带有起始圆的SVG进度栏动画 [英] SVG Progressbar Animation with start circle

问题描述

是否可以沿线路径对圆进行动画处理?

Is it possible to animate circle along with the line path ?

我尝试了以下代码.我可以合并两条直线路径和圆并对其应用过渡吗

I have tried following code.can i merge the two line path and circle and apply transition for the same

  $(document).ready(function(){
  
  var svgPath = document.getElementById('heart'); 
  
var path = new ProgressBar.Path(svgPath, {
    duration: 3000
});
path.animate(-1, {
	easing: 'easeOutBounce',
    duration: 2000
}, function() {
    console.log('Animation has finished');
});
  });
  

 #container {
	width:220px;
  position: relative;
}

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://rawgit.com/kimmobrunfeldt/progressbar.js/1.0.0/dist/progressbar.js"></script>
 <div id="container" style="width:200px;height:200px;">

    <svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100.08 100" width="500" height="500">
    <path d="M50,2A48,48,0,1,1,2,50,48,48,0,0,1,50,2" fill-opacity="0" stroke="#eee"/>
    <circle  cx="95.87" cy="64.33" r="2.66"/>
    <path  id="heart" fill-opacity="0"  d="M95.6,65.16A48,48,0,1,1,50,2" fill="none" stroke="#000" />
    </svg>


    </div>

推荐答案

该库允许您传递step函数，该函数针对动画中的每个步骤都被调用.

That library allows you to pass a step function that is called for every step in the animation.

使用value()函数返回的值以及几个方便的SVG路径函数，可以计算进度线末端的坐标.然后，您可以使用这些坐标来定位圆.

Using that, the value returned by the value() function, and a couple of handy SVG path functions, you can calculate the coordinates of the end of the progress line. You can then use those coordinates to position the circle.

下面的演示

$(document).ready(function(){
  
  var svgPath = document.getElementById('heart'); 
  
  var shape = new ProgressBar.Path(svgPath);
  var pathLen = shape.path.getTotalLength();

  shape.animate(-1, {
	easing: 'easeOutBounce',
    duration: 2000,
    attachment: document.getElementById("circle"),
    step: function(state, shape, attachment) {
      // 'attachment' is a DOM reference to the circle element
      var val =  1 + shape.value();  // buggy value() function?
      var endPosition = shape.path.getPointAtLength(val * pathLen);
      attachment.cx.baseVal.value = endPosition.x;
      attachment.cy.baseVal.value = endPosition.y;
    }
  }, function() {
    console.log('Animation has finished');
  });

});

#container {
  width:220px;
  position: relative;
}

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://rawgit.com/kimmobrunfeldt/progressbar.js/1.0.0/dist/progressbar.js"></script>
 <div id="container" style="width:200px;height:200px;">

    <svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100.08 100" width="500" height="500">
    <path d="M50,2A48,48,0,1,1,2,50,48,48,0,0,1,50,2" fill-opacity="0" stroke="#eee"/>
    <circle id="circle" cx="95.87" cy="64.33" r="2.66"/>
    <path  id="heart" fill-opacity="0"  d="M95.6,65.16A48,48,0,1,1,50,2" fill="none" stroke="#000" />
    </svg>


    </div>

请注意，该库似乎存在错误.根据文档，value()函数应该返回0和1之间的值.但是，它将返回0和-1之间的值.再加上它是从后到前的.因此，为了获得正确的进度值，我必须将1添加到shape()的值.如果您曾经更新到可解决此错误的库的新版本，则可能必须更改此代码.

Note that the library seems to have a bug. According to the docs, the value() function is supposed to return a value between 0 and 1. However it returns a value between 0 and -1. Plus it's back-to-front. So to get the right progress value, I had to add 1 to the value of shape(). If you ever update to a new version of the library that fixes this bug, you may have to alter this code.

这篇关于带有起始圆的SVG进度栏动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！