微信小程序绘制半圆(弧形)进度条
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这篇文章主要为大家详细介绍了微信小程序绘制半圆(弧形)进度条,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
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
<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
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
.progress { z-index: 1; width: 100%; height: 100%; position: absolute; left: 0; : 0; display: flex !important; align-items: center; justify-content: center; } .progress canvas { width: 100%; height: 100%; }
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