本文实例为大家分享了微信小程序绘制半圆进度条的具体代码，供大家参考，具体内容如下
wxml：
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<view class="progress"> <canvas canvas-id="canvasProgress" style="width: {{canvasWidth}}rpx; height: {{canvasHeitht}}rpx;"></canvas> </view> <view class="progress"> <canvas canvas-id="canvasProgressReal" style="width: {{canvasWidth}}rpx; height: {{canvasHeitht}}rpx;"></canvas></view> |
js：
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Page({ /** * 页面的初始数据 */ data: { canvasWidth: 500, canvasHeitht: 300, radioPos: 98, footNum: 0, footNumAll: 6000, myTargetFoot: 10000, degree: 195, timer: '', timerNum: '', }, /** * 生命周期函数--监听页面加载 */ onLoad: function(options) { var that = this; let widthPX = wx.getSystemInfoSync().windowWidth; let r = this.data.radioPos = widthPX * (500 / 750) * (300 / 365) * (2 / 4) var context = wx.createCanvasContext('canvasProgress') context.translate(24, 6); context.setStrokeStyle("#fff"); context.setLineWidth(2); context.beginPath(); for (let i = 195; i >= -15; i--) { //每1度绘制一条线 let degree = i / 360 * Math.PI * 2 let radio = r * 0.92 - r * 0.005 * (210 - i) / 240 context.moveTo(r + radio * Math.cos(degree), r - radio * Math.sin(degree)); //向量加减 context.lineTo(r + r * Math.cos(degree), r - r * Math.sin(degree)); //向量加减 context.stroke(); } context.draw(); }, /** * 生命周期函数--监听页面初次渲染完成 */ onReady: function() { }, /** * 生命周期函数--监听页面显示 */ onShow: function() { let that = this //清理 var context = wx.createCanvasContext('canvasProgressReal') context.clearRect(0, 0, this.data.canvasWidth, this.data.canvasHeitht) context.draw({ reserve: true }) that.walkAction() }, /** * 生命周期函数--监听页面隐藏 */ onHide: function() { }, /** * 生命周期函数--监听页面卸载 */ onUnload: function() { }, /** * 页面相关事件处理函数--监听用户下拉动作 */ onPullDownRefresh: function() { }, /** * 页面上拉触底事件的处理函数 */ onReachBottom: function() { }, /** * 用户点击右上角分享 */ onShareAppMessage: function() { }, walkAction: function() { console.log('walk') this.setData({ degree: 195 }) let that = this let r = this.data.radioPos let widthPX = wx.getSystemInfoSync().windowWidth; var context = wx.createCanvasContext('canvasProgressReal') context.clearRect(0, 0, this.data.canvasWidth, this.data.canvasHeitht) context.setStrokeStyle("#FDD08F"); context.translate(24, 6); context.setLineWidth(2); let degreeMax = 195 - (this.data.footNumAll / this.data.myTargetFoot) * 240; if (Number.parseInt(this.data.footNumAll) >= Number.parseInt(this.data.myTargetFoot)) { console.log('footNumAll is smaller than myTargetFoot') degreeMax = -33 } this.timer = setInterval(() => { if (that.data.degree > degreeMax) { context.beginPath(); let degreeOne = that.data.degree / 360 * Math.PI * 2 let radio = r * 0.92 - r * 0.005 * (195 - that.data.degree) / 240 context.moveTo(r + radio * Math.cos(degreeOne), r - radio * Math.sin(degreeOne)); context.lineTo(r + r * Math.cos(degreeOne), r - r * Math.sin(degreeOne)); context.stroke(); // context.draw({ // reserve: true // })//这个方法真机上绘制有问题 wx.drawCanvas({ canvasId: 'canvasProgressReal', actions: context.getActions(), reserve: true }) // that.data.degree -= 3; that.data.degree--; } else { clearInterval(that.timer) } // }, 50) }, 10) let tempTimes = 0; let times = (this.data.footNumAll / this.data.myTargetFoot) * 240 / 3; if (Number.parseInt(this.data.footNumAll) >= Number.parseInt(this.data.myTargetFoot)) { times = 80 } let step = this.data.footNumAll / times this.timerNum = setInterval(() => { if (tempTimes < times) { that.setData({ footNum: Math.floor(that.data.footNum + step) }) tempTimes += 1; } else { that.setData({ footNum: that.data.footNumAll }) clearInterval(that.timerNum) } // }, 50) }, 10) },}) |
wxss：
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.progress { z-index: 1; width: 100%; height: 100%; position: absolute; left: 0; top: 0; display: flex !important; align-items: center; justify-content: center;}.progress canvas { width: 100%; height: 100%;} |
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/Dilemma_me/article/details/103614023
