Making Custom Objects by xLegox

kiddietron · Last edited by kiddietron on Sun May 11, 2008 1:39 am; edited 1 time in total

Ever wonder how you can make object with a set of properties like the Roblox ones? Well here's how...

Your data type here will be a "Vector2"

Vector2 = {} --this declares an object of the class "Vector2" (yes, it is a table as well)

function Vector2:new(one, two) --the function that we will use to create new objects of this class
newTB = {x, y} --this makes our new object with the properties, wich you set as objects in the table
newTB.x = one --set the value to the one called in the argument
newTB.y = two
return newTB
end

--now we can call a new object of the class as such...

a = Vector2.new(7, 9)

print(a.x) --> 7

print(a.y) --> 9

a.x = 10

print(a.x) --> 10
------------------------------------------
Quite simple isnt it?

How can you add member (methods, deemed properly) functions to your object though?

-------------------------------------------

function Vector2:new(one, two)
newTB = {x, y}
newTB.x = one
newTB.y = two

function newTB.reset()
newTB.x = 0
newTB.y = 0
end

return newTB
end

a = Vector2.new(5, 7)

print(a.x) --> 5
print(a.y) --> 7

a:reset()

print(a.x) --> 0
print(a.y) --> 0

---------------------------------------------------------

Qute simple again eh?

I haven' yet figured out how to build these into the hierarchy of objects that roblox uses though, so you can't set an objectvalue's value to one of these objects, or make its parent something.

The main purpose of this is to easily work with data in large scripts.
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jtm110972 · Posted: Sun May 11, 2008 1:35 am Post subject:

Twice, a smiley messed it up...... Shocked

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kiddietron · Posted: Sun May 11, 2008 1:39 am Post subject:

Thanks I fixed it now.
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SirGelatina · Posted: Sun May 11, 2008 3:40 am Post subject:

I used this concept in WitchCraft. The problem of this concept is that #Vector2 return 0, not 2 (Because of x and y properties)

CyberDonkey · Posted: Sun May 11, 2008 10:26 am Post subject:

im not good at scripting
but neither am i bad.
though, i haven't learn "TB"
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chess123mate · Posted: Sun Jul 13, 2008 12:53 am Post subject:

Um... it doesn't work.

It prints out:

7
nil
0
0

Instead of what you said it should:

5
7
0
0

Any explanations?

DingDong272 · Posted: Sun Jul 13, 2008 1:43 pm Post subject:

The arguments get shifted a position. Do this:

print(nil, a.x)
print(nil, a.y)
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chess123mate · Posted: Sun Jul 13, 2008 3:10 pm Post subject:

Then how can this concept be useful at all? You wouldn't know when an argument has been shifted and when it hasn't.

Anaminus · Posted: Sun Jul 13, 2008 7:19 pm Post subject:

This works better:

DingDong272 · Posted: Sun Jul 13, 2008 7:32 pm Post subject:

I don't see any declaration of, "self," in there.

How is it going to work?

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chess123mate · Posted: Sun Jul 13, 2008 9:36 pm Post subject:

"self" must be a special variable in lua. It works Smile

Thanks!

Anaminus · Posted: Mon Jul 14, 2008 2:09 am Post subject:

self automatically refers to the parent of the member function.

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DingDong272 · Posted: Mon Jul 14, 2008 1:59 pm Post subject:

Really? That's pretty cool.
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chess123mate · Posted: Mon Jul 14, 2008 9:44 pm Post subject:

Ah! The main changes necessary were

function name.action()
rather than
function name:action()

And vice-versa for properties; ":" instead of "." for internal functions.
And the use of "self" Smile

Now I can use these things! XD
Thanks again, Anaminus!

DingDong272 · Posted: Tue Jul 15, 2008 2:24 am Post subject:

When deeming a member function, you always want to use a period ( . ), not a colon ( : ), because using a period to call the function might not, "behave," correctly.
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