1nvader

main.rb

def tick(args)
  args.state.game_state ||= 'playing'
  args.state.player ||= {
    x: 100, y: 40, w: 80, h: 80, angle: 90,
    path: 'sprites/circle/blue.png'
  }
  args.state.player_bullet ||= {
    x: 130, y: 800, w: 20, h: 20,
    path: 'sprites/triangle/equilateral/blue.png'
  }
  args.state.enemy ||= {
    x: 100, y: 600, w: 80, h: 80, angle: -90, next_step: 10,
    path: 'sprites/square/orange.png'
  }
  args.state.enemy_bullet ||= {
    x: 130, y: -999, w: 20, h: 20, angle: 180,
    path: 'sprites/triangle/equilateral/orange.png'
  }
  args.state.veil ||= {
    x: 0, y: 0, w: 1280, h: 720, path: :pixel, r: 255, g: 0, b: 0, a: 0
  }
  args.state.jumbotron ||= {
    x: 640, y: 360, text: '', size_enum: 100, alignment_enum: 1,
    vertical_alignment_enum: 1, r: 255, g: 255, b: 255
  }
  args.state.instructions ||= {
    x: 640, y: 35, text: 'use arrow keys to move. press space to fire',
    alignment_enum: 1, size_enum: 3
  }

  args.outputs.primitives << [
    args.state.player_bullet, args.state.enemy_bullet, args.state.player, args.state.enemy,
    args.state.veil, args.state.jumbotron, args.state.instructions
  ]

  args.state.game_state = 'win' if args.state.player_bullet.intersect_rect? args.state.enemy
  args.state.game_state = 'lose' if args.state.enemy_bullet.intersect_rect? args.state.player

  if args.inputs.keyboard.key_down.escape
    args.gtk.reset
    return
  end

  unless args.state.game_state == 'playing'
    args.state.veil.a = 128
    args.state.jumbotron.text = "You #{args.state.game_state}!"
    args.state.instructions.text = 'press esc to restart'
    return
  end

  args.state.player.x += args.inputs.left_right * 10
  args.state.player.x = args.state.player.x.clamp(0, 1200)
  args.state.enemy.x += args.state.enemy.next_step

  args.state.enemy.next_step *= -1 if args.state.enemy.x < 0 || args.state.enemy.x > 1200 || rand(100).zero?
  args.state.enemy.x = args.state.enemy.x.clamp(0, 1200)

  if args.inputs.keyboard.key_down.space
    args.state.player_bullet.x = args.state.player.x + 30
    args.state.player_bullet.y = args.state.player.y + 40
  end

  if rand(100).zero? && args.state.enemy_bullet.y <= -30
    args.state.enemy_bullet.x = args.state.enemy.x + 30
    args.state.enemy_bullet.y = args.state.enemy.y + 30
  end

  args.state.player_bullet.y += 10 if args.state.player_bullet.y < 800
  args.state.enemy_bullet.y -= 10 if args.state.enemy_bullet.y > -30
end