BoundingBox.lua:7: ')' expected near '.'

[no name]

recently I've been attempting to achieve some sort of collision between the player and a box, using BoundingBox.lua. but, i keep getting this error when starting the game:

Error

Syntax error: BoundingBox.lua:7: ')' expected near '.'

here's the code:

function CheckCollision(player.x, player.y, player.w, player.h, box.x, box.y, box.w, box.h)
if player.x > box.x + box.w - 1 or -- Is player. on the right side of box.?
player.y > box.y + box.h - 1 or -- Is player. under box.?
box.x > player.x + player.w - 1 or -- Is box. on the right side of player.?
box.y > player.y + player.h - 1 -- Is b2 under b1?
then
return false -- No collision. Yay!
else
return true -- Yes collision. Ouch!
end
end

as i understand it, i'm supposed to put a ')' somewhere, but i do not understand where it is supposed to be.

thanks in advance

[Positive07]

You have player.x player.y player.w... those are not valid arguments

You either do:

Code: Select all

function CheckCollision(x, y, w, h, bx, by, bw, bh)
local player = {x = x, y = y, w = w, h = h}
local box = {x = bx, y = by, w = bw, h = bh}
-- Your code
end

or:

Code: Select all

function CheckCollision(player, box)
-- Your code
end

[Jasoco]

Here's a working collision check as long as both boxes have valid X, Y, W and H passed.

Code: Select all

function CheckCollision(x1,y1,w1,h1, x2,y2,w2,h2)
	return x1 < x2+w2 and x2 < x1+w1 and y1 < y2+h2 and y2 < y1+h1
end

Returns true if overlapping and false if not all in one line. (Well three)

An alternative version where you pass the two boxes themselves instead:

Code: Select all

function CheckCollision(b1, b2)
	return b1.x < b2.x+b2.w and b2.x < b1.x+b1.w and b1.y < b2.y+b2.h and b2.y < b1.y+b1.h
end

This way it's not specific to the player and box but can be used for any two box objects.