Module: Retouch::Gravity

Defined in:
lib/retouch/gravity.rb,
sig/retouch.rbs

Constant Summary collapse

DIRECTIONS = 
{
  north_west: [0, 0], north: [0.5, 0], north_east: [1, 0],
  west: [0, 0.5], center: [0.5, 0.5], east: [1, 0.5],
  south_west: [0, 1], south: [0.5, 1], south_east: [1, 1]
}.freeze

Class Method Summary collapse

Class Method Details

.offset(container_width, container_height, content_width, content_height, gravity = :center) ⇒ [Integer, Integer]

Parameters:

  • container_width (Integer)
  • container_height (Integer)
  • content_width (Integer)
  • content_height (Integer)
  • gravity (Symbol, String) (defaults to: :center)

Returns:

  • ([Integer, Integer]) 


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# File 'lib/retouch/gravity.rb', line 13

def offset(container_width, container_height, content_width, content_height, gravity = :center)
  horizontal, vertical = DIRECTIONS.fetch(gravity.to_s.tr("-", "_").to_sym) { raise ArgumentError, "unknown gravity: #{gravity}" }
  [(container_width - content_width) * horizontal, (container_height - content_height) * vertical].map(&:round)
end