Class: CooCoo::Image::Rotate

Inherits:
Transform show all
Defined in:
lib/coo-coo/image.rb

Instance Method Summary collapse

Methods inherited from Transform

#*

Constructor Details

#initialize(ox, oy, radians) ⇒ Rotate

Returns a new instance of Rotate.



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# File 'lib/coo-coo/image.rb', line 201

def initialize(ox, oy, radians)
  super()
  @ox = ox
  @oy = oy
  @radians = radians
end

Instance Method Details

#call(x, y) ⇒ Object 



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# File 'lib/coo-coo/image.rb', line 208

def call(x, y)
  c = ::Math.cos(@radians)
  s = ::Math.sin(@radians)
  
  x = x - @ox
  y = y - @oy

  nx = x * c - y * s
  ny = x * s + y * c
  
  nx = nx + @ox
  ny = ny + @oy
  
  [ nx.floor, ny.floor ]
end