-- Player object
local player = {
   x = 0,
   y = 0,
   speed = 100,
}

-- Camera object
local camera = {
   x = 0,
   y = 0,
   stiffness = 2,
}

-- Sprite object
local sprite = {
   x = 200,
   y = 200,
}

-- Helper function for lerping
local function lerp(v0, v1, t)
   return v0*(1-t)+v1*t
end

-- This gets called every frame
-- dt is the time between last frame and this frame. We can use it for framerate independant code
function love.update(dt)
   -- Basic movement code
   if love.keyboard.isDown("w") then player.y = player.y - player.speed * dt end
   if love.keyboard.isDown("a") then player.x = player.x - player.speed * dt end
   if love.keyboard.isDown("s") then player.y = player.y + player.speed * dt end
   if love.keyboard.isDown("d") then player.x = player.x + player.speed * dt end

   -- Lerp the camera to the player
   camera.x = lerp(camera.x, player.x, camera.stiffness * dt)
   camera.y = lerp(camera.y, player.y, camera.stiffness * dt)
end

-- This gets called every frame
function love.draw()
   -- We can offset our camera to the center of the screen as well
   -- This needs to happen on new variables since we dont want to mess with our REAL camera positions
   -- These new variables is what we will use as our camera position in this frame
   local camx = camera.x - love.graphics.getWidth()/2
   local camy = camera.y - love.graphics.getHeight()/2

   -- Draw the player as a red circle
   -- We offset by the camera position to make it the camera work properly
   love.graphics.setColor(1, 0, 0)
   love.graphics.circle("fill", player.x - camx, player.y - camy, 10)  -- Drawmode, x, y, radius

   -- Draw the sprite as a green rectangle
   love.graphics.setColor(0, 1, 0)
   love.graphics.rectangle("fill", sprite.x - camx, sprite.y - camy, 20, 20) -- Drawmode, x, y, w, h
end