本文实例为大家分享了小程序自定义圆形进度条的具体代码，供大家参考，具体内容如下
circle.wxss:
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page {
width: 100%;
height: 100%;
background-color: #fff;
}
.circle-box {
text-align: center;
margin-top: 10vw;
}
.circle {
position: absolute;
left: 0;
right: 0;
margin: auto;
}
.draw_btn {
width: 35vw;
position: absolute;
top: 33vw;
right: 0;
left: 0;
margin: auto;
border: 1px #000 solid;
border-radius: 5vw;
}
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circle.wxml:
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<view class="wrap">
<view class="circle-box">
<canvas class="circle" style="z-index: -99; width:200px; height:200px;" canvas-id="canvasCircle">
</canvas>
<canvas class="circle" style="width:200px; height:200px;" canvas-id="canvasArcCir">
</canvas>
<view class="draw_btn">
<view>80分</view>
<view>(满分100分)</view>
</view>
</view>
</view>
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circle.js:
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// pages/circle/circle.js
//获取应用实例
const app = getApp()
var ctx = wx.createCanvasContext('canvasArcCir');
Page({
/**
* 页面的初始数据
*/
data: {
},
drawCircle: function() {
function drawArc(s, e) {
ctx.setFillStyle('white');
ctx.clearRect(0, 0, 200, 200);
ctx.draw();
var x = 100,
y = 100,
radius = 96;
ctx.setLineWidth(5);
ctx.setStrokeStyle('#d81e06');
ctx.setLineCap('round');
ctx.beginPath();
//圆心的 x,y坐标,radius半径 s:起始弧度，单位弧度（在3点钟方向） e:终止弧度,:false弧度的方向是否是逆时针
ctx.arc(x, y, radius, s, e, false);
ctx.stroke()
ctx.draw()
}
var step = 70,
startAngle = 1.5 * Math.PI,
endAngle = 0,
n = 100,
endAngle = step * 2 * Math.PI / n + 1.5 * Math.PI;
drawArc(startAngle, endAngle);
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function(options) {
//调用画圆的方法
this.drawCircle()
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady: function() {
//创建并返回绘图上下文context对象。
var cxt_arc = wx.createCanvasContext('canvasCircle');
cxt_arc.setLineWidth(6);
cxt_arc.setStrokeStyle('#eaeaea');
cxt_arc.setLineCap('round');
cxt_arc.beginPath();
cxt_arc.arc(100, 100, 96, 0, 2 * Math.PI, false);
cxt_arc.stroke();
cxt_arc.draw();
},
})
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/wjswangjinsheng/article/details/102466828