LÖVE

RoadhammerGaming wrote: ↑Mon Feb 19, 2018 5:16 am Hi, I am trying to compare the x and y positions of 2 instances to check for a collision, in my project I may have any number of instances of object enemy and object weapon, so I thought I could check for this by using a nested for loop, this is my code:

grump wrote: ↑Mon Feb 19, 2018 9:03 am

RoadhammerGaming wrote: ↑Mon Feb 19, 2018 5:16 am Hi, I am trying to compare the x and y positions of 2 instances to check for a collision, in my project I may have any number of instances of object enemy and object weapon, so I thought I could check for this by using a nested for loop, this is my code:

There is no nested loop in the code you posted, and if I'm not mistaken, this code can't produce the error message.

You're trying to compare a variable that's not been initialized (nothing has been assigned to it) with a number. Since you're adding numbers to all the variables on the left side of your comparison operators (< and >), your code would throw "attempt to perform arithmetic on a nil value", not "attempt to compare nil with a number" if those vars were nil. There is no way this code results in your error.

Please check again and post the relevant code.

for i = #weapon, 1, -1 do
local o = weapon

for j = #enemy, 1, -1 do
local oE = enemy[j]
if (o.x + 20) > oE.xX and (o.x +20) < oE.xX + 41 and (o.y + 22) > oE.yYX and (o.y +22) < oE.yYX + 45 then
points = points + (10 * level)
table.remove(weapon, i)
table.remove(enemy, j)
end
end

if (o.x < -10) or (o.x > love.graphics.getWidth() + 10)
or (o.y < -10) or (o.y > love.graphics.getHeight() + 10) then
table.remove(weapon, i)
end
end