How to make walls

Comments

• Prynok

  October 2013 Posts: 577

  This entire thing seems weird, how are you having trouble with it going off screen if it can only follow your finger?
• newow

  October 2013 Posts: 11

  I just want the circle to remain on screen and not have half of it not showing. I just want it to look more professional
• JakAttak

  October 2013 edited October 2013 Posts: 2,051

  c1.x = math.max(math.min(touch.x, WIDTH - c1.radius), c1.radius)

  c1.y = math.max(math.min(touch.y, HEIGHT - c1.radius), c1.radius)

  That should do it.
• dave1707 Mod

  October 2013 Posts: 10,049

  @newow Try this.

  
  function setup()
      -- this creates the circle
      c1 = physics.body(CIRCLE,70)
      c1.x=400
      c1.y=400
      c1.type=STATIC
  end
  
  function draw()
      background(147, 119, 170, 255)
      --this is what is shown as the circle
      ellipse(c1.x, c1.y, 100, 100)
      
      strokeWidth(10)
      
      -- Do your drawing here
      
  end
  
  function touched(touch)
      --makes sure the circle only moves where you drag it
      if touch.state == MOVING then    
          if touch.x>50 and touch.x<WIDTH-50 then
              c1.x = touch.x
          end
          if touch.y>50 and touch.y<HEIGHT-50 then
              c1.y = touch.y
          end
      end 
  end    
  
  --not finished
  
  
• Prynok

  October 2013 Posts: 577

  I see, well you will have to get rid of the

  c1.x = touch.x
  c1.y = touch.y
  

  Because that would allow it to go through walls, for example, lets say you have a brick wall in the middle of the screen, and the ball is on one side of it. If you tap on the other side of the wall, the ball will magically teleport over there. So you want to "add force" to the physic body, here is a example:

  function touched(t)
  if t.state ~= ENDED then 
      dx = t.x-c1.x
      dy = t.y-c1.y
      if(dx < 0) then
          dx = -speed
          elseif(dx > 0) then
              dx = speed
      end
        if(dy < 0) then
          dy = -speed 
          elseif(dy > 0) then
              dy = speed
              end
   force = vec2(dx, dy) 
  c1.linearVelocity = force
  
  
      end
  
      end
  
  end
  

  Basically, we are testing where the finger is around the ball, and adding a little bit of force to make it slowly move. Now to answer your question, to make the walls you would do something like this:

  floor = physics.body(EDGE,vec2(0,0),vec2(WIDTH,0))
      left = physics.body(EDGE,vec2(0,0),vec2(0,HEIGHT))
      right = physics.body(EDGE, vec2(WIDTH, 0), vec2(WIDTH, HEIGHT))
      top = physics.body(EDGE, vec2(0, HEIGHT),vec2(WIDTH,HEIGHT))
  
• newow

  October 2013 Posts: 11

  Thanks
• newow

  October 2013 Posts: 11

  Hopefully I don't have anymore problems with this