Using tween and touch to control an object

So I was experimenting with using the touch and tween functions to control an object on the screen. The idea being that you would use this to control your character in a game. So far it is working fairly well. I put an object in there for you to run into and that worked ok to.

Now, I am a complete beginner and have never even attempted writing any code before I got Codea so I am sure there is a better way to do this.

Then I ran into a problem. I want our "world" to be bigger than the screen size. Like WIDTH and HEIGHT * 2. So I need the camera to follow the character (in this case a ball) around so that you can explore other areas of the world. But as soon as I tried to use translate to do it I lost touch control of the ball. Here is the code, without the translate command so you can see what I am talking about.

Any suggestions on this or am I barking up the wrong try with my control mechanism?

--# BallTouch
BallTouch = class()

function BallTouch:init()
    -- you can accept and set parameters here
    ballT = false
end

function BallTouch:touched(touch)
    -- Codea does not automatically call this method

    if touch.state == BEGAN then
        if touch.x > ball.x - 25 and touch.x < ball.x + 25 and
            touch.y > ball.y - 25 and touch.y < ball.y + 25 then
            ballT  = true        
        end
    else ballT = false    
    end
end

--# Main
-- tween test
displayMode(FULLSCREEN)
-- Use this function to perform your initial setup
function setup()
    bTouch = BallTouch()
    obj = Objects()
    ball = vec2(200,200)
    movPos = false
    mov = false
    bMoving = false
end

-- This function gets called once every frame
function draw()
    background(58, 150, 233, 154)

    fill(255, 0, 0, 255)
    ellipse(ball.x,ball.y,50)   
    obj:draw()     
    if obj:isColliding(ball) then 
    bCol()
    end
end

function bStop()
    tween.stop(bMov)
    reset()
end

function bCol()
    bStop()
    canHit = false
    line = ball - obj.pos
    line = line:normalize()    
    ball = ball + line * 1
end

function reset()
    mov = false
    bMoving = false
end

function actTween(t)
   t = t 
   bMov =   tween(2,ball,{x = t.x,y = t.y},nil,reset) 

end 

function touched(touch)
    bTouch:touched(touch)    
    if ballT == true and mov == false then
        mov = true
    end
    if touch.state == MOVING and mov == true then
        movPos = true
    end
    if movPos == true and touch.state == ENDED then
        actTween(touch)        
        movPos = false  
        bMoving = true      
    end
    if ballT == true and bMoving == true then
        bStop()
    end
end    



--# Objects
Objects = class()

function Objects:init()
    -- you can accept and set parameters here
    self.pos = vec2(500,200)
    self.size = vec2(200,50)
end

function Objects:draw()
    -- Codea does not automatically call this method
    pushStyle()
    fill(254, 255, 0, 255)
    rectMode(CENTER)
    rect(self.pos.x,self.pos.y,self.size.x,self.size.y)
    popStyle()

end

function Objects:isColliding(fae)

    if fae.x > self.pos.x - self.size.x/2 and fae.x < self.pos.x + self.size.x/2 and
    fae.y > self.pos.y - self.size.y/2 and fae.y < self.pos.y + self.size.y/2 then
        return true         
    else 
        return false
    end
end