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[网页设计]HTML5实现屏幕手势解锁(转载)


来源:https://github.com/lvming6816077/H5lock
http://threejs.org/examples/
http://www.inf.usi.ch/phd/wettel/codecity-download.html (JSCity:把源码可视化成建筑物的 JS 库)
http://www.alloyteam.com/2015/07/html5-shi-xian-ping-mu-shou-shi-jie-suo/ (Web前端 腾讯AlloyTeam Blog )
http://top.jobbole.com/22960/(JSCity:把源码可视化成建筑物的 JS 库)

JS:

(function(){    window.H5lock = function(obj){      this.height = obj.height;      this.width = obj.width;      this.chooseType = Number(window.localStorage.getItem('chooseType')) || obj.chooseType;    };    H5lock.prototype.drawCle = function(x, y) { // 初始化解锁密码面板      this.ctx.strokeStyle = '#CFE6FF';      this.ctx.lineWidth = 2;      this.ctx.beginPath();      this.ctx.arc(x, y, this.r, 0, Math.PI * 2, true);      this.ctx.closePath();      this.ctx.stroke();    }    H5lock.prototype.drawPoint = function() { // 初始化圆心      for (var i = 0 ; i < this.lastPoint.length ; i++) {        this.ctx.fillStyle = '#CFE6FF';        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();      }    }    H5lock.prototype.drawStatusPoint = function(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();      }    }    H5lock.prototype.drawLine = function(po, lastPoint) {// 解锁轨迹      this.ctx.beginPath();      this.ctx.lineWidth = 3;      this.ctx.moveTo(this.lastPoint[0].x, this.lastPoint[0].y);      console.log(this.lastPoint.length);      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();    }    H5lock.prototype.createCircle = function() {// 创建解锁点的坐标,根据canvas的大小来平均分配半径      var n = this.chooseType;      var count = 0;      this.r = this.ctx.canvas.width / (2 + 4 * n);// 公式计算      this.lastPoint = [];      this.arr = [];      this.restPoint = [];      var r = this.r;      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);        }      }      this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.height);      for (var i = 0 ; i < this.arr.length ; i++) {        this.drawCle(this.arr[i].x, this.arr[i].y);      }      //return arr;    }    H5lock.prototype.getPosition = function(e) {// 获取touch点相对于canvas的坐标      var rect = e.currentTarget.getBoundingClientRect();      var po = {        x: e.touches[0].clientX - rect.left,        y: e.touches[0].clientY - rect.top       };      return po;    }    H5lock.prototype.update = function(po) {// 核心变换方法在touchmove时候调用      this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.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);// 每帧花轨迹      this.drawLine(po , this.lastPoint);// 每帧画圆心      for (var i = 0 ; i < this.restPoint.length ; i++) {        if (Math.abs(po.x - this.restPoint[i].x) < this.r && Math.abs(po.y - this.restPoint[i].y) < this.r) {          this.drawPoint(this.restPoint[i].x, this.restPoint[i].y);          this.lastPoint.push(this.restPoint[i]);          this.restPoint.splice(i, 1);          break;        }      }    }    H5lock.prototype.checkPass = function(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;    }    H5lock.prototype.storePass = function(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;          document.getElementById('title').innerHTML = '密码保存成功';          this.drawStatusPoint('#2CFF26');          window.localStorage.setItem('passwordxx', JSON.stringify(this.pswObj.spassword));          window.localStorage.setItem('chooseType', this.chooseType);        } else {          document.getElementById('title').innerHTML = '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)) {          document.getElementById('title').innerHTML = '解锁成功';          this.drawStatusPoint('#2CFF26');        } else {          this.drawStatusPoint('red');          document.getElementById('title').innerHTML = '解锁失败';        }      } else {        this.pswObj.step = 1;        this.pswObj.fpassword = psw;        document.getElementById('title').innerHTML = '再次输入';      }    }    H5lock.prototype.makeState = function() {      if (this.pswObj.step == 2) {        document.getElementById('updatePassword').style.display = 'block';        //document.getElementById('chooseType').style.display = 'none';        document.getElementById('title').innerHTML = '请解锁';      } else if (this.pswObj.step == 1) {        //document.getElementById('chooseType').style.display = 'none';        document.getElementById('updatePassword').style.display = 'none';      } else {        document.getElementById('updatePassword').style.display = 'none';        //document.getElementById('chooseType').style.display = 'block';      }    }    H5lock.prototype.setChooseType = function(type){      chooseType = type;      init();    }    H5lock.prototype.updatePassword = function(){      window.localStorage.removeItem('passwordxx');      window.localStorage.removeItem('chooseType');      this.pswObj = {};      document.getElementById('title').innerHTML = '绘制解锁图案';      this.reset();    }    H5lock.prototype.initDom = function(){      var wrap = document.createElement('div');      var str = '<h4 id="title" >绘制解锁图案</h4>'+           '<a id="updatePassword" >重置密码</a>'+           '<canvas id="canvas" width="300" height="300" ></canvas>';      wrap.setAttribute('style','position: absolute;top:0;left:0;right:0;bottom:0;');      wrap.innerHTML = str;      document.body.appendChild(wrap);    }    H5lock.prototype.init = function() {      this.initDom();      this.pswObj = window.localStorage.getItem('passwordxx') ? {        step: 2,        spassword: JSON.parse(window.localStorage.getItem('passwordxx'))      } : {};      this.lastPoint = [];      this.makeState();      this.touchFlag = false;      this.canvas = document.getElementById('canvas');      this.ctx = this.canvas.getContext('2d');      this.createCircle();      this.bindEvent();    }    H5lock.prototype.reset = function() {      this.makeState();      this.createCircle();    }    H5lock.prototype.bindEvent = function() {      var self = this;      this.canvas.addEventListener("touchstart", function (e) {        e.preventDefault();// 某些android 的 touchmove不宜触发 所以增加此行代码         var po = self.getPosition(e);         console.log(po);         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;          }         }       }, false);       this.canvas.addEventListener("touchmove", function (e) {        if (self.touchFlag) {          self.update(self.getPosition(e));        }       }, false);       this.canvas.addEventListener("touchend", function (e) {         if (self.touchFlag) {           self.touchFlag = false;           self.storePass(self.lastPoint);           setTimeout(function(){            self.reset();          }, 300);         }       }, false);       document.addEventListener('touchmove', function(e){        e.preventDefault();       },false);       document.getElementById('updatePassword').addEventListener('click', function(){         self.updatePassword();       });    }})();

  HTML5:

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">  <title>H5lock</title>  <style type="text/css">    body {      text-align: center;      background-color: #305066;    }    .title {      color: #22C3AA;    }  </style>    </head><body><script type="text/javascript" src="javascripts/H5lock.js"></script><script type="text/javascript">//http://www.nihaoshijie.com.cn/index.php/archives/537http://www.nihaoshijie.com.cn/index.php/archives/537 /* http://top.jobbole.com/22960/ http://threejs.org/examples/http://www.inf.usi.ch/phd/wettel/codecity-download.htmlhttps://github.com/lvming6816077/H5lockhttp://www.alloyteam.com/2015/07/html5-shi-xian-ping-mu-shou-shi-jie-suo/ */new H5lock({  chooseType: 3}).init();</script></body></html>