Class: Backtrace

Inherits:
Object
  • Object
show all
Defined in:
lib/algorithm/backtrace.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(maze) ⇒ Backtrace 



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# File 'lib/algorithm/backtrace.rb', line 6

def initialize(maze)
       @maze = maze
end

Instance Attribute Details

#maze ⇒ Object (readonly)

Returns the value of attribute maze.



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# File 'lib/algorithm/backtrace.rb', line 4

def maze
  @maze
end

Instance Method Details

#generate ⇒ Object 



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# File 'lib/algorithm/backtrace.rb', line 10

def generate
  stack = []
  visited_cells = []
  all_cells = []
       @maze.set_raw_value_all 1
       all_cells = @maze.cells

       all_cells.each do |cell|
           @maze.set_value *cell.coords.clone.push(0)
       end

  current_cell = all_cells[rand(all_cells.length)]
  visited_cells.push current_cell

  while visited_cells.size != @maze.total_cells
    neighbours = current_cell.neighbours
    visited_cells.push current_cell
    unvisited_neighbours = (neighbours - visited_cells)
    if !unvisited_neighbours.empty?
      stack.push current_cell
      random_neighbour = unvisited_neighbours.shuffle.shift
               @maze.connect_cells current_cell, random_neighbour
      current_cell = random_neighbour
      visited_cells.push current_cell
    elsif !stack.empty?
      current_cell = stack.pop
    else
      unvisited_index_cells = all_cells - visited_cells
      unvisited_index_cell = unvisited_index_cells.shuffle.shift
      current_cell = unvisited_index_cell
      visited_cells.push current_cell
    end
    visited_cells.uniq!
  end
  @maze
end