JSFiddle - React, Tailwind, and code Playground

by raymondjplante

HTML

<canvas id="myCanvas" height="320" width="480"></canvas>

CSS

canvas { background: #eee; }

JavaScript

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 2;
var dy = -2;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width-paddleWidth)/2;
var rightPressed = false;
var leftPressed = false;
var brickRowCount = 5;
var brickColumnCount = 3;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var interval;

var bricks = [];
for(var c=0; c<brickColumnCount; c++) {
  bricks[c] = [];
  for(var r=0; r<brickRowCount; r++) {
    bricks[c][r] = { x: 0, y: 0, status: 1 };
  }
}

document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);

function keyDownHandler(e) {
    if(e.key == "Right" || e.key == "ArrowRight") {
        rightPressed = true;
    }
    else if(e.key == "Left" || e.key == "ArrowLeft") {
        leftPressed = true;
    }
}

function keyUpHandler(e) {
    if(e.key == "Right" || e.key == "ArrowRight") {
        rightPressed = false;
    }
    else if(e.key == "Left" || e.key == "ArrowLeft") {
        leftPressed = false;
    }
}

function collisionDetection() {
  for(var c=0; c<brickColumnCount; c++) {
    for(var r=0; r<brickRowCount; r++) {
      var b = bricks[c][r];
      if(b.status == 1) {
        if(x > b.x && x < b.x+brickWidth && y > b.y && y < b.y+brickHeight) {
          dy = -dy;
          b.status = 0;
        }
      }
    }
  }
}

function drawBall() {
  ctx.beginPath();
  ctx.arc(x, y, ballRadius, 0, Math.PI*2);
  ctx.fillStyle = "#0095DD";
  ctx.fill();
  ctx.closePath();
}

function drawPaddle() {
  ctx.beginPath();
  ctx.rect(paddleX, canvas.height-paddleHeight, paddleWidth, paddleHeight);
  ctx.fillStyle = "#0095DD";
  ctx.fill();
  ctx.closePath();
}

function drawBricks() {
  for(var c=0; c<brickColumnCount; c++) {
    for(var r=0; r<brickRowCount; r++) {
      if(bricks[c][r].status ==...