lua love2d, not spawning in bullets

Question

Ive been working on a game, but for some reason the "bullet" im trying to spawn in just wont!?

This is my 'Main'

require "scripts.player"
require "scripts.bullet"

function love.load()
bulletShoot = love.graphics.newImage("pics/bullet.png")
playerPic = love.graphics.newImage("pics/player.png")
background = love.graphics.newImage("pics/background.jpg")
player_load()
bullet.load()
end

function love.update(dt)
player_update(dt)
bullet.update(dt)
end

function love.draw()
love.graphics.draw(background, 0, 0)
bullet.draw()
player_draw()
end

My 'Player' where I try to call it

function player_shoot(dt)
playerShootTimer = playerShootTimer * dt
if(playerShootTimer > playerShootTimerLim) then
    if love.keyboard.isDown("space")then
        bullet.spawn(playerX + (playerWidth / 2) - (bullet.width / 2), playerY)
    end
  end
end

function player_update(dt)
player_move(dt)
player_boundary()
player_shoot(dt)
end

and my 'Bullet' where I try to draw and spawn it

function bullet.spawn(x,y)
table.insert(bullet, {x = x, y = y})
end

function bullet.draw()
for i,v in ipairs(bullet) do
    love.graphics.draw(bulletShoot, v.x, v.y, bullet.width, bullet.height)
end
end

things ive tried - ive changed the bullet to a filled square instead of calling the png - ive copied and pasted the bullet class from an existing(working) game ive made

none of these things have been useful. Any help is useful, thank you!

the provided code only contains a few function definitions.. please provide a minimal executable example. — Piglet
I'm not too keen on Lua internals, but in bullet.spawn you add a table with x and y members set, but in bullet.draw you loop through every member of bullet and attempt to draw using those x and y variables. Correct me if I'm wrong, but wouldn't that loop also include the functions bullet.spawn and bullet.draw? — Thelmund

Spencer Spencer · Accepted Answer · 2017-04-26T05:05:19

The issue appears to be that in player_shoot you are multiplying playerShootTimer by dt instead of adding it.

playerShootTimer = playerShootTimer + dt

I'm assuming playerShootTimer starts at zero. Then you have if it becomes greater than playerShootTimerLim and space is pressed, spawn a bullet. You will also need to reset the playerShootTimer back to zero after spawning a bullet if you want to allow the player to shoot multiple times.

if love.keyboard.isDown("space")then
    bullet.spawn(playerX + (playerWidth / 2) - (bullet.width / 2), playerY)
    playerShootTimer = 0
end

lua love2d, not spawning in bullets

1 Answers