Hi, I'm simply trying to draw a few concentric circles with two colors but it's not working properly.
I can't see the problem. Any suggestions?

1. Heart loops;
   color col = color(255, 0, 0);
   color col2 = color(0, 0, 255);
   
   void setup() {
     size(800, 800);
     background(255);
     smooth();
     loops = new Heart(width/2, height/2, 800, 30);
   }
   
   void draw() {  
     loops.drawCircle();
   }
   
   class Heart {
     int x, y;
     int dia;
     int steps;
     Heart(int _x, int _y, int _dia, int _steps) {
       x = _x;
       y = _y;
       dia = _dia;
       steps = _steps;
     }
     void drawCircle() {
       for (int i = dia; i > 0; i-=steps) {
         if (i%(2 * steps) == 0) {       
           fill(col);
         }
         else
         {
           fill(col2);
         }
         ellipse(x, y, i, i);
       }
     }
   }