/*

* This file is part of the TraKERS\Front Processing package.

*

* (c) IRI <http://www.iri.centrepompidou.fr/>

*

* 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;

    }

  }

}