Module: Prawn::SVG::Extensions::AdditionalGradientTransforms

Defined in:
lib/prawn/svg/extensions/additional_gradient_transforms.rb

Instance Method Summary collapse

Instance Method Details

#gradient_coordinates(gradient) ⇒ Object 



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# File 'lib/prawn/svg/extensions/additional_gradient_transforms.rb', line 3

def gradient_coordinates(gradient)
  # As of Prawn 2.2.0, apply_transformations is used as purely a boolean.
  #
  # Here we're using it to optionally pass in a 6-tuple transformation matrix that gets applied to the
  # gradient.  This should be added to Prawn properly, and then this monkey patch will not be necessary.

  if gradient.apply_transformations.is_a?(Array)
    x1, y1, x2, y2, transformation = super
    a, b, c, d, e, f = transformation
    na, nb, nc, nd, ne, nf = gradient.apply_transformations

    matrix = Matrix[[a, c, e], [b, d, f], [0, 0, 1]] * Matrix[[na, nc, ne], [nb, nd, nf], [0, 0, 1]]
    new_transformation = matrix.to_a[0..1].transpose.flatten

    [x1, y1, x2, y2, new_transformation]
  else
    super
  end
end