LÖVE

Posted: **Sat Apr 01, 2017 11:42 am**

Hey, i am trying to make a topdown shooter but there is a bug in my code. Everytime i press space to shoot the bullet travels faster and it resets. I hope someone can help me with this.

Code: Select all

function love.load()
  player = {
    x = love.graphics.getWidth()/2,
    y = love.graphics.getHeight()/2,
    walkspeed = 300,
    walkspeedx = 0,
    walkspeedy = 0,
    keybinds = {
      up = "w",
      down = "s",
      left = "a",
      right = "d",
      shoot = "space"
      },
    dia = 17
    }
  
  bullet = {
    x = 0,
    y = 0,
    dia = 5,
    speed = 20,
    speedx = 0,
    speedy = 0,
  }
  
  bullets = {}
end

function love.update(dt)
  movement(dt)
  shoot(dt)
  
end

function love.draw(dt)
  love.graphics.setColor(0,0,255)
  love.graphics.circle("fill", player.x, player.y, player.dia)
  love.graphics.setColor(255,0,0)
  for i, v in pairs(bullets) do
    love.graphics.circle("fill",v.x,v.y,v.dia)
  end
end

function shoot(dt)
  if love.keyboard.isDown(player.keybinds.shoot) then
    mx,my = love.mouse.getPosition()
    bullet.speedx = (mx - player.x)/ math.sqrt((mx - player.x) * (mx - player.x) + (my - player.y) * (my - player.y))
    bullet.speedy = (my - player.y)/ math.sqrt((mx - player.x) * (mx - player.x) + (my - player.y)  * (my - player.y))
    bullet.x = player.x
    bullet.y = player.y
    table.insert(bullets, bullet)
  end
  
  for i, v in pairs(bullets) do
    v.x = v.x + v.speedx * v.speed * dt
    v.y = v.y + v.speedy * v.speed * dt
    
  end
end

function movement(dt)
  if love.keyboard.isDown(player.keybinds.left) then
    player.walkspeedx = 0 - player.walkspeed
  elseif love.keyboard.isDown(player.keybinds.right) then
    player.walkspeedx = player.walkspeed
  else
    player.walkspeedx = 0
  end
  
  if love.keyboard.isDown(player.keybinds.up) then
    player.walkspeedy = 0 - player.walkspeed
  elseif love.keyboard.isDown(player.keybinds.down) then
    player.walkspeedy = player.walkspeed
  else 
    player.walkspeedy = 0
  end
  
  player.x = player.x + player.walkspeedx * dt
  player.y = player.y + player.walkspeedy * dt
end

Posted: **Sat Apr 01, 2017 2:27 pm**

The problem is that you're using the player.bullet table as a pointer (default in Lua) so when you change values of the player.bullet table, it changes the values of all the inserted tables.
To fix this, create a new table, assign the appropriate values to that, and then insert that into bullets.

EDIT: this should have been posted in Support and Development, not General.

LÖVE

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