jluserov_generativedesign/libro03_circulosconcentricos/libro03_circulosconcentricos.pde
int diam = 10;
float centX, centY;
void setup() {
  size(500, 300);
  frameRate(24);
  smooth();
  background(180);
  centX = width/2;
  centY = height/2;
  stroke(0);
  strokeWeight(1);
  noFill();
}
void draw() {
  if (diam <= 400) {
  // background(180); comment out this line
  ellipse(centX, centY, diam, diam);
  diam += 10;
  }
}
