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Javascript production svg progress ball example sharing

小云云

Mar 15, 2018 am 09:27 AM

javascriptjsshare

With the development of SVG to this day, it has been used in various applications on the Internet, including the production of progress bars and progress balls. How to make this type of animated interaction? Let’s reveal the secret to you next!

1. Interest Guidance > Final effect - SVG progress ball:

Javascript production svg progress ball example sharing

2. HTML (including SVG) Structure

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
	<style type="text/css">
		.perText{font-size:58pt;font-family:Arial Rounded MT Bold;fill:#AD054A;text-anchor:middle;dominant-baseline: middle;text-shadow: 3px 0 6px #fff;transform:translate3d(6px,0,0);}
	</style>
</head>
<body>
<svg xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="384.415px" height="383.232px" viewBox="0 0 384.415 383.232" >
	<circle style="fill:#E8427D;" cx="192.668" cy="195.399" r="180"/>
	<circle style="fill:#FFFFFF;" cx="192.668" cy="195.399" r="150"/>
	<circle style="display:none;fill:none;stroke:#000000;stroke-miterlimit:10;" cx="796.667" cy="-58.434" r="140.123"/>
	<path style="fill:none;" d="M656.667,8386.899"/>
	<path style="fill:none;" d="M656.667-7996.101"/>
	<g>

		<!-- 定义变量 -->
		<defs>
			<circle id="SVGID_1_" cx="191.668" cy="195.069" r="135" fill="red"/>
		</defs>
		<clipPath id="SVGID_2_">
			<use xlink:href="#SVGID_1_"  style="overflow:visible;" cx="191.668" cy="295.069" />
		</clipPath>
		<linearGradient id="SVGID_3_" gradientUnits="userSpaceOnUse" x1="431.4199" y1="221.6279" x2="-31.4133" y2="488.8449">
			<stop  offset="0" style="stop-color:#DA1654"/>
			<stop  offset="0.6452" style="stop-color:#E1457C;stop-opacity:0.4731"/>
			<stop  offset="1" style="stop-color:#F7F8F8;stop-opacity:0.3"/>
		</linearGradient>
		<linearGradient id="SVGID_4_" gradientUnits="userSpaceOnUse" x1="462.0762" y1="286.5215" x2="-63.9186" y2="590.2048">
			<stop  offset="0" style="stop-color:#F7F8F8;stop-opacity:0.3"/>
			<stop  offset="0.5" style="stop-color:#E1457C;stop-opacity:0.4731"/>
			<stop  offset="0.871" style="stop-color:#DA1654"/>
		</linearGradient>
		
		<!-- clip-path:url(#SVGID_2_) -->
		<g class="group" id=&#39;pathGroup&#39; style="clip-path:url(#SVGID_2_)">
			<!--<path class="bgPath bgPath_01" style="fill:url(#SVGID_3_);" id="bgPathOne">
					<animate 
						dur="5s" 
						attributeName="d" 
						attributeType="XML" 
						repeatCount="indefinite" 
						values="" 
						calcMode="linear"
						keyTimes="0;.6;1"></animate>			
			</path> -->
			<path class="bgPath bgPath_02" style="fill:url(#SVGID_3_);" d="">
				<animate 
						dur="5s" 
						attributeName="d" 
						attributeType="XML" 
						repeatCount="indefinite" 
						values="" 
						calcMode="linear"
						keyTimes="0;.3;1"></animate>	
			</path>-->
		</g>
		
		<text x=&#39;192.668&#39; y=&#39;195.399&#39; class="perText">50%</text>
	</g>
</svg>
</body>
</html>

3. JavaScript calculates the path and controls the svg animation

class svgPercent
{

	constructor({y1,y2,group,text})
	{
		this.y1 = y1 ? y1 : 0;
		this.y2 = y2 ? y2 : 0;
		this.group = group;
		this.xmlns = &#39;http://www.w3.org/2000/svg&#39;;
		this.textBox = text;
		this.currentPercentText = &#39;0%&#39;;

		//初始 进度球
		this.init();
	}

	init()
	{	
		//1.获取路径数据
		this.getSvgPathData(this.y1,this.y2);
		
		//2.根据数据绘制路径
		this.createPath();

		//3.设置百分比
		this.setPercentText();

		//4.模拟进度增长的情况
		this.changePathShape();

	}

	initChangeShape()
	{
		//1.获取路径数据
		this.getSvgPathData(this.y1,this.y2);

		//2. 设置路径形状改变
		this.setPaths();
	}

	//获取路径数据
	getSvgPathData(y,y2)
	{
		this.d1=`M327.898,${225.235+y}c3.086,${-11.496+y},4.74,${-11.496+y},4.74,${-36.167+y}c0,${0+y},-31.712,${-28.628+y},-140.67,${-2+y}c-120.71,${29.5+y},-125.21,${11+y}-140.67,${0.35+y}c0.032,${13.105+y},1.862,${25.787+y},5.247,${37.817+y}h-90.043 v390 h467 v-390 H327.898 z`;

		this.a1=`M 327.898,${225.235+y}c 3.086,${-11.496+y},4.74,${-23.611+y},4.74,${-36.167+y}c 0,${0+y},-23.971,${54.165+y},-140.67,${-2+y}c-111.97,${-53.888+y}-135.301,${-9.835+y}-140.67,${0.35+y}c 0.032,${13.105+y},1.862,${25.787+y},5.247,${37.817+y}h-90.043 v390 h 467 v-390 H 327.898 z`;	

		this.d2 = `M 327.898,${237.031+y2}c 3.086,${-14.234+y2},4.74,${-29.236+y2},4.74,${-44.785+y2}c 0,${0+y2}-30.305,${36.653+y2}-140.67,${-2.477+y2}c-118.866,${-42.144+y2}-134.529,${-9.191+y2}-140.67,${0.434+y2}c 0.032,${16.229+y2},1.862,${31.933+y2},5.247,${46.828+y2}h-90.043 v 405.865 h 467 V ${237.031+y2} H 327.898 z`;

		this.a2 = `M 327.898,${237.031+y2}c 3.086,${-14.234+y2},4.74,${-29.236+y2},4.74,${-44.785+y2}c 0,${0+y2}-56.638,${-36.347+y2}-140.67,${-2.477+y2}C 74.997,${236.916+y2},63,${199.232+y2},51.299,${190.203+y2}c 0.032,${16.229+y2},1.862,${31.933+y2},5.247,${46.828+y2}h-90.043 v 405.865 h 467 V ${237.031+y2} H 327.898 z`;
	}

	//创建path路径
	createPath(group)
	{
		this.pathOne = document.createElementNS(this.xmlns,&#39;path&#39;);
		this.animate = document.createElementNS(this.xmlns,&#39;animate&#39;);
		this.pathOne.setAttribute(&#39;style&#39;,&#39;fill:url(#SVGID_3_)&#39;);
		this.pathOne.setAttribute(&#39;d&#39;,this.d1);
		this.animate.setAttribute(&#39;dur&#39;,&#39;5s&#39;);
		this.animate.setAttribute(&#39;attributeName&#39;,&#39;d&#39;);
		this.animate.setAttribute(&#39;attributeType&#39;,&#39;XML&#39;);
		this.animate.setAttribute(&#39;repeatCount&#39;,&#39;indefinite&#39;);
		this.animate.setAttribute(&#39;keyTimes&#39;,&#39;0;0.55;1&#39;);
		this.animate.setAttribute(&#39;values&#39;,this.d1+&#39;;&#39;+this.a1+&#39;;&#39;+this.d1);
		this.pathOne.appendChild(this.animate);
		this.group.appendChild(this.pathOne);	 
		
		this.pathTwo = document.createElementNS(this.xmlns,&#39;path&#39;);
		this.animate2 = document.createElementNS(this.xmlns,&#39;animate&#39;);
		this.pathTwo.setAttribute(&#39;style&#39;,&#39;fill:url(#SVGID_3_)&#39;);
		this.pathTwo.setAttribute(&#39;d&#39;,this.d2);
		this.animate2.setAttribute(&#39;dur&#39;,&#39;5s&#39;);
		this.animate2.setAttribute(&#39;attributeName&#39;,&#39;d&#39;);
		this.animate2.setAttribute(&#39;attributeType&#39;,&#39;XML&#39;);
		this.animate2.setAttribute(&#39;repeatCount&#39;,&#39;indefinite&#39;);
		this.animate2.setAttribute(&#39;keyTimes&#39;,&#39;0;0.55;1&#39;);
		this.animate2.setAttribute(&#39;values&#39;,this.d2+&#39;;&#39;+this.a2+&#39;;&#39;+this.d2);
		this.pathTwo.appendChild(this.animate2);
		this.group.appendChild(this.pathTwo);
	}

	//设置path路径
	setPaths()
	{
		this.pathOne.setAttribute(&#39;d&#39;,this.d1);
		this.pathTwo.setAttribute(&#39;d&#39;,this.d2);
		this.animate.setAttribute(&#39;values&#39;,this.d1+&#39;;&#39;+this.a1+&#39;;&#39;+this.d1);
		this.animate2.setAttribute(&#39;values&#39;,this.d2+&#39;;&#39;+this.a2+&#39;;&#39;+this.d2);
	}

	//设置百分比文字
	setPercentText(val)
	{	
		let vals = val ? val : this.currentPercentText;
		this.textBox.textContent = vals;
	}

	//改变路径形状
	changePathShape()
	{	
		let dis = 0.3;
		let percent = &#39;&#39;;
		let p = &#39;&#39;;
		let start = this.y1;
		let end = -50;

		let This = this;
		function step()
		{
			This.y1 -= dis;
			This.y2 -= dis;
			
			This.initChangeShape();
			percent = parseInt((Math.abs(This.y1 - start) / Math.abs(end-start))*100);
			p = percent + &#39;%&#39;;
			This.setPercentText(p);
			
			if(percent < 50){
				requestAnimationFrame(step);
			}
		}

		requestAnimationFrame(step);	
	}
}

// 初始化配置参数调用
let obj = {
	y1: 50,
	y2: 50,
	group: document.querySelector(&#39;#pathGroup&#39;),
	text: document.querySelector(&#39;.perText&#39;)
}

new svgPercent(obj);

4. Summary:

(1) Control the d attribute of the path through animate (note , there are pitfalls, values have at least three sets of values values="original value; value to be changed; original value")

(2) The d attribute of path is used through js control (note that there are pitfalls , when splicing strings, there cannot be a semicolon at the end, and an error will be reported; when splicing values, you need to add a semicolon separately)

(3) The use of clipPath tags is how this case implements rolling ripples from A core from bottom to top.

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