Android Can't find how to put limits on scrolling implementation

[BagarraoEduardo]

Hello all, I'm having a problem with scrolling.
To implement a scrolling system I have followed this tutorial and I find it really cool, but I can't make my scroll to stop on his limits.
Basically I wan't to populate a leaderboard and have a top scrolling limit, and a bottom scrolling limit.
I would like to ask for help to do this to you.

Here's my code:

• Create
  

  drag_offsetY = 0;
  
  flickVelY = 0;
  
  flick_power_calibration = 4;
  flick_power_reduction_each_step = 4;
  
  leaderboard_players = ds_list_create(); //leaderboard sample list
  
  y_origin = 10;
  
  ds_list_add(leaderboard_players, "uracilio");
  ds_list_add(leaderboard_players, "jucemiro");
  ds_list_add(leaderboard_players, "lipindio");
  ds_list_add(leaderboard_players, "semantico");
  ds_list_add(leaderboard_players, "telemovel");
  ds_list_add(leaderboard_players, "uracilio");
  ds_list_add(leaderboard_players, "jucemiro");
  ds_list_add(leaderboard_players, "lipindio");
  ds_list_add(leaderboard_players, "semantico");
  ds_list_add(leaderboard_players, "telemovel");
  ds_list_add(leaderboard_players, "uracilio");
  ds_list_add(leaderboard_players, "jucemiro");
  ds_list_add(leaderboard_players, "lipindio");
  ds_list_add(leaderboard_players, "semantico");
  ds_list_add(leaderboard_players, "telemovel");

• Step
  
  

  if( flickVelY != 0 )
  {
      flick_power = abs(flickVelY);
      flick_direction = sign(flickVelY);
      if( flick_power > flick_power_reduction_each_step ) 
      {
          y += (( flick_power / flick_power_calibration) * flick_direction);
          flickVelY -= flick_power_reduction_each_step * flick_direction;
      }
      else
      {
          flickVelY = 0;
      }
  }

• Global Drag Start
  
  

  drag_offsetY = y - event_data[?"posY"];

• Global Dragging
  
  

  y = event_data[?"posY"] + drag_offsetY;

• Global Drag End
  
  

  flickVelY = event_data[?"diffY"];

• Global Left Down
  
  

  flickVelY = 0;

• Draw
  
  

  draw_self();
  
  var index = 0;
  var i;
  var line_spacing = y_origin;
  var x_offset = 10;
  
  for(i = 0; i < ds_list_size(leaderboard_players); i++)
  {
      draw_text( x - (sprite_width / 2) + x_offset , y - (sprite_height / 2) + line_spacing, string(index) + " - " + ds_list_find_value(leaderboard_players, i));
      line_spacing += 15;
      index++;
  }

I also show the video of game's scrolling current state, so you could understand better
Thanks in advance guys!

Best Regards, Eduardo

 

[FrostyCat]

See: clamp()