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Javascript 游戏时钟小试

javascript游戏时钟 
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读了一篇<<如何实现游戏主循环(Game Loop)的详细解析>> 的文章, 用javascript实现一下,目前仍没有完全参透其中含义, 出来的效果不能另人满意 


<html>
	<head>
		<meta http-equiv=Content-Type content="text/html;charset=utf-8">
		<title>Javascript 游戏时钟小试</title>
		<script type="text/javascript" src="jquery-1.6.4.js"></script>
		<style type="text/css">
			body{font-size: 14px;}
			.wrap{border:solid 1px #f60; width:500px; height:300px; position:relative;}
			.item{border:solid 1px #660; line-height:30px; height:30px;}
			.red{color:red;}
			.block{width:10px;height:10px;background-color:#aaa;position:absolute;z-index:10000;line-height:0;font-size:0;}
			.ss{width:1px;height:14px;background-color:#eee;color:#ff0;line-height:0;font-size:10px;line-height: 14px;margin-top: 1px;}
			#debug{position:fixed; border:solid 1px #f60; width:600px;height:100%;right:0;top: 0;overflow: scroll;}
		</style>
	</head>
	<body>
		<a href="javascript:start()">start</a> |
		<a href="javascript:pause()">pause</a> |
		addBlock<a href="javascript:addBlock()">[1]</a><a href="javascript:addBlock2()">[10]</a>(<span id="blocks">0</span>) |
		Frame: <span id='Frame'>0</span> |
		SkipedFrame: <span id='skipFrame'>0</span> |
		<a href="javascript:big()">复杂计算</a> |
		<a href="javascript:$('#debug')">ClearDebug</a>
		<div class="wrap" id="msg">
			<div id="block-x" class="block" style="top:20px;left:0;background-color:#f60;"></div>
		</div>
		<div class="wrap">
			<div class='ss' id='s_0'></div>
			<div class='ss' id='s_1'></div>
			<div class='ss' id='s_2'></div>
			<div class='ss' id='s_3'></div>
			<div class='ss' id='s_4'></div>
			<div class='ss' id='s_5'></div>
			<div class='ss' id='s_6'></div>
			<div class='ss' id='s_7'></div>
			<div class='ss' id='s_8'></div>
			<div class='ss' id='s_9'></div>
			<div class='ss' id='s_10'></div>
			<div class='ss' id='s_11'></div>
			<div class='ss' id='s_12'></div>
			<div class='ss' id='s_13'></div>
			<div class='ss' id='s_14'></div>
			<div class='ss' id='s_15'></div>
			<div class='ss' id='s_16'></div>
			<div class='ss' id='s_17'></div>
			<div class='ss' id='s_18'></div>
			<div class='ss' id='s_19'></div>
		</div>
		<div id="debug"></div>

		<script type="text/javascript">
			//模拟复杂计算
			function big(){
				//b = (new Date()).getTime();
				var i=0;
				while(i++ <500000){
					(new Date()).getTime();
				}
				//alert((new Date()).getTime() - b);
			}
	
			function GetTickCount(){return (new Date()).getTime();}
	
			var fps = 25;
			var SKIP_TICKS = 1000 / fps;
			var MAX_FRAMESKIP = 5;
			var next_game_tick = GetTickCount();
			var game_is_running = false;
			var interpolation = 0, loop = 0;
			var nowFrame = 0;
			var skipFrame = 0;
			var speed = 50;// px/s
			var timer;
			var time_interval = 10;
			var x = 0;
			var $bbbox=$('#block-x');
	
			function start(){
				if(game_is_running === true) return;
				game_is_running = true;
				next_game_tick = GetTickCount();
				timer = setInterval(function(){
					loops = 0;
					while( GetTickCount() > next_game_tick && loops < MAX_FRAMESKIP) {
						update_game();
						next_game_tick += SKIP_TICKS;
						loops++;
						skipFrame += loops > 1 ? 1 : 0;
						//debug(x)
						//$bbbox.width(x + 10);
					}
					
					interpolation = ( GetTickCount() + SKIP_TICKS  - next_game_tick ) / SKIP_TICKS;
					display_game( interpolation );
			
				},time_interval);
			}
	
			function pause(){
				clearInterval(timer);
				game_is_running = false;
			}
	
			function update_game(){
				nowFrame++;
				var i,l;
				for(i=0,l=arr1.length;i<l;i++){
					next(arr2[i]);
				}
			}

			function debug(){
				var x='';
				for(var j=0,len=arguments.length;j<len;j++){
					x+=' | ' + arguments[j];
				}
				$('#debug').prepend(x + '<br >')
				x = null;
			}

			var arr_c = [];
			function c(interpolation){
				arr_c.push(interpolation);
				while(arr_c.length>20) arr_c = arr_c.slice(1);
				var i;
				for(i=0,len=arr_c.length;i<len;i++){
					$('#s_'+i).css({width : arr_c[i] * 100 + 50});//.html(arr_c[i])
				}
			}

			//0,1,2,3,4,5
			function next(arr){
				arr[0] += arr[2] * arr[4] * SKIP_TICKS ;
				if(arr[0]<0){
					arr[0] = 0;
					arr[2] *= -1;
				}else if(arr[0]>=490){
					arr[0] = 490;
					arr[2] *= -1;
				}
				
				arr[1] += arr[3] * arr[5] * SKIP_TICKS;
				if(arr[1]<0){
					arr[1] = 0;
					arr[3] *= -1;
				}else if(arr[1]>290){
					arr[1] = 290;
					arr[3] *= -1;
				}
			}
	
			var arr1 = [];
			var arr2 = [];//[x,y,1,1,speed_x,speed_y]
			function display_game(interpolation){
				$('#Frame').html(nowFrame);
				$('#skipFrame').html(skipFrame);
				var i,l;
				for(i=0,l=arr1.length;i<l;i++){
					//debug(arr2[i][0], arr2[i][1]* interpolation)
					$(arr1[i]).css({left : arr2[i][0] , top : arr2[i][1]});
				}

				c(interpolation);
				
				//模拟很卡
				//if(Math.random()>0.99) big();
			}

			
			function addBlock(){
				var block = $('<div class="block" id="b'+ arr1.length +'"></div>');
				$('#msg').append(block);
				var a = Math.random() * speed / 1.1 + 2;
				var b = Math.sqrt(speed * speed - a * a);
				arr2.push([0,0,1,1,a/1000,b/1000]);
				arr1.push(block);
				block = null;
				$('#blocks').html(arr1.length);
			}

			function addBlock2(){
				var _i=0;
				while(_i++ <10) addBlock();
			}
	

		</script>


	</body>
</html>
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