ArrayList<Snake> snakes = new ArrayList<Snake>();


void setup(){
   size(500,500); 
   
      strokeWeight(10);
 /*
   currentSnake = new Snake(100,100);
     currentSnake.add(150,150);
     currentSnake.add(200,100);
     currentSnake.add(250,150);
     currentSnake.makeReal();
     snakes.add(currentSnake);*/
}

void keyPressed(){
snakes = new ArrayList<Snake>();
  currentSnake = null;
}

Snake currentSnake = null;
void mousePressed(){
  currentSnake = new Snake(mouseX,mouseY);
 
}
void mouseDragged(){
  if(currentSnake != null) currentSnake.add(mouseX,mouseY);
  
}
void mouseReleased(){
   if(currentSnake != null) {
     currentSnake.makeReal();
     snakes.add(currentSnake);
   }
   currentSnake = null;
}

void draw(){
background(50);
if(currentSnake != null) currentSnake.drawBasic();

  for(Snake s : snakes){
    s.drawReal(); 
   
  }
}



class Snake{
  
    float t = 0,ts;
  
    ArrayList<Point> points = new ArrayList<Point>();
    float x,y;
    Snake(float px, float py){
      x = px;
      y = py;
    }
    void add(float px, float py){
      points.add(new Point(px,py));
    }
    void drawBasic(){
      stroke(0);
       float lx = x; float ly = y;
      for(Point p : points){
         line(lx,ly,p.x,p.y);
         lx = p.x; ly = p.y;
      } 
    }
    color c;
    ArrayList<Seg> segs = new ArrayList<Seg>();
    void makeReal(){
     t = random(-.005,.005);
     c = color(random(150,255),random(150,255),random(150,255));
     float lx = x; float ly = y;
      for(Point p : points){
         float a = atan2(p.y-ly,p.x-lx);
         float d = dist(p.x,p.y,lx,ly);
         segs.add(new Seg(d,a));
         lx = p.x; ly = p.y;
      } 
    }
    
    void drawReal(){
      stroke(c);
     float ox = x; float oy = y;


    float nt = t;
    t +=ts;
    ts += random(-.01,.01);
    
    if(abs(ts) > .008) ts = ts /2;

      for(Seg s : segs){
         s.update(nt);
        nt += t; 
        float nx = ox + (cos(s.a) * s.d) ;
         float ny = oy + (sin(s.a) * s.d) ;
         line(ox,oy,nx,ny);
         ox = nx; oy = ny;
         
      }
    
    }
    
    
}

class Seg{
  float d,a,as;
 Seg(float pd, float pa){
    d = pd;
    a = pa;
    as = 0;
 } 
 void update(float t){
   //as += random(-.1,.1);
   //a += t;
  as += pmrandom(.03);
  a += as;
  if(abs(as) > .3) as = .3 * as / abs(as);
  
 }
}

class Point{
  float x,y;
 Point(float px, float py){
    x = px;
    y = py;
 } 
}

float pmrandom(float v){
 return random(-v,v); 
}