LÖVE

Posted: **Thu Nov 24, 2011 2:30 am**

Sorry about another topic again, here's another problem I have.

Here's my love.load function:

function love.load()
	player = {
	sprite = love.graphics.newImage("guy.png"),
	spriteBatch = love.graphics.newSpriteBatch(sprite, 3),
	standing = love.graphics.newQuad(0, 0, 0, 0, 20, 40),
	height = 40,
	width = 20,
	x = gameWidth / 2,
	y = gameHeight - 100,
	y_velocity = 0,
	inAir = false,
	}
	gravity = 400
	jump_height = 300
end

But when I test it, spriteBatch = love.graphics.newSpriteBatch(sprite, 3), returns "incorrect parameter, expected userdata."
What seems to be the problem? I've been trying to figure this out for a while.
Thanks!

Posted: **Thu Nov 24, 2011 3:21 am**

The problem is, the variable sprite is nil since you never make it equal anything. Look more closely at your code. That line that says "sprite" is referring to player.sprite, since it's in the player table.

Indenting your code for table contents makes this sort of thing much easier to spot:

Code: Select all

function love.load()
	player = {
		sprite = love.graphics.newImage("guy.png"),
		spriteBatch = love.graphics.newSpriteBatch(sprite, 3),
		standing = love.graphics.newQuad(0, 0, 0, 0, 20, 40),
		height = 40,
		width = 20,
		x = gameWidth / 2,
		y = gameHeight - 100,
		y_velocity = 0,
		inAir = false,
	}
	gravity = 400
	jump_height = 300
end

Posted: **Thu Nov 24, 2011 3:22 am**

Because "sprite" doesn't exist. And "player.sprite" won't exist until the table is closed. You need to create the SpriteBatch after defining the table by referring to "player.sprite" instead of just sprite.

Posted: **Thu Nov 24, 2011 3:36 am**

Thanks tons! Indenting helped, and now I see where I went wrong.

Posted: **Thu Nov 24, 2011 3:50 am**

You know, I made the same mistake when I started too. It took me a bit to figure it out. Just remember to never try and refer to yourself from within yourself. If you need to refer to yourself, do it after you've been completed.

Where yourself is referring to a table.

Incorrect:

Code: Select all

table = {
  a = 100,
  b = a + 50
}

Correct:

Code: Select all

table = {
  a = 100,
  b
}

table.b = table.a + 50

print(table.b)

> 150

You get what I mean. If you try to refer to yourself before you've been closed off with }, you don't actually exist yet.

LÖVE

Incorrect parameter, expected userdata

Incorrect parameter, expected userdata

Re: Incorrect parameter, expected userdata

Re: Incorrect parameter, expected userdata

Re: Incorrect parameter, expected userdata

Re: Incorrect parameter, expected userdata