final static short FPS = 0300, PITCH = 440;
final static short AMP = 0100, LEN = 0150;
final static float GAP = 0.1, BOLD = 1.5;
final static color BG  = -1;

// JAVA2D, P2D, P3D, OPENGL:
final static String ENGINE = P2D;

void setup() {
  size(500, 200, ENGINE);
  frameRate(FPS);
  smooth();
  strokeWeight(BOLD);
}

void draw() {
  background(BG);

  final float hh = height>>1, posX = frameCount % width;

  for (float i = posX + LEN; i > posX; i -= GAP)
    point(i, hh + sin(PITCH * i) * AMP);
}

void mousePressed() {
  if (looping)    noLoop();
  else            loop();
}

void keyPressed() {
  mousePressed();
}