Module: Prawn::TransformationStack

Included in:
Document
Defined in:
lib/prawn/transformation_stack.rb

Instance Method Summary collapse

Instance Method Details

#add_to_transformation_stack(a, b, c, d, e, f) ⇒ Object 



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# File 'lib/prawn/transformation_stack.rb', line 15

def add_to_transformation_stack(a, b, c, d, e, f)
  @transformation_stack ||= [[]]
  @transformation_stack.last.push([a, b, c, d, e, f].map(&:to_f))
end

#current_transformation_matrix_with_translation(x = 0, y = 0) ⇒ Object 



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# File 'lib/prawn/transformation_stack.rb', line 29

def current_transformation_matrix_with_translation(x = 0, y = 0)
  transformations = (@transformation_stack || [[]]).last

  matrix = Matrix.identity(3)

  transformations.each do |a, b, c, d, e, f|
    matrix *= Matrix[[a, c, e], [b, d, f], [0, 0, 1]]
  end

  matrix *= Matrix[[1, 0, x], [0, 1, y], [0, 0, 1]]

  matrix.to_a[0..1].transpose.flatten
end

#restore_transformation_stack ⇒ Object 



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# File 'lib/prawn/transformation_stack.rb', line 25

def restore_transformation_stack
  @transformation_stack&.pop
end

#save_transformation_stack ⇒ Object 



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# File 'lib/prawn/transformation_stack.rb', line 20

def save_transformation_stack
  @transformation_stack ||= [[]]
  @transformation_stack.push(@transformation_stack.last.dup)
end