Latest revision as of 05:51, 29 June 2012

앵그리버드 만들기

HTML5 canvas를 이용해 앵그리버드를 만들어봅시다.
링크

<!DOCTYPE HTML>
<html>
<head>
<title>devils Bird</title>
<script>
//input your javascript code!
//tags do not work;
</script>
</head>
<body>

<h1>Devils World!</h1>
<!-- input your tags! -->
<canvas id="devilsBird" width="600" height="400" style="background:#acbefb">
</canvas>
<script>
var a = {x: 0, y: 2};
var v = {x: 20, y: -30};
var bird = {x: 20, y: 300};
var ima = new Image();
ima.src = "image.png";
var t = 0;
function Loop()
{
	clearCanvas();
	drawBird();
	move(1);
	t++;
	if(t > 40)
	{
		clearInterval(intervalId);
	}
}
function clearCanvas()
{
	context.clearRect(0, 0, 600, 400);
}
function drawBird()
{
	context.drawImage(ima,bird.x,bird.y,50,50);
	//context.fillRect(bird.x, bird.y, 50, 50);
}
function move(t)
{
	v.x += a.x * t;
	v.y += a.y * t;
	
	bird.x += v.x * t;
	bird.y += v.y * t;
}


var devilsBird = document.getElementById("devilsBird");
var context = devilsBird.getContext("2d");

var x = 0;
var intervalId = setInterval(Loop, 30);

</script>
</body>
</html>

의존성과 전역변수를 줄인 버전

<!DOCTYPE HTML>
<html>
<head>
<script>
var start = {x : 100, y : 300};

function Bird()
{
	this.x = start.x;
	this.y = start.y;
	this.vx = 0;
	this.vy = 0;
	this.img = new Image();
	this.img.src = "bird.png";
	this.isShoot = false;
}
Bird.prototype.shoot = function(dx, dy)
{
	this.vx = dx / 100;
	this.vy = dy / 100;
	this.isShoot = true;
}
Bird.prototype.move = function(deltaTime)
{
	this.x += this.vx * deltaTime;
	this.y += this.vy * deltaTime;
	if(this.isShoot)
		this.vy += deltaTime/1000;
}
Bird.prototype.cheekStop = function()
{
	if(this.y > 400)
		return true;
}

function Game()
{
	var elem = document.getElementById("devilsBird");
	this.context = elem.getContext("2d");
	
	this.currentBird = new Bird();

	var that = this;
	var onDrag = false;
	elem.addEventListener("mousedown", function(e){
		var pos = getXY(e);
		if(pos.x > start.x - 13 && pos.x < start.x + 13 && pos.y > start.y - 13 && pos.y < start.y + 13)
		{
			onDrag = true;
		}
	});
	elem.addEventListener("mouseup", function(e){
		if(onDrag)
		{
			that.onMouseUp(e);
			onDrag = false;
		}
	});
}
Game.prototype.onMouseUp = function(e)
{
	var pos = getXY(e);
	var dx = start.x - pos.x;
	var dy = start.y - pos.y;

	this.currentBird.shoot(dx, dy);
}
Game.prototype.run = function()
{
	var currentTime = new Date();

	var context = this.context;

	setTimeoutOnContext(this, function(){
		var oldTime = currentTime;
		currentTime = new Date();
		var deltaTime = currentTime - oldTime;
		
		this.drawScreen();

		this.move(deltaTime);

		this.chk();

		setTimeoutOnContext(this, arguments.callee,0);
		
	}, 0);

}
Game.prototype.drawScreen = function()
{
	this.context.clearRect(0,0,600,400);
	this.context.drawImage(this.currentBird.img, this.currentBird.x-13, this.currentBird.y-13, 25, 25);
}
Game.prototype.move = function(deltaTime)
{
	this.currentBird.move(deltaTime);
}
Game.prototype.chk = function()
{
	if(this.currentBird.cheekStop())
			this.currentBird = new Bird();
}

function setTimeoutOnContext(context, func, time)
{
	setTimeout(function(){
		func.apply(context);
	}, time);
}
function getXY(e)
{
	return {x:e.clientX + pageXOffset - e.target.offsetLeft, y:e.clientY + pageYOffset - e.target.offsetTop};
}
</script>
</head>
<body>
<h1>Devils World!</h1>
<canvas id="devilsBird" width="600" height="400" style="background:#acbefb"></canvas>
</body>
<script>
new Game().run();
</script>
</html>

데블스캠프2012