可拖拽圆形进度条组件（支持移动端）
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–>
好久之前写过一个可拖拽圆形进度条的dome，中间有网友反馈过一些问题，最近比较闲有时间修改了一些问题也做了一些优化，并封装成组件，基于canvas实现，只需传入放置组件dom容器，任何框架均可直接使用；
codepen 示例如下：https://codepen.io/pangyongsheng/pen/XRmNRK
一、如何使用
npm下载
执行 npm i drag-arc -S 或 cnpm i drag-arc -S
import DragArc from 'drag-arc';
new DragArc({
el: dom,
value: 10,
change: (v) => {
console.log(v)
},
...
})
或者 也可从项目下载dist/dist/drag-arc.min.js，直接通过srcipt标签引入
其中dom为放置组件HTML容器,可通过ref获取;
主要属性方法（详见github/npm）
项目地址：https://github.com/pangyongsheng/canvas-arc-draw
npm地址：https://www.npmjs.com/package/drag-arc
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| el | 放置组件的DOM元素 | Element | none | Y |
| change | 当前值变化时触发的事件，回调参数为当前进度值Number（0-100） | Function | ()=>{} | N |
| startDeg | 滑动圆弧的起始弧度 | Number (0-2) | 0 | N |
| endDeg | 滑动圆弧的结束弧度 | Number (0-2) | 1 | N |
| value | 默认值 | Number (0-100) | 0 | N |
| textShow | 显示文字 | Boolean | true | N |
| color | 外侧圆弧颜色 | String,Array | [“#06dabc”, “#33aaff”] | N |
| slider | 滑块半径 | Number | #FFF | N |
| innerColor | 内侧弧度的颜色 | String | #ccc | N |
| outColor | 外侧圆弧背景颜色 | String,Array | #ccc | N |
| innerLineWidth | 内侧弧线宽 | Number | 1 | N |
| outLineWidth | 外侧弧线宽 | Number | 20 | N |
| counterclockwise | 逆时针方向 | Boolean | true | N |
| sliderColor | 滑块颜色 | String | #CCC | N |
| sliderBorderColor | 滑块边框颜色 | String | #fff | N |
二、实现方法简介
1、绘制位置几何关系
如图所示，以canvas画布中心点建立坐标系，则有：
滑块位置与弧度关系：
由圆的参数方程得出
x=rcosφ
y=rsinφ
鼠标移动位置与弧度关系：
通过事件回调参数 我们可以获得 鼠标mousemove事件或者移动端touchmove事件的x,y坐标，可计算tan值为
tanφ = y/x;
再通过反三角函数有可得：
φ=arctan(tanφ)
以上基本的位置关系已经得出；
2、js实现中的几个问题
（1）坐标的转化方法
由于上述位置关系是基于中心坐标实现的，而canvas绘制坐标是以左上角为原点实现的，故需要实现两种坐标的转化关系；
（2）canvas弧度位置与正常弧度位置的转化
下图是canvas的弧度位置恰好与我们正常计算的方向是相反的，同样需考虑弧度的转换；
（3）Math.atan方法返回值与实际弧度的关系
由于Math.atan() 函数返回一个数值的反正切[- π/2 , π/2 ],
而实际中我们需要获得到[0-2π]直接的值，所以在通过鼠标位置获取弧度值时需要通过Math.atan(y/x)和xy在中心坐标的正负综合判断其所在象限从何获取实际的获取弧度值；
（4）弧度与进度条值得关系
由于鼠标移动触发绘图方法是较为连续的动画效果，而进度是间隔的，
这里我们需要实现个类似d3js中domain和range的比例关系。
这里我们将值[0,100]对应弧度比例为[startDeg, endDeg]
（5）终点的判断
由于鼠标移动的位置是任意的，可能导致滑块到达终点后由于鼠标移动到了起点时，滑块也直接从终点移动到起点，故需对起点终点做判断，到达起点后不可再向后滑动，到达终点后不可再向前滑动；
3、详细实现方法可以参考这篇文章