Making a player.

[Love2dNewbie]

I'm making my very first game with Löve 2D and I'm having a few problems.
How do I change the x position of the player by 1 when he presses the letter d?
I tried:

Code: Select all

function love.update(dt)
  if love.keyboard.isDown("d") then
   player.x = player.x + 1
   end 
end

I'm a newbie to all this programming, so some help would be greatly appriciated.

[Robin]

Hi! You could try:

Code: Select all

function love.keypressed(key)
    if key == 'd' then
         player.x = player.x + 1
    end
end

If that doesn't work for you, please upload a .love of your game so we can help you.

[Love2dNewbie]

Error: main.lua:23: attempt to perform arithmetic on field 'x' (a nil value)

[bekey]

-snip-

[Love2dNewbie]

how can i define it?

[Chroteus]

Post .love file or the code.

[MadByte]

You can create a table for all variables belong to the player.

Code: Select all

-- main.lua

function love.load()
	player = {} -- creates a table
	player.x = 10 -- adds the variable "x" to the table.
	player.y = 10 -- adds the variable "y" to the table.
	player.vel = 100 -- ...
end


function love.update(dt)
	if love.keyboard.isDown("left") then
		player.x = player.x - player.vel * dt
	end
end

EDIT: This is meant for continiously applied velocity to the player coord's.
Robin posted a option for adding a value each time a key is pressed - but not hold down.

[Love2dNewbie]

Still doesnt work.
My code:

Code: Select all

function love.load()
  player = {} 
  player.x = 10 
  player.y = 276
  player.vel = 1
  print('Game Loaded')
  print('v 0.1')
  love.graphics.setBackgroundColor(0, 255, 255) 
  player = love.graphics.newImage("textures/char.png")
end


function love.draw()
   love.graphics.setColor(103, 164, 21, 255)
   love.graphics.rectangle("fill", 0, 300, 800, 300) 
   love.graphics.setColor(240, 255, 255, 255)
   love.graphics.draw(player, 10, 276, 0, 1)
end

function love.update(dt)
   if love.keyboard.isDown("left") then
      player.x = player.x - player.vel * dt
   end
end


function love.keypressed(key, unicode)
end

function love.keyreleased(key, unicode)
  
end

[Chroteus]

Code: Select all

player = love.graphics.newImage("textures/char.png")

Here's your problem. First you define player as a table, and then as an image.

Define image with player.image, not player variable.
And in draw function, draw player.image, instead of player.

So, your game should look like this:

Code: Select all

    function love.load()
      player = {}
      player.x = 10
      player.y = 276
      player.vel = 1
      player.image = love.graphics.newImage("textures/char.png")
      print('Game Loaded')
      print('v 0.1')
      love.graphics.setBackgroundColor(0, 255, 255)
    end


    function love.draw()
       love.graphics.setColor(103, 164, 21, 255)
       love.graphics.rectangle("fill", 0, 300, 800, 300)
       love.graphics.setColor(240, 255, 255, 255)
       love.graphics.draw(player.image, 10, 276, 0, 1)
    end

    function love.update(dt)
       if love.keyboard.isDown("left") then
          player.x = player.x - player.vel * dt
       end
    end


    function love.keypressed(key, unicode)
    end

    function love.keyreleased(key, unicode)
     
    end

[MadByte]

Code: Select all

function love.draw()
   love.graphics.setColor(103, 164, 21, 255)
   love.graphics.rectangle("fill", 0, 300, 800, 300) 
   love.graphics.setColor(240, 255, 255, 255)
   love.graphics.draw(player, 10, 276, 0, 1) -- Input variables here
end

Also you didn't associated the variables of the player to the image in your love.graphics.draw function. It should look like this:

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love.graphics.draw(player.img, player.x, player.y, 0, 1)

also put your player image inside the table for better readability. I usually add a "img" variable into the table.
Good luck