controlP5 acting up

Here is a simple problem, but I can't seem to figure out why the sliders won't adjust the values of the recursion. Thanks in advance.

//hexagonal fractal
import controlP5.*;
ControlP5 cp5;

int radius = 400;
int num  = 4;

void setup() {
  size(800, 800);
  background(32);
  cp5 = new ControlP5(this);

  smooth();
  noFill();
  noLoop();
  frameRate(2);

  cp5.addSlider("num")
    .setRange(0, 6)
    .setPosition(100, 100)
    .setSize(10, 100)
    .setNumberOfTickMarks(5)
    ;

  cp5.addSlider("radius")
    .setRange(150,450)
    .setPosition(0, 100)
    .setSize(10, 100)
    .setNumberOfTickMarks(5)
    ;
}

void draw() {
  translate(width/2, height/2);
  drawHexagon(radius, num);
}

void drawHexagon(float radius, int num ) {
  stroke(255);
  float x, y = 0;
  beginShape();
  for (int i = 0; i < 6; i++) {
    x = cos(radians(60*i))*radius;
    y = sin(radians(60*i))*radius;
    vertex(x, y);
  }
  endShape(CLOSE);
  //////////////////////////////////////////////////////////////

  if (num-- > 1) {

    pushMatrix();
    translate(radius/2, 0);
    drawHexagon(radius/2, num);
    popMatrix();

    pushMatrix();
    translate(-radius/4, -radius*cos(radians(30))/2);
    drawHexagon(radius/2, num);
    popMatrix();

    pushMatrix();
    translate(-radius/4, radius*cos(radians(30))/2);
    drawHexagon(radius/2, num);
    popMatrix();
  }
}