/** 
random lineart by <a href="http://www.local-guru.net/blog/">guru</a>
*/

PVector p1;
PVector p2;
PVector d1;
PVector d2;


void setup() {
  size(300,300);
  smooth();
  p1 = new PVector( random(width), random( height ));
  p2 = new PVector( random(width), random( height ));
  
  d1 = new PVector( random(width), random( height ));
  d2 = new PVector( random(width), random( height ));

  d1.normalize();
  d2.normalize();
  d1.mult(4);
  d2.mult(4);
  
  background(0);

}

void draw() {
  stroke(255,100);
  line( p1.x,p1.y, p2.x, p2.y );  

  p1.add( d1 );
  p2.add( d2 );
  
  if ( p1.x > 300 || p1.x < 0 ) d1.x = -d1.x * random(0.8,1.2);
  if ( p1.y > 300 || p1.y < 0 ) d1.y = -d1.y * random(0.8,1.2);
  if ( p2.x > 300 || p2.x < 0 ) d2.x = -d2.x * random( 0.8,1.2);
  if ( p2.y > 300 || p2.y < 0 ) d2.y = -d2.y * random( 0.8,1.2);
  
  if ( p1.x > 300 ) p1.x = 300;
  if ( p1.y > 300 ) p1.y = 300;
  if ( p2.x > 300 ) p2.x = 300;
  if ( p2.y > 300 ) p2.y = 300;
  if ( p1.x < 0 ) p1.x = 0;
  if ( p1.y < 0 ) p1.y = 0;
  if ( p2.x < 0 ) p2.x = 0;
  if ( p2.y < 0 ) p2.y = 0;
  
  
}

void mousePressed() {
  background(0);
}