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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Game</title>
<style type="text/css">
#mycanvas{
border: solid 5px red;
background-color: gray;
}
</style>
</head>
<body>
<canvas id="mycanvas" width="700px" height="500px"></canvas>
<script type="text/javascript">
var canvas=document.getElementById('mycanvas');
var ctx=canvas.getContext("2d");
var x=canvas.width/2;
var y=canvas.height-30;
var ballR=10;
var dx=2;
var dy=-2;
var paddleheight=10;
var paddlewidth=75;
var paddlexPos=(canvas.width-paddlewidth)/2;
var move=7;
var rightkey;
var leftkey;
var brickRows = 3;
var brickCol = 9;
var brickW = 60;
var brickH = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var bricks = [];
for (c = 0; c < brickCol; c++) {
bricks[c] = [];
for (r = 0; r < brickRows; r++) {
bricks[c][r] = {
x: 0,
y: 0,
status: 1
};
}
}
function drawBricks() {
for (c = 0; c < brickCol; c++) {
for (r = 0; r < brickRows; r++) {
if (bricks[c][r].status == 1) {
var brickX = (c * (brickW + brickPadding)) + brickOffsetLeft;
var brickY = (r * (brickH + brickPadding));
bricks[c][r].x = brickX;
bricks[c][r].y = brickY;
ctx.beginPath();
ctx.rect(brickX, brickY, brickW, brickH);
ctx.fillStyle = "green";
ctx.fill();
ctx.closePath();
}
}
}
}
function drawPaddle() {
ctx.beginPath();
ctx.rect(paddlexPos,(canvas.height - paddleheight),paddlewidth ,paddleheight);
ctx.fillStyle='red';
ctx.fill();
ctx.stroke();
ctx.closePath();
}
function collisionDetection() {
for (c = 0; c < brickCol; c++) {
for (r = 0; r < brickRows; r++) {
var b = bricks[c][r];
if (b.status == 1) {
if (x > b.x && x < b.x + brickW && y > b.y && y < b.y + brickH) {
dy = -dy;
b.status = 0;
}
}
}
}
}
function drawBall() {
ctx.beginPath();
ctx.arc(x,y,ballR,0,2*Math.PI);
ctx.fillStyle='red';
ctx.fill();
ctx.stroke();
ctx.closePath();
}
window.addEventListener('keydown',(e)=>{
if (e.keyCode==39) {
rightkey=true;
}
else if (e.keyCode==37) {
leftkey=true;
}
});
window.addEventListener('keyup',(e)=>{
if (e.keyCode==39) {
rightkey=false;
}
else if (e.keyCode==37) {
leftkey=false;
}
});
function draw() {
ctx.clearRect(0,0,canvas.width,canvas.height);
drawBricks();
drawBall();
drawPaddle();
if (x+dx>canvas.width-ballR || x+dx<ballR) {
dx=-dx;
}
if (y+dy<ballR || (y+dy>canvas.height-paddleheight-ballR && x+dx>paddlexPos && x+dx<paddlexPos+paddlewidth)) {
dy=-dy;
}
else if (y+dy>canvas.height) {
location.reload();
}
if (rightkey&&(paddlexPos+paddlewidth<canvas.width)) {
paddlexPos+=move;
}
else if (leftkey&&paddlexPos>0) {
paddlexPos-=move;
}
x=x+dx;
y=y+dy;
collisionDetection();
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
</script>
</body>
</html>