Particle[] particles;
int numParticles = 10000;
boolean lines = false;
int w = 400;
int h = 400;

void setup()
{
  size(w, h);
  background(0);
  particles = new Particle[numParticles];
  for(int i=0;i<numParticles;i++)
  {
    particles[i] = new Particle();
    particles[i].x = random(w);
    particles[i].y = random(h);
    particles[i].vx = random(-1, 1);
    particles[i].vy = random(-1, 1);
  }
}

void draw()
{
  fill(0, 50);
  rect(0, 0, w, h);
  for(int i=0;i<numParticles;i++)
  {
    particles[i].move();
    particles[i].render();
  }  
}

void mousePressed()
{
  lines = !lines;
  for(int i=0;i<numParticles;i++)
  {
    particles[i].lines = lines;
  }
}