1 /*

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

     3 *

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

     5 *

     6 * For the full copyright and license information, please view the LICENSE_FRONT

     7 * file that was distributed with this source code.

     8 */

     9 

    10 class particle

    11 {

    12   float x;

    13   float y;

    14   float xvel;

    15   float yvel;

    16   float temp;

    17   int pos;

    18   

    19   particle(float xIn, float yIn) {

    20     x = xIn;

    21     y = yIn;

    22   }

    23 

    24   void reposition() {

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

    26     y = random(HEIGHT-10,HEIGHT);

    27   

    28     xvel = random(-1,1);

    29     yvel = random(-1,1);

    30   }

    31 

    32   void updatepos() {

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

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

    35 

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

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

    38 

    39       float ax = (x%RES)/RES;

    40       float ay = (y%RES)/RES;

    41   

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

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

    44       

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

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

    47       

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

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

    50       

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

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

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

    54       

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

    56       

    57       x += xvel;

    58       y += yvel;

    59     }

    60     else {

    61       reposition();

    62     }

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

    64     

    65     xvel *= 0.6;

    66     yvel *= 0.6;

    67   }

    68 }