float x, y, diam, number, xroma;
int i;

void setup() {
  size(640, 360);
  background(51);
  noStroke();
  noLoop();
}

void draw() {
  // O protos kyklos tha emfanistei sto kentro toy parathyroy
  // kai tha exei diametro 300 kai mayro xroma. Theloume 5 kykloys.
  x = width/2;
  y = height/2;
  diam = 300;
  number = 5;
  xroma = 0;

  fill(xroma);
  ellipse(x, y, diam, diam);


  // Kathe epomenos kyklos tha exei idio kentro, alla diametro mikroteri
  // kata 300/number apo ti diametro toy proigoumenou kykloy. 
  // Kai xroma megalytero (dil. pio anoixtoxromo) kata 255/number.
  
  // Ayto theloume na to epanalavoume 4 fores, dil. number-1 fores.
  // Mia voliki entoli gia na epanalamvanetai mia omada entolon oses
  // fores theloume, einai i entoli FOR
  
  for (i=1; i<=number-1; i++)
  {
    diam = diam - 300/number;
    xroma = xroma + 255/number;

    fill(xroma);
    ellipse(x, y, diam, diam);  
  } // telos for
  
  
} // telos draw