import processing.video.*; 
import blobDetection.*;
import traer.physics.*;

ParticleSystem physics;
Particle last;

Capture cam; 
BlobDetection theBlobDetection; 
PImage img; 
boolean newFrame=false; 

void setup() 
{ 
  size(640, 480); 

  // camera
  cam = new Capture(this, 320, 240, 15);

  // blobdetection
  img = new PImage(320,240);
  theBlobDetection = new BlobDetection(img.width, img.height); 
  theBlobDetection.setPosDiscrimination(true); 
  theBlobDetection.setThreshold(0.15f); // will detect bright areas whose luminosity > 0.2f;

  // particles
  physics = new ParticleSystem( -0.1, 0.001 );
} 

void captureEvent(Capture cam) 
{ 
  cam.read(); 
  newFrame = true; 
} 

void draw() 
{
  if (newFrame) 
  {
    background(100);
    newFrame=false;
    theBlobDetection.computeBlobs(cam.pixels);
    drawBlobs(); 
  }

  // particles
  physics.tick();
  for ( int i = 0; i < physics.numberOfParticles(); ++i )
  {
    Particle p = physics.getParticle( i );
    noStroke();
    fill( 250, 255/(p.age()*+1) );
    ellipse( p.position().x(), p.position().y(), 5, 5 );
    if ( p.age() > 20 )
      p.kill();
  }
}

void drawBlobs() 
{
  Blob b;
  EdgeVertex eA,eB;

  for (int n=0 ; n<theBlobDetection.getBlobNb() ; n++) 
  {

    b=theBlobDetection.getBlob(n); 

    for (int m=0; m<b.getEdgeNb(); m+=5) 
    { 
      eA = b.getEdgeVertexA(m); 
      eB = b.getEdgeVertexB(m); 
      if (eA !=null && eB !=null)
      {
        // particles
        Particle p = physics.makeParticle( 1.0f, eA.x*width, eA.y*height, 0 );
        p.setVelocity( random( -1, 1 ), random( -2, -5 ), 0 );
        if ( last != null )
          physics.makeSpring( p, last, 0.1f, 0.1f, 10 );
        last = p;
      }
    }
  }
}