Particles performing Brownian random walk - processing

random-walk-1.pde

// processing script to simulate Brownian random motion

int n_particles = 200; // number of particles

// prepare arrays to store particle coordinates
float[] x = new float[n_particles];
float[] y = new float[n_particles];

void setup() {
  size(512, 512);
  background(0);
  
  // draw particles at random positions
  stroke(0, 200, 0, 200);
  fill(0, 200, 0, 200);
  for (int i=0; i<n_particles; i++){
    x[i] = random(0, 512);
    y[i] = random(0, 512);
    ellipse(x[i], y[i], 2, 2);
  }
}

void draw() {
  // update particle positions
  background(0);
  for (int i=0; i<n_particles; i++){
    x[i] += randomGaussian();
    y[i] += randomGaussian();
    ellipse(x[i], y[i], 2, 2);
  }
}