canvas手势解锁源码
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2022-08-08 18:49:30
先放图 demo.html
先放图
demo.html
<!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>手势解锁</title>
<style type="text/css">
body{
text-align: center;
background: #305066;
}
h4{
color: #22c3aa;
}
</style>
</head>
<body>
<script type="text/javascript" src="src/index.js"></script>
<script type="text/javascript">
// 1、生成背景
// 2、title生成
// 3、用js动态生成canvas标签
// 4、js方式动态生成h4标签和canvas标签
new canvaslock({choosetype:3}).init();
</script>
</body>
</html>
index.js
(function(){
/**
* 实现画圆和划线：
* 1、添加事件touchstart、touchmove、touchend
* 2、touchstart判断是否点击的位置处于圆内getposition，处于则初始化
* lastpoint、restpoint
* 3、touchmove做的就是：画圆drawpoint和画线drawline
*
* 实现自动画圆的效果
* 1、检测手势移动的位置是否处于圆内
* 2、圆内的话则画圆 drawpoint
* 3、已经画过实心圆的圆，无需重复检测
*
* 实现解锁成功：
* 1、检测路径是否是对的
* 2、如果是对的就重置，圆圈变绿
* 3、不对也重置，圆圈变红
* 4、重置
*/
window.canvaslock = function(obj){
this.height = obj.height;
this.width = obj.width;
this.choosetype = obj.choosetype;
};
// js方式动态生成dom
canvaslock.prototype.initdom = function(){
var wrap = document.createelement('div');
var str = '<h4 id="title" class="title">绘制解锁图案</h4>';
wrap.setattribute('style','position: absolute;top:0;left:0;right:0;bottom:0;');
var canvas = document.createelement('canvas');
canvas.setattribute('id','canvas');
canvas.style.csstext = 'background-color: #305066;display: inline-block;margin-top: 15px;';
wrap.innerhtml = str;
wrap.appendchild(canvas);
var width = this.width || 300;
var height = this.height || 300;
document.body.appendchild(wrap);
// 高清屏锁放
canvas.style.width = width + "px";
canvas.style.height = height + "px";
canvas.width = width;
canvas.height = height;
}
canvaslock.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();
}
canvaslock.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++) {
// 画圆函数
this.drawcle(this.arr[i].x, this.arr[i].y);
}
//return arr;
}
// 程序初始化
canvaslock.prototype.init = function() {
this.initdom();
this.canvas = document.getelementbyid('canvas');
this.ctx = this.canvas.getcontext('2d');
this.touchflag = false;
// 1、确定半径
// 2、确定每一个圆的中心坐标点
// 3、一行3个圆14个半径，一行4个圆有18个半径
this.createcircle();
this.bindevent();
}
canvaslock.prototype.bindevent = function(){
var self = this;
this.canvas.addeventlistener("touchstart", function (e) {
// 2、touchstart判断是否点击的位置处于圆内getposition，处于则初始化
// * lastpoint、restpoint
// po有x和y，并且是相较于canvas边距
var po = self.getposition(e);
console.log(po.x)
// 判断是否在圆内的原理：多出来的这条 x/y < r 在圆内
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;
// lastpoint存放的就是选中的圆圈的x/y坐标值
self.lastpoint.push(self.arr[i]);
self.restpoint.splice(i,1);
break;
}
}
}, false);
this.canvas.addeventlistener("touchmove", function (e) {
// touchmove做的就是：画圆drawpoint和划线drawline
if (self.touchflag) {
self.update(self.getposition(e));
}
}, false);
this.canvas.addeventlistener("touchend", function(e){
if (self.touchflag) {
self.storepass(self.lastpoint);
settimeout(function(){
self.reset();
}, 300);
}
}, false);
}
canvaslock.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;
}
canvaslock.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);
// 重新画9个圆圈
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();// 画圆
this.drawline(po);// 画线
// 1、检测手势移动的位置是否处于下一个圆内
// 2、圆内的话则画圆 drawpoint
// 3、已经画过实心圆的圆，无需重复检测
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.lastpoint.push(this.restpoint[i]);
this.restpoint.splice(i, 1);
break;
}
}
console.log(this.lastpoint)
}
canvaslock.prototype.drawline = function(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();
}
canvaslock.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();
}
}
// 1、检测路径是否是对的
// 2、如果是对的就重置，圆圈变绿
// 3、不对也重置，圆圈变红
// 4、重置
canvaslock.prototype.storepass = function() {
if (this.checkpass()) {
document.getelementbyid('title').innerhtml = '解锁成功';
this.drawstatuspoint('#2cff26');
}else{
document.getelementbyid('title').innerhtml = '解锁失败';
this.drawstatuspoint('red');
}
}
canvaslock.prototype.checkpass = function() {
var p1 = '123',
p2 = '';
for (var i = 0 ; i < this.lastpoint.length ; i++) {
p2 += this.lastpoint[i].index;
}
return p1 === p2;
}
canvaslock.prototype.drawstatuspoint = function(type) {
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();
}
}
canvaslock.prototype.reset = function(){
this.createcircle();
}
})();