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HTML5 風車特效，請使用火狐瀏覽

2024-09-05 12:18:44

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供稿：網友

HTML5 寫的風車動畫特效，請使用火狐瀏覽，IE9及以上瀏覽器可以看到效果，IE9以下無效果，甚至出錯。

<!DOCTYPE html><html><head><meta charset="utf-8" /><title>那年我們一起看過的大風車</title><style type="text/css">#box{ 	border:2px solid #f60; width:800px; height:600px; margin:0 auto;}</style><script type="text/javascript">	var canvas,context;//畫布、上下文	var X,Y;//風車的圓心X坐標、Y坐標	var canvasWidth,canvasHeight;//畫布的寬高	var speed = 1;//風車的轉速、默認為1	var R = 10;//風車的半徑	/***		author:qingfeilee		date:2012-03-21		description:初始化頁面函數	*/	function init(){		initCanvas();		initParams();		draw();		setInterval(draw,20);	}	/***		author:qingfeilee		date:2012-03-21		description:初始化畫布寬高、風車圓心坐標	*/	function initParams(){		canvasWidth = canvas.width;		canvasHeight = canvas.height;		X = canvasWidth/2;		Y = canvasHeight/4;	}	/***		author:qingfeilee		date:2012-03-21		description:設置風的大小	*/	function setSpeed(speed){		this.speed = speed;	}	/***		author:qingfeilee		date:2012-03-21		description:設置風的大小	*/	function setR(R){		this.R = R;	}	/***		author:qingfeilee		date:2012-03-21		description:初始化畫布	*/	function initCanvas(){		try{		canvas = document.getElementById("windmill");		context = canvas.getContext("2d");		}catch(e){			document.getElementById("tip_info").innerHTML = "您的瀏覽器不支持！";		}	}	/***		author:qingfeilee		date:2012-03-21		description:繪制半圓	*/	function drawArc(tangle, style){		 context.beginPath();		 var trunkGradient = context.createLinearGradient(X, Y, X, Y+4*R);         trunkGradient.addColorStop(0, style);         trunkGradient.addColorStop(1, '#FFF00F');         context.fillStyle = trunkGradient;		 		context.arc(X - (2*R*Math.cos(tangle)), Y - 2*R*Math.sin(tangle), 2*R, tangle, Math.PI+tangle, true);		context.closePath();		context.fill();		context.save();	}	/***		author:qingfeilee		date:2012-03-21		description:繪制手把柄	*/	function drawHandle(){		 var trunkGradient = context.createLinearGradient(X, Y, X+10, Y);         trunkGradient.addColorStop(0, '#663300');         trunkGradient.addColorStop(0.4, '#996600');         trunkGradient.addColorStop(1, '#552200');         context.fillStyle = trunkGradient;         context.fillRect(X, Y, 0.2*R, 8*R);	}		/***		author:qingfeilee		date:2012-03-21		description:繪制文字	*/	function drawText(){		 context.font = "30px 宋體 bold";         context.textAlign = 'center';		 context.fillText('那年我們一起看過的大風車', X, canvasWidth - 300, 300);	}	/***		author:qingfeilee		date:2012-03-21		description:繪制函數	*/	var tangle = 0;	function draw(){		tangle = tangle + (speed*1/32)*Math.PI;		context.clearRect(0,0,canvasWidth,canvasHeight);		drawHandle();		drawText();		drawArc(tangle,"#552200");		drawArc(tangle+1/2*Math.PI, "#990000");		drawArc(tangle+Math.PI, "#0033FF");		drawArc(tangle+3/2*Math.PI, "#225500");		document.getElementById("tip_info").innerHTML = "轉動角度："+parseInt(tangle)+"    當前的風速："+speed;	}		window.addEventListener("load",init,true);</script></head><body>	<div   class="iwvjtn8m0"   id="box">		<canvas id = "windmill" style = "background-color:#001111" width = "800px" height = "600px"></canvas>		<div   class="iwvjtn8m0"   id = "tip_info"></div>        <div>        	<button onClick="setSpeed(0)">停止</button>        	<button onClick="setSpeed(0.1)">微風</button>        	<button onClick="setSpeed(0.5)">小風</button>            <button onClick="setSpeed(1)">中風</button>            <button  onClick="setSpeed(2)">大風</button>            <button  onClick="setSpeed(4)">狂風</button>            |            <button onClick="setR(5)">小號</button>        	<button onClick="setR(20)">中號</button>        	<button onClick="setR(30)">大號</button>            <button onClick="setR(35)">超大號</button>        </div>    </div></body></html>

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