仅使用SVG <animate>的形状为“ 8”的循环动画

使用 {strong> <animate attributeName="cx"><attributeName="cy">的组合来寻找最佳点以实现“ 8”字形动画时,我非常头痛。 > 我愿意使用它,因为按照我的指标,它在FPS,CPU和GPU使用方面似乎是性能最高的。

“理想”运动路径的快速演示:https://codepen.io/ivancis/pen/eYmZowz

weishuai7894 回答:仅使用SVG <animate>的形状为“ 8”的循环动画

您没有说您真正想要哪种动画。

因此,我将提供不同类型动画的示例,您可以选择它们中的任何一个并以某种方式自行修改。

无限符号移动动画

<svg xmlns="http://www.w3.org/2000/svg"  width="400" height="100" viewBox="0 0 100 100">
  
  <path fill="none" stroke="dodgerblue" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="#d3d3d3" stroke-width="10">  
        <animateTransform
          attributeName="transform"
          type="translate"
          values="0; 150; 0"
          begin="0s"
          dur="4s"
          repeatCount="indefinite" /> 
	</path> 
</svg>	

旋转

将鼠标悬停在符号上

.infinity1{
transform-box: fill-box;
 transform-origin: center center;
 transition: rotate 2s linear ;
}
.infinity1:hover {
animation: spin 2s linear infinite;
}

@keyframes spin {
100% {transform :rotate(360deg);}

}
<svg xmlns="http://www.w3.org/2000/svg"  width="100" height="100" viewBox="0 0 100 100">
  
  <path class="infinity1" fill="none" stroke="dodgerblue" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="#d3d3d3" stroke-width="10"  />  
        
	
</svg>

绕Y轴旋转

.infinity1{
transform-box: fill-box;
 transform-origin: center center;
 transition: rotate 2s linear ;
 fill:transparent;
}
.infinity1:hover {
animation: spin 2s linear infinite;
}

@keyframes spin {
100% {transform :rotateY(360deg);}

}
<svg xmlns="http://www.w3.org/2000/svg"  width="100" height="100" viewBox="0 0 100 100" >
  
  <path class="infinity1"  stroke="dodgerblue" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="#d3d3d3" stroke-width="10"  />  
        
	
</svg>	

通过更改属性stroke-dasharray填充无穷大符号的动画

点击圆圈中的彩色字母

.container {
width:40%;
height="40%";  
  
  background:black;
}
<div class="container">
<svg xmlns="http://www.w3.org/2000/svg"  viewBox="0 20 100 100">
  
  <path fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="#d3d3d3" stroke-width="10"  />  
       <!-- The midpoint of the beginning of the animation in the center of the figure. stroke-dashoffset="31.1" -->
	<path id="center" fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="crimson" stroke-width="10" stroke-dashoffset="31.1" stroke-dasharray="0 128.5" >  
      <animate  attributeName="stroke-dasharray" values="0 128.5 0 128.5;0 0 257 0" begin="btn_C.click" dur="4s" restart="whenNotActive" /> 
	</path> 
	  <!-- Middle point on the left stroke-dashoffset="-159.5" -->
	    <path id="Left" fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="yellowgreen" stroke-width="10" stroke-dashoffset="-159.5" stroke-dasharray="0 128.5" >  
      <animate attributeName="stroke-dasharray" values="0 128.5 0 128.5;0 0 257 0" begin="btn_L.click" dur="4s"  restart="whenNotActive" /> 
	</path>  
	
	   <!-- Midpoint left top stroke-dashoffset="128.5" -->
	    <path id="Top" fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="gold" stroke-width="10" stroke-dashoffset="128.5" stroke-dasharray="0 128.5" >  
      <animate attributeName="stroke-dasharray" values="0 128.5 0 128.5;0 0 257 0" begin="btn_T.click" dur="4s"  restart="whenNotActive" /> 
	</path> 
	    <!-- Midpoint lower right  stroke-dashoffset="192.7" -->
	 <path id="Bottom" fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="dodgerblue" stroke-width="10" stroke-dashoffset="192.7" stroke-dasharray="0 128.5" >  
      <animate attributeName="stroke-dasharray" values="0 128.5 0 128.5;0 0 257 0" begin="btn_B.click" dur="4s"  restart="whenNotActive" /> 
	</path>   
	
	       <!-- Middle point on the right   stroke-dashoffset="223.9" -->
	 <path id="Bottom" fill="none" d="M24.3 30C11.4 30 5 43.3 5 50s6.4 20 19.3 20c19.3 0 32.1-40 51.4-40C88.6 30 95 43.3 95 50s-6.4 20-19.3 20C56.4 70 43.6 30 24.3 30z" stroke="purple" stroke-width="10" stroke-dashoffset="223.9" stroke-dasharray="0 128.5" >  
      <animate attributeName="stroke-dasharray" values="0 128.5 0 128.5;0 0 257 0" begin="btn_R.click" dur="4s"  restart="whenNotActive" /> 
	</path> 
	
	
	
 <g id="btn_L" transform="translate(-17 0)" >
      <rect x="20" y="84" width="15" height="15" rx="7.5" fill="none" stroke="#B2B2B2"/>
	     <text x="25" y="95" font-size="10" fill="green" >L</text>
    </g> 	
	<g id="btn_C" transform="translate(3 0)">
      <rect x="20" y="84" width="15" height="15" rx="7.5" fill="none" stroke="#B2B2B2"/>
	     <text x="24" y="95" font-size="10" fill="crimson" >C</text>
    </g> 
	   
	    <g id="btn_T" transform="translate(23 0)">
      <rect x="20" y="84" width="15" height="15" rx="7.5" fill="none" stroke="#B2B2B2"/>
	     <text x="24" y="95" font-size="10" fill="orange" >T</text>
        </g>  
  <g id="btn_B" transform="translate(43 0)">
	<rect x="20" y="84" width="15" height="15" rx="7.5" fill="none" stroke="#B2B2B2"/>
	 <text x="25" y="95" font-size="10" fill="dodgerblue" >B</text>
  </g>	  
      <g id="btn_R" transform="translate(63 0)">
	    <rect x="20" y="84" width="15" height="15" rx="7.5" fill="none" stroke="#B2B2B2"/>
	      <text x="25" y="95" font-size="10" fill="purple" >R</text>
    </g>	
</svg>
</div>

Live Demo

,

评论中的细化导致新的解决方案

我只需要使用组合动画svg元素 <animate attributeName="cx"> <animate attributeName="cy">(对于 性能)来使运动成“ 8”形,循环

由于作者不想使用animateMotion命令,因此在这种情况下 我只看到一种方法来实现沿无穷大符号的圆运动动画:

必须沿无穷大符号顺序选择许多点,并将其坐标分配给圆cx = "x"cy = "y"

选择的点越多,圆沿着无穷大符号的轨迹移动越近

enter image description here

在矢量编辑器中,我依次将圆放在无穷大符号上,并记下其在圆心的坐标。第一个圆的中心坐标为cx ="70" cy ="60"
因此,对沿无穷大符号定位的所有圆进行了此操作。最后一个圆与第一个圆具有相同的坐标,从而实现闭合循环

仅在动画公式cxcy

中替换这些值

圆周运动动画cxcy,半径为r="5

 <div class="group">
  
  <svg class="ball" xmlns="http://www.w3.org/2000/svg" width="50%" height="50%" viewBox="0 0 120 120">    
  
    
    <circle fill="olive" cx="70" cy="60" r="5">
      <animate
              attributeName="cx"
              attributeType="XML"
              repeatCount="indefinite"
              begin="0s"
              dur="2s"
              values="70;65;60;55;50;45;40.5;40.5;42.5;45.1;48.7;52;55;58;60;61;61;61;61;61;61;62.9;66;69;
			  73;76;79;81;80;78;74;70">
              
        </animate>
		  <animate
				  attributeName="cy"
				  attributeType="XML"
				  repeatCount="indefinite"
				  begin="0"
				  dur="2s"
				  values="60;60;60;60;60;58.3;52.5;47.9;44.4;41.8;40.3;40;41;43;47;51;55;60;65;70;74;77;79;
				  80;80;79;76;72;67;64;61;60">							 
		  </animate>   
	</circle>
	  	    
	   <path fill="none" stroke="black" stroke-dasharray="2" d="M70.5,60.5c5.5,10,4.5,10s-4.5,10-10,10s-10-4.5-10-10v-20c0-5.5-4.5-10-10-10s-10,4.5-10,10 s4.5,10H70.5z"/>
  </svg>
</div>
  

半径r = 40,例如问题作者的示例

 <div class="group">
  
  <svg class="ball" xmlns="http://www.w3.org/2000/svg" width="50%" height="50%" viewBox="0 0 120 120">    
  
    
    <circle fill="olive" cx="70" cy="60" r="40">
      <animate
              attributeName="cx"
              attributeType="XML"
              repeatCount="indefinite"
              begin="0s"
              dur="2s"
              values="70;65;60;55;50;45;40.5;40.5;42.5;45.1;48.7;52;55;58;60;61;61;61;61;61;61;62.9;66;69;
			  73;76;79;81;80;78;74;70">
              
        </animate>
		  <animate
				  attributeName="cy"
				  attributeType="XML"
				  repeatCount="indefinite"
				  begin="0"
				  dur="2s"
				  values="60;60;60;60;60;58.3;52.5;47.9;44.4;41.8;40.3;40;41;43;47;51;55;60;65;70;74;77;79;
				  80;80;79;76;72;67;64;61;60">							 
		  </animate>   
	</circle>
	  	    
	   <path fill="none" stroke="black" stroke-dasharray="2" d="M70.5,10H70.5z"/>
  </svg>
</div>
  

,

我正在研究类似的问题,并且遇到了这个答案。 @Alexandr_TT的回答使我开始思考一种更灵活的方法,而无需使用图形编辑器(例如Inkscape等)

我想到了以下想法:

  • 在第一个循环中使用<AnimateMotion/>
  • 每X毫秒触发一次setInterval,并在每次触发以捕获圆的中心点时触发(从circle.getBoundingClientRect()svg.matrixTransform()开始)
  • 将这些x和y值推入两个数组以捕获它们
  • 当AnimateMotion结束时,清除当前的setInterval并将第一个元素也推到每个数组的末尾(以关闭循环)
  • 从DOM中删除<AnimateMotion/>标签
  • 将这些数组推到<animate id="cx" attributeName="cx" values="" .../><animate id="cy" attributeName="cy" values="" .../>标签的values属性中
  • 使用cx.beginElement()cy.beginElement()将这两个动画标签开始

您可能对此性能感到满意,也可以使用其values="..."属性复制粘贴DOM元素并将其保存为新的主文件,从而基本上实现了@Alexandr_TT在图形编辑器中所做的工作。当然,如果您决定更改路径等,我展示的这种方法很灵活。

演示:https://codepen.io/Alexander9111/pen/VwLaNEN

HTML:

<circle id="circle" class="circle" cx="0" cy="00" r="125">          
      <animateMotion
           path="M162.9,150c6.8-0.2,12.1-5.7,12.1-12.5c0-6.9-5.6-12.5-12.5-12.5c-6.8,0-12.3,5.4-12.5,12.2v25.7 c-0.2,6.8-5.7,12.2-12.5,12.2c-6.9,0-12.5-5.6-12.5-12.5c0-6.8,5.4-12.3,12.1-12.5L162.9,150z"
           dur="4s" begin="0s"
           epeatCount="1" fill="freeze"
           calcMode="linear"
           fill="freeze">
      </animateMotion>
      <animate id="cx" attributeName="cx" values="" dur="4s" repeatCount="indefinite" begin="indefinite"/>
      <animate id="cy" attributeName="cy" values="" dur="4s" repeatCount="indefinite" begin="indefinite"/>
</circle>

JS:

const svg = document.querySelector('svg');
const animateElem = document.querySelector('animateMotion');
const circle = document.querySelector('#circle');
const cx = document.querySelector('#cx');
const cy = document.querySelector('#cy');
let myInterval;
let valuesX = [];
let valuesY = [];

function startFunction() {
  const box = circle.getBoundingClientRect();
  var pt = svg.createSVGPoint();
  pt.x = (box.left + box.right) / 2;
  pt.y = (box.top + box.bottom) / 2;
  var svgP = pt.matrixTransform(svg.getScreenCTM().inverse());
  console.log(svgP.x,svgP.y)
  valuesX.push(svgP.x);
  valuesY.push(svgP.y);
}

function endFunction() {  
  animateElem.parentNode.removeChild(animateElem);
  clearInterval(myInterval)
  valuesX.push(valuesX[0]);
  valuesY.push(valuesY[0]);
  cx.setAttribute('values',valuesX.join('; '));
  cy.setAttribute('values',valuesY.join('; '));
  circle.setAttribute('cx',0);
  circle.setAttribute('cy',0);  
  cx.beginElement();
  cy.beginElement();
}

animateElem.addEventListener('beginEvent',() => {
  console.log('beginEvent fired');
  myInterval = setInterval(startFunction,50);
})

animateElem.addEventListener('endEvent',() => {
  console.log('endEvent fired');
  endFunction();
})
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