Sin Cos Wave - OpenProcessing

mySketch
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void setup () {
  size (600, 300);
}
​
void draw () {
  background (0);
  strokeWeight(2);
  stroke(255);
  line (0, height/2, width, height/2);
  noStroke();
​
  for (float i = 0; i < width-20; i += 5) {
    fill (255, 0, 0); //red
    float y = height/2 + sin (( i+(millis()/3) % width) / width*TWO_PI*2)* height/4; // height/4 is how high it is
    ellipse (i, y, 10, 10);
​
    fill (255, 255, 0); // yellow
    float y2 = height/2 + sin (( i+(millis()/3) % width) / width*TWO_PI*2 + PI)* height/4; 
    ellipse (i, y2, 10, 10);
  }
}
​