LÖVE

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playerX = playerX + playerSpeed * dt

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* dt

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local x = 10
local y = 10
local s = 100

function love.load()
	
end

function love.update(dt)
	if love.keyboard.isDown("w") then
		y = y - s * dt
	end
	if love.keyboard.isDown("s") then
		y = y + s * dt
	end
	if love.keyboard.isDown("a") then
		x = x - s * dt
	end
	if love.keyboard.isDown("d") then
		x = x + s * dt
	end
end

function love.draw()
	love.graphics.rectangle("fill", x, y, 32, 32)
end

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player = {
		xPos = 0, yPos = 0,		--Position of player
		xVel = 0, yVel = 0,		--Velocity of player
		speed = 100,			--Acceleration speed of player
		maxSpeed = 200,			--Max speed of player
		friction = 10,			--Deleceration of player
}

function player.checkKeys(dt)
	if not (love.keyboard.isDown("w") and love.keyboard.isDown("a")) then	--Check if both keys arent pressed at the same time.
		if love.keyboard.isDown("w") then
			player.yVel = player.yVel - (player.speed*dt)	--Up
		elseif love.keyboard.isDown("s") then
			player.yVel = player.yVel + (player.speed*dt)	--Down
		end
	end

	if not (love.keyboard.isDown("a") and love.keyboard.isDown("d")) then	--Check if both keys arent pressed at the same time.
		if love.keyboard.isDown("a") then
			player.yVel = player.yVel - (player.speed*dt)	--Left
		elseif love.keyboard.isDown("d") then
			player.yVel = player.yVel + (player.speed*dt)	--Right
		end
	end
end

function player.applyFriction(dt)
	if player.xVel > 0 then
		player.xVel = math.max(player.xVel-player.friction*dt, 0)	--Round to everything above 0, or 0 itself
	elseif player.xVel < 0 then
		player.xVel = math.min(player.xVel+player.friction*dt, 0)	--Round to everything below 0, or 0 itself
	end

	if player.yVel > 0 then
		player.yVel = math.max(player.yVel-player.friction*dt, 0)	--Round to everything above 0, or 0 itself
	elseif player.yVel < 0 then
		player.yVel = math.min(player.yVel+player.friction*dt, 0)	--Round to everything below 0, or 0 itself
	end
end

function player.limitSpeed(dt)
	if player.xVel > 0 then 
		player.xVel = math.min(player.xVel, player.maxSpeed)	--Round to everything below maxSpeed, or maxSpeed itself
	elseif player.xVel < 0 then
		player.xVel = math.min(player.xVel, player.maxSpeed*-1)	--Round to everything below maxSpeed, or maxSpeed itself
	end

	if player.yVel > 0 then 
		player.yVel = math.min(player.yVel, player.maxSpeed)	--Round to everything below maxSpeed, or maxSpeed itself
	elseif player.yVel < 0 then
		player.yVel = math.min(player.yVel, player.maxSpeed*-1)	--Round to everything below maxSpeed, or maxSpeed itself
	end
end

function player.move(dt)
	player.xPos = player.xPos + player.xVel*dt
	player.yPos = player.yPos + player.yVel*dt
end



function player.update(dt)
	player.checkKeys(dt)	--Check all the keys and apply velocity accordingly
	player.applyFriction(dt)--Apply friction to the player velocity. ||This code uses a fancy trick, ask me if you want it explained||
	player.limitSpeed()		--Limits the player speed. ||This code is also quite tricky, again, ask if you want it explained||
	player.move(dt)			--Apply velocity to the player position
end

function player.draw()
	love.graphics.rectangle("fill", player.xPos, player.yPos, 32, 32)
end

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function player.limitSpeed() -- dt is unnecessary here!
   -- get the current speed
   local s = math.sqrt(player.xVel^2 + player.yVel^2)
   if s > player.maxSpeed then
      -- find the scalar "sv" so that: player.vel = player.vel * sv or player.vel = player.vel * 1/s * maxSpeed
      local sv = maxSpeed/s
      player.xVel = player.xVel * sv
      player.yVel = player.yVel * sv
   end
end

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function player.applyDamping(dt)
  -- where "player.damping" is a positive value (could be greater than 1)
  local d = 1 + player.damping*dt
  player.xVel = player.xVel/d
  player.yVel = player.yVec/d
end