Damage Formula Extension

#==============================================================================
# ■ Damage Formula Extension
#  FormulaExtend.rb
#------------------------------------------------------------------------------
# 　More functions that can be used for damage formula calculation.
#
# ●How to usea
# 1. Input function for skill damage formula in database. Example(a.plus_atk)
#
# ●Formula functions list
#  1. plus_atk(percent, value)
#   [percent]Calculate by value to original attack power with a chance of.
#  ex:a.plus_atk(50, 100) # 50% chance to add 100 to the attacker's attack power.
#
#  2. plus_def(percent, value)
#   [percent]Calculate by value to original defense with a chance of.
#  ex:b.plus_def(30, -100) # 30% chance to subtract 100 from the target's def.
#
#  3. plus_mat(percent, value)
#   [percent]Calculate by value to original magic attack with a chance of.
#
#  4. plus_mdf(percent, value)
#   [percent]Calculate by value to original magic defense power with a chance of.
#
#  5. plus_agi(percent, value)
#   [percent]Calculate by value to original agility with a chance of.
#
#  6. plus_luk(percent, value)
#   [percent]Calculate by value to original luck with a chance of.
#
# ●Terms of use
#  It can be modified and redistributed without permission from the author.
#  Free for commercial and non-commercial use.
#-----------------------------------------------------------------------------
# Copyright (c) 2017 Triacontane
# This software is released under the MIT License.
# http://opensource.org/licenses/mit-license.php
#-----------------------------------------------------------------------------
# Version
# 1.0.0 2017/01/28 initial release
# ----------------------------------------------------------------------------
# [Blog]   : http://triacontane.blogspot.jp/
# [Twitter]: https://twitter.com/triacontane/
# [GitHub] : https://github.com/triacontane/
#=============================================================================

class Game_Battler < Game_BattlerBase
  #--------------------------------------------------------------------------
  # ● extra parameter
  #--------------------------------------------------------------------------
  def plus_param(original, percent, adjustment)
    return [original + (rand(100) < percent ? adjustment : 0), 0].max
  end
  #--------------------------------------------------------------------------
  # ● add attack
  #--------------------------------------------------------------------------
  def plus_atk(percent, adjustment)
    return plus_param(self.atk, percent, adjustment)
  end
  #--------------------------------------------------------------------------
  # ● add defense
  #--------------------------------------------------------------------------
  def plus_def(percent, adjustment)
    return plus_param(self.def, percent, adjustment)
  end
  #--------------------------------------------------------------------------
  # ● add magic attack
  #--------------------------------------------------------------------------
  def plus_mat(percent, adjustment)
    return plus_param(self.mat, percent, adjustment)
  end
  #--------------------------------------------------------------------------
  # ● add magic defense
  #--------------------------------------------------------------------------
  def plus_mdf(percent, adjustment)
    return plus_param(self.mdf, percent, adjustment)
  end
  #--------------------------------------------------------------------------
  # ● add agility
  #--------------------------------------------------------------------------
  def plus_agi(percent, adjustment)
    return plus_param(self.agi, percent, adjustment)
  end
  #--------------------------------------------------------------------------
  # ● add luck
  #--------------------------------------------------------------------------
  def plus_luk(percent, adjustment)
    return plus_param(self.luk, percent, adjustment)
  end
end