How to Spawn multiple objects every 10 seconds - lua

Question

How to make this spawn 'math.random(1,3)' smile.png every 10 seconds , and delete the smile.png after the left screen
<code>
local physics = require ("physics");
physics.start();
local function listener(me)
transition.to (me, {time = math.random(1000,4000), x = math.random(10,310), y = -30, onComplete = function()listener(me)end});
end
--Spawning multiple objects in randoms locations
local function spawnsmile()
local smile = display.newImageRect("smile.png", 45, 45);
smile:setReferencePoint(display.CenterReferencePoint);
smile.x = math.random(-10, 400);
smile.y = -40;
transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600,});
physics.addBody(smile, "dynamic", {density = 0.1, bounce = 0.1, friction = .1, radius = 0});
--Adding touch event
smile:addEventListener("touch", smile);
end
tmr = timer.performWithDelay(0, spawnsmile, total_smiles);
<code>
Regards Kevin

Answer 1

Your code was missing total_smiles value assignment and delay argument.
Working code:
local physics = require ("physics");
physics.start();
local function listener(me)
transition.to (me, {time = math.random(1000,4000), x = math.random(10,310), y = -30, onComplete = function()listener(me)end});
end
--Spawning multiple objects in randoms locations
local function spawnsmile()
local smile = display.newImageRect("Button.png", 45, 45);
smile:setReferencePoint(display.CenterReferencePoint);
smile.x = math.random(-10, 400);
smile.y = -40;
transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600,});
physics.addBody(smile, "dynamic", {density = 0.1, bounce = 0.1, friction = .1, radius = 0});
--Adding touch event
smile:addEventListener("touch", smile);
end
local total_smiles = 15
tmr = timer.performWithDelay(10000, spawnsmile, total_smiles);
Moreover, you should store references to created smiles in order to properly destroy them and don't leak memory. more info on memory managment
local smiles = {}
table.insert(smiles, smile)
And disposal:
for i=#smiles,1,-1 do
smiles[i]:removeSelf()
smiles[i] = nil
end

Answer 2

change your timer to perform every 10.000 ms instead of 0. And your listener function doesnt really fill any purpose, remove that and change your transition.to inside of spawnsmile function to
transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600, onComplete = function(obj) obj:removeSelf() obj = nil end});
That should do what you want it to do =) Also there needs to be a value inside total_smiles, but i guess you have it elsewhere.