Module: Tween::Circ::InOut

Defined in:
lib/tween.rb

Class Method Summary collapse

Class Method Details

.ease(t, st, ch, d) ⇒ Object 



102
103
104
105
106
107
108
 
# File 'lib/tween.rb', line 102

def self.ease(t, st, ch, d)
  if (t /= d/2.0) < 1
    return -ch / 2 * (Math.sqrt(1 - t*t) - 1) + st
  else
    return ch / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + st
  end
end