bug des refences value

ref-vs-value-showcase.lua

io.stdout:setvbuf("no")


TANK_SPEED = 240


local offsetX, offsetY

local player = {
  angle = 0
}
player.sprite = {}
player.position = {}
player.velocity = 0
local bullets = {}


function love.load()
  player.sprite = love.graphics.newImage("assets/sprites/tank_sand.png")
  player.position = {
    x = 100, y = 100
  }
end

function love.update(dt)
  local orientation
  local isFiring = false

  if love.keyboard.isDown("down") then
    orientation = "down"
  elseif love.keyboard.isDown("up") then
    orientation = "up"
  end

  if love.keyboard.isDown("right") then
    orientation = "right"
  elseif love.keyboard.isDown("left") then
    orientation = "left"
  end

  if love.keyboard.isDown("space") then
    isFiring = true
  else
    isFiring = false
  end

  -- engine handler
  if orientation == "down" then
    player.velocity = -TANK_SPEED * dt
  elseif orientation == "up" then
    player.velocity = TANK_SPEED * dt
  end

  if orientation == "left" then
    player.angle = player.angle - 90 * dt
  elseif orientation == "right" then
    player.angle = player.angle + 90 * dt
  end

  offsetX = math.cos(math.rad(player.angle)) * player.velocity
  offsetY = math.sin(math.rad(player.angle)) * player.velocity
  player.position.x = player.position.x + offsetX
  player.position.y = player.position.y + offsetY

  if isFiring then
    spawnBullet(player.position, player.angle)
  end

els
  for i = 1, #bullets, 1 do
    local b = bullets[i]
    b.position.x = b.position.x + math.cos(math.rad(b.angle)) * dt * b.speed
    b.position.y = b.position.y + math.sin(math.rad(b.angle)) * dt * b.speed
  end
end

function spawnBullet(position, angle)
  -- angle = 0
  print("spawn bullet")
  local bullet = {
    position = {
      -- et non pas position= position
      -- sinon on passerrai une référence de player.position
      --- et modifier bullet.position.x par exemple modifirai également plauer.position.y
      --- en passant par les propriétés x et y manuellement on passer des copie de ces valeuer 
      --- dite "primitive" => pas de reference mais bien un copie 
      x= position.x,
      y= position.y
    },
    angle = angle,
    speed = 100
  }
  table.insert(bullets, bullet)
end

function love.draw()
  love.graphics.draw(player.sprite, player.position.x, player.position.y, math.rad(player.angle - 90))
  love.graphics.print(player.angle)
  love.graphics.print(#bullets)

  for i = 1, #bullets, 1 do
    love.graphics.circle("fill", bullets[i].position.x, bullets[i].position.y, 10)
  end
end