Enemy Detection Script, Enimies will react when they see you Options

[leozer0]

This script is done by Gubid, not me so credit him. I am simply posting it.

This script is something I found when I was making my game and it's a nice little script. It is really easy to use as well.
Basicly it will make an enemy chase you, or run at you when your in their view. You can change the speed of the enemy and how far they can see and more in the script. You can also make them return to there origonal position and continue any "patrols" or watever that you set.

To make the enemy react when they see you just simply name the event 'enemy'

sorry, I haven't got a screen shot yet. If you want a demo i could send you one. Just email me at leozer0@hotmail.com

[Show/Hide] Script

#--------------------------------------------------------------------------
# Enemy Detection System
# by Gubid - 8/12/07
# v 1.2.2 Updated 10/2/07
#--------------------------------------------------------------------------
#Description:
#This system allows events that are named something including "ENEMY" then
#that event will be told to approach Game_Player, until Game_Player has gotten
#a specified distance away. At that time event will return to its original
#position if desired. If you happen to get close enough to the returning event
#it will begin to follow you again.
#
#Thanks to Near Fantasia for supplying the slightly modified path finding script.
#--------------------------------------------------------------------------
#if there are any questions as to the use of this script or
#modifications/additions/etc, please post it to the thread on CreationAyslum.net
#--------------------------------------------------------------------------

#--------------------------------------------------------------------------
#Update_Detect - How to Stop Detection if desired
#--------------------------------------------------------------------------
#1. Within a event, add a SCRIPT (3rd page)
#2. type "update_detect(EVENT_ID, TRUE/FALSE)" -Note: it defaults to false

#--------------------------------------------------------------------------
#RETURN TO POSITION
#--------------------------------------------------------------------------
#Use this to determine if you would like the event to return to its original
#position or not.
#--------------------------------------------------------------------------
RETURN_TO_POSITION = true

#--------------------------------------------------------------------------
#CHASE_SPEED and ENABLE_SPEED_CHANGE
#--------------------------------------------------------------------------
#Use this to set the speed in which enemies will approach after spotting you
#and whether or not their speed will change.
#--------------------------------------------------------------------------
CHASE_SPEED = 5
ENABLE_SPEED_CHANGE = true

#--------------------------------------------------------------------------
#VIEW_RANGE
#--------------------------------------------------------------------------
#Use this to set the distance in which you must be in order to start the detection
#process, or escape to stop.
#--------------------------------------------------------------------------
VIEW_RANGE = 5

#--------------------------------------------------------------------------
#ESCAPE_RANGE
#--------------------------------------------------------------------------
#Use this to set the distance in which you must escape to stop the detection process
#--------------------------------------------------------------------------
ESCAPE_RANGE = 9

#--------------------------------------------------------------------------
#Other Notes
#--------------------------------------------------------------------------
#If the event has a custom move route, they will resume that route when finished
#chasing you, but if you dont set RETURN_TO_POSITION, then they will resume
#their custom route at the location they stopped chasing you.

class Game_Map
#--------------------------------------------------------------------------
# * Frame Update
#--------------------------------------------------------------------------
alias en_detect_gm_update update
def update
en_detect_gm_update

# Update map event
for event in @events.values
if !event.name.include?("enemy")
next
else
if event.character_name != ""
if event.stop_detect?
next
end
if check_distance(event.id) == true
if event.exclamation == false
event.old_type = event.move_type
event.move_type = 2
if ENABLE_SPEED_CHANGE
event.old_speed = event.move_speed
event.move_speed = CHASE_SPEED
end
event.exclamation = true
event.animation_id = 98 #98 happens to be the exclamation animation
event.f_route.clear
end
else
if event.exclamation == true
event.exclamation = false
if RETURN_TO_POSITION == true
if event.x != @map.events[event.id].x or event.y != @map.events[event.id].y
route = get_route(event, @map.events[event.id].x, @map.events[event.id].y)
event.run_route(route)
end
else
event.restore_route
end
end
end
end
end
end
end

def check_distance(id = nil)
unless id == nil
event = $game_map.events[id]
range = ($game_player.x - event.x).abs + ($game_player.y - event.y).abs

if range <= VIEW_RANGE and range > 0
return true
elsif range <= ESCAPE_RANGE and range > 0 and event.exclamation
return true
end
end
end

def get_route(event, x=0, y=0)
target_x = x
target_y = y
max = (target_x - event.x).abs + (target_y - event.y).abs + 5
position = [[event.x, event.y]]
route = [[]]
more_step = [0]
for i in more_step
x = position[i][0]
y = position[i][1]
if !position.include?([x, y + 1]) and event.passable?(x, y, 2)
position.push([x, y + 1])
route.push(route[i] + [2])
if route[i].size + 1 < max
more_step.push(route.index(route[i] + [2]))
end
end

if !position.include?([x - 1, y]) and event.passable?(x, y, 4)
position.push([x - 1, y])
route.push(route[i] + [4])
if route[i].size + 1 < max
more_step.push(route.index(route[i] + [4]))
end
end

if !position.include?([x + 1, y]) and event.passable?(x, y, 6)
position.push([x + 1, y])
route.push(route[i] + [6])
if route[i].size + 1 < max
more_step.push(route.index(route[i] + [6]))
end
end

if !position.include?([x, y - 1]) and event.passable?(x, y, 8)
position.push([x, y - 1])
route.push(route[i] + [8])
if route[i].size + 1 < max
more_step.push(route.index(route[i] + [8]))
end
end
end
if position.index([target_x, target_y]) == false
return [2]
else
return route[position.index([target_x, target_y])]
end
end
end


class Game_Event
attr_accessor :move_type
attr_accessor :move_speed
attr_accessor :old_speed
attr_accessor :exclamation
attr_accessor :old_type
attr_accessor :stop_trigger
attr_reader :f_route

def initialize(map_id, event)
super()
@map_id = map_id
@event = event
@id = @event.id
@erased = false
@starting = false
@through = true
@name = @event.name
@exclamation = false
@f_route = []
@step = 0
@old_type = @move_type
@old_move_route = @move_route
@old_speed = @move_speed
@stop_trigger = false
moveto(@event.x, @event.y)
refresh
end

def stop_detect?
return @stop_trigger
end

def restore_route
@move_type = @old_type
@move_route_index = @original_move_route_index
@move_speed = @old_speed
refresh
return
end

def name
return @name
end

alias en_det_update update
def update
if @f_route.size > 0
run_path unless self.moving?
if @f_route.size == 0
restore_route
end
end
en_det_update
end

def run_route(route)
@f_route = route
@step = 0
end

def run_path
if @f_route.size > 0
if @f_route[@step] == nil
@f_route = []
end
action = @f_route[@step]
@step += 1
case action
when 2
self.move_down
when 4
self.move_left
when 6
self.move_right
when 8
self.move_up
end
end
end
end

class Interpreter
def update_detect(id, set = false)
$game_map.events[id].stop_trigger = set
end

def spotted?
is_true = 0
for event in $game_map.events.values
if event.exclamation
is_true += 1
end
end
if is_true > 0
return true
else
return false
end
end

def change_switch(id = 0, value = false, type = 0, switch = "A")
if id > 0
if type == 0 #for use of main switches
#id is switch_id and value should set to true or false
$game_switches[id] = value
elsif type == 1 #For use of self switches
#id is event.id and switch is the desired selfswitch. It must be text!
#value is true or false
key = [$game_map.map_id, id, switch]
# Updates self switch
$game_self_switches[key] = value
end
# Refresh map
$game_map.need_refresh = true
return true
end
end
end

[TashanDragon]

I haven't looked at the script yet, but i know it is probally going to be great, can you post a demo?

This post has been edited by TashanDragon: Jan 8 2009, 08:21 PM

[Yuu-Mon Musuedo]

Can't believe no one didn't say this yet.

Anyway, thanks a lot, this really helped me a lot with my lag problem, because I was doing this by events. The script works very well, it's meant to make a event follow, leaving the rest up to us. Which just the way I like it.

[obsorber]

Yes this script seems like it should be great. I'm in the early stages of development in my game and have just finished the intro with all the starting cutscenes and waste of time speech. When I get to more parts of the game when I know I'll require this, I'll be using your script. So good job.

So basically all you gotta do is make like a monster event and name it enemy and it will follow you around if you go near it?

[NekoMage]

This script is great! It's just the ticket

I was just wondering whether it would be possible to set different detection/escape areas for different enemies, as well as different chase speeds. I thought of using $event.animation_id = whatever for different things, but as it would change the whole script that would probably affect all the enemies in the vicinity as well, if it worked at all. (I didn't try it XD)

But if anyone knows how this could be worked out, like altering the script so you can set different things in comments or something, that would be really helpful.

[NekoMage]

Very sorry for the double post, but I would really appreciate it if someone could edit (or even just tell me how) the script so that you can use Call Script or Comments to set different values for different events. It would help me out immensely and would undoubtedly make this great script even greater

I'm putting enemies on the map that either wander randomly or follow a custom path, but I want them to move at different speeds and change to different chase speeds. If it's possible, I'd like to be able to change the Chase Frequency for them as well. The path finding and return to position things work fine, as does the detect on/off thing (forgive my lack of the appropriate terminology).

[leozer0]

Very sorry for the double post, but I would really appreciate it if someone could edit (or even just tell me how) the script so that you can use Call Script or Comments to set different values for different events. It would help me out immensely and would undoubtedly make this great script even greater

I'm putting enemies on the map that either wander randomly or follow a custom path, but I want them to move at different speeds and change to different chase speeds. If it's possible, I'd like to be able to change the Chase Frequency for them as well. The path finding and return to position things work fine, as does the detect on/off thing (forgive my lack of the appropriate terminology).

Hey. Sorry that I haven't replied for SOOO long. I forgot about this script until i needed it for my new game.
Anyway . . . I can't help you there, I'm afraid. I didn't make this script, I'm just posting it here cause I thought someone would like to use it. All credit should go to Gubid. If you have questions, you can find and ask him/her. Sorry.

[carnie_natas]

any way to undo all the lag that follows this script???

its not a script for any in depth games,it lags up my game to 10 frames

[Jojozityjo]

so, 2 years and no one can do a frequency change for this as well? it would be marvelous if someone could figure that out

[Tsukihime]

Maybe the ones that needed it knew how to do it but never posted it because no one asked for it.

I've added frequency to function the same as move speed. I'd like to be able to customize the speed and freq for the specific event, but the design doesn't make it very easy to accomplish.

Additional constants: CHASE_FREQ, ENABLE_FREQ_CHANGE
Pretty self-explanatory. Frequencies are from 1 (lowest) to 6 (highest).

Added frequency update for restore_route method
Additional if clause for the update method.

[Show/Hide] Updated with frequency

CODE

#--------------------------------------------------------------------------
#             Enemy Detection System
#             by Gubid - 8/12/07
#             v 1.2.2 Updated 10/2/07
#             v 1.2.3 Updated 11/09/28
#--------------------------------------------------------------------------
#Description:
#This system allows events that are named something including "ENEMY" then
#that event will be told to approach Game_Player, until Game_Player has gotten
#a specified distance away. At that time event will return to its original
#position if desired. If you happen to get close enough to the returning event
#it will begin to follow you again.
#
#Thanks to Near Fantasia for supplying the slightly modified path finding script.
#--------------------------------------------------------------------------
#if there are any questions as to the use of this script or
#modifications/additions/etc, please post it to the thread on CreationAyslum.net
#--------------------------------------------------------------------------

#--------------------------------------------------------------------------
#Update_Detect - How to Stop Detection if desired
#--------------------------------------------------------------------------
#1. Within a event, add a SCRIPT (3rd page)
#2. type "update_detect(EVENT_ID, TRUE/FALSE)" -Note: it defaults to false

#--------------------------------------------------------------------------
#RETURN TO POSITION
#--------------------------------------------------------------------------
#Use this to determine if you would like the event to return to its original
#position or not.
#--------------------------------------------------------------------------
RETURN_TO_POSITION = false

#--------------------------------------------------------------------------
#CHASE_SPEED and ENABLE_SPEED_CHANGE
#--------------------------------------------------------------------------
#Use this to set the speed in which enemies will approach after spotting you
#and whether or not their speed will change.
#-------------------------------------------------------------------------
CHASE_SPEED = 4
ENABLE_SPEED_CHANGE = true

#--------------------------------------------------------------------------
#CHASE_FREQUENCY and ENABLE_FREQUENCY_CHANGE
#-------------------------------------------------------------------------
#Use this to set the frequency in which enemies will approach after spotting
#you and whether or not the frequency will change.
#-------------------------------------------------------------------------
CHASE_FREQ = 6
ENABLE_FREQ_CHANGE = true

#--------------------------------------------------------------------------
#VIEW_RANGE
#--------------------------------------------------------------------------
#Use this to set the distance in which you must be in order to start the detection
#process, or escape to stop.
#--------------------------------------------------------------------------
VIEW_RANGE = 5

#--------------------------------------------------------------------------
#ESCAPE_RANGE
#--------------------------------------------------------------------------
#Use this to set the distance in which you must escape to stop the detection process
#--------------------------------------------------------------------------
ESCAPE_RANGE = 7

#--------------------------------------------------------------------------
#Other Notes
#--------------------------------------------------------------------------
#If the event has a custom move route, they will resume that route when finished
#chasing you, but if you dont set RETURN_TO_POSITION, then they will resume
#their custom route at the location they stopped chasing you.

class Game_Map
#--------------------------------------------------------------------------
# * Frame Update
#--------------------------------------------------------------------------
  alias en_detect_gm_update update
  def update
    en_detect_gm_update
    
    # Update map event
    for event in @events.values
      if !event.name.include?("enemy")
        next
      else
        if event.character_name != ""
          if event.stop_detect?
            next
          end
          if check_distance(event.id) == true
            if event.exclamation == false
              event.old_type = event.move_type
              event.move_type = 2
              if ENABLE_SPEED_CHANGE
                event.old_speed = event.move_speed
                event.move_speed = CHASE_SPEED
              end
                            if ENABLE_FREQ_CHANGE
                                event.old_frequency = event.move_frequency
                                event.move_frequency = CHASE_FREQ
                            end
              event.exclamation = true
              event.animation_id = 98 #98 happens to be the exclamation animation
              event.f_route.clear
            end
          else
            if event.exclamation == true
              event.exclamation = false
              if RETURN_TO_POSITION == true
                if event.x != @map.events[event.id].x or event.y != @map.events[event.id].y
                  route = get_route(event, @map.events[event.id].x, @map.events[event.id].y)
                  event.run_route(route)
                end
              else
                event.restore_route
              end
            end
          end
        end
      end
    end
  end
  
  def check_distance(id = nil)
    unless id == nil
      event = $game_map.events[id]
      range = ($game_player.x - event.x).abs + ($game_player.y - event.y).abs
      
      if range <= VIEW_RANGE and range > 0
        return true
      elsif range <= ESCAPE_RANGE and range > 0 and event.exclamation
        return true
      end
    end
  end

  def get_route(event, x=0, y=0)
    target_x = x
    target_y = y
    max = (target_x - event.x).abs + (target_y - event.y).abs + 5
    position = [[event.x, event.y]]
    route = [[]]
    more_step = [0]
    for i in more_step
      x = position[i][0]
      y = position[i][1]
      if !position.include?([x, y + 1]) and event.passable?(x, y, 2)
        position.push([x, y + 1])
        route.push(route[i] + [2])
        if route[i].size + 1 < max
          more_step.push(route.index(route[i] + [2]))
        end
      end
  
      if !position.include?([x - 1, y]) and event.passable?(x, y, 4)
        position.push([x - 1, y])
        route.push(route[i] + [4])
        if route[i].size + 1 < max
          more_step.push(route.index(route[i] + [4]))
        end
      end

      if !position.include?([x + 1, y]) and event.passable?(x, y, 6)
        position.push([x + 1, y])
        route.push(route[i] + [6])
        if route[i].size + 1 < max
          more_step.push(route.index(route[i] + [6]))
        end
      end

      if !position.include?([x, y - 1]) and event.passable?(x, y, 8)
        position.push([x, y - 1])
        route.push(route[i] + [8])
        if route[i].size + 1 < max
          more_step.push(route.index(route[i] + [8]))
        end
      end
    end
    if position.index([target_x, target_y]) == false
      return [2]
    else
      return route[position.index([target_x, target_y])]
    end
  end
end


class Game_Event
  attr_accessor :move_type
  attr_accessor :move_speed
  attr_accessor :old_speed
  attr_accessor :move_frequency
  attr_accessor :old_frequency
  attr_accessor :exclamation
  attr_accessor :old_type
  attr_accessor :stop_trigger
  attr_reader   :f_route

  def initialize(map_id, event)
    super()
    @map_id = map_id
    @event = event
    @id = @event.id
    @erased = false
    @starting = false
    @through = true
    @name = @event.name
    @exclamation = false
    @f_route = []
    @step = 0
    @old_type = @move_type
    @old_move_route =  @move_route
    @old_speed = @move_speed
    @old_frequency = @move_frequency
    @stop_trigger = false
    moveto(@event.x, @event.y)
    refresh    
  end
  
  def stop_detect?
    return @stop_trigger
  end
    
  def restore_route
    @move_type = @old_type
    @move_route_index = @original_move_route_index
    @move_speed = @old_speed
    @move_frequency = @old_frequency
    refresh
    return
  end
  
  def name
    return @name
  end

  alias en_det_update update
  def update
    if @f_route.size > 0
      run_path unless self.moving?
      if @f_route.size == 0
        restore_route
      end
    end    
    en_det_update
  end
  
  def run_route(route)
    @f_route = route
    @step = 0
  end
  
  def run_path
    if @f_route.size > 0
      if @f_route[@step] == nil
        @f_route = []
      end
      action = @f_route[@step]
      @step += 1
      case action
      when 2
        self.move_down
      when 4
        self.move_left
      when 6
        self.move_right
      when 8
        self.move_up
      end
    end
  end  
end

class Interpreter
  def update_detect(id, set = false)
    $game_map.events[id].stop_trigger = set
  end

  def spotted?
    is_true = 0
    for event in $game_map.events.values
      if event.exclamation
        is_true += 1
      end
    end
    if is_true > 0
      return true
    else
      return false
    end
  end

  def change_switch(id = 0, value = false, type = 0, switch = "A")
    if id > 0
      if type == 0 #for use of main switches
        #id is switch_id and value should set to true or false
        $game_switches[id] = value
      elsif type == 1 #For use of self switches
        #id is event.id and switch is the desired selfswitch. It must be text!
        #value is true or false
        key = [$game_map.map_id, id, switch]
        # Updates self switch
        $game_self_switches[key] = value
      end
      # Refresh map
      $game_map.need_refresh = true
      return true
    end
  end
end

This post has been edited by Tsukihime: Sep 28 2011, 10:09 AM

[Jojozityjo]

oh this is marvellous! even makes fixed standing enemies move after you! i love it thank you so much ^,^

[Tsukihime]

If it were me I'd at least put the freq and speed in the event name so that if such values exist those would be used, otherwise use the defaults specified by the constants.

But I'm not sure how I would parse it lol

[Jojozityjo]

that would make for great convenience, but im just glad for having the frequency changer lol

now i can have enemies that stand still when you arent around or ones that move randomly but only so often.

ive no idea what im doing with scripting so im just happy to find what i can lol ^^

[Tsukihime]

I could probably change it so you could specify move speed and frequency in the event name since there are other scripts that look at the name, but then it would change the requirements of the name. I'd probably want something like ENEMY(3, 6) to indicate that that event will have speed 3 at frequency 6.

This post has been edited by Tsukihime: Sep 30 2011, 09:21 AM