LÖVE

Posted: **Tue Sep 06, 2011 3:45 am**

Hey, I'm very new to Lua and LOVE and this forum

... so I've got this piece of code:

function new_enemies()
	local enemy = {}
	for i = 1,nof_enemies do
		enemy.radius = math.random(10, 35)
		enemy.x = math.random(0 + enemy.radius, 800 - enemy.radius)
		enemy.y = math.random(0 + enemy.radius, 200)
		enemy.segments = math.random(4, 15)
		table.insert(enemies, enemy)
	end
end

math.randomseed(os.time())
enemies = {}
nof_enemies = 3
new_enemies()
print("i,   e.radius,  e.x,    e.y,    e.segments")
for i,e in ipairs(enemies) do
	print(i, e.radius, e.x, e.y, e.segments)
end

(I use that code inside some more code in a LOVE project but I put it alone to run it faster in Lua)

It's supposed to make three random 'enemies' with some properties (x, y, radius, ...) but it keep giving me three groups of the exact same numbers. If you run that on Lua you get something like this:

Code: Select all

C:\Users\Raul\p\lua>rnd.lua
i,   e.radius,  e.x,    e.y,    e.segments
1       27      216     43      8
2       27      216     43      8
3       27      216     43      8

C:\Users\Raul\p\lua>rnd.lua
i,   e.radius,  e.x,    e.y,    e.segments
1       15      643     22      8
2       15      643     22      8
3       15      643     22      8

I need the three groups to be different. I hope you can help me.

Posted: **Tue Sep 06, 2011 3:55 am**

That's because you're using the same table for all three enemies. Tables don't get copied, they're referenced. What you should be doing is this:

Code: Select all

function new_enemies()
	for i = 1,nof_enemies do
		local enemy = {}
		enemy.radius = math.random(10, 35)
		enemy.x = math.random(0 + enemy.radius, 800 - enemy.radius)
		enemy.y = math.random(0 + enemy.radius, 200)
		enemy.segments = math.random(4, 15)
		table.insert(enemies, enemy)
	end
end

Also, I usually call math.random three times after setting the seed. I think some people have reported that on their system it takes a few uses for it to get random, though I believe it's a rare problem.

Posted: **Tue Sep 06, 2011 4:14 am**

Wow, thank you very much. It's working now!

Maybe I'll post the complete code of my game when it's ready. It's something simple (and not very original) about a triangle as a spaceship and some polygons as asteroids enemies.

Posted: **Tue Sep 06, 2011 4:22 am**

No worries. Good luck on your game!

Posted: **Tue Sep 06, 2011 5:20 am**

If anyone got interested on my game, here's the .love

Like I said, is something very simple. Actually it's the second graphic game I ever do.

LÖVE

[solved] math.random problem

[solved] math.random problem

Re: math.random problem

Re: math.random problem

Re: [solved] math.random problem

Re: [solved] math.random problem