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POCorona LUA and OOP Design
 

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  1. POCorona LUA and OOP Design
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    <p>So I come from the traditional game development that uses OOP principles and from what I've seen you can mimic this using LUA once you know what you are doing. In some of the code postings I found out how you can use the director class and create files that have a new() function etc. </p> <p>What I'm looking for is a way to manage my weapons. I have a player and an opponent and I would prefer to have one weapon class, say weaponCanon. What I have done is:</p> <pre><code>-- private vars here local power local canonSprite local whatever local someFunction = function() ... end -- Private stuff here local weaponCanon = {} weaponCanon.fire = function(atX, atY) ... end weaponCanon.reset = function() ... end return weaponCanon </code></pre> <p>Then in my level code I simply do:</p> <pre><code>local weaponCanon = require("weaponCanon") weaponCanon.fire(100, 100) </code></pre> <p>This works great and allows me to use a "private" and "public" mentality when coding up my weapons. The problem is that if I want the player and opponent to have a canon:</p> <pre><code>local playerWeapon = require("weaponCanon") local opponentWeapon = require("weaponCanon") </code></pre> <p>This simply returns the same object instead of a new instance to that object. So I only get one weaponCanon at the opponentWeapon location. This is obviously now what I want/need.</p> <p>Our game has many weapons in it and it would be nice to only have one version of each file with a setting telling us if its the opponents weapon or players weapon. The alternative is to copy each file and create a weaponPlayerCanon and a weaponOpponentCanon but I cringe at the thought of modifications to one file and having to change 2+ files every time.</p> <p>How can I make it return an instance and what is the structure of the LUA file to do so?</p> <p>Thanks or any and all help</p> <p>-d</p>
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    1. USDavid Nelson
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    1. COI am well aware of: http://lua-users.org/wiki/LuaModuleFunctionCritiqued and this is where I got my design from but its not really solving my problem unless i overlooked something...
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      1. USDavid Nelson
    2. COI think what you have missed is you need data and logic. So you need a new function to provide the "table" to contain the settings for your weapon which you would then provide as a parameter for the fire function, so it decrements the power value for the gun passed table. Chapter 15 of PIL should set you in the right direction http://www.lua.org/pil/15.html
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      1. USJane T
    3. COWhat you've done here tells me something I was planning to test out eventually anyway, so thanks for saving me the trouble.
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