// drawing n lines, from some inner point to all sides, of equal steps along perimeter
// parameters:
int n = 20;      // n lines to be drawn
int sw = 1;      // initial stroke weight = line width
int s = 400;     // size of square canvas
int x0, y0;      // internal point to be connected

void setup() { 
  size (s, s);
  stroke(255);    // lines in white 
  x0 = int(random(0, s));
  y0= int(random(0, s));
  smooth();         // to render lines smooth
  background(0);
}

void draw() {
  // try to comment out the following line
  //background(0);
  strokeWeight(sw);
  translate(x0, y0);
  for (int j=0; j<n+1; j++) {
    line(0, 0, 1.5*s, 0); 
    rotate(2*PI/n);
  }
}

void keyPressed() {
  save("image.jpg");
}

void mousePressed() {
  // new random point is created
  x0 = int(random(0, s));
  y0= int(random(0, s));
}