Super

float em = 16; //#vertices

​

void setup(){

  //background(0);

  size(500, 500);

  noFill();

  stroke(255);

  strokeWeight(2);

  smooth();

}

​

void draw() {

  background(0);

  text("# of vertices: " + int(em), 10, 20);

​

  translate(width/2, height/2);

​

  beginShape();

  //addd vertices

  for (float theta = 0; theta <= 2* PI; theta += 0.01){

   float rad = r(theta,

   2,  //a

   2,  //b

   em,  //m

   1,  //n1

   mouseX /200.0,  //n2

   mouseY /200.0   //n3

   );

   float x = rad * cos(theta)* 50;

   float y = rad * sin(theta)* 50;

   vertex(x,y);

  }

  endShape();

}

​

float r(float theta, float a, float b, float m, float n1, float n2, float n3) {

  return pow(pow(abs(cos(m* theta / 4.0) / a),n2)  +  

  pow(abs(sin(m* theta / 4.0) / b),n3), -1.0 /n1) ;

}

​

void keyReleased(){

    if(keyCode == UP){ em = em+2;}

    if(keyCode == DOWN){ em = em-2;}

}