import traer.physics.*;

ParticleSystem physics;
Particle last;

void setup()
{
  size( 400, 400 );	
  fill( 255, 64 );
  framerate( 24 );
  physics = new ParticleSystem( -0.1, 0.001 );
  ellipseMode( CENTER );
  smooth();
  cursor( CROSS );
}

void draw()
{
  for ( int i = 0; i < 5; i++ )
  {
    Particle p = physics.makeParticle( 1.0f, mouseX, mouseY, 0 );
    p.setVelocity( random( -1, 1 ), random( -2, -5 ), 0 );
    if ( last != null )
      physics.makeSpring( p, last, 0.1f, 0.1f, 10 );
    last = p;
  }
  physics.tick();
  background( 255 );

  noStroke();
  for ( int i = 0; i < physics.numberOfParticles(); ++i )
  {
    Particle p = physics.getParticle( i );
    fill( 0, 255/(p.age()+1) );
    ellipse( p.position().x(), p.position().y(), 20, 20 );
    if ( p.age() > 96 )
      p.kill();
  }
}