微信小程序 ---- 组件应用和实际开发的DEMO

var Locker = class { constructor(page,opt){ var obj = opt || {}; this.page = page; this.width = obj.width || 300; this.height = obj.height || 300; this.canvasId = obj.id || 'canvas'; this.cleColor = obj.cleColor || '#CFE6FF'; this.cleCenterColor = obj.cleCenterColor || '#CFE6FF'; var chooseType = obj.chooseType || 3; // 判断是否缓存有chooseType，有就用缓存，没有就用传入的值 this.chooseType = Number(wx.getStorageSync('chooseType')) || chooseType; this.init(); } init(){ this.pswObj = wx.getStorageSync('passwordxx') ? { step: 2, spassword: JSON.parse(wx.getStorageSync('passwordxx')) } : {}; this.makeState(); // 创建 canvas 绘图上下文（指定 canvasId） this.ctx = wx.createCanvasContext(this.canvasId,this); this.touchFlag = false; this.lastPoint = []; // 绘制圆 this.createCircle(); // canvas绑定事件 this.bindEvent(); } makeState() { if (this.pswObj.step == 2) { this.page.setData({ title:'请解锁'}); } else if (this.pswObj.step == 1) { // pass } else { // pass } } // 画圆方法 drawCle(x,y){ // 设置边框颜色。 this.ctx.setStrokeStyle(this.cleColor); // 注意用set // 设置线条的宽度。 this.ctx.setLineWidth(2); // 注意用set // 开始创建一个路径，需要调用fill或者stroke才会使用路径进行填充或描边。 this.ctx.beginPath(); // 画一条弧线。 this.ctx.arc(x, y, this.r, 0, Math.PI * 2, true); // 关闭一个路径 this.ctx.closePath(); // 画出当前路径的边框。默认颜色色为黑色。 this.ctx.stroke(); // 将之前在绘图上下文中的描述（路径、变形、样式）画到 canvas 中。 this.ctx.draw(true); } // 计算两点之间的距离的方法 getDis(a, b) { return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2)); } // 创建解锁点的坐标，根据canvas的大小（默认300px）来平均分配半径 createCircle() { var n = this.chooseType; var count = 0; // 计算圆半径 this.r = this.width / (2 + 4 * n); this.arr = []; this.restPoint = []; var r = this.r; // 获取圆心坐标，以及当前圆所代表的数 for (var i = 0; i < n; i++) { for (var j = 0; j < n; j++) { count++; var obj = { x: j * 4 * r + 3 * r, y: i * 4 * r + 3 * r, index: count }; this.arr.push(obj); this.restPoint.push(obj); } } // 清空画布 this.ctx.clearRect(0, 0, this.width, this.height); // 绘制所有的圆 this.arr.forEach(current => {this.drawCle(current.x, current.y);}); } // 设置密码绘制 getPosition(e) { // 获取touch点相对于canvas的坐标 var po = { x: e.touches[0].x, y: e.touches[0].y }; return po; } precisePosition(po){ var arr = this.restPoint.filter(current => Math.abs(po.x - current.x) < this.r && Math.abs(po.y - current.y) < this.r); return arr[0]; } drawPoint(obj) { // 初始化圆心 for (var i = 0; i < this.lastPoint.length; i++) { this.ctx.setFillStyle(this.cleCenterColor); // 注意用set方法 this.ctx.beginPath(); this.ctx.arc(this.lastPoint[i].x, this.lastPoint[i].y, this.r / 2, 0, Math.PI * 2, true); this.ctx.closePath(); this.ctx.fill(); this.ctx.draw(true); } } drawLine(po) {// 解锁轨迹 this.ctx.beginPath(); this.ctx.lineWidth = 3; this.ctx.moveTo(this.lastPoint[0].x,this.lastPoint[0].y); for (var i = 1; i < this.lastPoint.length; i++) { this.ctx.lineTo(this.lastPoint[i].x, this.lastPoint[i].y); } this.ctx.lineTo(po.x, po.y); this.ctx.stroke(); this.ctx.closePath(); this.ctx.draw(true); } pickPoints(fromPt, toPt) { var lineLength = this.getDis(fromPt, toPt); var dir = toPt.index > fromPt.index ? 1 : -1; var len = this.restPoint.length; var i = dir === 1 ? 0 : (len - 1); var limit = dir === 1 ? len : -1; while (i !== limit) { var pt = this.restPoint[i]; if (this.getDis(pt, fromPt) + this.getDis(pt, toPt) === lineLength) { this.drawPoint(pt.x, pt.y); this.lastPoint.push(pt); this.restPoint.splice(i, 1); if (limit > 0) { i--; limit--; } } i += dir; } } update(po) {// 核心变换方法在touchmove时候调用 this.ctx.clearRect(0, 0, this.width, this.height); for (var i = 0; i < this.arr.length; i++) { // 每帧先把面板画出来 this.drawCle(this.arr[i].x, this.arr[i].y); } this.drawPoint(this.lastPoint); this.drawLine(po, this.lastPoint); for (var i = 0; i < this.restPoint.length; i++) { var pt = this.restPoint[i]; if (Math.abs(po.x - pt.x) < this.r && Math.abs(po.y - pt.y) < this.r) { this.drawPoint(pt.x, pt.y); this.pickPoints(this.lastPoint[this.lastPoint.length - 1], pt); break; } } } checkPass(psw1, psw2) {// 检测密码 var p1 = '', p2 = ''; for (var i = 0; i < psw1.length; i++) { p1 += psw1[i].index + psw1[i].index; } for (var i = 0; i < psw2.length; i++) { p2 += psw2[i].index + psw2[i].index; } return p1 === p2; } storePass(psw) {// touchend结束之后对密码和状态的处理 if (this.pswObj.step == 1) { if (this.checkPass(this.pswObj.fpassword, psw)) { this.pswObj.step = 2; this.pswObj.spassword = psw; this.page.setData({title:'密码保存成功'}); this.drawStatusPoint('#2CFF26'); wx.setStorageSync('passwordxx', JSON.stringify(this.pswObj.spassword)); wx.setStorageSync('chooseType', this.chooseType); } else { this.page.setData({ title: '两次不一致，重新输入' }); this.drawStatusPoint('red'); delete this.pswObj.step; } } else if (this.pswObj.step == 2) { if (this.checkPass(this.pswObj.spassword, psw)) { this.page.setData({ title: '解锁成功' }); this.drawStatusPoint('#2CFF26'); } else { this.drawStatusPoint('red'); this.page.setData({ title: '解锁失败' }); } } else { this.pswObj.step = 1; this.pswObj.fpassword = psw; this.page.setData({ title: '再次输入' }); } } drawStatusPoint(type) { // 初始化状态线条 for (var i = 0; i < this.lastPoint.length; i++) { this.ctx.strokeStyle = type; this.ctx.beginPath(); this.ctx.arc(this.lastPoint[i].x, this.lastPoint[i].y, this.r, 0, Math.PI * 2, true); this.ctx.closePath(); this.ctx.stroke(); this.ctx.draw(true); } } updatePassword() { wx.removeStorageSync('passwordxx'); wx.removeStorageSync('chooseType'); this.pswObj = {}; this.page.setData({ title: '绘制解锁图案' }); this.reset(); } reset() { this.makeState(); this.createCircle(); } bindEvent(){ var self = this; this.page.onTouchStart = function(e){ var po = self.getPosition(e); self.lastPoint = []; for (var i = 0; i < self.arr.length; i++) { if (Math.abs(po.x - self.arr[i].x) < self.r && Math.abs(po.y - self.arr[i].y) < self.r) { self.touchFlag = true; self.drawPoint(self.arr[i].x, self.arr[i].y); self.lastPoint.push(self.arr[i]); self.restPoint.splice(i, 1); break; } } } this.page.onTouchMove = function(e){ if (self.touchFlag) { self.update(self.getPosition(e)); } } thi