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; }
circle.wxml:
<view> <view> <canvas canvas-id="canvasCircle"> </canvas> <canvas canvas-id="canvasArcCir"> </canvas> <view> <view>80分</view> <view>(满分100分)</view> </view> </view> </view>
circle.js:
// 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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