Class: C4::Model::Matrix

Inherits:
Object
  • Object
show all
Defined in:
lib/c4/model/matrix.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(matrix, rows, columns) ⇒ Matrix

Returns a new instance of Matrix.



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# File 'lib/c4/model/matrix.rb', line 12

def initialize(matrix, rows, columns)
  @matrix = matrix
  @rows = rows
  @columns = columns
end

Instance Attribute Details

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/c4/model/matrix.rb', line 10

def columns
  @columns
end

#matrix ⇒ Object (readonly)

Returns the value of attribute matrix.



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# File 'lib/c4/model/matrix.rb', line 10

def matrix
  @matrix
end

#rows ⇒ Object (readonly)

Returns the value of attribute rows.



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# File 'lib/c4/model/matrix.rb', line 10

def rows
  @rows
end

Instance Method Details

#diagonal ⇒ Object

rubocop:enable Metrics/AbcSize



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# File 'lib/c4/model/matrix.rb', line 48

def diagonal
  Array.new(size).each_with_index.map do |_, i|
    matrix[i][i]
  end
end

#diagonals ⇒ Object

rubocop:enable Metrics/AbcSize, Performance/TimesMap



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# File 'lib/c4/model/matrix.rb', line 69

def diagonals
  quadrants.flat_map(&:quadrant_diagonals).uniq
end

#partial_square(from, to) ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 34

def partial_square(from, to)
  self.class.new(matrix[from..to].map { |a| a[from..to] }, to - from + 1, to - from + 1)
end

#quadrant_diagonals ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 82

def quadrant_diagonals
  (0...size).map do |i|
    partial_square(0, i).rotate.diagonal
  end
end

#quadrants ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 73

def quadrants
  [
    square,
    square.rotate,
    square.rotate.rotate,
    square.rotate.rotate.rotate
  ]
end

#reverse ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 54

def reverse
  self.class.new(matrix.reverse, rows, columns)
end

#rotate ⇒ Object

rubocop:disable Metrics/AbcSize, Performance/TimesMap



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# File 'lib/c4/model/matrix.rb', line 59

def rotate
  result = rows.times.map do |r|
    columns.times.map do |c|
      matrix[columns - c - 1][r]
    end
  end
  self.class.new(result, columns, rows)
end

#size ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 30

def size
  [rows, columns].max
end

#square ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/c4/model/matrix.rb', line 39

def square
  sq = matrix.map do |col|
    col[0, size].fill_up_to(size, nil)
  end
  sq[0, size].fill_up_to(size, Array.new(size))
  self.class.new(sq, size, size)
end

#transpose ⇒ Object 



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# File 'lib/c4/model/matrix.rb', line 18

def transpose
  self.class.new(
    Array.new(rows).each_with_index.map do |_, row|
      Array.new(columns).each_with_index.map do |_, column|
        matrix[column][row]
      end
    end,
    columns,
    rows
  )
end