Javascript 椭圆路径上圆的svg动画
我尝试使用svg动画在椭圆路径上旋转圆,我尝试的代码是在圆形路径上旋转圆,而不是在我制作的椭圆上旋转圆,有人能在这个plz上帮助我吗Javascript 椭圆路径上圆的svg动画,javascript,html,svg,Javascript,Html,Svg,我尝试使用svg动画在椭圆路径上旋转圆,我尝试的代码是在圆形路径上旋转圆,而不是在我制作的椭圆上旋转圆,有人能在这个plz上帮助我吗 <!DOCTYPE html> <html> <head> <title>JavaScript SVG Animation</title> <style> /* CSS here. */ </style>
<!DOCTYPE html>
<html>
<head>
<title>JavaScript SVG Animation</title>
<style>
/* CSS here. */
</style>
<script>
/* CONSTANTS */
var initialTheta = 0; // The initial rotation angle, in degrees.
var thetaDelta = 0.3; // The amount to rotate the square every "delay" milliseconds, in degrees.
var delay = 10; // The delay between animation stills, in milliseconds. Affects animation smoothness.
var angularLimit = 360; // The maximum number of degrees to rotate the square.
var cx = 200; // circle center
var cy = 150; //circle center
/* GLOBALS */
var theCircle; // Will contain a reference to the square element, as well as other things.
var timer; // Contains the setInterval() object, used to stop the animation.
var pauseEvent = false;
function init()
{
theCircle = document.getElementById("s1"); // Set this custom property after the page loads.
theCircle.currentTheta = initialTheta; // The initial rotation angle to use when the animation starts, stored in
timer = setInterval(doAnim, delay); // Call the doAnim() function every "delay" milliseconds until "timer" is cleared.
}
function doAnim()
{
if (theCircle.currentTheta > angularLimit)
{
clearInterval(timer); // The square has rotated enough, instruct the browser to stop calling the doAnim() function.
return; // No point in continuing; stop now.
}
theCircle.setAttribute("transform", "rotate(" + theCircle.currentTheta + "," + cx + "," + cy +")"); // Rotate the square by a small amount. around given circle point
theCircle.currentTheta += thetaDelta; // Increase the angle that the square will be rotated to, by a small amount.
}
window.onload = function(){
var elplay = document.getElementById("play");
elplay.addEventListener("click", function(){
if(!pauseEvent){
init();
doAnim();
} else{
init();
doAnim();
pauseEvent = false;
}
}, false);
var elstop = document.getElementById("stop");
elstop.addEventListener("click", function(){
theCircle.currentTheta = 0 //initialTheta; // The initial rotation angle to use when the animation starts, stored in
theCircle.setAttribute("transform", "rotate(" + theCircle.currentTheta + "," + cx + "," + cy +")"); // Rotate the square by a small amount. around given circle point
clearInterval(timer); // The square has rotated enough, instruct the browser to stop calling the doAnim() function.
return; // No point in continuing; stop now.
}, false);
var elpause = document.getElementById("pause");
elpause.addEventListener("click", function(){
initialTheta = theCircle.currentTheta;
pauseEvent = true;
clearInterval(timer); // The square has rotated enough, instruct the browser to stop calling the doAnim() function.
return; // No point in continuing; stop now.
}, false);
}
</script>
</head>
<body>
<button id = "play" style="position: absolute;">Play</button>
<button id = "pause" style="position: absolute;left: 65px;">Pause</button>
<button id = "stop" style="position: absolute;left: 135px;">Stop</button>
<svg width="800px" height="800px" viewBox="0 0 800 800">
<g transform="translate(200, 150)">
<ellipse id = "s2" cx = "200" cy = "150" rx = "200" ry = "150" fill = "salmon" stroke = "black" stroke-width = "3"/>
<circle id = "s1" cx = "250" cy = "10" r = "20" fill = "yellow" stroke = "black" stroke-width = "3"/>
</g>
</svg>
</html>
JavaScript SVG动画
/*这里是CSS*/
/*常数*/
var initialTheta=0;//初始旋转角度,以度为单位。
var thetaDelta=0.3;//每“延迟”毫秒旋转正方形的量,单位为度。
var延迟=10;//动画静止之间的延迟,以毫秒为单位。影响动画平滑度。
var angularLimit=360;//旋转正方形的最大度数。
变量cx=200;//圆心
var-cy=150//圆心
/*全球的*/
var theCircle;//将包含对方形元素的引用以及其他内容。
变量计时器;//包含用于停止动画的setInterval()对象。
var pauseEvent=false;
函数init()
{
theCircle=document.getElementById(“s1”);//在页面加载后设置此自定义属性。
theCircle.currentTheta=initialTheta;//动画开始时使用的初始旋转角度,存储在
timer=setInterval(doAnim,delay);//每隔“delay”毫秒调用一次doAnim()函数,直到清除“timer”。
}
函数doAnim()
{
if(圆圈电流θ>角度极限)
{
clearInterval(timer);//正方形旋转足够大,指示浏览器停止调用doAnim()函数。
return;//继续没有意义;现在停止。
}
setAttribute(“transform”、“rotate”(+theCircle.currentTheta+”、“+cx+”、“+cy+”);//围绕给定的圆点,将正方形旋转一小段
theCircle.currentTheta+=thetaDelta;//稍微增加正方形旋转的角度。
}
window.onload=函数(){
var elplay=document.getElementById(“play”);
elplay.addEventListener(“单击”,函数(){
如果(!pauseEvent){
init();
doAnim();
}否则{
init();
doAnim();
pauseEvent=false;
}
},假);
var elstop=document.getElementById(“停止”);
addEventListener(“单击”,函数(){
theCircle.currentTheta=0//initialTheta;//动画开始时使用的初始旋转角度,存储在
setAttribute(“transform”、“rotate”(+theCircle.currentTheta+”、“+cx+”、“+cy+”);//围绕给定的圆点,将正方形旋转一小段
clearInterval(timer);//正方形旋转足够大,指示浏览器停止调用doAnim()函数。
return;//继续没有意义;现在停止。
},假);
var elpause=document.getElementById(“暂停”);
elpause.addEventListener(“单击”,函数(){
initialTheta=电路电流Theta;
pauseEvent=true;
clearInterval(timer);//正方形旋转足够大,指示浏览器停止调用doAnim()函数。
return;//继续没有意义;现在停止。
},假);
}
玩
暂停
停止
我认为它没有遵循你的思路是因为你的数学有点不对劲。您正在绘制椭圆,但旋转数学是圆形的。要么纠正你的数学错误,要么最好还是听从佛洛兹的建议,学习SMIL
以下是一些SVG帮助您入门:
我认为它没有遵循你的思路是因为你的数学有点不对劲。您正在绘制椭圆,但旋转数学是圆形的。要么纠正你的数学错误,要么最好还是听从佛洛兹的建议,学习SMIL 以下是一些SVG帮助您入门:
只使用内置SMIL是不可接受的吗?只使用内置SMIL是不可接受的吗?