/*

* 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_FRONT

* file that was distributed with this source code.

*/

class particle

{

  float x;

  float y;

  float xvel;

  float yvel;

  float temp;

  int pos;

  particle(float xIn, float yIn) {

    x = xIn;

    y = yIn;

  }

  void reposition() {

    x = WIDTH/2+random(-20,20);

    y = random(HEIGHT-10,HEIGHT);

    xvel = random(-1,1);

    yvel = random(-1,1);

  }

  void updatepos() {

    int vi = (int)(x/RES);

    int vu = (int)(y/RES);

    if(vi > 0 && vi < lwidth && vu > 0 && vu < lheight) {

      v[vi][vu].addcolour(2);

      float ax = (x%RES)/RES;

      float ay = (y%RES)/RES;

      xvel += (1-ax)*v[vi][vu].xvel*0.05;

      yvel += (1-ay)*v[vi][vu].yvel*0.05;

      xvel += ax*v[vi+1][vu].xvel*0.05;

      yvel += ax*v[vi+1][vu].yvel*0.05;

      xvel += ay*v[vi][vu+1].xvel*0.05;

      yvel += ay*v[vi][vu+1].yvel*0.05;

      v[vi][vu].yvel -= (1-ay)*0.003;

      v[vi+1][vu].yvel -= ax*0.003;

      //v[vi][vu+1].yvel -= ay*0.003;

      if(v[vi][vu].yvel < 0) v[vi][vu].yvel *= 1.00025;

      x += xvel;

      y += yvel;

    }

    else {

      reposition();

    }

    if(random(0,400) < 1) reposition();

    xvel *= 0.6;

    yvel *= 0.6;

  }

}