public void update(float db) {
// we can use the db value here to change the speed of the particles
loc.add(vel.mult(vel, map(db, -100, 100, .05f, 5)));
if (loc.x < 0 || loc.x > width) {
vel.x *= -1;
}
if (loc.y < 0 || loc.y > height) {
vel.y *= -1;
}
radius = constrain(db, 2, 100);
}
