window.onload=initialise; function initialise() { document.getElementById("restartButton").onclick = restart; var canvas = document.getElementById("myCanvas"); var ctx = canvas.getContext("2d"); var x = canvas.width / 2; var y = canvas.height - 30; var dx = 2; var dy = -2; var ballRadius = 10; //paddle var paddleHeight = 10; var paddleWidth = 75; var paddleX = (canvas.width - paddleWidth) / 2; var cr = "#178484"; var rightPressed = false; var leftPressed = false; var drawInterval = setInterval(draw, 10); var gameEnd = false; var score = 0; var lives = 3; //bricks var brickRowCount = 3; var brickColumnCount = 5; var brickWidth = 75; var brickHeight = 20; var brickPadding = 10; var brickOffsetTop = 30; var brickOffsetLeft = 30; var bricks = []; for (c = 0; c < brickColumnCount; c++) { bricks[c] = []; for (r = 0; r < brickRowCount; r++) { bricks[c][r] = { x: 0, y: 0, status: 1 }; } } function drawLives() { ctx.font = "16px Arial"; ctx.fillStyle = "#178484"; ctx.fillText("Lives: " + lives, canvas.width - 65, 20); } function drawScore() { ctx.beginPath(); ctx.textAlign = "center"; ctx.font = "16px Verdana"; ctx.fillStyle = "#178484"; ctx.fillText("Score: " + score, canvas.width / 2, 20); ctx.closePath(); } function drawBricks() { for (c = 0; c < brickColumnCount; c++) { for (r = 0; r < brickRowCount; r++) { if (bricks[c][r].status == 1) { var brickX = (c * (brickWidth + brickPadding)) + brickOffsetLeft; var brickY = (r * (brickHeight + brickPadding)) + brickOffsetTop; bricks[c][r].x = brickX; bricks[c][r].y = brickY; ctx.beginPath(); ctx.rect(brickX, brickY, brickWidth, brickHeight); ctx.fillStyle = "#178484"; ctx.fill(); ctx.closePath(); } } } } function drawBall() { ctx.beginPath(); ctx.arc(x, y, ballRadius, 0, Math.PI * 2); ctx.fillStyle = cr; ctx.fill(); ctx.closePath(); } function drawPaddle() { ctx.beginPath(); ctx.rect(paddleX, canvas.height - paddleHeight, paddleWidth, paddleHeight); ctx.fillStyle = "#178484"; ctx.fill(); ctx.closePath(); } function randomColor() { cr = ctx.fillStyle = 'rgb(' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() * 256)) + ')'; } function draw() { //movement ctx.clearRect(0, 0, canvas.width, canvas.height); drawBall(); drawPaddle(); drawBricks(); collisionDetection(); drawScore(); drawLives(); if (y + dy < ballRadius) { dy = -dy; //bounce top + bottom } else if (y + dy > canvas.height - ballRadius) { if (x > paddleX && x < paddleX + paddleWidth) { dy = -dy; } else { lives--; if (!lives) { gameOver(); } else { x = canvas.width / 2; y = canvas.height - 30; dx = 2; dy = -2; paddleX = (canvas.width - paddleWidth) / 2; } } } if (x + dx > canvas.width - ballRadius || x + dx < ballRadius) { dx = -dx; //bounce sides } x += dx; y += dy; if (rightPressed && paddleX < canvas.width - paddleWidth) { paddleX += 5; } else if (leftPressed && paddleX > 0) { paddleX -= 5; } } //draw end document.addEventListener("mousemove", mouseMoveHandler, false); document.addEventListener("keydown", keyDownHandler, false); document.addEventListener("keyup", keyUpHandler, false); function mouseMoveHandler(e) { var paddleCenter = paddleWidth / 2; var relativeX = e.clientX - canvas.offsetLeft; if (relativeX > 0 + (paddleCenter - 2) && relativeX < canvas.width - (paddleCenter - 2)) { paddleX = relativeX - paddleCenter; } } function keyDownHandler(e) { if (e.keyCode == 39 || e.keyCode == 68) { rightPressed = true; } else if (e.keyCode == 37 || e.keyCode == 65) { leftPressed = true; } } function keyUpHandler(e) { if (e.keyCode == 39 || e.keyCode == 68) { rightPressed = false; } else if (e.keyCode == 37 || e.keyCode == 65) { leftPressed = false; } } function collisionDetection() { for (c = 0; c < brickColumnCount; c++) { for (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; randomColor(); score++; scoreDetection(); } } } } } function scoreDetection() { if (score == 100) { winScreen(); } else if (score % (brickRowCount * brickColumnCount) == 0) { resetBricks(); } } function gameOver() { ctx.beginPath(); ctx.fillStyle = "#161616"; ctx.fillRect(0, 0, canvas.width, canvas.height); ctx.font = "50px Verdana"; ctx.fillStyle = "#ffffff"; ctx.textAlign = "center"; ctx.fillText("GAME OVER", canvas.width / 2, canvas.height / 2); ctx.closePath(); clearInterval(drawInterval); gameEnd = true; return; } function winScreen() { ctx.beginPath(); ctx.fillStyle = "#161616"; ctx.fillRect(0, 0, canvas.width, canvas.height); ctx.font = "50px Verdana"; ctx.fillStyle = "#ffffff"; ctx.textAlign = "center"; ctx.fillText("You Win!", canvas.width / 2, canvas.height / 2); ctx.closePath(); clearInterval(drawInterval); gameEnd = true; return; } function restart() { if (gameEnd === true) { ctx.clearRect(0, 0, canvas.width, canvas.height); x = canvas.width / 2; y = canvas.height - 30; dx = 2; dy = -2; score = 0; lives = 3; resetBricks(); drawInterval = setInterval(draw, 10); gameEnd = false; } } function resetBricks() { for (c = 0; c < brickColumnCount; c++) { for (r = 0; r < brickRowCount; r++) { var b = bricks[c][r]; b.status = 1; } } } }

Breakout - Game