在JQuery中使图像遵循循环路径的最佳方法是什么？ [英] Best way to make an image follow a circular path in JQuery?

问题描述

我有一个图像（红色，下面），我想沿着圆形路径行进。红色图像应始终与开始时位于同一位置。

I have an image (red, below), that I want to make travel along a circular path. The red image should always end in the same spot as it started.

注意：
灰色圆形路径不可见。我只是强调它将遵循的路径。

Notes: The grey circular path is invisible. I am just highlighting the path it will follow.

实现这种技术的最佳方法/库是什么？

What is the best method/library to achieve this technique?

推荐答案

你真的需要一个图书馆，这并不难吗

Do you really need a library, it's not that hard to do

$(document).ready(function (e) {
    var startAngle = 0;
    var unit = 215;

    var animate = function () {
        var rad = startAngle * (Math.PI / 180);
        $('.circle').css({
            left: 250 + Math.cos(rad) * unit + 'px',
            top: unit * (1 - Math.sin(rad)) + 'px'
        });
        startAngle--;
    }
    var timer = setInterval(animate, 10);
});

FIDDLE

这是一个循环播放，停在同一个地方等等。

Here's one that does one loop, stops at the same place etc.

$(document).ready(function (e) {
    var startAngle = 180;
    var unit = 215;

    var animate = function () {
        if (startAngle > -180) {
            var rad = startAngle * (Math.PI / 180);
            $('.circle').css({
                left: 250 + Math.cos(rad) * unit + 'px',
                top: unit * (1 - Math.sin(rad)) + 'px'
            });
            startAngle--;
            setTimeout(animate, 10);
        }
    }

    $('.circle').on('click', function() {
        startAngle = 180;
        animate();
    });

});

FIDDLE

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