void setup()
{
  size(500, 500);
  background(0);
  strokeWeight(4);
  colorMode(HSB);
  frameRate(10);
}

void draw()
{
  fill(0, 10);
  noStroke();
  rect(0, 0, width, height);
}

void circle(float x, float y, float diameter)
{
  ellipse(x, y, diameter, diameter);
}

void aline(float x, float y, float angle, float len)
{
  line(x, y, x + cos(angle)*len, y + sin(angle)*len);
}

void burst(float x, float y, float len)
{
  for (float deg = 0; deg<360; deg = deg + 10) {
    aline(x, y, radians(deg), len);
  }
}

void polygon(float x, float y, int numSides, int step, float diam)
{
  float startAngle, endAngle;
  float startx, starty, endx, endy;
  float len;

  len = diam/2.0;
  for (int i = 0; i<numSides; i = i + 1) {
    startAngle = (360.0/numSides)*i;
    endAngle = (360.0/numSides)*(i+step);

    startx = x + cos(radians(startAngle))*len;
    starty = y + sin(radians(startAngle))*len;
    endx = x + cos(radians(endAngle))*len;
    endy = y + sin(radians(endAngle))*len;

    line(startx, starty, endx, endy);
  }
}

void mouseClicked()
{
  int numSides;
  
  stroke(random(255), 255, 255);
  numSides = int(random(3, 10));
  polygon(mouseX, mouseY, numSides, int(random(1, numSides)), random(100));
}