Javascript active area mechanism draft

active_area_mechanism

/*
Javascript Active area.
-----------------------

So this is pretty much what it does, you define areas and this code
allows you to verify if your data source is retreiving points
in any of the defined areas.

*/

window.areas = new Array();
window.conditions = new Array();
window.callbacks = new Array();

function initialize(areas, conditions, callbacks)
{
  window.areas = areas;
  window.conditions = conditions;
  window.callbacks = callbacks; 
}

function run(stream_data)
{
  active_areas = activate_areas(stream_data, window.areas);
}

function destroy()
{
  window.areas = new Array();
  window.conditions = new Array();
  window.callbacks = new Array();
}

/*

= Area should be something like [H,W,P] where:

H = height, numeric
W = width, numeric
P = point, array [x,y] representing the upper left corner

= Stream data expected is: [[X,Y,Z], [X,Y,Z], ...]

X = horizontal position
Y = vertical position
Z = magnitued

*/
function activate_areas(stream_data, areas)
{
  active_areas = new Array();

  for (i = 0; i < areas.length ; i++)
  { 
    x = stream_data[0];
    y = stream_data[1];
      
    x_1 = areas[i][2][0];
    x_2 = x_1 + areas[i][0];
      
    y_1 = areas[i][2][1];
    y_2 = y_1 + areas[i][1];
    
    in_area = (y >= y_1) && (y <= y_2) && (x >= x_1) && (x <= x_2)
    
    if (in_area)
    {
      active_areas.push(i);
      callbacks[i]();
    }
  }
  
  return active_areas;
}