​

function setup() {

  createCanvas(650, 700);

}

​

function draw() {

  background(255);

  let moving = -0.3;

  let alt = height * 0.8;

​

​

  push();

  translate(0, height * 0.5);

  let oldval = 0;

  let val = 0;

  let offset = 1000+moving*frameCount*0.03;

  for (let ni = -1; ni < width; ni++) {

    oldval = val;

    val = noise(ni * 0.01 + offset) * 100.0;

    line(ni, oldval, ni + 1, val);

  }

  pop();

​

  push();

  translate(0, height * 0.3);

  oldval = 0;

  val = 0;

  offset = 2000-moving*frameCount*0.02;

  for (let ni = -1; ni < width; ni++) {

    oldval = val;

    val = noise(ni * 0.01 + offset) * 100.0;

    line(ni, oldval, ni + 1, val);

  }

  pop();

​

  push();

  translate(0, height * 0.7);

  oldval = 0;

  val = 0;

  offset = 3000+moving*frameCount*0.01;

  for (let ni = -1; ni < width; ni++) {

    oldval = val;

    val = noise(ni * 0.01 + offset) * 100.0;

    line(ni, oldval, ni + 1, val);

  }

  pop();

​

  push();

  translate(width / 2, height * 0.9);

​

  // Pupil

  stroke(0);

  strokeWeight(1.2);

  fill(220);

  ellipse(0, 0, width * 0.5, height * 0.05);

​

  let theta = -16 * PI / 180;

​

  if (show[0]) {

    // GS 1

    strokeWeight(1.2);

    stroke(255, 0, 0);

    line(-width / 4, 0, -width / 4 + alt * sin(theta), -alt);

    line(width / 4, 0, width / 4 + alt * sin(theta), -alt);

    strokeWeight(0.5);

    line(0, 0, alt * sin(theta), -alt);

    noStroke();

    fill(255, 0, 0, 20);

    rhombus(theta, alt, width / 2);

    fill(255, 0, 0);

    text("Guide Star 1",-40+alt*sin(theta),-alt-10)

  }

​

  if (show[1]) {

    // GS 2

    theta = -theta;

    strokeWeight(1.2);

    stroke(255, 0, 0);

    line(-width / 4, 0, -width / 4 + alt * sin(theta), -alt);

    line(width / 4, 0, width / 4 + alt * sin(theta), -alt);

    strokeWeight(0.5);

    line(0, 0, alt * sin(theta), -alt);

    noStroke();

    fill(255, 0, 0, 20);

    rhombus(theta, alt, width / 2);

    fill(255, 0, 0);

    text("Guide Star 2",-30+alt*sin(theta),-alt-10)

  }

​

  if (show[2]) {

    // Target

    theta = 0;

    strokeWeight(1.2);

    stroke(0, 0, 255);

    line(-width / 4, 0, -width / 4 + alt * sin(theta), -alt);

    line(width / 4, 0, width / 4 + alt * sin(theta), -alt);

    strokeWeight(0.5);

    line(0, 0, alt * sin(theta), -alt);

    noStroke();

    fill(0, 0, 255, 40);

    rhombus(0, alt, width / 2);

    fill(0, 0, 255);

    text("Target",-20+alt*sin(theta),-alt-10)

  }

  pop();

}

​

function rhombus(angle, alt, base) {

  beginShape();

  vertex(-base / 2, 0);

  vertex(-base / 2 + alt * sin(angle), -alt);

  vertex(base / 2 + alt * sin(angle), -alt);

  vertex(base / 2, 0);

  endShape();

}