How to Spawn multiple objects every 10 seconds

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