p p[]; 
float globalZ=0;
 
void setup(){ 
  size(screen.width,screen.height-140); 
  smooth(); 
 
  p=new p[2000]; 
  for(int i=0; i<p.length; i++)    p[i]=new p(i/5000.0,  500,  500); 
} 
 
void draw(){ 
  fill(0,10); 
  rect(0,0,width,height);//fade background 

  noStroke();
  drawMap();
 
  stroke(255); 
  for(int i=0; i<p.length; i++) p[i].update();//render particles 
  
  globalZ+= map(mouseX, 0,width,  0.001,0.03); 
} 
 
 


 
void drawMap(){
  int step=8;
  float val;
  
  for(int i=0;i<width;i+=step){
    for(int j=0;j<height;j+=step){
	if (mouseY==0) val = 255;  // doar la inceput
	else val = noise(i/(float)mouseY,j/(float)mouseY, globalZ);

	  val = map(val,0,1,  -50,300);
	  
//	if (val<128) val=0;
//	else val=255;
	
	fill(val);
	rect(i,j,1,1);
    }
  }
}








 
void mousePressed(){
  println("----------");
  int rnd = round(random(2000));
  p[rnd].x=mouseX;
  p[rnd].y=mouseY;

}



 
class p {
  float id,x,y,xp,yp,s,d; 
 
  public p(float _id,float _x,float _y) { 
    id=_id; // prima valoare a "adincimi", Z pentru noise
    x=xp=_x; 
    y=yp=_y; 
    s=random(2,7); //speed
  } 
 
 
  void update(){ 
 
    id+=map(mouseX, 0,width,  0.001,0.05); 
    d=noise(x/(float)mouseY,y/(float)mouseY,globalZ)  *360;  // globalZ instead of id for continuity
  
    x+=cos(radians(d))*s; 
    y+=sin(radians(d))*s; 
 
    if(x<0) x=xp=width;//offscreen rewind 
    if(x>width)x=xp=0; 
    if(y<0) y=yp=height; 
    if(y>height)y=yp=0; 
 
    line(xp,yp,x,y); 
    xp=x; 
    yp=y; 
  } 
}