// draws a red point every 1/8th of a circle centered at the
// middle of the screen
void setup() {
  size(600, 600);
  noStroke();
  fill(255, 0, 0);
  
  int steps = 8;
  int radius = 50;
  int centerx = width/2;
  int centery = height/2;
  
  float angle = 2*PI/steps;
  for (int i=0; i<steps; i++) {
    float x = cos(angle*i)*radius + centerx;
    float y = sin(angle*i)*radius + centery; 

    ellipse(x, y, 10, 10);
  }
}