void setup()
{
  size(800, 800);
  background(0);
}

void draw()
{
  float x, y;
  int numSides;
  float dist;

  x = random(width);
  y = random(height);
  numSides = 6;
  dist = 100;
  polygon(x, y, numSides, dist);
  frameRate(1);
}

void polygon(float x, float y, int numSides, float dist)
{
  float angle1, angle2;
  float delta;

  stroke(255, 0, 0);
  strokeWeight(4);
  delta = 2*PI/numSides;  // 2*PI radians in a circle
  for (int i=0; i<numSides; i++) {
    angle1 = delta * i;
    angle2 = delta * i + delta;
    line(x + dist * cos(angle1), 
      y + dist * sin(angle1), 
      x + dist * cos(angle2), 
      y + dist * sin(angle2));
  }
}