- A game template for building and distributing Gosu games.
- Quickly generate a game and have it up and running.
- Provide conventions and DSL for building your game.
- Facilitate quickly building distributable artifacts.
- see gamebox on rubygems.org for the list of requirements
Getting started with Gamebox
Why use Gamebox? Gamebox was designed to spring board game development. It allows the developer to define business rules about a game very quickly without having to worry about resource loading, sound/music management, creating windows, or messing with viewports. Gamebox allows you to define a game’s business rules within minutes, using the metaphor of a 5th grade play.
The driving idea behind Gamebox is to provide the ability to have as many of the basic common pieces of a 2D game at the developers disposal from the beginning.
The reason I wrote Gamebox is twofold: first, to aid in 48 hour game writing competitions and second, to allow me to write simple educational games for my kids.
gem install gamebox
git clone git://github.com/shawn42/gamebox.git && cd gamebox && bundle && rake install
To create a new Gamebox project run:
$ gamebox new zapper
This will create the directory structure and needed files to get a basic actor up on the screen:
│ ├── boot.rb
│ ├── environment.rb
│ └── game.yml
│ ├── fonts
│ ├── graphics
│ ├── music
│ └── sounds
│ └── helper.rb
│ └── player.rb
To run your game:
$ cd zapper
A stage is where all the magic happens. Each new play type in your game will use a different stage. An example game may have a number of stages such as:
demo_stage.rb is created for you by using the
gamebox new command.
define_stage :demo do
Actors are the basic building blocks of games in Gamebox. Everything in the game is an actor: the player, an alien, the bullet, even the score on the screen. Internally, actors are just named collections of behaviors and observable attributes.
```ruby define_actor :player do has_behaviors do shooter recharge_time: 4_000, shot_power: 15, kickback: 0.7 shielded bomber kickback: 5
die_by_sword die_by_bullet die_by_bomb blasted_by_bomb jumper end end ```
Behaviors are what bring life to actors. They interact with the actor’s internal data, input, audio, etc.
```ruby define_behavior :projectile do
requires :director requires_behaviors :positioned setup do actor.has_attributes vel_x: 0, vel_y: 0
director.when :update do |delta_ms, delta_secs| actor.x += (actor.vel_x * delta_secs) actor.y += (actor.vel_y * delta_secs) end end end ```
Actor views are the mechanism for drawing an actor in Gamebox. When an actor is created, Gamebox will see if there is a matching actor view by name. It will register the view to be drawn by the renderer. The draw callback is called with the rendering target, the x and y offsets based on the viewport, and the z layer to be used for drawing this actor (see the section on parallax layers for more on z layers).
define_actor_view :label_view do
draw do |target, x_off, y_off, z|
target.print actor.text, actor.x, actor.y, z, actor.font_style
Getting actors on stage
To get an actor on the stage, use the
create_actor method on stage. This can be done directly from a stage or from a behavior that has required stage via
```ruby curtain_up do @player = create_actor :label, x: 20, y: 30, text: “Hello World!” end
stage.create_actor .. ```
Input comes from the InputManager. The stage has direct access via the
input_manager method. Behaviors can request that they get the
requires :input_manager. The preferred way of getting input to your actors is via the actor’s
input method. It returns an InputMapper that can be built with a hash of events. Behaviors then subscribe for those events from the actor’s input, or ask for it during updates.
```ruby actor.input.map_input ‘+space’ => :shoot, ‘+w’ => :jump, ‘+a’ => :walk_left ‘+s’ => :duck ‘+d’ => :walk_right
actor.input.when :shoot do # shoot code end
if actor.input.walk_left? # walk left end ```
Updates all come from the Director. Again, the stage has direct access via
director and behaviors must
director.when :update do |t_ms, t_sec|
# update something
Sound and Music
SoundManager handles the autoloading of sounds from
data/music. The stage has direct access via
sound_manager. To allow an actor to emit sounds or music, give them the
audible behavior. See Reactions below for usage from actors.
```ruby # music sound_manager.play_music :overworld
sound_manager.play_sound :death ```
To ask to react to something we use the
react_to method. It sends your message to all of the actors behaviors, giving them a chance to (you guessed it), react.
actor.react_to :play_sound, :jump
If the actor has an audible behavior listening, he’ll play the jump sound. But what if something else wants to know about playing sounds. Maybe the actor triggers an effect by making sound. If the actor had a
noise_alert behavior, it too would be notified of the
```ruby define_behavior :noise_alert do setup do reacts_with :play_sound end
helpers do def play_sound(*args) # react here end end end ```
reacts_with helper takes a list of events that your behavior is interested in, and maps them to helper methods.
- load paths
- graphics (caching)
- configuring stages
- changing stages
The MIT License (MIT)
Copyright © 2012 Shawn Anderson
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.