Class: GamesParadise::GUI::Gtk::NibblesBoard

Inherits:
Gtk::DrawingArea
  • Object
show all
Includes:
Gtk::BaseModule
Defined in:
lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb

Constant Summary collapse

NAMESPACE =
#

NAMESPACE

#
inspect
DOT_SIZE =
#

DOT_SIZE

#
::GamesParadise::Nibbles::DOT_SIZE

Instance Method Summary collapse

Constructor Details

#initialize(run_already = true) ⇒ NibblesBoard

#

initialize

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 44

def initialize(
    run_already = true
  )
  super()
  reset
  override_background_color(:normal, Gdk::RGBA.new(0, 0, 0, 1))
  signal_connect(:draw) { on_draw }
  run if run_already
end

Instance Method Details

#check_apple ⇒ Object

#

check_apple

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 219

def check_apple
  if Gtk::Nibbles.x_coordinate?[0] == @apple_x_coordinate and 
     Gtk::Nibbles.y_coordinate?[0] == @apple_y_coordinate 
    @dots += 1
    randomly_place_the_apple # Set a new apple here.
  end
end

#check_collision ⇒ Object

#

check_collision

This method is the one that will check for collisions, e. g. the snake crashing into the wall.

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 263

def check_collision
  z = @dots
  while z > 0
    if z > 4 and 
       ::GamesParadise::GUI::Gtk::Nibbles.x_coordinate?[0] == ::GamesParadise::GUI::Gtk::Nibbles.x_coordinate?[z] and
       ::GamesParadise::GUI::Gtk::Nibbles.y_coordinate?[0] == ::GamesParadise::GUI::Gtk::Nibbles.y_coordinate?[z]
      @within_the_game_board = false
    end
    z -= 1
  end

  if ::GamesParadise::GUI::Gtk::Nibbles.y_coordinate?[0] > (::GamesParadise::Nibbles::HEIGHT - DOT_SIZE)
    @within_the_game_board = false
  end
  if ::GamesParadise::GUI::Gtk::Nibbles.y_coordinate?[0] < 0
    @within_the_game_board = false
  end
  if ::GamesParadise::GUI::Gtk::Nibbles.x_coordinate?[0] > (::GamesParadise::Nibbles::WIDTH_OF_THE_BOARD - DOT_SIZE)
    @within_the_game_board = false
  end
  if ::GamesParadise::GUI::Gtk::Nibbles.x_coordinate?[0] < 0
    @within_the_game_board = false
  end
end

#draw_objects(cr) ⇒ Object

#

draw_objects

This method will do the actual drawing.

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 182

def draw_objects(cr)

  cr.set_source_rgb(0, 0, 0)
  cr.paint

  cr.set_source(@apple, @apple_x_coordinate, @apple_y_coordinate)
  cr.paint

  for i in 0..@dots
    case i
    when 0
      # =================================================================== #
      # Draw the head part here:
      # =================================================================== #
      cr.set_source(
        @head,
        Gtk::Nibbles.x_coordinate?[i],
        Gtk::Nibbles.y_coordinate?[i]
      )
      cr.paint
    else
      # =================================================================== #
      # Draw the dot part here:
      # =================================================================== #
      cr.set_source(
        @dot,
        Gtk::Nibbles.x_coordinate?[i],
        Gtk::Nibbles.y_coordinate?[i]
      )
      cr.paint
    end
  end
end

#game_over(cr) ⇒ Object

#

game_over

This finishes the game.

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 345

def game_over(cr)
  w = allocation.width  / 2
  h = allocation.height / 2
  cr.set_font_size(15)
  text = cr.text_extents('Game Over')
  cr.set_source_rgb(65535, 65535, 65535)
  cr.move_to(w - text.width/2, h)
  cr.show_text('Game Over')
end

#initialize_the_game_state ⇒ Object

#

initialize_the_game_state

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 101

def initialize_the_game_state
  # ======================================================================= #
  # === @left
  # ======================================================================= #
  @left  = false
  # ======================================================================= #
  # === @right
  # ======================================================================= #
  @right = true
  # ======================================================================= #
  # === @up
  # ======================================================================= #
  @up    = false
  # ======================================================================= #
  # === @down
  # ======================================================================= #
  @down  = false
  # ======================================================================= #
  # === @within_the_game_board
  # ======================================================================= #
  @within_the_game_board = true
  # ======================================================================= #
  # Determine the length of the snake.
  # ======================================================================= #
  @dots = Nibbles::LENGTH_OF_THE_SNAKE
  for i in 0 .. @dots
    toplevel_x_coordinate?[i] = 50 - i * 10
    toplevel_y_coordinate?[i] = 50
  end

  begin
    # ===================================================================== #
    # Next, load up our three images, via Cairo::ImageSurface.
    # ===================================================================== #
    @dot   = Cairo::ImageSurface.from_png(path_to_the_dot_image)
    @head  = Cairo::ImageSurface.from_png(path_to_the_head_image)
    @apple = Cairo::ImageSurface.from_png(path_to_the_apple_image)
  rescue Exception => error
    puts 'cannot load the three images (dot.png, head.png, apple.png)'
    pp error
    exit
  end
  # ======================================================================= #
  # Next, initialize the apple on the game-map.
  # ======================================================================= #
  randomly_place_the_apple
  # ======================================================================= #
  # Add a specific delay to GLib::Timeout.add() next.
  # ======================================================================= #
  GLib::Timeout.add(Nibbles::DELAY) { on_timer }
end

#move ⇒ Object

#

move

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 230

def move
  z = @dots

  loop {
    Gtk::Nibbles.x_coordinate?[z] = Gtk::Nibbles.x_coordinate?[(z - 1)]
    Gtk::Nibbles.y_coordinate?[z] = Gtk::Nibbles.y_coordinate?[(z - 1)]
    z -= 1
    break if z < 1
  }

  dot_size = GamesParadise::Nibbles::DOT_SIZE

  if @left # Move leftwards.
    Gtk::Nibbles.x_coordinate?[0] -= dot_size
  end
  if @right # Move rightwards.
    Gtk::Nibbles.x_coordinate?[0] += dot_size
  end
  if @up # Move upwards.
    Gtk::Nibbles.y_coordinate?[0] -= dot_size
  end
  if @down # Move downwards.
    Gtk::Nibbles.y_coordinate?[0] += dot_size
  end

end

#on_draw ⇒ Object

#

on_draw

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 168

def on_draw 
  cairo_context = window.create_cairo_context
  if @within_the_game_board
    draw_objects(cairo_context)
  else
    game_over(cairo_context)
  end
end

#on_key_down(event) ⇒ Object

#

on_key_down

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 291

def on_key_down(event)
  # Get the key that was passed to this method next:
  key = event.keyval
  if key == Gdk::Keyval::KEY_Left and not @right
    @left = true
    @up = false
    @down = false
  end

  if key == Gdk::Keyval::KEY_Right and not @left
    @right = true
    @up = false
    @down = false
  end

  if key == Gdk::Keyval::KEY_Up and not @down
    @up = true
    @right = false
    @left = false
  end

  if key == Gdk::Keyval::KEY_Down and not @up
    @down = true
    @right = false
    @left = false
  end
end

#on_timer ⇒ Object

#

on_timer

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 82

def on_timer
  if @within_the_game_board
    # ===================================================================== #
    # These are the steps that we need to do. Before the move action
    # we must check whether there is a collision-situation.
    # ===================================================================== #
    check_apple
    check_collision
    move
    queue_draw
    return true
  else
    return false
  end
end

#path_to_the_apple_image ⇒ Object

#

path_to_the_apple_image

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 329

def path_to_the_apple_image
  "#{IMG_DIR}misc/apple.png"
end

#path_to_the_dot_image ⇒ Object

#

path_to_the_dot_image

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 336

def path_to_the_dot_image
  "#{IMG_DIR}misc/dot.png"
end

#path_to_the_head_image ⇒ Object

#

path_to_the_head_image

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 322

def path_to_the_head_image
  "#{IMG_DIR}misc/head.png"
end

#randomly_place_the_apple ⇒ Object

#

randomly_place_the_apple

This will randomly set the starting coordination for the “apple”.

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 158

def randomly_place_the_apple
  r = rand(Nibbles::RAND_POS)
  @apple_x_coordinate = r * ::GamesParadise::Nibbles::DOT_SIZE
  r = rand(Nibbles::RAND_POS)
  @apple_y_coordinate = r * ::GamesParadise::Nibbles::DOT_SIZE
end

#reset ⇒ Object

#

reset

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 57

def reset
  reset_the_internal_variables
  # ======================================================================= #
  # === @configuration
  # ======================================================================= #
  @configuration = [true, __dir__, NAMESPACE]
end

#run ⇒ Object

#

run

#


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 358

def run
  initialize_the_game_state
end

#toplevel_x_coordinate? ⇒ Boolean

#

toplevel_x_coordinate?

#

Returns:

  • (Boolean) 


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 68

def toplevel_x_coordinate?
  Nibbles.x_coordinate?
end

#toplevel_y_coordinate? ⇒ Boolean

#

toplevel_y_coordinate?

#

Returns:

  • (Boolean) 


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# File 'lib/games_paradise/gui/gtk3/nibbles/nibbles_board.rb', line 75

def toplevel_y_coordinate?
  Nibbles.y_coordinate?
end