How to make an object move from top to bottom in Lua? - lua

Question

In a game I'm making, there's a square where the game is happening inside. I want the circles that spawn in to start at the top and travel down to the bottom. In the original program, they travel from left to right. How would I go about this? I don't know how to get it to start at the top and travel down instead of starting at the left and traveling to the right.
Here's the original code (I know it's a lot, sorry). I am trying to help a friend.
--Made by Joms or /u/jomy582
--Please credit me if using this in a battle.
spawntimer = 0
timerspawn = 0
storedtime = Time.time
bullets = {}
bulletsbig = {}
bulletswarn = {}
dir = 1
bigheight = {33, 98}
function Update()
spawntimer = spawntimer + (Time.dt*Time.mult)
timerspawn = timerspawn + (Time.dt*Time.mult)
--normal bullets
--change the number in the if statement to make them spawn more frequently/less frequently
--EX: spawntimer > 0.2 spawns them pretty fast
--EX2: spawntimer > 1 spawns them pretty slow
--Make sure to change the subtraction method in the if statement
if spawntimer > 0.16 then
spawntimer = spawntimer-0.16
local bullet = CreateProjectile("bullet", -Arena.width/2, math.random(-Arena.height/2, Arena.height/2))
bullet.SetVar("deadly", true)
table.insert(bullets, bullet)
end
--warning. spawns a warning every 5 seconds
--You could change it, but that may cause some bugs
if timerspawn > 2.2 then
timerspawn = timerspawn-2.2
dir = math.random(1,2)
local bulletwarn = CreateProjectile("warning", 0, Arena.height/2 - bigheight[dir])
bulletwarn.SetVar("warningtimer", 0)
bulletwarn.SetVar("soundtimer", 0)
bulletwarn.SetVar("animtimer", 0)
bulletwarn.SetVar("anim", 1)
table.insert(bulletswarn, bulletwarn)
end
--controlling normal bullets
--a simple method that moves the bullets 1 pixel each frame
--you can change it by editing the bullet.move
--EX: bullet.Move(5*Time.mult, 0) moves the bullets 5 pixels each frame
for i=1, #bullets do
local bullet = bullets[i]
if bullet.isactive then
bullet.Move(2*Time.mult, 0)
if bullet.y > -Arena.height/2 then
bullet.Remove()
end
end
end
--controlling warning timer
--a method that controls the warning timer
for i=1, #bulletswarn do
local bullet = bulletswarn[i]
if bullet.isactive then
local warningtimer = bullet.GetVar("warningtimer") + (Time.mult*Time.dt)
local soundtimer = bullet.GetVar("soundtimer") + (Time.mult*Time.dt)
local animtimer = bullet.GetVar("animtimer") + (Time.mult*Time.dt)
local bulletSprite = bullet.sprite
local anim = bullet.GetVar("anim")
--flashing colors
--change the animtimer > TIME where time is how often you want the warning to blink
--warnings last for 3 seconds. Can change that as well
--to get different colors, find the rgb value of the color you want and insert them below
if animtimer > 0.08 then
animtimer = animtimer-0.08
if anim == 1 then
local r = 0 --put Red value here
local g = 0 --put Green value here
local b = 169 --put Blue value here
bulletSprite.color = {r/255, g/255, b/255} -- changes the color to whatever you'd like. Uses RGB.
bullet.SetVar("anim", 2)
elseif anim == 2 then
local r = 0 --put Red value here
local g = 0 --put Green value here
local b = 255 --put Blue value here
bulletSprite.color = {r/255, g/255, b/255} -- changes the color to whatever you'd like. Uses RGB.
bullet.SetVar("anim", 1)
end
end
--plays a timer evert 10 frames for 3 seconds.
--change the soundname to change the sound
--change the soundtimer > 0.16 to change how often it plays
--can change how long it lasts as well by changing the less than statement
if soundtimer > 0.10 then
soundtimer = soundtimer-0.10
Audio.PlaySound("alarm")
end
--this controls when to spawn the bullets
--change the statement to change how long the warning timer is
if warningtimer > 2 then
warningtimer = warningtimer-2
Audio.PlaySound("shoot")
local bullet1 = CreateProjectile("leftbigbullet", Arena.width/2+30, Arena.height/2 - bigheight[dir]) --where to spawn them
bullet1.SetVar("speed", -4) --how fast
bullet1.SetVar("deadly", true)
local bullet2 = CreateProjectile("rightbigbullet", -Arena.width/2-30, Arena.height/2 - bigheight[dir]) --where to spawn them
bullet2.SetVar("speed", 4) --how fast
bullet2.SetVar("deadly", true)
table.insert(bulletsbig, bullet1)
table.insert(bulletsbig, bullet2)
bullet.Remove()
end
bullet.SetVar("warningtimer", warningtimer)
bullet.SetVar("animtimer", animtimer)
bullet.SetVar("soundtimer", soundtimer)
end
end
--controlling big bullets
--this method controls the big bullets
for i=1, #bulletsbig do
local bullet = bulletsbig[i]
if bullet.isactive then
local speed = bullet.GetVar("speed")
bullet.SendToBottom()
bullet.Move(speed*Time.mult, 0)
if bullet.absx > 700 or bullet.absx < -70 then
bullet.Remove()
end
end
end
end
function OnHit(bullet)
if(bullet.getVar("deadly")) then
Player.Hurt(3)
end
end