D3.js 动画旋转 [英] D3.js animate rotation

问题描述

当我尝试使用 D3.js 库正确执行旋转动画时遇到问题.问题与我想要旋转元素的点有关.

I'm having trouble when I try to correctly execute a rotation animation using the D3.js library. The problem has to do with the point at which I want to rotate the element about.

这是我用来展示我的意思的小提琴(慢动作):http://jsfiddle.net/74mCb/

Here is a fiddle I made to show what I mean (in slow motion): http://jsfiddle.net/74mCb/

问题的根源似乎在这里:

It seems like the source of the problem lies here:

.attr("transform", "rotate(-60, 150,130)");

然后我像这样旋转它:

.attr("transform", "rotate(40 150,130)");

我希望针尖保持在原位(作为旋转中心)，有人可以解释一下我做错了什么吗?

I would like the butt of the needle to stay in position (to be the center of rotation), could someone please explain what I am doing wrong?

谢谢！

推荐答案

这有点难掌握(我自己也不是很明白)但是 D3 需要一些帮助来知道如何在代表您的两个字符串之间进行插值旋转.

This is a bit tricky to grasp (I don't fully understand it myself) but D3 needs some help knowing how to interpolate between the two strings that represent your rotation.

function turnNeedle()
{

    needle
      .transition()
      .duration(2000)
      .attrTween("transform", tween);

    function tween(d, i, a) {
      return d3.interpolateString("rotate(-60, 150, 130)", "rotate(60, 150, 130)");
    }

}

d 是数据，i 是索引，a 是属性，以防你想让这个数据驱动.

d is the datum, i is the index, a is the attribute in case you want to make this data-driven.

http://jsfiddle.net/SHF2M/

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