void mousePressed ()
{
  redraw();
}

void keyPressed ()
{
  if (keyCode == KeyEvent.VK_RIGHT)
  {
    actRandomSeed += 1;
    redraw ();
  }
  
    if (keyCode == KeyEvent.VK_LEFT)
  {
    actRandomSeed -= 1;
    redraw ();
  }
  
   //if (keyCode == KeyEvent.VK_S) saveFrame ("####.jpg");
}

int actRandomSeed = 4;

void setup ()
{
  size (700, 700);
  background (255);
  smooth();
  noLoop();
}

void draw ()
{
  background (0);
  randomSeed (actRandomSeed);
  createRadius ();
  
}

void createRadius ()
{
  int count = 0;
  int amount = 40;
  
  noFill ();
  
  while (count < amount)
  {
    
    float radius = random (60, height /2-30);
    float randomStrokeWeight = random (0.1,1);
    float a = 200-radius*0.80; // a = random (5, 80);
    a = constrain (a, 15, 170);
    
    stroke (255, a);
    strokeWeight (randomStrokeWeight);
    
    createDots (radius);
    count++;
  }
}

void createDots (float radius)
{
  int centerX = width /2, centerY = height /2;

  int count = 0;
  int amount = int (radius/5);

  float steps = TWO_PI / amount;
  float angle = 0;

  beginShape ();

  while (count < amount)
  {

    float x = centerX + cos (angle) * radius;
    float y = centerY + sin (angle) * radius;

    vertex (x,y);
    createCurve (20, angle, steps, radius, centerX, centerY, 30);


    angle += steps;
    count++;
  }

  endShape ();
}


void createCurve (int amount, float angle, float steps,  float radius, int centerX, int centerY, int maxSpacing)
{
  int count = 0;
  
  while (count < amount)
  {
    
    float randomX = random (-maxSpacing, maxSpacing);
    float randomY = random (-maxSpacing, maxSpacing);
    
    float randomAngleX = random (-steps, steps);
    float randomAngleY = random (-steps, steps);
    
    float x = centerX + cos (angle+randomAngleX) * (radius+randomX);
    float y = centerY + sin (angle+randomAngleY) * (radius+randomY);
    
    curveVertex (x,y);
    
    count++;
  }
}