HTML5 游戏开发-骰子游戏

HTML5 游戏开发---骰子游戏
<html>
	<head>
    	<title>骰子游戏</title>
        <meta charset="utf-8"/>
		<script type="text/javascript">
			// 画布大小
			var canvasWidth = 400;
			var canvasHeight = 300;
			
			// 骰子大小
			var diceWidth = 100;
			var diceHeight = 100;
			
			// 骰子位置
			var diceX = 50;
			var diceY = 50;
			
			// 偏移量，用于绘制不同位置的骰子
			var dx;
			var dy;
			
			// 点半径
			var dotRadius = 6;
			
			var ctx;
			
			var point;
			var isFirstThrownFlag = true;
			
			function btnThrowClickHandler()
			{
				var sum = 0; // 记录每一次的两个骰子的和
				ctx = document.getElementById("canvas").getContext("2d");
				
				// 第一个骰子绘制开始
				var randomNum = Math.floor((Math.random() * 6)) + 1;
				sum += randomNum;
				dx = diceX;
				dy = diceY;
				draw(randomNum);	
				
				randomNum = Math.floor((Math.random() * 6)) + 1;
				sum += randomNum;
				dx = diceX + 150;
				draw(randomNum);
				
				if(isFirstThrownFlag)
				{
					switch(sum)
					{
						case 7:
						case 11:
							document.getElementById("txtOutCome").value = "You Win!";
							break;
						case 2 :
						case 3 :
						case 12:
							document.getElementById("txtOutCome").value = "You lose!!";	
							break;
						default:
							point = sum;
							isFirstThrownFlag = false;
							document.getElementById("txtScore").value = point;
							document.getElementById("txtStage").value = "Need folloy up throw!!";
							document.getElementById("txtOutCome").value = "";
							break;
					}
				}
				else
				{
					switch(sum)
					{
						case point:
							document.getElementById("txtOutCome").value = "You Win!!";
							document.getElementById("txtStage").value = "Back to first throw!!";
							isFirstThrownFlag = true;
							document.getElementById("txtScore").value = "";
							break;	
						case 7:
							document.getElementById("txtOutCome").value = "You lose!!";
							document.getElementById("txtStage").value = "Back to first throw!!";
							isFirstThrownFlag = true;
							document.getElementById("txtScore").value = "";
							break;
					}
				}
			}
			
			function draw(num)
			{
				// 绘制骰子的矩形外框
				ctx.lineWidth = 5;
				ctx.clearRect(dx,dy,diceWidth,diceHeight);
				ctx.strokeRect(dx,dy,diceWidth,diceHeight);
				
				// 设置圆点的颜色
				ctx.fillStyle = "#009966";

				switch(num)
				{
					case 1:
						draw1();
						break;
					case 2:
						draw2();
						break;
					case 3:
						draw1();
						draw2();
						break;
					case 4:
						draw4();
						break;
					case 5:
						draw1();
						draw4();
						break;
					case 6:
						draw2mid();
						draw4();
						break;
					default:
						break;	
				}
			}
			
			
			function draw1()
			{
				// 绘制一个点，放到正中间
				var dotX = dx + diceWidth * 0.5;
				var dotY = dy + diceHeight * 0.5;
				ctx.beginPath();
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				ctx.closePath();
				ctx.fill();		
			}
			
			function draw2()
			{
				// 绘制两个点，一个左上角，一个右下角
				
				// 左上点的角圆心
				var dotX = dx + 3 * dotRadius;
				var dotY = dy + 3 * dotRadius;
				
				ctx.beginPath();
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				
				// 右下角点的圆心
				dotX = dx + diceWidth - 3 * dotRadius;
				dotY = dy + diceHeight - 3 * dotRadius;
				
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				ctx.closePath();
				ctx.fill();
			}
			
			function draw4()
			{
				// 先绘制左上角和右下角
				draw2();
				
				// 绘制右上角
				var dotX = dx + diceWidth - 3 * dotRadius;
				var dotY = dy + 3 * dotRadius;
				
				ctx.beginPath();
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				
				dotX = dx + 3 * dotRadius;
				dotY = dy + diceHeight - 3 * dotRadius;
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				ctx.closePath();
				ctx.fill();
			}
			
			function draw2mid()
			{
				// 第二行中间绘制两个点
				var dotX = dx + 3 * dotRadius;
				var dotY = dy + 0.5 * diceHeight;
				ctx.beginPath();
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				
				dotX = dx + diceWidth - 3 * dotRadius;
				ctx.arc(dotX,dotY, dotRadius,0,2 * Math.PI,true);
				ctx.closePath();
				ctx.fill();	
			}
			
			
		</script>
    </head>
    <body >
    	<canvas id="canvas" width="400" height="300">
        	Sorry,your browser doesn't support Canvas!!!
        </canvas>
        
        <input type="button" value="Throw" onClick="btnThrowClickHandler()"/><br/>
        <table>
        	<tr>
            	<td>Stage:<input type="text" id="txtStage"/></td>
                <td>Score:<input type="text" id="txtScore"/></td>
                <td>OutCome:<input type="text" id="txtOutCome"/></td>
            </tr>
        </table>
    </body>
</html>
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