Joystick

Code

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HTML

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
</head>
<body>
  
  <div id="board">
    <canvas id="game-board" width="2000" height="3000"></canvas>

    <div id="joystick">
      <button id="top-btn">△</button>
      <button id="left-btn">◁</button>
      <button id="right-btn">▷</button>
      <button id="bottom-btn">▽</button>
    </div>
  </div>
  <button id="reset-square" onclick="reset()">Reset</button>

</body>
</html>

CSS

* {
    box-sizing: border-box;
    
    margin: 0;
    padding: 0;
    
    -webkit-tap-highlight-color: transparent;
}

html {
    width: 100%;
    height: 100%;
}

body {
    width: 100%; 
    height: 100%;
}

#board {
    aspect-ratio: 2 / 3;
    position: relative;

    margin: 0 auto;
}

#game-board {
    width: 100%;
    height: 100%;
    aspect-ratio: 2 / 3;
    
    border: 1px solid red;
}

#joystick {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 1.5vw;
    
    position: absolute;
    bottom: 3vw;
    left: 3vw;
}

#joystick button {
    aspect-ratio: 1 / 1;
    
    border: 0.2vw solid #C0C0C0;
    
    font-size: 6vw;
    
    color: #C0C0C0;
    background-color: transparent;
    
    outline: none;
}

#joystick button:active {
    border-color: #505050;
    color: #505050;
}

#top-btn {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
}

#left-btn {
    grid-column: 1 / 2;
    grid-row: 2 / 3;
}

#right-btn {
    grid-column: 3 / 4;
    grid-row: 2 / 3;
}

#bottom-btn {
    grid-column: 2 / 3;
    grid-row: 3 / 4;
}

@media (orientation: landscape) {
    #joystick {
        gap: 0.9vh;
    
        bottom: 1.8vh;
        left: 1.8vh;
    }

    #joystick button {
        border-width: 0.12vh;
    
        font-size: 3.6vh;
    }
}

#reset-square {
    display: flex;
    align-items: center;
    justify-content: center;
    
    width: calc(100% - 10rem);
    
    margin: 1rem 5rem;
    padding: 0.25rem;
    border: 2px solid #C0C0C0;
    border-radius: 20px;
    
    font-weight: bold;
    
    color: #404040;
    background-color: #FFFFFF;
    
    outline: none;
}

JavaScript

/* Resize Board */
const html = document.getElementsByTagName("html")[0];
const board = document.getElementById('board');
const canvas = document.getElementById('game-board');
const ctx = canvas.getContext('2d');
const joystick = document.getElementById('joystick');

function resizeBoard() {
  const width = window.innerWidth;
  const height = window.innerHeight;
  
  html.style.width = width + "px";
  html.style.height = height + "px";
  
  if (width > height) {
    board.style.maxWidth = "auto";
    board.style.maxHeight = height * 0.8 + "px";
  } else if (height > width) {
    board.style.maxWidth = width;
    board.style.maxHeight = height * 0.8 + "px";
  }
}

window.addEventListener("resize", resizeBoard);
resizeBoard();
/* /Resize Board */





/* Move */
const btns = joystick.getElementsByTagName("button");

let x = 50;
let y = 50;
ctx.fillStyle = 'skyblue';
ctx.fillRect(x, y, 100, 100);

[...btns].forEach((btn, i) => {
  btn.addEventListener("pointerdown", (e) => {
    e.preventDefault();
    const press = setInterval(() => {
      move(i)
    }, 1);
    
    btn.addEventListener("touchend", () => {
      clearInterval(press);
    });
  });
});

function move(tlrb) {
  switch (tlrb) {
    case 0:   // Top
      ctx.fillStyle = '#FFFFFF';
      ctx.fillRect(x, y, 100, 100);
      y -= 10;
      ctx.fillStyle = 'skyblue';
      ctx.fillRect(x, y, 100, 100);
      break;
    case 1:   // Left
      ctx.fillStyle = '#FFFFFF';
      ctx.fillRect(x, y, 100, 100);
      x -= 10;
      ctx.fillStyle = 'skyblue';
      ctx.fillRect(x, y, 100, 100);
      break;
    case 2:   // Right
      ctx.fillStyle = '#FFFFFF';
      ctx.fillRect(x, y, 100, 100);
      x += 10;
      ctx.fillStyle = 'skyblue';
      ctx.fillRect(x, y, 100, 100);
      break;
    case 3:   // Bottom
      ctx.fillStyle = '#FFFFFF';
      ctx.fillRect(x, y, 100, 100);
      y += 10;
      ctx.fillStyle = 'skyblue';
      ctx.fillRect(x, y, 100, 100);
      break;
  }
}

function reset() {
  ctx.fillStyle = '#FFFFFF';
  ctx.fillRect(x, y, 100, 100);
  x = 950;
  y = 1450;
  ctx.fillStyle = 'skyblue';
  ctx.fillRect(x, y, 100, 100);
}
/* /Move */

For Practice

Last updated: Oct 22, 2025