module Prawn::TransformationStack

Public Instance Methods

add_to_transformation_stack(a, b, c, d, e, f) click to toggle source
# 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) click to toggle source
# 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() click to toggle source
# File lib/prawn/transformation_stack.rb, line 25
def restore_transformation_stack
  @transformation_stack&.pop
end
save_transformation_stack() click to toggle source
# File lib/prawn/transformation_stack.rb, line 20
def save_transformation_stack
  @transformation_stack ||= [[]]
  @transformation_stack.push(@transformation_stack.last.dup)
end