/*
* This file is part of the TraKERS\Front Processing package.
*
* (c) IRI <http://www.iri.centrepompidou.fr/>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

class vbuffer
{
  int x;
  int y;
  float xvel;
  float yvel;
  float pressurex = 0;
  float pressurey = 0;
  float pressure = 0;
  
  vbuffer(int xIn,int yIn) {
    x = xIn;
    y = yIn;
    pressurex = 0;
    pressurey = 0;
  }
  
  void updatebuf(int i, int u) {
    if(i>0 && i<lwidth && u>0 && u<lheight) {
      pressurex = (v[i-1][u-1].xvel*0.5 + v[i-1][u].xvel + v[i-1][u+1].xvel*0.5 - v[i+1][u-1].xvel*0.5 - v[i+1][u].xvel - v[i+1][u+1].xvel*0.5);
      pressurey = (v[i-1][u-1].yvel*0.5 + v[i][u-1].yvel + v[i+1][u-1].yvel*0.5 - v[i-1][u+1].yvel*0.5 - v[i][u+1].yvel - v[i+1][u+1].yvel*0.5);
      pressure = (pressurex + pressurey)*0.25;
    }
  }
}