Class: Ra::Pattern::Checkers

Inherits:
Base
  • Object
show all
Defined in:
lib/ra/pattern/checkers.rb

Overview

A checkers pattern that alternates colors using:

colors[⌊u * rows⌋ + ⌊v * cols)⌋ % colors.count]

Constant Summary collapse

DEFAULT_ROWS = 
2
DEFAULT_COLS = 
2
DEFAULT_COLORS = 
[
  Color.black,
  Color.white,
].freeze

Instance Method Summary collapse

Constructor Details

#initialize(cols: DEFAULT_COLS, rows: DEFAULT_ROWS, colors: DEFAULT_COLORS) ⇒ Checkers

Returns a new instance of Checkers.

Parameters:

  • rows (Integer) (defaults to: DEFAULT_ROWS)
  • cols (Integer) (defaults to: DEFAULT_COLS)
  • colors (Array<Ra::Color>) (defaults to: DEFAULT_COLORS) 


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# File 'lib/ra/pattern/checkers.rb', line 19

def initialize(cols: DEFAULT_COLS, rows: DEFAULT_ROWS, colors: DEFAULT_COLORS)
  super()
  @rows = rows
  @cols = cols
  @colors = colors
end

Instance Method Details

#color(point:) ⇒ Ra::Color

Parameters:

  • point (Vector) —

    <u = 0.0..1.0, v = 0.0..1.0>

Returns:



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# File 'lib/ra/pattern/checkers.rb', line 28

def color(point:)
  u = point[0]
  v = point[1]
  index = (u * @rows).floor + (v * @cols).floor

  @colors[index % @colors.count]
end