Class: RSokoban::RSokobanGame

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

Constant Summary collapse

DIRECTIONS =

Add these to [@player, @player] to move the player in the indicated direction.

{
  left:  [ 0, -1],
  right: [ 0,  1],
  up:    [-1,  0],
  down:  [ 1,  0]
}

Instance Method Summary collapse

Constructor Details

#initialize(window) ⇒ RSokobanGame 



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# File 'lib/rsokoban_game.rb', line 12

def initialize(window)
  @window = window
end

Instance Method Details

#can_move?(direction) ⇒ Boolean 



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# File 'lib/rsokoban_game.rb', line 16

def can_move?(direction)
  # Calculate the player's new position if this move is to be executed. Remember that
  # `new_player` is an Array whereas @player is a Hash.
  new_player = [@player[:row], @player[:col]].zip(DIRECTIONS[direction]).map{|a, b| a + b}
  
  if @walls[new_player] then
    return false
  else
    if @boxes[new_player] then
      # Calculate the position of any box that's in the player's way.
      new_box = new_player.zip(DIRECTIONS[direction]).map{|a, b| a + b}
      if @walls[new_box] or @boxes[new_box] then
        return false
      else
        return true
      end
    else
      return true
    end
  end
end

#draw ⇒ Object 



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# File 'lib/rsokoban_game.rb', line 38

def draw
  @current_level.walls.keys.each do |k|
    @window.move k[0], k[1]
    @window.addstr '#'
  end
  @goals.keys.each do |k|
    @window.move k[0], k[1]
    @window.addstr '.'
  end
  @boxes.keys.each do |k|
    @window.move k[0], k[1]
    if @goals[k] then
      @window.addstr '+'
    else
      @window.addstr '$'
    end
  end
  @window.move @player[:row], @player[:col]
  @window.addstr '@'
  @window.refresh
end

#level_complete? ⇒ Boolean 



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# File 'lib/rsokoban_game.rb', line 60

def level_complete?
  (@boxes.keys - @goals.keys).empty?
end

#move(direction) ⇒ Object 



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# File 'lib/rsokoban_game.rb', line 64

def move(direction)
  return unless can_move?(direction)
  
  new_player = [@player[:row], @player[:col]].zip(DIRECTIONS[direction]).map{|a, b| a + b}
  if @boxes[new_player] then
    new_box = new_player.zip(DIRECTIONS[direction]).map{|a, b| a + b}
    @boxes[new_box]    = true
    @boxes.delete new_player
  end
  
  # Cover up the space behind the player with a space.
  @window.move @player[:row], @player[:col]
  @window.addstr ' '
  
  @player[:row], @player[:col] = new_player
  @states.push({:player => @player.dup, :boxes => @boxes.dup})
end

#play_level(level) ⇒ Object 



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# File 'lib/rsokoban_game.rb', line 82

def play_level(level)
  @current_level = level.dup
  
  @walls  = level.walls.dup
  @boxes  = level.boxes.dup
  @player = level.player.dup
  @goals  = level.goals.dup
  
  @states = [{:player => @player.dup, :boxes => @boxes.dup}]
  
  draw
  
  until level_complete?
    ch = @window.getch
    
    case ch
    when 'q'.ord
      exit
    when 'r'.ord
      @window.clear
      return play_level(level)
    when 'n'.ord
      return
    when 'z'.ord
      undo
    when Ncurses::KEY_DOWN, 's'.ord, 'j'.ord
      move :down
    when Ncurses::KEY_UP, 'w'.ord, 'k'.ord
      move :up
    when Ncurses::KEY_RIGHT, 'd'.ord, 'l'.ord
      move :right
    when Ncurses::KEY_LEFT, 'a'.ord, 'h'.ord
      move :left
    end
    
    draw
  end
  
end

#undo ⇒ Object 



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# File 'lib/rsokoban_game.rb', line 122

def undo
  state   = @states.pop
  @boxes  = state[:boxes]
  @player = state[:player]
  @window.clear
  @states.push(state) if @states.empty?
end