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Noob here, hopefully this question will be easy for more experienced people. Having trouble with specifically ForeverZeros Hunger HUD addon script, here
I can't figure up how to get the HUD to show up. I found this thread, here - the person said,
 

There should be a part that specifies which switch controls the HUD being displayed. I believe the default is switch 10. To turn on the HUD you simply need to create an event that turns on the switch. I actually use the script in several of my projects, and I accomplish this by simply running an autorun event on the first map I use, and tell it to turn it on, then erase the event.

My problem is, I don't know what to type in to control the defined switch within the event editor. The defined switch is part of a script, it isn't part of the regular switch system. I assume I have to type a command with the script function in the third tab, I'm just unsure of what that is. Below is the script.

#===============================================================================
# ** Hunger_HUD
#===============================================================================

class Hunger_HUD < Window_Base

  #====================================================================#
  #                    BEGIN CONFIGURATION                             #
  #====================================================================#
  
  # Define the colors used for each of the bars.
  HUNGER_EMPTY = Color.new(255, 0, 0) 
  HUNGER_FULL = Color.new(0, 255, 0)
  
  THIRST_EMPTY = Color.new(96, 96, 96)
  THIRST_FULL = Color.new(128, 128, 255)
  
  BACKGROUND_COLOR = Color.new(0, 0, 0)
  
  # Define the type of bar used. (0 = Gradient, 1 = Transitional)
  # It would take longer to explain the differences than to just try each out.
  # There's only two as of the moment.
  BAR_STYLE = 1
  
  # Define the width and height, in pixels, of the bars.
  BAR_WIDTH = 128
  BAR_HEIGHT = 8
  
  # Define switch for active/visibility control within game.
  ONOFF_SWITCH = 10
  
  #====================================================================#
  #                     END CONFIGURATION                              #
  #====================================================================#
  
  def initialize(y = -12)
    super(0, y, 640, 96)
    # Set the windowskin's opacity to 0.
    self.windowskin = nil
    @colors1 = [HUNGER_EMPTY, HUNGER_FULL, BACKGROUND_COLOR]
    @colors2 = [THIRST_EMPTY, THIRST_FULL, BACKGROUND_COLOR]
    @actors = $game_party.actors
    @stats = stats
    refresh
  end
  
  def refresh
    # Dispose the contents of the HUD.
    if self.contents != nil
      self.contents.dispose
      self.contents = nil
    end
    # Adjust width and location of window.
    self.width = @actors.size * (BAR_WIDTH + 48)
    self.x = (640 - self.width) / 2
    self.contents = Bitmap.new(self.width, self.height)
    # Iterate actors.
    @actors.each_index {|i|
      actor = @actors[i]
      # Calculate locations for each actor's bars.
      x = i * (BAR_WIDTH + 48)
      # Draw actor's name.
      self.contents.font.size = 16
      self.contents.draw_text(x, 0, BAR_WIDTH, 16, actor.name)
      # Draw hunger bars.
      w, h, rate, max = BAR_WIDTH, BAR_HEIGHT, @stats[i][0], @stats[i][1]
      self.contents.draw_bar(x, 16, w, h, rate, max, BAR_STYLE, @colors1)
      # Draw thirst bars.
      rate, max, height = @stats[i][2], @stats[i][3], 16+BAR_HEIGHT+4
      self.contents.draw_bar(x, height, w, h, rate, max, BAR_STYLE, @colors2)
    }
  end
  
  def stats
    return @actors.collect {|a| [a.hunger, a.max_hunger, a.thirst, a.max_thirst]}
  end
  
  def update
    self.visible = $game_switches[ONOFF_SWITCH]
    if self.visible
      if (@stats != stats) || (@actors != $game_party.actors)
        @stats, @actors = stats, $game_party.actors
        refresh
      end
    end
  end 
end

#===============================================================================
# ** Gradient_Bar
#===============================================================================

class Bitmap
  
  def draw_bar(x, y, w, h, rate, max, style, colors = nil)
    # Set required instance variables.
    @bar_rect = Rect.new(x, y, w, h)
    @rate, @max, @style, @colors = rate, max, style, colors
    # Define default colors if not defined. (RED <--> GREEN)
    if @colors == nil
      @colors = [Color.new(255, 0, 0), Color.new(0, 255, 0), Color.new(0, 0, 0)]
    end
    # Draw the background color.
    self.fill_rect(@bar_rect, @colors[2])
    # Branch by what style is being used.
    case @style
    when 0 then gradient
    when 1 then transition
    end
  end
#-------------------------------------------------------------------------------
  def gradient
    # Get the bar from the cache. 
    key = [@style, @bar_rect.width-2, @bar_rect.height-2, @colors[0], @colors[1]]
    bar = RPG::Cache.gradient_bar(*key)
    # Draw the gradient bar using rectangular transfer.
    rect = Rect.new(0, 0, fill_width, @bar_rect.height)
    self.blt(@bar_rect.x+1, @bar_rect.y+1, bar, rect)
  end
#-------------------------------------------------------------------------------
  def transition
    # Returns the color for current rate. 
    c1 = [@colors[0].red, @colors[0].green, @colors[0].blue, @colors[0].alpha]
    c2 = [@colors[1].red, @colors[1].green, @colors[1].blue, @colors[1].alpha]
    rgba, rate = [],  1 - (@rate.to_f / @max)
    c1.each_index {|i| rgba[i] = c2[i] - ((c2[i] - c1[i]) * rate) }
    # Set the bars fill rate and color depending on value.
    rect = Rect.new(@bar_rect.x+1, @bar_rect.y+1, fill_width, @bar_rect.height-2)
    self.fill_rect(rect, Color.new(*rgba))
  end
#-------------------------------------------------------------------------------
  def fill_width
    # Calculate the difference, in percentage, of the min and max rates.
    return ((@rate / @max.to_f) * (@bar_rect.width - 2)).round
  end
#-------------------------------------------------------------------------------
end

#===============================================================================
# ** Scene_Map
#===============================================================================

class Scene_Map
  
  alias zer0_hunger_hud_main main
  def main
    # Add the bars to Scene_Map.
    @hunger_hud = Hunger_HUD.new
    zer0_hunger_hud_main
    @hunger_hud.dispose unless @hunger_hud.disposed? || @hunger_hud == nil
  end
  
  alias zer0_hunger_hud_upd update
  def update
    # Update the bars as needed.
    @hunger_hud.update 
    zer0_hunger_hud_upd
  end
end

#===============================================================================
# ** RPG::Cache
#===============================================================================

module RPG::Cache
  
  def self.gradient_bar(style, width, height, color1, color2)
    # Create a unique key to call the bar back with.
    path = [style, width, height, color1, color2]
    # Check if cache already has bitmap defined, if not create it now.
    if !@cache.include?(path) || @cache[path].disposed?
      bitmap, rates = Bitmap.new(width, height), []
      # Iterate through each pixel horizontally, setting a gradient color.
      c1 = [color1.red, color1.green, color1.blue, color1.alpha]
      c2 = [color2.red, color2.green, color2.blue, color2.alpha]
      # Draw the bar, having in transition from the first color to the second.
      c1.each_index {|i| rates[i] = (c1[i] - c2[i]).to_f / width }
      (0...width).each {|i|
        values = [0, 1, 2, 3].collect {|j| c1[j] - (i * rates[j]) }
        # Set the color incrementally. This will be used later.
        bitmap.fill_rect(i, 0, 1, height, Color.new(*values))
      }
      @cache[path] = bitmap
    end
    # Return the created bitmap.
    return @cache[path]
  end
end

class Scene_Map
  attr_accessor :hunger_hud
end

The part I'm struggling with is this below,

 # Define switch for active/visibility control within game.
  ONOFF_SWITCH = 10
  

I understand what I'm supposed to do, (change that switch) so that it is visible within the game. Unsure of how, and I couldn't figure it out through a couple of hours of digging around. I do have both scripts, (Hunger/Thrist + The Hunger HUD addon, both from same thread), and I'm on XP. Just can't figure out how to change that defined switch. Sometimes I can see the HUD flash for a split second if I leave and exit the menu, (it works*, just doesn't stay, (presumingly because of the switch)) but I assume that's just XP jank.

Any help for a newbie would really make my week, been trying to figure this out on my own for a number of days. I've been lurking on the forums for the past couple of days, hope I got this on the right board. Love what y'all do on the website. Making dreams reality ~ Pce.