Module: FieldBetweenHelpers

Included in:
Bchess::Piece
Defined in:
lib/bchess/helpers/field_between_helpers.rb

Instance Method Summary collapse

Instance Method Details

#column_fields(_dcolumn, drow) ⇒ Object 



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# File 'lib/bchess/helpers/field_between_helpers.rb', line 7

def column_fields(_dcolumn, drow)
  smaller, bigger = [row, drow].sort
  (smaller + 1..bigger - 1).map { |r| [column, r] }
end

#diagonal_fields(dcolumn, drow) ⇒ Object 



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# File 'lib/bchess/helpers/field_between_helpers.rb', line 12

def diagonal_fields(dcolumn, drow)
  fields = []
  if dcolumn > column
    if drow > row
      (dcolumn - column - 1).times do |i|
        fields << [dcolumn - (i + 1), drow - (i + 1)]
      end
    else
      (dcolumn - column - 1).times do |i|
        fields << [dcolumn - (i + 1), drow + (i + 1)]
      end
    end
  else
    if drow > row
      (column - dcolumn - 1).times do |i|
        fields << [dcolumn + (i + 1), drow - (i + 1)]
      end
    else
      (column - dcolumn - 1).times do |i|
        fields << [dcolumn + (i + 1), drow + (i + 1)]
      end
    end
  end
  fields
end

#fields_between(dcolumn, drow) ⇒ Object 



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# File 'lib/bchess/helpers/field_between_helpers.rb', line 38

def fields_between(dcolumn, drow)
  return [] unless can_move_to_field?(dcolumn, drow)

  if same_row?(drow)
    row_fields(dcolumn, drow)
  elsif same_column?(dcolumn)
    column_fields(dcolumn, drow)
  elsif same_diagonal?(dcolumn, drow)
    diagonal_fields(dcolumn, drow)
  else
    []
  end
end

#row_fields(dcolumn, _drow) ⇒ Object 



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# File 'lib/bchess/helpers/field_between_helpers.rb', line 2

def row_fields(dcolumn, _drow)
  smaller, bigger = [column, dcolumn].sort
  (smaller + 1..bigger - 1).map { |c| [c, row] }
end