Help with Enemy Class - noob question.

Other
#1

Hello everyone. First of all I want to thanks in advance for the help you are giving me. I searched a lot to try to fix my problem, so I decided that maybe I should post it here.

I have been creating a 2d scroller and the controllers for the main character are working pretty well.

My problem lies on the enemy class.
When I create an enemy, it stays as a child of the back ground (it follows background.x when I call the function monster:move())

But whenever I create a second or third enemy, only the first enemy to be created follows the background, and the others remain static on the screen.

I think the problem is because of the enemyImage, which is the same for all the enemies I create, right?
Is there a way I can create separated image objects for every new monster I create on my main class? 

 

--Monster Class local monster = {} local monster\_mt = { \_\_index = monster } local main = require("main") function monster.new(x, y) monsterImage = display.newImage("images/monster.png") monsterImage.x = x monsterImage.y = y local newMonster = { x = x or 0, y = y or 0 } return setmetatable( newMonster, monster\_mt) end function monster:move() monsterImage.x = self.x + background.x end return monster

Here is a video explaining my problem.

http://www.youtube.com/watch?v=s8mTD6xs_3M&feature=youtu.be

THANK YOU VERY MUCH.

Greetings from Chile.

#2

Do you know middleclass? Great help when you want decent OOP with Lua. I’d have the following class structure: Actor (something that can move around) and subclassed from that the Player and the Enemy.

Anyways, to your errors.

in monster:new you declare monsterImage as a global. And you need monster:new 

-- Monster Class local monster = {} local monster\_mt = { \_\_index = monster } local main = require("main") function monster:new(x, y) local monsterImage = display.newImage("images/monster.png") monsterImage.x = x monsterImage.y = y local newMonster = { x = x or 0, y = y or 0, monsterImage = monsterImage } return setmetatable(newMonster, monster\_mt) end function monster:move() self.monsterImage.x = self.x + background.x end return monster

For the basics on OOP see here: http://onestepback.org/articles/poly/gp-lua.html

#3

Sir, thank you very much.  :D 

You helped me to understand my mistake and how the self. statements work to their respective objects.

I will check out the middleclass, seems very interesting. Thank you for letting me know.

I will put you on the credits of my game if it ever becomes a succes :stuck_out_tongue:

Thank you again, and best regards.

Lucas Peralta Furet.

#4

You need to be very careful about the scope. Better use the local keyword too often than fuck up you stuff. 

http://lua-users.org/wiki/ScopeTutorial

#5

Do you know middleclass? Great help when you want decent OOP with Lua. I’d have the following class structure: Actor (something that can move around) and subclassed from that the Player and the Enemy.

Anyways, to your errors.

in monster:new you declare monsterImage as a global. And you need monster:new 

-- Monster Class local monster = {} local monster\_mt = { \_\_index = monster } local main = require("main") function monster:new(x, y) local monsterImage = display.newImage("images/monster.png") monsterImage.x = x monsterImage.y = y local newMonster = { x = x or 0, y = y or 0, monsterImage = monsterImage } return setmetatable(newMonster, monster\_mt) end function monster:move() self.monsterImage.x = self.x + background.x end return monster

For the basics on OOP see here: http://onestepback.org/articles/poly/gp-lua.html

#6

Sir, thank you very much.  :D 

You helped me to understand my mistake and how the self. statements work to their respective objects.

I will check out the middleclass, seems very interesting. Thank you for letting me know.

I will put you on the credits of my game if it ever becomes a succes :stuck_out_tongue:

Thank you again, and best regards.

Lucas Peralta Furet.

#7

You need to be very careful about the scope. Better use the local keyword too often than fuck up you stuff. 

http://lua-users.org/wiki/ScopeTutorial