Some hints for AI Enemy

[Predricted]

LuA
Hi all
I am working on my game for a while and I need some help with this:
Everytime the player presses circle a new enemy spawns
soo
enemyindex=0
enemy[enemyindex]={x=0,y=0,hp=100,image="e nemywalksright.png"

if pad:circe() and enemyindex <= 10 then
enemyindex=enemyidex+1
end

Now I want to make a for loop i think where i can place all enemy actions and all enemies must act not at the same time, Because else the enemy images will overlay eachother if they are walking to the player so all enemies must have different time when they act..
What I am asking for is a nice for loop with the things that i mentioned..

[slicer4ever]

your idea is correct on what to do, simple expand it to add a variable named action, than in the loop you can do:

for(int i=0;i<maxenemys;i++){
   if(enemy[i].action == 0){
      //don't do anything
   }else if(enemy[i].action==1){
      //attack
   }else if(enemy[i].action==2){
     //look for enemy
   }
}

etc, theirs your basic concept of what to do

[Predricted]

Originally Posted by slicer4ever

your idea is correct on what to do, simple expand it to add a variable named action, than in the loop you can do:

for(int i=0;i<maxenemys;i++){
   if(enemy[i].action == 0){
      //don't do anything
   }else if(enemy[i].action==1){
      //attack
   }else if(enemy[i].action==2){
     //look for enemy
   }
}

etc, theirs your basic concept of what to do

Thanks that helps but 1 thing more at the end of the for loop I must add

if i>=maxenemys then 
i=0 
end

true??
PS. your code is in C i was talking about lua but no big deal haha

[slicer4ever]

i understand, however it's been such a long time that i've used lua i don't fully remember how to do a for loop in it properly, however i kept my code as psuedo as possible, as to your question, no, here's what you do:

while true do
   for i = 0 i < maxenemys; i++ //like i said, don't remeber
   //code to handle enemys
   end
   //code to handle player like normal(doesn't neccissarly have to be below the loop, up to you
end

now the code well be repeated

[Predricted]

Okay I made this code but I get this error that i can't get rid off

enemy={}
enimg="images/enemy/imp_left.png"
enemy[1]={x=25,y=23,hp=100,image="images/enemy/imp_up.png",imageload=Image.load(enimg)}
enemies=1


while true do
screenwaitvblankstart
--movement enemy
if enemies > 1 then
for i=0, enemies do
i=i+1
if enemy[i].x > player1[1].x then
enemy[i].x=enemy[i].x-1
enemy[i].image="images/enemy/imp_left.png"
end
if enemy[i].x < player1[1].x then
enemy[i].x=enemy[i].x+1
enemy[i].image="images/enemy/imp_right.png"
end
if enemy[i].y > player1[1].y then
enemy[i].y=enemy[i].y-1
enemy[i].image="images/enemy/imp_up.png"
end
if enemy[i].y < player1[1].y then
enemy[i].y=enemy[i].y+1 
enemy[i].image="images/enemy/imp_down.png"
end
enemy[i].imageload = Image.load(enemy[i].image)
screen.startDraw()
Image.blit(enemy[i].x,enemy[i].y,enemy[i].imageload)
screen.endDraw()
if i == enemies then
i=0
end
end
end

if pad:circle() and oldpad:circle() ~= pad:circle() then
enemies=enemies+1
enemy[enemies]={x=25,y=23,hp=100,image="images/enemy/imp_up.png",imageload=Image.load(enimg)}
end

error :
script.lua:109:
attempt to index value "?"(a nil value)


it happens when i press circle
-=Double Post Merge =-

enemy={}
enimg="images/enemy/imp_left.png"
enemy[1]={x=25,y=23,hp=100,image=enemy_up.png",imageload=Image.load(enimg)}
enemies=1

while true do
screenwaitvblankstart

enemy movement begins here

--movement enemy

if enemies > 1 then
while true do
for i=0, enemies do
i=i+1
THE LINE BELOW THIS LINE IS THE LINE WHERE THE ERROR TAKES PLACE
if enemy[i].x > player1[1].x then
enemy[i].x=enemy[i].x-1
enemy[i].image="enemy_left.png"
end
if enemy[i].x < player1[1].x then
enemy[i].x=enemy[i].x+1
enemy[i].image="enemy_right.png"
end
if enemy[i].y > player1[1].y then
enemy[i].y=enemy[i].y-1
enemy[i].image="enemy_up.png"
end
if enemy[i].y < player1[1].y then
enemy[i].y=enemy[i].y+1 
enemy[i].image="enemy_down.png"
end
enemy[i].imageload = Image.load(enemy[i].image)
screen.startDraw()
Image.blit(enemy[i].x,enemy[i].y,enemy[i].imageload)
screen.endDraw()
if i >= enemies then
i=0
end
end
end
end

now when you press circle enemies variable increases by 1

if pad:circle() and oldpad:circle() ~= pad:circle() then
enemies=enemies+1
enemy[enemies]={x=25,y=23,hp=100,image="enemy_up.png",imageload=Image.load(enimg)}
end

Okay this error shows up:
attempt to index field '?'(a nil value)

[dan369]

for- loops in Lua start at 1 not 0, that's C. Also a better way to stop re-swaning enemies would be to use a bool.

 
maxNumOfEnemies = 5 
maxEnemiesReached = false

--Note this doesn't need to be in a for-loop
if #enemies >= maxNumOfEnemies then
      maxEnemiesReached = true;
else
      maxEnemiesReached = false;
end

--then just add this
if pad:circle() and oldpad:circle() ~= pad:circle() and not maxEnemiesReached then

Your method of creating new enemies wouldn't work, use table.insert()

[Predricted]

Originally Posted by dan369

for- loops in Lua start at 1 not 0, that's C. Also a better way to stop re-swaning enemies would be to use a bool.

 
maxNumOfEnemies = 5 
maxEnemiesReached = false

--Note this doesn't need to be in a for-loop
if #enemies >= maxNumOfEnemies then
      maxEnemiesReached = true;
else
      maxEnemiesReached = false;
end

--then just add this
if pad:circle() and oldpad:circle() ~= pad:circle() and not maxEnemiesReached then

Your method of creating new enemies wouldn't work, use table.insert()

Your way is easier of making not more then xx amount of enemies
Okay now can you tell me how to use table.insert()
I've tried this

if pad:circle() and oldpad:circle() ~= pad:circle() then
enemies=enemies+1
table.insert(enemy,x)
table.insert(enemy,y)
table.insert(enemy,hp)
table.insert(enemy,image)
table.insert(enemy,imageload)
end

and still no succes the problem is
that x,y,hp,image,imageload needs a variable because when a new enemy is created it will directly follow the enemy so it will use x and y in if statements but they don't have a variable..

[Insert_Witty_Name]

You need to insert a table into the enemy table.

[dan369]

http://lmgtfy.com/?q=table.insert()+lua

[_df_]

Originally Posted by Predricted

if enemies > 1 then
	for i=0, enemies do
		i=i+1
		
		......
		
		if i == enemies then
			i=0
		end
	end
end

your lua code is godawful.

just use iteration over the table then you wont need all those hacks in your code.

local key, enemy
for key,enemy in pairs(enemies) do
	if enemy.y < player.y 
		....
	elseif
	else
	end
end

[Predricted]

Originally Posted by Insert_Witty_Name

You need to insert a table into the enemy table.

Can you tell me how to do that??
I found a few things like this
table.insert(table, [pos,] value)
but i still don't undersatand??

[dan369]

table.insert( table, {x = 0, y = 0, img = etc});

pos - postiton to insert into
table - the table to insert too
value - the values you want to be inserted

[Nielkie]

Originally Posted by _df_

local key, enemy
for key,enemy in pairs(enemies) do
    if enemy.y < player.y 
        ....
    elseif
    else
    end
end

for i,enemy in ipairs(enemies) do
    if enemy.y < player.y 
        ....
    elseif
    else
    end
end

[Predricted]

Originally Posted by dan369

table.insert( table, {x = 0, y = 0, img = etc});

pos - postiton to insert into
table - the table to insert too
value - the values you want to be inserted

LOL the funny thang is that this is all I needed to fix the code
Thanks