WeChat mini program to create a custom circular progress bar

The article mainly introduces the detailed explanation of WeChat applet-custom circular Progress bar, which has certain reference value. The implementation idea is to first draw the bottom gray circle background, and then draw the upper blue progress strip.

JSCode:

Page({
 data: {},
 onLoad: function (options) {
  // 页面初始化 options为页面跳转所带来的参数
 },
 onReady: function () {
  
  // 页面渲染完成
  var cxt_arc = wx.createCanvasContext('canvasArc');//创建并返回绘图上下文context对象。
  cxt_arc.setLineWidth(6);
  cxt_arc.setStrokeStyle('#d2d2d2');
  cxt_arc.setLineCap('round')
  cxt_arc.beginPath();//开始一个新的路径
  cxt_arc.arc(106, 106, 100, 0, 2*Math.PI, false);//设置一个原点(106,106)，半径为100的圆的路径到当前路径
  cxt_arc.stroke();//对当前路径进行描边
    
  cxt_arc.setLineWidth(6);
  cxt_arc.setStrokeStyle('#3ea6ff');
  cxt_arc.setLineCap('round')
  cxt_arc.beginPath();//开始一个新的路径
  cxt_arc.arc(106, 106, 100, -Math.PI * 1 / 2, Math.PI*6/5, false);
  cxt_arc.stroke();//对当前路径进行描边
  
  cxt_arc.draw();
    
 },
 onShow: function () {
  // 页面显示
 },
 onHide: function () {
  // 页面隐藏
 },
 onUnload: function () {
  // 页面关闭
 }
})

Page layout:

<view class="wrap">
 <view class="top">
  <canvas class="cir" style="width:212px; height:212px;" canvas-id="canvasArc">
  </canvas>
  
  <view class="cc">中间</view>
  
 </view>
</view>

CSS style:

.cir{
 display: inline-block;
 margin-top: 20rpx;
  
}
  
.top{
 text-align: center
}
  
.cc{
   
 margin-top: -120px;
   
}

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