Javascript active area mechanism draft

active_area_mechanism

/*

So this is a basic mechanism to determin if a flow of positions land
in fixed rectangular areas. Depending on certain conditions for each areas
a callback is executed or no.

= 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

*/

var areas = new Array();
var conditions = new Array();
var callbacks = new Array();

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

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

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

function activate_areas(stream_data, areas)
{
  active_areas = new Array();
  for (i = 0; i < areas.length ; i++)
  {
    for (j = 0; j < stream_data.length ; j++)
    { 
      //x_1 = areas[i][2][0];
      //x_2 = areas[i][2][0] + areas[i][1];
      
      //y_1 = areas[i][2][1];
      //y_2 = areas[i][2][1] + areas[i][0];
      
      in_area = (((stream_data[j][1] < areas[i][2][1]) && ((areas[i][2][1] + areas[i][0]) < stream_data[j][1])) && ((stream_data[j][0] > areas[i][2][0]) && (stream_data[0] < (areas[i][2][0] + areas[i][1]))));
      
      if ((in_area) && (conditions.length > 0) && (conditions[i] != undefined) && (conditions[i]))
      {
        active_areas.push(i);
        callbacks[i]();
      }
    }
  }
  
  return active_areas;
}