[VXA] Custom EXP Formula

#===============================================================================
#
# Custom EXP Formula
# 19/06/2014
# By Pacman
#
#===============================================================================
#
# This script allows you to give custom EXP formulae to each class. I advise
# that the faint of heart stay away from this script, as creating formulae can
# be complicated and headache-inducing.
#
#===============================================================================
#
#   ~! INSTALLATION !~
# Paste above Main, below Materials.
# To configure the script, write your desired formula for any particular class
# in the array below. To do this, simply write:
#    Custom_Formula[n] = "formula"
# Where n is the ID of the class and "formula" is the formula you wish to have
# calculating the EXP curve.
# In creating your formula, there are 5 variables you can use. These are the
# level, base value, extra value, accelaration A and accelaration B. The level
# refers to the current level of the actor, and the other four values correspond
# to those set in the EXP curve in the database. You must refer to them thusly:
#    Level - lv
#    Base Value - base
#    Extra Value - extra
#    Accelaration A - acc_a
#    Accelaration B - acc_b
# You could also not use any of these fancy variables. Nobody will laugh at you.
# The writing of the formula must be done inside quotation marks ("") and can
# use all basic mathematical proceedings. Exponents must be denoted with **
# instead of ^.
#
#===============================================================================

module Custom_Formula   # Woah woah woah don't touch that man
  Custom_Formula = []   # Don't even think about it
  #--------------------------------------------------------------------------
  Custom_Formula[1] = "(basis**lv - (basis * lv))"
  Custom_Formula[2] = "(basis*((lv-1)**(0.9+acc_a/150))*lv*(lv+1)/
      (6+lv**2/50/acc_b)+(lv-1)*2*extra)"
  #--------------------------------------------------------------------------
end                     # Okay you can just go home now.

#===============================================================================
#
# Just... don't touch this stuff. This is my stuff.
#
#===============================================================================
# ** RPG::Class
#------------------------------------------------------------------------------
#  The data class for class. Yo dawg, I heard you like class.
#==============================================================================

class RPG::Class < RPG::BaseItem
  #--------------------------------------------------------------------------
  # * Get Total EXP Required for Rising to Specified Level
  #--------------------------------------------------------------------------
  def exp_for_level(level)
    lv = level.to_f
    basis = @exp_params[0].to_f
    extra = @exp_params[1].to_f
    acc_a = @exp_params[2].to_f
    acc_b = @exp_params[3].to_f
    return (basis*((lv-1)**(0.9+acc_a/250))*lv*(lv+1)/
      (6+lv**2/50/acc_b)+(lv-1)*extra).round.to_i
  end
  #--------------------------------------------------------------------------
  # * Get Total EXP Required for Rising to Specified Level, but cool this time.
  #--------------------------------------------------------------------------
  def exp_for_level_custom(level, id)
    lv = level.to_f
    basis = @exp_params[0].to_f
    extra = @exp_params[1].to_f
    acc_a = @exp_params[2].to_f
    acc_b = @exp_params[3].to_f
    return eval(Custom_Formula::Custom_Formula[id]).round.to_i rescue 0
  end
end

#==============================================================================
# ** Game_Actor
#------------------------------------------------------------------------------
#  This class handles actors. It is used within the Game_Actors class
# ($game_actors) and is also referenced from the Game_Party class ($game_party).
#==============================================================================

class Game_Actor < Game_Battler
  #--------------------------------------------------------------------------
  #  Alias Method
  #--------------------------------------------------------------------------
  alias pac_custom_formula_expflvl exp_for_level
  #--------------------------------------------------------------------------
  # * Get Total EXP Required for Rising to Specified Level
  #--------------------------------------------------------------------------
  def exp_for_level(level, *args)
    if Custom_Formula::Custom_Formula[@class_id]
      self.class.exp_for_level_custom(level, id, *args)
    else
      self.class.exp_for_level(level, *args)
    end
  end
end

#===============================================================================
#
# END OF SCRIPT
#
#===============================================================================