JSFiddle - React, Tailwind, and code Playground

by totoromaum

HTML

<!DOCTYPE html>
<html>

  <head>
    <title>Keyboard input</title>
  </head>

  <body>
    <canvas id="canvas" width="400" height="400"></canvas>
    <script src="https://code.jquery.com/jquery-2.1.0.js"></script>
    <script>
      var ctx = canvas.getContext("2d");
      var width = canvas.width;
      var height = canvas.height;
      var circle = function(x, y, radius, fillCircle) {
        ctx.beginPath();
        ctx.arc(x, y, radius, 0, Math.PI * 2, false);
        if (fillCircle) {
          ctx.fill();
        } else {
          ctx.stroke();
        }
      };
      // The Ball constructor
      var Ball = function() {
        this.x = width / 2;
        this.y = height / 2;
        this.xSpeed = 5;
        this.ySpeed = 0;
      };
      // Update the ball's position based on its speed
      Ball.prototype.move = function() {
        this.x += this.xSpeed;
        this.y += this.ySpeed;
        if (this.x < 0) {
          this.x = width;
        } else if (this.x > width) {
          this.x = 0;
        } else if (this.y < 0) {
          this.y = height;
        } else if (this.y > height) {
          this.y = 0;
        }
      };
      // Draw the ball at its current position
      Ball.prototype.draw = function() {
        circle(this.x, this.y, 10, true);
      };

      // Set the ball's direction based on a string
      Ball.prototype.setDirection = function(direction) {
        if (direction === "up") {
          this.xSpeed = 0;
          this.ySpeed = -5;
        } else if (direction === "down") {
          this.xSpeed = 0;
          this.ySpeed = 5;
        } else if (direction === "left") {
          this.xSpeed = -5;
          this.ySpeed = 0;
        } else if (direction === "right") {
          this.xSpeed = 5;
          this.ySpeed = 0;
        } else if (direction === "stop") {
          this.xSpeed = 0;
          this.ySpeed = 0;
        }
      };
      // Create the ball object
      var ball = new Ball();
      // An object to...