[thetree]

Hey,

How might I go about making bullets?
I've made a bullet class, but I can't figure out how I go about using them, as in, editing them once they're made.

I have:

Bullet = {}
Bullet.new = function(x, y)
	local self = {}
	local x = x or love.mouse.getX()
	local y = y or love.mouse.getY()
		
	self.getX = function() return x end
	self.getY = function() return y end
	self.setX = function(val) x = val end
	self.setY = function(val) Y = val end
	return self
end

Obviously I can do a

if fire then
    bullet = Bullet.new(x, y)
end

But how can I make more than 1 and be able to modify its position?

I tried something like

bullets = {}
for i = 0, 20 do
    bullets[i] = Bullet.new()
end
for i = 0, 20 do
    bullets[i].setX(500)
end

but that didn't seem to work :/

Any help?

Thanks

[BlkDucky]

"love.mouse.love.mouse.getX()"

what are you

what

[ROBO_DONUT]

That's not the idiomatic way to handle classes in Lua. Look up metatables.

[BlkDucky]

surely that doesn't work?

edit: automerge etc.

[ROBO_DONUT]

In fact, your code doesn't even make sense. Try this:

Bullet_mt = {}
Bullet_mt.getX = function(self)
  return self.x
end
Bullet_mt.getY = function(self)
  return self.y
end
Bullet_mt.setX = function(self, x)
  self.x = x
end
Bullet_mt.setY = function(self, y)
  self.y = y
end

function NewBullet(x, y)
  local self = {}
  setmetatable(self, Bullet_mt)

  self.x = x or love.mouse.getX()
  self.y = y or love.mouse.getY()

  return self
end

Then you can use this syntactic sugar to invoke the functions:

local bullet = NewBullet(0, 0)
-- x:y(z) is the same as y(x, z)
bullet:setX(100)
print bullet:getX()

[thetree]

BlkDucky posted:

"love.mouse.love.mouse.getX()"

what are you

what

Sorry, I started writing it out manually, then copy pasted it in forgetting to remove the first love.mouse. Its not like that in the code.

ROBO_DONUT posted:

In fact, your code doesn't even make sense. Try this:

Bullet_mt = {}
Bullet_mt.getX = function(self)
  return self.x
end
Bullet_mt.getY = function(self)
  return self.y
end
Bullet_mt.setX = function(self, x)
  self.x = x
end
Bullet_mt.setY = function(self, y)
  self.y = y
end

function NewBullet(x, y)
  local self = {}
  setmetatable(self, Bullet_mt)

  self.x = x or love.mouse.getX()
  self.y = y or love.mouse.getY()

  return self
end

Then you can use this syntactic sugar to invoke the functions:

local bullet = NewBullet(0, 0)
-- x:y(z) is the same as y(x, z)
bullet:setX(100)
print bullet:getX()

Ok, thanks. But I still don't get how I'd go about using multiple bullets.

[ROBO_DONUT]

thetree posted:

Ok, thanks. But I still don't get how I'd go about using multiple bullets.

You're using them correctly, but it didn't work before because the class itself was broken.

[thetree]

ROBO_DONUT posted:

You're using them correctly, but it didn't work before because the class itself was broken.

Excellent, thank you very much, everything works now :)