자바스크립트를 이용한 벽돌깨기이다.
[출처 - https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_Breakout_game_pure_JavaScript]
[사진 1: 벽돌깨기]
// js
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var score = 0;
var x = canvas.width / 2;
var y = canvas.height - 30;
var dx = 2;
var dy = -2;
var brickRowCount = 3;
var brickColumnCount = 5;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var ballRadius = 10;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width - paddleWidth) / 2;
var rightPressed = false;
var leftPressed = false;
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
var bricks = [];
for (i = 0; i < brickColumnCount; ++i) {
bricks[i] = [];
for (q = 0; q < brickRowCount; ++q) {
bricks[i][q] = {
x: 0,
y: 0,
status: 1
};
}
}
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI * 2);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
function drawPaddle() {
ctx.beginPath();
ctx.rect(paddleX, canvas.height - paddleHeight, paddleWidth, paddleHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
function drawBricks() {
for (i = 0; i < brickColumnCount; ++i) {
for (q = 0; q < brickRowCount; ++q) {
if (bricks[i][q].status == 1) {
var brickX = (i * (brickWidth + brickPadding)) + brickOffsetLeft;
var brickY = (q * (brickHeight + brickPadding)) + brickOffsetTop;
bricks[i][q].x = brickX;
bricks[i][q].y = brickY;
ctx.beginPath();
ctx.rect(brickX, brickY, brickWidth, brickHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
}
}
}
function drawScore() {
ctx.font = "16px Arial";
ctx.fillStyle = "#0095DD";
ctx.fillText("Score: "+score, 8, 20);
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBricks();
drawBall();
drawPaddle();
drawScore();
collisionDetection();
if (x + dx > canvas.width - ballRadius || x + dx < ballRadius) {
dx = -dx;
changeBallColor("#FF00DD");
}
if (y + dy < ballRadius) {
dy = -dy;
changeBallColor("#3F0099");
} else if (y + dy > canvas.height - ballRadius) {
if (x > paddleX && x < paddleX + paddleWidth) {
dy = -dy;
} else {
alert("Game Over");
document.location.reload();
}
}
if (rightPressed && paddleX < canvas.width - paddleWidth) {
paddleX += 7;
} else if (leftPressed && paddleX > 0) {
paddleX -= 7;
}
x += dx;
y += dy;
}
function changeBallColor(code) {
ctx.fillStyle = code;
ctx.fill();
}
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 (i = 0; i < brickColumnCount; ++i) {
for (q = 0; q < brickRowCount; ++q) {
var b = bricks[i][q];
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();
}
}
}
}
}
}
setInterval(draw, 10);
<html>
<head>
<meta charset="utf-8" />
<title>벽돌깨기</title>
<link rel="stylesheet" href="canvas.css" type="text/css" media="screen" />
</head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script type="text/javascript" src="canvas_js.js"></script>
</body>
</html>
canvas {
background: #eee;
}
2D rendering context 를 이용해 구현을 하는데 여기서 beginPath() 와 closePath() 메소드 안에 명령어가 들어가야 한다고 한다.
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