int NUM_BLOBS=100;
boolean keyp=false;

class Blob
{
  float x,y,vx,vy;
  color c;
  int r;
  BGraphics target;
//  Blob(int _x, int _y, BGraphics _target)
  Blob(int _x, int _y, int _r, BGraphics target)
  {
    x=_x;
    y=_y;
    r=_r;
    vx=random(-2,2);
    vy=random(-2,2);
//    target=_target;
    c=color(int(random(255)),int(random(255)),int(random(255)),32);
    
  }
  
  void Draw()
  {
    float closest=width*height;
    int k;
    boolean found=false;
    for(int i=int(y-r);i<int(y+r);i++)
    {
      k=i*width;
      if(i>=0&&i<height)
      {
        for(int j=int(x-r);j<int(x+r);j++)
        {
          if(j>=0&&j<width)
          {
            if((overlay.pixels[j+i*width]&0x000000FF)==0)
            {
              found=true;
              int xd=i-int(y);
              int yd=j-int(x);
              if(sqrt(xd*xd+yd*yd)<closest)
              {
                closest=sqrt(xd*xd+yd*yd);
              }
            }
          }
        }
      }
    }
    if(!found)
    {
      closest=width*height;
    }
    if(closest<r)
    {
      int diam=r-int(closest);
      int alpha=254-int((255.0/float(r))*closest);
      fill(red(c),green(c),blue(c),alpha);
      noStroke();
//      ellipse(x-(diam/2),y-(diam/2),x+(diam/2),y+(diam/2));
      ellipse(x-(diam/2),y-(diam/2),diam,diam);
    }
    else
    {
      noStroke();
      fill(red(c),green(c),blue(c),128);
      ellipse(x-1,y-1,2,2);
//      ellipse(x-1,y-1,2,2);
    }
  }
  
  void Move()
  {
    if(x+vx<=0 || x+vy>width)
    {
      vx=-vx;
    }
    if(y+vy<=0 || y+vy>height)
    {
      vy=-vy;
    }
    x+=vx;
    y+=vy;
  }
}

class Curvepoint
{
  float x,y,vx,vy;
  Curvepoint(float _x, float _y)
  {
    x=_x;
    y=_y;
    vx=random(-5,5);
    vy=random(-5,5);
  }
  
  void Move()
  {
    if(x+vy>=width || x+vy<0)
    {
      vx=0-vx;
      vx+=random(-0.5,0.5);
    }
    if(y+vy>=height || y+vy<0)
    {
      vy=0-vy;
      vy+=random(-0.5,0.5);
    }
    x+=vx;
    y+=vy;
  }
  
}

Blob[] blobs;
Curvepoint[] points;
BGraphics overlay;

void setup()
{
  size(400,400);
  overlay=new BGraphics(width,height);
  overlay.stroke(0);
  overlay.background(0);
  
  noStroke();
  background(255,255,255);
  
  blobs=new Blob[NUM_BLOBS];
  points=new Curvepoint[8];
  int a=int(sqrt(blobs.length));
  for(int i=0;i<blobs.length;i++)
  {  
    blobs[i]=new Blob(((width/a)/2)+i%a*(width/a),((height/a)/2)+(i/a)*(height/a),width/a,overlay);
  }
  for(int i=0;i<points.length;i++)
  {
    points[i]=new Curvepoint(random(width),random(height));
  }
}

void loop()
{
  background(255,255,255);
  overlay.background(255,255,255);
  stroke(0);
  overlay.beginShape(LINE_STRIP);
  {
    for(int i=0;i<points.length;i++)
    {
      overlay.curveVertex(points[i].x,points[i].y);
      points[i].Move();
    }
  }
  overlay.endShape();
  for(int i=0;i<blobs.length;i++)
  {
    blobs[i].Draw();
//    blobs[i].Move();
  }
  if(keyp)
  {
    setup();
    keyp=false;
  }
}

void keyPressed()
{
  if(key=='a' && NUM_BLOBS<12800)
  {
    NUM_BLOBS*=2;
    keyp=true;
  }
  if(key=='z' && NUM_BLOBS>25)
  {
    NUM_BLOBS/=2;
    keyp=true;
  }
}