其他不说, 上代码
(function() {
window.H5lock = function(obj) {
this.height = obj.height;
this.width = obj.width;
this.chooseType = Number(window.localStorage.getItem('chooseType')) || obj.chooseType;
};
function getDis(a, b) {
return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2));
};
H5lock.prototype.pickPoints = function(fromPt, toPt) {
var lineLength = 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 (getDis(pt, fromPt) + 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;
}
}
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++) {
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;
}
}
}
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" class="title">绘制解锁图案</h4>' + '<a id="updatePassword" style="position: absolute;right: 5px;top: 5px;color:#fff;font-size: 10px;display:none;">重置密码</a>' + '<canvas id="canvas" width="300" height="300" style="background-color: #305066;display: inline-block;margin-top: 15px;"></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();
});
}
})();
怎么用呢?
< !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="H5lock.js "></script>
<script type="text / javascript ">
new H5lock({
chooseType: 3
}).init();
</script>
</body>
</html>"
测试地址(PS:只支持移动端)
http://122.11.41.29/rzq/untitled2/index.html
实现方式指南
一个canvas标签搞定
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