gistfile1.pde

float startAngle;
float angleVel;
float amp;

void setup() {
  startAngle = 0;
  angleVel = 0.4;
  amp = 100;
  size(500, 500);
}

void draw() {
  background(255);
  float angle = startAngle;
  for (int x = 0; x < width; x += 25) {
    float y = amp * sin(angle);
    ellipse(x, y + height/2, 25, 25);
    angle += angleVel;
  }
  startAngle += 0.04;
}