在 SVG 中定义圆/弧动画 [英] Define a circle / arc animation in SVG

问题描述

有谁知道如何在 SVG 中定义动画圆弧/圆，使圆弧从 0 度开始，到 360 度结束?

Does anyone know how to define an animated arc / circle in SVG, such that the arc starts at 0 degrees and ends at 360 degrees?

推荐答案

你可以使用path的lineto手工"绘制它并计算圆弧的位置:

you can paint it "by hand" using path's lineto and calculate the position of the arc:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"
   viewBox="0 0 1200 800"
   preserveAspectRatio="xMidYMid"
   style="width:100%; height:100%; position:absolute; top:0; left:0;"
   onload="drawCircle();"> 
  <script> 
    function drawCircle() {
        var i = 0;
        var circle = document.getElementById("arc");
        var angle = 0;
        var radius = 100;     
        window.timer = window.setInterval(
        function() {
            angle -=5;  
            angle %= 360;
            var radians= (angle/180) * Math.PI;
            var x = 200 + Math.cos(radians) * radius;
            var y = 200 + Math.sin(radians) * radius;
            var e = circle.getAttribute("d");
            if(i==0) {
                var d = e+ " M "+x + " " + y;
            }
            else {
                var d = e+ " L "+x + " " + y;
            }
            if (angle === -5 && i !== 0) {
                window.clearInterval(window.timer);
            }

            circle.setAttribute("d", d);
            i++;
        } 
      ,10)
    }
    </script> 

    <path d="M200,200 " id="arc" fill="none" stroke="blue" stroke-width="2" />
</svg>

http://jsfiddle.net/k99jy/138/

这篇关于在 SVG 中定义圆/弧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！