Flappy Bird - DragonRuby Game Toolkit: Apples to Apples

00.md

apples-to-apples.mp4

main.rb

# https://www.reddit.com/r/ruby/comments/1bzxlsl/ive_made_an_article_on_how_to_create_a_flappy/
# https://www.reddit.com/r/ruby/comments/1c44s4s/saw_an_interest_post_about_how_to_create_a_flappy/

class Game
  attr_gtk

  def tick
    Grid.origin_center!
    calc
    render
  end

  def calc
    if state.tick_count == 0
      new_game!
    elsif !state.game_over
      calc_bird
      calc_pipes
    elsif inputs.keyboard.key_down.r
      new_game!
    end
  end

  def calc_bird
    state.bird.dy = 15 if inputs.keyboard.key_down.up
    state.bird.dy -= 1
    state.bird.y += state.bird.dy
    state.bird.angle = state.bird.dy * 2.5

    passed_pipes = state.pipes.find_all { |pipe| pipe.x + pipe.w < Grid.left }
    state.pipes -= passed_pipes
    state.score += passed_pipes.find_all { |pipe| pipe.flip_vertically }.length

    if state.bird.y < Grid.bottom || Geometry.find_intersect_rect(state.bird, state.pipes)
      state.game_over = true
    end
  end

  def calc_pipes
    state.pipes.each { |pipe| pipe.x -= 5 }
    if state.tick_count.zmod? 120
      gap = 100.randomize(:sign)
      state.pipes << { x: Grid.right, y: 0 + gap + 125, w: 64, h: Grid.h, path: "sprites/pipe.png", flip_vertically: true }
      state.pipes << { x: Grid.right, y: -(Grid.h - gap) - 125, w: 64, h: Grid.h, path: "sprites/pipe.png" }
    end
  end

  def render
    outputs.sprites << { **Grid.rect, path: "sprites/bg.png" }
    outputs.sprites << state.bird
    outputs.sprites << state.pipes
    outputs.labels  << { x: 0, y: Grid.top - 64, text: "Score: #{state.score}", size_px: 64, anchor_x: 0.5, anchor_y: 0.5 }
    if state.game_over
      outputs.labels << { x: 0, y: 0, text: "Press R to Restart", size_px: 64, anchor_x: 0.5, anchor_y: 0.5 }
    end
  end

  def new_game!
    state.bird = { x: Grid.left + 100, y: 0, w: 64, h: 64, dy: 0, angle: 0, path: "sprites/bird.png" }
    state.pipes = []
    state.score = 0
    state.game_over = false
  end
end

def tick args
  $game ||= Game.new
  $game.args = args
  $game.tick
end