class CrImage::Color

• CrImage::Color
• Reference
• Object

Overview

Utility class for parsing and representing colors that can be used for certain methods in CrImage.

See Operation::MaskApply#apply_color, Operation::Draw#draw_square, or Operation::Draw#draw_circle

Defined in:

Constructors

• .default : Color
• .new(red : UInt8, green : UInt8, blue : UInt8, alpha : UInt8 = ChannelType::Alpha.default)
• .of(color : String) : Color

  Parse color from a hex string:

• .random : Color

  Generate a random color with full (255) opacity

Instance Method Summary

• #==(other : Color) : Bool
• #[](channel_type : ChannelType) : UInt8

  Receive the UInt8 portion of this color corresponding to channel_type

• #alpha : UInt8
• #blue : UInt8
• #dist(other : Color, *, manhattan : Bool = false) : Float64
• #gray(red_multiplier : Float = 0.299, green_multiplier : Float = 0.587, blue_multiplier : Float = 0.114) : UInt8

  Convert this Color to a single UInt8 gray value

• #green : UInt8
• #red : UInt8

Constructor Detail

Color.of("#1")        # same as "#11" => Color.new(17, 17, 17, 255)
Color.of("#01")       # => Color.new(1, 1, 1, 255)
Color.of("#123")      # same as "#112233" => Color.new(17, 34, 51, 255)
Color.of("#1234")     # same as "#11223344" => Color.new(34, 51, 68, 17)
Color.of("#010203")   # => Color.new(1, 2, 3, 255)
Color.of("#01020304") # => Color.new(2, 3, 4, 1)

Instance Method Detail