How create a new object with different values

[janac]

I'm new to Lua, but not to coding. Most of my coding has been in C++. I really confused about the syntax around creating and instantiating objects. The code below is working, but how do I create a new object with a different table and a different x and y?

pad={
x=63,
y=63,
w=9,
h=1,
clr=143,
pad_pxl={{-4,0},{-3,0},{-2,0},{-1,0},{0,0},{1,0},{2,0},{3,0},{4,0}},
state=0,
stbl={-3,-2,-1,0,1,2,3},
rtm=time(),
rst=true,
ptm=0,
dla=1,
new=function(self,tbl)
tbl=tbl or {}
setmetatable(tbl,{
__index=self
})
return tbl
end,
update=function(self)
--etc.
,
draw=function(self)
--etc.
end
}

 

[simong1993]

Welcome to Lua! The syntax for creating and instantiating objects can feel a bit different coming from C++, but you’re already pretty close with your setup.

In Lua, your pad table acts as a sort of "class" or prototype. The new function you wrote is designed to create a new instance based on this prototype. To create a new pad object with different values for x and y, you just need to pass a table with those values when you call pad:new().

Here's how you can do it:

-- Create a new pad object with different x and y values
local new_pad = pad:new({x=100, y=200})

-- Now new_pad.x is 100, and new_pad.y is 200

This will create a new table (new_pad) that inherits from pad but has x=100 and y=200 specifically set for this instance.

Let me know if you have more questions on Lua – happy to help!