pendulum wave

gistfile1.pde

final float WAVE_HEIGHT = 16;
final float SPACING = 1;
final int NUM_BALL = 32;
final int BALL_RADIUS = 1;
int timeStep = 0;

//WAVE_HEIGHT, SPACING, and NUM_BALL all affect the size of the window. BALL_RADIUS does not.
void setup() {
  size((int)(WAVE_HEIGHT * 2), (int)(WAVE_HEIGHT * 2));
  /* 
  stroke(255);
  noFill();
  */
  fill(255);
  noStroke();
  ellipseMode(CENTER);
}

void draw() {
  background(0);
  for (int i = 0; i < NUM_BALL; i++) {
      ellipse(SPACING * i, getY(i, timeStep), BALL_RADIUS, BALL_RADIUS);
  }
  timeStep++; // += 2 to go faster
}

float getY(int i, int t) {
    return WAVE_HEIGHT * (1 + sin((float)(timeStep * (i / 500f + 0.02f)) % TWO_PI));
}