DragonRuby Game Toolkit - Simple Dodging Game

main.rb

def tick args
  defaults args
  input_player args
  spawn_bullets args
  calc_bullets args
  render args
end

def defaults args
  args.state.player ||= { x: 100, y: 100 + rand(520), w: 32, h: 32, path: "sprites/square/blue.png", hp: 10 }
  args.state.bullets ||= []
  args.state.explosion_queue ||= []
end

def input_player args
  args.state.player.y += args.inputs.up_down * 5
  if args.state.player.y <= 0
    args.state.player.y = 0
  elsif (args.state.player.y + args.state.player.h) >= 720
    args.state.player.y = 720 - args.state.player.h
  end
end

def spawn_bullets args
  return if !args.state.tick_count.zmod? 10
  args.state.bullets << { x: 1280 + 64, y: 64 + rand(592), w: 64, h: 64, path: "sprites/square/red.png" }
end

def calc_bullets args
  args.state.bullets.each do |b|
    b.x -= 10
    if b.intersect_rect? args.state.player
      args.state.player.hp -= 1
      b.exploded = true
      args.state.explosion_queue << b.merge(exploded_at: args.state.tick_count)
    end
  end

  args.state.bullets.reject! { |b| b.exploded }
  args.state.bullets.reject! { |b| b.x < -64 }
  args.state.explosion_queue.reject! { |e| !e.exploded_at.frame_index(7, 4, false) }

  args.gtk.reset_next_tick if args.state.player.hp <= 0
end

def render args
  args.outputs.labels << {
    x: args.state.player.x + 16,
    y: args.state.player.y + 45,
    text: "#{args.state.player.hp}",
    alignment_enum: 1,
    vertical_alignment_enum: 1
  }
  args.outputs.sprites << args.state.player
  args.outputs.sprites << args.state.bullets
  args.outputs.sprites << args.state.explosion_queue.map do |e|
    frame_index = e.exploded_at.frame_index(7, 4, false)
    e.merge path: "sprites/misc/explosion-#{frame_index}.png"
  end
end