holds utility methods that can mix and split colors.

Constant Summary collapse

CLEAR = 
Color.mix(  0,   0,   0,   0)
BLACK = 
Color.mix(  0,   0,   0)
DARK_RED = 
Color.mix(128,   0,   0)
DARK_GREEN = 
Color.mix(  0, 128,   0)
DARK_YELLOW = 
Color.mix(128, 128,   0)
DARK_BLUE = 
Color.mix(  0,   0, 128)
DARK_MAGENTA = 
Color.mix(128,   0, 128)
DARK_CYAN = 
Color.mix(  0, 128, 128)
DARK_GRAY = 
Color.mix(128, 128, 128)
GRAY = 
Color.mix(192, 192, 192)
RED = 
Color.mix(255,   0,   0)
GREEN = 
Color.mix(  0, 255,   0)
YELLOW = 
Color.mix(255, 255,   0)
BLUE = 
Color.mix(  0,   0, 255)
MAGENTA = 
Color.mix(255,   0, 255)
CYAN = 
Color.mix(  0, 255, 255)
WHITE = 
Color.mix(255, 255, 255)

Class Method Summary collapse

Class Method Details

.mix(red, green, blue, alpha = 255) ⇒ Object

Create a color from red, green, blue and optionally alpha parts. All values passed in should be within 0..255 inclusive.



11
12
13
14
15
16
 
# File 'lib/tea/m_color.rb', line 11

def Color.mix(red, green, blue, alpha=255)
  ((red   & 0xff) << 24) |
  ((green & 0xff) << 16) |
  ((blue  & 0xff) <<  8) |
   (alpha & 0xff)
end

.split(color) ⇒ Object

Break a colour up into its red, green, blue and alpha parts. Returns a 4-element array of the form [red, green, blue, alpha], where each element is within 0..255 inclusive.



21
22
23
24
25
26
 
# File 'lib/tea/m_color.rb', line 21

def Color.split(color)
  [(color & 0xff000000) >> 24,
   (color & 0x00ff0000) >> 16,
   (color & 0x0000ff00) >>  8,
   (color & 0x000000ff)]
end