Anime.js SVG形态动画破坏形状路径

Question

我试图使用Anime.js将圆的SVG (使用对象>复合路径>Make转换为路径)转换为正方形(转换方式相同)，但当时间线运行时，圆圈形状会被扭曲，就好像路径没有被正确地解释一样。

不过，正方形看起来还不错。

作为测试，您可以从标记中的SVG中删除shape的目标类，以防止Anime.js运行，圆圈将正确显示。

为什么Anime.js看不懂我的圆圈？

​

const circlePath = 'M153.1,49.5c63.2,0,114.5,51.3,114.5,114.5s-51.3,114.5-114.5,114.5S38.6,227.2,38.6,164S89.9,49.5,153.1,49.5z';
const squarePath = 'M270.7,275.7H23.9V31h246.8V275.7z';

var timeline = anime.timeline({
  autoplay: true,
  direction: "alternate",
  loop: true
});

timeline.add({
  targets: ".shape",
  d: {
    value: [
      circlePath,
      squarePath
    ],
    duration: 1500,
    easing: "easeInOutQuad"
  },
  offset: 1500
});

svg {
  margin: 1rem;
  border: 2px solid #666;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/2.2.0/anime.min.js"></script>
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="300px" height="300px" viewBox="0 0 300 300" style="enable-background:new 0 0 300 300;" xml:space="preserve">
  <path class="shape" fill="blue" d="M153.1,49.5c63.2,0,114.5,51.3,114.5,114.5s-51.3,114.5-114.5,114.5S38.6,227.2,38.6,164S89.9,49.5,153.1,49.5z"/>
</svg>

​

Answer 1

要实现从一种形状到另一种形状的平滑变形，必须满足以下几个条件：

，

• ，在初始图形中的节点数和最终图形必须是相同的

，

• ，从路径开始时，相同的节点点应该具有相同的形状。(C，Q，T，S表示bezier曲线)

您可以使用任何向量编辑器获得满足这些要求的路径。

假设你想要实现将一个圆圈平滑地变形成一个矩形

在向量编辑器中画一个圆圈

在对角线上再加上四个点，就需要它们将圆形的等高线转换成一个正方形。

​

​

将文件保存为* .svg格式，并将path复制到另一个文件。这将是变形的初始数字。接下来，将这四个锚点拖到正方形的角上，并调整锚点的控制点(图中的蓝色箭头)。

​

再次将文件保存在向量编辑器中，并复制第二个path，这将是最后的形态图。

将path替换为应用程序中的初始和最终元素：

​

const circlePath = 'm268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z';
const squarePath = 'm268.3 164.3c0 31.4 0 86.7 0 115.1-26.6 0-82.9 0-115.1 0-31.5 0-73.4 0-114.2 0-0.9-26.3-0.9-83.1-0.9-115.1 0-31.1 0-87 0-115.1 26 0 82.6 0 115.1 0 32.3 0 91.9 0 115.1 0.9 0 30.9 0 83 0 114.2z';

var timeline = anime.timeline({
  autoplay: true,
  direction: "alternate",
  loop: true
});

timeline.add({
  targets: ".shape",
  d: {
    value: [
      circlePath,
      squarePath
    ],
    duration: 1500,
    easing: "easeInOutQuad"
  },
  offset: 500
});

svg {
  margin: 1rem;
  border: 2px solid #666;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/2.2.0/anime.min.js"></script>
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="300px" height="300px" viewBox="0 0 300 300" style="enable-background:new 0 0 300 300;" xml:space="preserve">
  <path class="shape" fill="blue" d="m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z"/>
</svg>

​

最困难的事情是得到正确的path 公式。有了它们，您可以使用纯SVG实现不使用Javascript的变形。

​

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink"
	  
     width="300" height="300" viewBox="0 0 300 300" >  
 <style>
  path {
  fill:dodgerblue;
  stroke:none;
  }
 </style>
 
<path  d="m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z" stroke="black" fill="dodgerblue">
   <animate attributeName="d"
     begin="0s"
	 dur="3s"
	 values="
	         m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z;
			 
			 m268.3 164.3c0 31.4 0 86.7 0 115.1-26.6 0-82.9 0-115.1 0-31.5 0-73.4 0-114.2 0-0.9-26.3-0.9-83.1-0.9-115.1 0-31.1 0-87 0-115.1 26 0 82.6 0 115.1 0 32.3 0 91.9 0 115.1 0.9 0 30.9 0 83 0 114.2z"
			 repeatCount="indefinite"
			 fill="freeze"
	/>		 
 </path> 
</svg>	

​

反向运动

​

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink"
	  
     width="300" height="300" viewBox="0 0 300 300" >  
 <style>
  path {
  fill:dodgerblue;
    }
 </style>
 
<path  d="m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z">
   <animate attributeName="d"
     begin="0s"
	 dur="5s"
	 values="
	         m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z;
			 
			 m268.3 164.3c0 31.4 0 86.7 0 115.1-26.6 0-82.9 0-115.1 0-31.5 0-73.4 0-114.2 0-0.9-26.3-0.9-83.1-0.9-115.1 0-31.1 0-87 0-115.1 26 0 82.6 0 115.1 0 32.3 0 91.9 0 115.1 0.9 0 30.9 0 83 0 114.2z;
			 
			 m268.3 164.3c0 31.4-12.6 59.9-33 80.7-20.9 21.2-49.9 34.4-82 34.4-31.5 0-60.1-12.7-80.9-33.3-21.1-20.9-34.1-49.8-34.1-81.8 0-31.1 12.3-59.3 32.4-80 20.9-21.6 50.2-35.1 82.7-35.1 32.3 0 61.6 13.3 82.5 34.8 20.2 20.7 32.6 49 32.6 80.2z;"
			 
			 repeatCount="indefinite"
			 fill="freeze" 	/>		 
			 
 </path> 

</svg>

​

平滑的变形动画也可以用SnapJS完成。

​

var svg = document.getElementById("svg1");
var s = Snap(svg);

var simpleCup = Snap.select('#coffee-cup');
var fancyCup = Snap.select('#fancy-cup');

var simpleCupPoints = simpleCup.node.getAttribute('d');
var fancyCupPoints = fancyCup.node.getAttribute('d');


var toFancy = function(){
  simpleCup.animate({ d: fancyCupPoints }, 1000, mina.backout, toSimple);  
}

var toSimple = function(){
  simpleCup.animate({ d: simpleCupPoints }, 1000, mina.backout, toFancy); 
}


toSimple();

 <svg id="svg1" width="100" height="130" viewBox="0 0 75 47" xmlns="http://www.w3.org/2000/svg">
	<path id="coffee-cup" fill="#5F0C2D" stroke="#5F0C2D"  d="M0.4 5.9C0.4 6.3-0.3 17.8 4.3 31.2 5.3 32.4 6.1 37.9 7.5 43 10.4 53.6 10 58.2 10 58.2 10 58.2 10 59.1 10 62.2L10 63.4 15 65.7C20.1 67.8 34 67.6 38.6 65.7L44 64 44 62.2C44 60.3 44 61.2 44 59.6 44 59.6 44 58.2 44 58.2 44 58.2 44 56 44 56 44 56.1 44.2 52.2 44.2 52.2 44.2 52.2 44.5 49.3 44.5 49.3 44 47 46.8 39.1 47.6 38.8 48.4 38.6 52.8 37.6 55.4 37 62.3 36.7 68.5 30.5 68.5 26.9 68.5 25.1 68.5 20.3 66.1 17.8 63.5 14.8 60.4 14.1 56.7 14.2 54.2 14.3 54.2 12.8 54 12.6 53.8 12.5 54 12.6 54 10.8L53.3 6.7 51.3 4.6C49.8 3.6 47.5 3 44.7 2.2 38.3 0.5 20.1 0 12.7 1.4 7 2.4 0.4 4.7 0.4 5.9ZM64.8 22.9C64.8 25.9 65.5 27.9 60.6 31.8 59.6 32.6 64 30.3 62.9 30.8 60.9 31.9 53.6 32.7 52.4 31.8 51.6 31.1 51.1 29.8 51 28 51.3 24.6 52.1 22.1 53.6 20.4 57.4 16 64.8 19.2 64.8 22.9Z"  />
    <path opacity="0"  id="fancy-cup" fill="#5F0C2D" stroke="#5F0C2D"  d="M0 6.8C0 7.2 0.9 8.5 1.9 9.6 2.9 10.8 4.9 15.9 6.3 21 9.2 31.6 12.4 36.5 17.5 38.2 21.6 39.6 21.7 39.8 18.8 42.2L16.5 44 19.5 45.3C24.6 47.4 37 47.6 41.6 45.7L45.5 44.1 43.1 42.1C41 40.4 40.9 39.9 42.1 39.1 42.8 38.6 44.2 38.2 45.1 38.2 47 38.2 52.4 33.5 53.2 31.2 53.6 29.9 53.9 29.9 55.3 31 57.5 32.9 59.1 31.6 58.4 28.6 58 27 58.3 26.1 59.1 25.8 59.9 25.6 62.6 24.8 65.2 24.2 70.7 22.7 75 19 75 15.5 75 13.7 74.1 12.7 71.3 11.6 68 10.2 67.3 10.2 63.7 11.6 61.4 12.5 59.5 13 59.3 12.8 59.1 12.7 59.9 11.3 61 9.9L63.1 7.3 60.5 5.6C59 4.6 55.5 3.2 52.7 2.4 46.3 0.7 21.5-0.1 14.1 1.3 8.4 2.3 0 5.6 0 6.8ZM70 15.6C70 18.6 65.7 22.2 62.3 22.2 61 22.2 59 22.7 57.9 23.2 55.9 24.3 55.5 23.6 56.6 20.8 56.9 19.9 57.6 19.5 58.1 19.8 58.6 20.1 60.5 18.7 62.2 16.8 66 12.4 70 11.9 70 15.6Z"  />

</svg>
  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.5.1/snap.svg-min.js"></script>

​