212 lines
5.0 KiB
HTML
212 lines
5.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>MDN Breakout</title>
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<style>
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* { padding: 0; margin: 0; }
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canvas { background: #eee; display: block; margin: 0 auto; }
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</style>
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</head>
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<body>
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<canvas id="myCanvas" width="480" height="320"></canvas>
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<script>
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(function() {
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var canvas = document.getElementById("myCanvas");
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var ctx = canvas.getContext("2d");
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var ballRadius = 10;
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var ballColor = '#0095DD';
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var paddleHeight = 7;
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var paddleWidth = 119;
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var paddleX = (canvas.width-paddleWidth)/2;
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var paddleSpeed = 7;
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var rightPressed = false;
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var leftPressed = false;
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var x = canvas.width/2;
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var y = canvas.height-randInt(10, 50);
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var dx = 2;
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var dy = -2;
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var score = 0;
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var scoreStep = 1;
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var isPaused = false;
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var brickRowCount = 3;
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var brickColumnCount = 5;
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var brickWidth = 75;
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var brickHeight = 20;
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var brickPadding = 10;
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var brickOffsetTop = 30;
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var brickOffsetLeft = 30;
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var bricks = [];
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for(c=0; c<brickColumnCount; c++) {
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bricks[c] = [];
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for(r=0; r<brickRowCount; r++) {
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bricks[c][r] = { x: 0, y: 0, status: 1 };
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}
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}
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function randInt(min, max) {
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min = Math.ceil(min);
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max = Math.floor(max);
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return Math.floor(Math.random() * (max - min)) + min;
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}
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function randColor() {
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return 'rgba(' + ([
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randInt(0, 255),
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randInt(0, 255),
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randInt(0, 255)
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].map(function(elem, i) { return '' + elem; }).join(',')) + ', 1.0)'
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}
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function drawBall() {
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ctx.beginPath();
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ctx.arc(x, y, ballRadius, 0, Math.PI*2);
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ctx.fillStyle = ballColor;
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ctx.fill();
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ctx.closePath();
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}
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function drawPaddle() {
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ctx.beginPath();
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ctx.rect(paddleX, canvas.height-paddleHeight, paddleWidth, paddleHeight);
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ctx.fillStyle = "#0095DD";
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ctx.fill();
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ctx.closePath();
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}
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function drawBricks() {
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for(c=0; c<brickColumnCount; c++) {
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for(r=0; r<brickRowCount; r++) {
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if(bricks[c][r].status != 1) {
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continue;
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}
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var brickX = (c*(brickWidth+brickPadding))+brickOffsetLeft;
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var brickY = (r*(brickHeight+brickPadding))+brickOffsetTop;
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bricks[c][r].x = brickX;
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bricks[c][r].y = brickY;
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ctx.beginPath();
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ctx.rect(brickX, brickY, brickWidth, brickHeight);
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ctx.fillStyle = "#0095DD";
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ctx.fill();
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ctx.closePath();
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}
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}
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}
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function collisionDetection() {
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for(c=0; c<brickColumnCount; c++) {
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for(r=0; r<brickRowCount; r++) {
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var b = bricks[c][r];
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if(b.status != 1) {
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continue;
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}
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if(x > b.x && x < b.x+brickWidth && y > b.y && y < b.y+brickHeight) {
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dy = -dy;
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b.status = 0;
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score += scoreStep;
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// scoreStep++;
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if(score >= (brickRowCount*brickColumnCount*scoreStep)) {
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pauseWithMessage("YOU WIN! FINAL SCORE "+score+"!");
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// document.location.reload();
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}
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}
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}
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}
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}
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function drawScore() {
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ctx.font = "16px Arial";
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ctx.fillStyle = "#0095DD";
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ctx.fillText("Score: "+score, 8, 20);
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}
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function draw() {
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if(isPaused) {
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return;
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}
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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drawBricks();
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drawBall();
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drawPaddle();
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drawScore();
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collisionDetection();
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if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
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dx = -dx;
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ballColor = randColor();
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}
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if(y + dy < ballRadius) {
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dy = -dy;
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ballColor = randColor();
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}
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else if(y + dy > canvas.height-ballRadius) {
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if(x > paddleX && x < paddleX + paddleWidth) {
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dy = -dy;
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dx *= 1.01;
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dy *= 1.01;
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}
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else {
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pauseWithMessage("GAME OVER");
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// document.location.reload();
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}
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}
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if(rightPressed && paddleX < canvas.width-paddleWidth) {
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paddleX += paddleSpeed;
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}
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else if(leftPressed && paddleX > 0) {
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paddleX -= paddleSpeed;
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}
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x += dx;
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y += dy;
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}
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function pauseWithMessage(msg) {
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isPaused = true;
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ctx.font = "16px Arial";
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ctx.fillStyle = "#FF3333";
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ctx.fillText(msg, 150, 200);
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}
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function keyDownHandler(e) {
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if(e.keyCode == 39) {
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rightPressed = true;
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}
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else if(e.keyCode == 37) {
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leftPressed = true;
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}
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}
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function keyUpHandler(e) {
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if(e.keyCode == 39) {
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rightPressed = false;
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}
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else if(e.keyCode == 37) {
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leftPressed = false;
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}
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else if(e.keyCode == 27) {
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if(isPaused) {
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isPaused = false;
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} else {
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pauseWithMessage("PAUSE (ESC)");
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}
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}
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}
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function mouseMoveHandler(e) {
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var relativeX = e.clientX - canvas.offsetLeft;
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if(relativeX > (0-paddleWidth) && relativeX < (canvas.width+paddleWidth)) {
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paddleX = relativeX - paddleWidth/2;
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}
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}
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document.addEventListener("keydown", keyDownHandler, false);
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document.addEventListener("keyup", keyUpHandler, false);
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document.addEventListener("mousemove", mouseMoveHandler, false);
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setInterval(draw, 10);
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})();
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</script>
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</body>
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</html>
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