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HTML

              
                <div class="canvasWrap">
  <canvas width="1600" height="900" id="etch-a-sketch"></canvas>
  <div class="buttons">
    <button class="shake">Shake!</button>
  </div>
</div>
              
            
!

CSS

              
                body {
  min-height: 100vh;
  display: grid;
  align-items: center;
  justify-items: center;
  background: white;
  background: url(https://s3.amazonaws.com/media.locally.net/original/HABA_ALT_2017-08-02-13-22-45.jpg);
  background-size: cover;
}

canvas {
  border: 30px solid #e80000;
  border-radius: 10px;
  /* Set the width and height to half the actual size so it doesn't look pixelated */
  width: 800px;
  height: 450px;
  background: white;
}

canvas.shake {
  animation: shake 0.5s linear 1;
}

@keyframes shake {
  10%,
  90% {
    transform: translate3d(-1px, 0, 0);
  }

  20%,
  80% {
    transform: translate3d(2px, 0, 0);
  }

  30%,
  50%,
  70% {
    transform: translate3d(-4px, 0, 0);
  }

  40%,
  60% {
    transform: translate3d(4px, 0, 0);
  }
}

button {
  color: white;
  background: #d60087;
  padding: 0.5rem;
  border: 0;
  border: 2px solid transparent;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 2rem;
}

              
            
!

JS

              
                // grab canvas and it's context, plus the shake button
const canvas = document.querySelector("#etch-a-sketch");
const ctx = canvas.getContext("2d");
const shakebutton = document.querySelector(".shake");
const MOVE_AMOUNT = 10;

// setup the canvas for drawing
const { width, height } = canvas;
// randomize the starting point of the line
let x = Math.floor(Math.random() * width);
let y = Math.floor(Math.random() * height);

// set a hue amount to rainbow-ize the stroke!
let hue = 0;
ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
// set the style to be round instead of squar, and make the line size bigger
ctx.lineJoin = "round";
ctx.lineCap = "round";
ctx.lineWidth = MOVE_AMOUNT;

// this will actually start the line drawing, so the starting point shows on the page
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(x, y);
ctx.stroke();

// write a draw function
function draw({ key }) {
  // increment hue by 1 for each time
  hue += 3;
  ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
  ctx.beginPath();
  // go to where x & y used to be
  ctx.moveTo(x, y);
  // move x & y depending on key direction pressed
  switch (key) {
    case "ArrowUp":
      y -= MOVE_AMOUNT;
      break;
    case "ArrowDown":
      y += MOVE_AMOUNT;
      break;
    case "ArrowRight":
      x += MOVE_AMOUNT;
      break;
    case "ArrowLeft":
      x -= MOVE_AMOUNT;
      break;
    default:
      break;
  }
  ctx.lineTo(x, y);
  ctx.stroke();
}

// arrow key handlers
function handleKey(e) {
  if (e.key.includes("Arrow")) {
    // prevent the default, which is moving the screen
    e.preventDefault();
    draw({ key: e.key });
  }
}

// handle the shake button press, to clear the canvas
function clearCanvas() {
  canvas.classList.add("shake");
  ctx.clearRect(0, 0, width, height);
  // listen to animation end then remove class, so we can run function multiple times
  canvas.addEventListener(
    "animationend",
    function () {
      canvas.classList.remove("shake");
    },
    { once: true }
  );
  // remove the event listener with once, otherwise it will keep adding a new one each time we click the button
}

// listen for arrow key inputs
window.addEventListener("keydown", handleKey);

// listen for button click to clear canvas
shakebutton.addEventListener("click", clearCanvas);

              
            
!
999px

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