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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>First 2D Web Browser Game</title>
<link href="https://fonts.googleapis.com/css?family=Dhurjati" rel="stylesheet">
<style>
* {
padding: 0;
margin: 0;
} canvas {
background: #eee;
display: block;
margin: 0 auto;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
//Initialize variables for paddle:
var paddleHeight = 10,
paddleWidth = 75,
paddleX = (canvas.width - paddleWidth)/2;
//Initialize variables for ball:
var x = canvas.width/2;
var y = canvas.height-30;
var ballRadius = 10;
var dx = 2;
var dy = -2;
var ballColor = "#ff0000";
//Initialize variables for keys checking:
var rightPressed = false;
var leftPressed = false;
//Initialize and declare all variables for bricks:
var brickRowCount = 3;
var brickColumnCount = 5;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
//Variable for counting score:
var score = 0;
//Variable for countring available lives:
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, false);
document.addEventListener("keyup", keyUpHandler, false);
document.addEventListener("mousemove", mouseMoveHandler, false);
function mouseMoveHandler(e) {
var relativeX = e.clientX - canvas.offsetLeft;
if(relativeX > (paddleWidth / 2) && relativeX < canvas.width - (paddleWidth / 2)) {
paddleX = relativeX - paddleWidth / 2;
}
}
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 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, CONGRATULATIONS");
document.location.reload();
}
}
}
}
}
}
function drawScore() {
ctx.font = "16px Arial";
ctx.fillStyle = "#cc0000";
ctx.fillText("Score: " + score, 8, 20);
}
function drawLives() {
ctx.font = "16px Arial";
ctx.fillStyle = "#cc0000";
ctx.fillText("Lives: " + lives, canvas.width - 65, 20);
}
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI*2);
ctx.fillStyle = ballColor;
ctx.fill();
ctx.closePath();
}
function drawPaddle() {
ctx.beginPath();
ctx.rect(paddleX, canvas.height - paddleHeight, paddleWidth, paddleHeight);
ctx.fillStyle = "#ff0000";
ctx.fill();
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 = "#ff0000";
ctx.fill();
ctx.closePath();
}
}
}
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBricks();
drawBall();
drawPaddle();
drawScore();
drawLives();
collisionDetection();
//Insert code for simple collision detection:
if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
dx = -dx;
ballColor = randomColor();
}
//Implementing game over:
if(y + dy < ballRadius) {
dy = -dy;
ballColor = randomColor();
} else if(y + dy > canvas.height - ballRadius) {
if(x > paddleX && x < paddleX + paddleWidth) {
dy = -dy;
dx += 0.5;
dy -= 0.5;
} 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(rightPressed && paddleX < canvas.width - paddleWidth) {
paddleX += 7;
} else if(leftPressed && paddleX > 0) {
paddleX -= 7;
}
x += dx;
y += dy;
requestAnimationFrame(draw);
}
function randomColor() {
var rgb = [];
var i;
for(i=0; i < 3; i++) {
rgb.push(Math.floor(Math.random() * 250 + 0));
}
return 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
}
draw();
</script>
</body>
</html>