Espiral

ArrayList points;

int counter;

double step, theta;

PVector dummy;

void setup(){

frameRate(10);//instruccion para acelerar la ejecucion

size(500,500);

background(600);

stroke(98);

fill(168);

points = new ArrayList();

dummy = new PVector(0,0);

counter=0;

theta=0;

step = Math.PI/40;

}


void draw(){
  float actx = 0;
  float acty = 0;
  float h = 300;
  float k = 150;
  float r = counter;
  background(255, 300, 100);//color cambia
  actx=h;
  acty=h;
  //for(float theta=0; theta < 2* Math.PI; theta+=step)
  if(theta<9*Math.PI)//controlador de vueltas
  { float x = (float)(h+r*Math.cos(theta));
  float y = (float)(k - r*Math.sin(theta));
  //point(x,y);
  pint p = new pint(x,y,counter); points.add(p);
  ellipse(x,y,5,10);
  counter++;
  theta+=step;
  trace();
  }
}

void trace(){
  for(int i=0; i<points.size()-2;i++){
  pint p1 = (pint) points.get(i);
  pint p2 = (pint) points.get(i+1);
  if(p1.index==p2.index-1)
   line(p1.x,p1.y,p2.x,p2.y);
  }
}
  class pint extends PVector{
    float x,y;
    float index;
   
    pint(float x_,float y_,float i){
      x = x_;
      y = y_;
      index = i;
    }
  }