RPG Tools 
RPG Tools is a compilation of helpful tools when developing a Role Playing Game (RPG). For now the gem has three classes:
Die: Models the use of a simple die (ie. D6, D10, D20, etc.) Throw: Takes an array of Die to be rolled and the offset to be added (ie. 2D6, 3D4+5, 2D10,3D20+2, etc.) CheckRoll: Using a Throw and a threshold models a check roll with one or several chances and some other settings (ie. 2D6 to get greater or equal to 10, 3D10 to get les than 15, etc.)
These tools try to be flexible, general and powerful. Most of Die representation in other gems do the job of a Throw (a pack of Dice with a offset) or just return the result of ten rolls as single Fixum giving no information of each of the single ten rolls (which may be important if you want to have detailed info or want to give feedback to the user). With RPG Tools each object acts as it should: a Die acts as a Die, with no more functionality than a normal Die. Also each roll has all the information needed just if you want it. By default rolling a Throw just returns the total amount, but if you ask for a detailed roll you will get the total amount and the result of each die of the Throw.
Installation
Add to your Gemfile:
gem 'rpg-tools'
bundle update
Using RPG Tools. API
Using Tools::Die
Creating a new Die:
die = Tools::Die.new #Creates a new Die with 20 sides (D20) by default
die = Tools::Die.new 6 #Creates a new Die with 6 sides (D6)
die = Tools::Die.new 100 #Creates a new Die with 100 sides (D100)
Rolling a Die:
die = Tools::Die.new
#Rolling the die once
die.roll # => 8
#Rolling the die five times
die.roll 5 # => [1, 20, 16, 11, 11]
More methods of Die:
#Converting Die into string
die1 = Tools::Die.new 20
die2 = Tools::Die.new 6
die3 = Tools::Die.new 100
die1.to_s # => "D20"
die2.to_s # => "D6"
die3.to_s # => "D100"
#Comparing Dice
die1 = Tools::Die.new 20
die2 = Tools::Die.new 6
die3 = Tools::Die.new 20
die1.eql? die1 # => true
die1.eql? die2 # => false
die1.eql? die3 # => true
Using Tools::Throw
Creating a new Throw:
dice = [Tools::Die.new(6),Tools::Die.new(6),Tools::Die.new(20),Tools::Die.new(100),Tools::Die.new(100),Tools::Die.new(100)]
offset = 3
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6, 1D20, 3D100 and +3
Rolling a Throw:
dice = [Tools::Die.new(6),Tools::Die.new(6),Tools::Die.new(20)]
offset = 2
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6, 1D20 and +2
#Rolling the throw once (simple)
throw.roll # => 10
#Rolling the throw once (detailed)
throw.roll 1,true # => [25, [6, 6, 11]]
#Rolling the throw five times (simple)
throw.roll 5 # => [23, 22, 18, 18, 16]
#Rolling the throw five times (detailed)
throw.roll 5, true # => [[26, [1, 4, 19]], [28, [6, 3, 17]], [13, [1, 4, 6]], [23, [5, 6, 10]], [11, [3, 5, 1]]]
More methods of Throw:
#Converting Throw into string
dice = [Tools::Die.new(6),Tools::Die.new(6),Tools::Die.new(20),Tools::Die.new(100),Tools::Die.new(100),Tools::Die.new(100)]
offset = 3
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6, 1D20, 3D100 and +3
throw.to_s # => "2D6,1D20,3D100+3"
Using Tools::CheckRoll
Creating a new CheckRoll:
dice = [Tools::Die.new(6),Tools::Die.new(6)]
offset = 2
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6+2
threshold = 9
check_roll = Tools::CheckRoll.new throw, threshold #Creates a CheckRoll with 2D6+2 throw and a threshold of 9
Rolling a CheckRoll:
dice = [Tools::Die.new(6),Tools::Die.new(6)]
offset = 2
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6+2
threshold = 9
check_roll = Tools::CheckRoll.new throw, threshold #Creates a CheckRoll with 2D6+2 throw and a threshold of 9
#Roll the CheckRoll
check_roll.roll # => [false, 6]
#CheckRoll results
check_roll.is_successful? # => false
check_roll.result # => [false, 6]
check_roll.detailed_result # => [false, [6, [3, 1]]]
#Reroll the CheckRoll
check_roll.reroll # => [true, 12]
#CheckRoll results
check_roll.is_successful? # => true
check_roll.result # => [true, 12]
check_roll.detailed_result # => [true, [12, [6, 4]]]
Using greater_than_threshold and greater_to_threshold attributes:
dice = [Tools::Die.new(6),Tools::Die.new(6)]
offset = 2
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6+2
threshold = 9
#Creating a "greater and equal to" check
check_roll1 = Tools::CheckRoll.new throw, threshold #1,true,true (by default)
check_roll1.to_s # => "2D6+2 must be greater or equal to 9."
#Creating a "greater than" check
check_roll2 = Tools::CheckRoll.new throw, threshold, 1, true, false
check_roll2.to_s # => "2D6+2 must be greater than 9."
#Creating a "less than" check
check_roll3 = Tools::CheckRoll.new throw, threshold, 1, false, false
check_roll3.to_s # => "2D6+2 must be less than 9."
#Creating a "less and equal to" check
check_roll4 = Tools::CheckRoll.new throw, threshold, 1, false, true
check_roll4.to_s # => "2D6+2 must be less or equal to 9."
More methods of CheckRoll:
#Converting CheckRoll into string
dice = [Tools::Die.new(6),Tools::Die.new(6)]
offset = 2
throw = Tools::Throw.new dice,offset #Creates a new throw with 2D6+2
threshold = 9
check_roll = Tools::CheckRoll.new throw, threshold #Creates a CheckRoll with 2D6+2 throw and a threshold of 9
check_roll.to_s # => "2D6+2 must be greater or equal to 9."
License
Copyright © 2011 Eduardo Casanova Cuesta
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.