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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; var paddleHeight = 10; var paddleWidth = 75; var paddleX = (canvas.width - paddleWidth) / 2; var rightPressed = false; var leftPressed = false; var brickRowCount = 3; var brickColumnCount = 5; var brickWidth = 75; var brickHeight = 20; var brickPadding = 10; var brickOffsetTop = 30; var brickOffsetLeft = 30; var score = 0; var lives = 3; 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 }; } } document.addEventListener("keydown", keyDownHandler); document.addEventListener("keyup", keyUpHandler); function keyDownHandler(e) { if (e.keyCode === 39) { rightPressed = true; } else if (e.keyCode === 37) { leftPressed = true; } } function keyUpHandler(e) { if (e.keyCode === 39) { rightPressed = false; } else if (e.keyCode === 37) { leftPressed = false; } } 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 = "#0095DD"; ctx.fill(); ctx.closePath(); } } } } function drawBall() { ctx.beginPath(); ctx.arc(x, y, ballRadius, 0, Math.PI * 2); ctx.fillStyle = "#0095DD"; ctx.fill(); ctx.closePath(); // ball is drawn } function drawPaddle() { ctx.beginPath(); ctx.rect(paddleX, canvas.height - paddleHeight, paddleWidth, paddleHeight); ctx.fillStyle = "#0095DD"; ctx.fill(); ctx.closePath(); } 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; score++; if (score === brickRowCount * brickColumnCount) { alert("YOU WIN!"); document.location.reload(); } } } } } } function drawScore() { ctx.font = "16px Arial"; ctx.fillStyle = "0095DD"; ctx.fillText("Score: " + score, 8, 20); } function drawLives() { ctx.font = "16px Arial"; ctx.fillStyle = "0095DD"; ctx.fillText("Lives: " + lives, canvas.width - 65, 20); } function draw() { ctx.clearRect(0, 0, canvas.width, canvas.height); drawBricks(); drawBall(); drawPaddle(); drawScore(); drawLives(); collisionDetection(); if (y + dy < ballRadius) { //bouncing off top and bottom of canvas dy = -dy } else if (y + dy > canvas.height - ballRadius) { if (x > paddleX && x < paddleX + paddleWidth) { dy = -dy; } else { lives--; if (!lives) { alert("GAME OVER"); document.location.reload(); } 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 } if (rightPressed && paddleX < canvas.width - paddleWidth) { paddleX += 7; } else if (leftPressed && paddleX > 0) { paddleX -= 7; } x += dx; y += dy; requestAnimationFrame(draw); } document.addEventListener("mousemove", mouseMoveHandler); function mouseMoveHandler(e) { var relativeX = e.clientX - canvas.offsetLeft; if (relativeX > 0 + paddleWidth / 2 && relativeX < canvas.width - paddleWidth / 2) { paddleX = relativeX - paddleWidth / 2; } } draw();
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