jcolebot · May 15, 2024 11:42
diff --git a/basic_snake_game.rb b/basic_snake_game.rb
 require 'ruby2d'
 #you can install Ruby 2D on WIN by entering "gem install ruby2d" in the terminal

 set background: 'black'
 set fps_cap: 20
 #grid size is 20 pixels
 SQUARE_SIZE = 20
 #for default window size of 480px * 640px, width is 32 (640/20) and height is 24 (480/20) at grid size = 20 pixels
 GRID_WIDTH = Window.width / SQUARE_SIZE
 GRID_HEIGHT = Window.height / SQUARE_SIZE
 #creating logic for the snake within a class
 class Snake
  attr_writer :direction
 #instance variables begin with @. uninitialized instance variables have the value nil
 #first coordinate is x axis and second is y axis, starting from top left corner
  def initialize
    @positions = [[2, 0], [2, 1], [2, 2], [2 ,3]]
    @direction = 'down'
    @growing = false
  end

  def draw
    @positions.each do |position|
      Square.new(x: position[0] * SQUARE_SIZE, y: position[1] * SQUARE_SIZE, size: SQUARE_SIZE - 1, color: 'olive')
    end
  end

  def grow
    @growing = true
  end
 #.shift moves all elements down by one
  def move
    if !@growing
      @positions.shift
    end

    @positions.push(next_position)
    @growing = false
  end
 #prevents snake from moving backwards into itself
  def can_change_direction_to?(new_direction)
 #case statement is a multibranch statement like switch statements in other languages. 
 #makes it easy to execute different parts of the code based on a set value
    case @direction
    when 'up' then new_direction != 'down'
    when 'down' then new_direction != 'up'
    when 'left' then new_direction != 'right'
    when 'right' then new_direction != 'left'
    end
  end

  def x
    head[0]
  end

  def y
    head[1]
  end

  def next_position
    if @direction == 'down'
      new_coords(head[0], head[1] + 1)
    elsif @direction == 'up'
      new_coords(head[0], head[1] - 1)
    elsif @direction == 'left'
      new_coords(head[0] - 1, head[1])
    elsif @direction == 'right'
      new_coords(head[0] + 1, head[1])
    end
  end
 #checks for snake collision with itself
  def hit_itself?
    @positions.uniq.length != @positions.length
  end

  private
 #this method uses modulus to allow the snake 
 #to pop onto the other side of the screen if it goes over the edge
  def new_coords(x, y)
    [x % GRID_WIDTH, y % GRID_HEIGHT]
  end
 #.last returns last elements of self
  def head
    @positions.last
  end
 end
 #creating basic game mechanics
 class Game
  def initialize
    @ball_x = 10
    @ball_y = 10
    @score = 0
    @finished = false
  end

  def draw
    Square.new(x: @ball_x * SQUARE_SIZE, y: @ball_y * SQUARE_SIZE, size: SQUARE_SIZE, color: 'red')
    Text.new(text_message, color: 'white', x: 10, y: 10, size: 25, z: 1)
  end
 #checks to see if snake touches ball
  def snake_hit_ball?(x, y)
    @ball_x == x && @ball_y == y
  end
 #records when player hits ball
  def record_hit
    @score += 1
    @ball_x = rand(Window.width / SQUARE_SIZE)
    @ball_y = rand(Window.height / SQUARE_SIZE)
  end

  def finish
    @finished = true
  end

  def finished?
    @finished
  end

  private

  def text_message
    if finished?
      "Game over, Your Score was #{@score}. Press 'R' to restart. "
    else
      "Score: #{@score}"
    end
  end
 end

 snake = Snake.new
 game = Game.new

 update do
  clear

  unless game.finished?
    snake.move
  end

  snake.draw
  game.draw

  if game.snake_hit_ball?(snake.x, snake.y)
    game.record_hit
    snake.grow
  end

  if snake.hit_itself?
    game.finish
  end
 end
 #game loop logic
 on :key_down do |event|
  if ['up', 'down', 'left', 'right'].include?(event.key)
    if snake.can_change_direction_to?(event.key)
      snake.direction = event.key
    end
  end

  if game.finished? && event.key == 'r'
    snake = Snake.new
    game = Game.new
  end
 end

 show
	require 'ruby2d'
	#you can install Ruby 2D on WIN by entering "gem install ruby2d" in the terminal

	set background: 'black'
	set fps_cap: 20
	#grid size is 20 pixels
	SQUARE_SIZE = 20
	#for default window size of 480px * 640px, width is 32 (640/20) and height is 24 (480/20) at grid size = 20 pixels
	GRID_WIDTH = Window.width / SQUARE_SIZE
	GRID_HEIGHT = Window.height / SQUARE_SIZE
	#creating logic for the snake within a class
	class Snake
	attr_writer :direction
	#instance variables begin with @. uninitialized instance variables have the value nil
	#first coordinate is x axis and second is y axis, starting from top left corner
	def initialize
	@positions = [[2, 0], [2, 1], [2, 2], [2 ,3]]
	@direction = 'down'
	@growing = false
	end

	def draw
	@positions.each do \|position\|
	Square.new(x: position[0] * SQUARE_SIZE, y: position[1] * SQUARE_SIZE, size: SQUARE_SIZE - 1, color: 'olive')
	end
	end

	def grow
	@growing = true
	end
	#.shift moves all elements down by one
	def move
	if !@growing
	@positions.shift
	end

	@positions.push(next_position)
	@growing = false
	end
	#prevents snake from moving backwards into itself
	def can_change_direction_to?(new_direction)
	#case statement is a multibranch statement like switch statements in other languages.
	#makes it easy to execute different parts of the code based on a set value
	case @direction
	when 'up' then new_direction != 'down'
	when 'down' then new_direction != 'up'
	when 'left' then new_direction != 'right'
	when 'right' then new_direction != 'left'
	end
	end

	def x
	head[0]
	end

	def y
	head[1]
	end

	def next_position
	if @direction == 'down'
	new_coords(head[0], head[1] + 1)
	elsif @direction == 'up'
	new_coords(head[0], head[1] - 1)
	elsif @direction == 'left'
	new_coords(head[0] - 1, head[1])
	elsif @direction == 'right'
	new_coords(head[0] + 1, head[1])
	end
	end
	#checks for snake collision with itself
	def hit_itself?
	@positions.uniq.length != @positions.length
	end

	private
	#this method uses modulus to allow the snake
	#to pop onto the other side of the screen if it goes over the edge
	def new_coords(x, y)
	[x % GRID_WIDTH, y % GRID_HEIGHT]
	end
	#.last returns last elements of self
	def head
	@positions.last
	end
	end
	#creating basic game mechanics
	class Game
	def initialize
	@ball_x = 10
	@ball_y = 10
	@score = 0
	@finished = false
	end

	def draw
	Square.new(x: @ball_x * SQUARE_SIZE, y: @ball_y * SQUARE_SIZE, size: SQUARE_SIZE, color: 'red')
	Text.new(text_message, color: 'white', x: 10, y: 10, size: 25, z: 1)
	end
	#checks to see if snake touches ball
	def snake_hit_ball?(x, y)
	@ball_x == x && @ball_y == y
	end
	#records when player hits ball
	def record_hit
	@score += 1
	@ball_x = rand(Window.width / SQUARE_SIZE)
	@ball_y = rand(Window.height / SQUARE_SIZE)
	end

	def finish
	@finished = true
	end

	def finished?
	@finished
	end

	private

	def text_message
	if finished?
	"Game over, Your Score was #{@score}. Press 'R' to restart. "
	else
	"Score: #{@score}"
	end
	end
	end

	snake = Snake.new
	game = Game.new

	update do
	clear

	unless game.finished?
	snake.move
	end

	snake.draw
	game.draw

	if game.snake_hit_ball?(snake.x, snake.y)
	game.record_hit
	snake.grow
	end

	if snake.hit_itself?
	game.finish
	end
	end
	#game loop logic
	on :key_down do \|event\|
	if ['up', 'down', 'left', 'right'].include?(event.key)
	if snake.can_change_direction_to?(event.key)
	snake.direction = event.key
	end
	end

	if game.finished? && event.key == 'r'
	snake = Snake.new
	game = Game.new
	end
	end

	show
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