Problem with camera and physics

Getting Started Newbie Questions
#1

I can’t make it so that there is a collision in the walls and the camera stops when the player hits the wall
here are my attempts


this is my movement code

local function update()
    local movedistanceX = player.speed * (joystick.thumbX - joystick.stickX) / joystick.thumblimit
    local movedistanceY = player.speed * (joystick.thumbY - joystick.stickY) / joystick.thumblimit
    local length = math.sqrt(movedistanceX^2 + movedistanceY^2)
    local normalX = length > 0 and (movedistanceX / length) * player.speed or 0
    local normalY = length > 0 and (movedistanceY / length) * player.speed or 0
    --here is the camera code that is in the video
    --for i = 1, map.numChildren do
        --map[i]:setLinearVelocity(-normalX, -normalY)
    --end
    player.hitbox:setLinearVelocity(normalX, normalY)
    player.x = player.hitbox.x
    player.y = player.hitbox.y
    sprite.x = player.x
    sprite.y = player.y
end

Runtime:addEventListener("enterFrame", update)