HTML5实现手势屏幕解锁

| 1035次阅读| 作者:html,css
摘要:实现原理   利用HTML5的canvas,将解锁的圈圈划出,利用touch事件解锁这些圈圈,直接看代码
效果展示


实现原理
利用HTML5的canvas,将解锁的圈圈划出,利用touch事件解锁这些圈圈,直接看代码。

js代码
01function createCircle() {
02// 创建解锁点的坐标,根据canvas的大小来平均分配半径
03var n = chooseType;// 画出n*n的矩阵
04lastPoint = [];
05arr = [];
06restPoint = [];
07r = ctx.canvas.width / (2 + 4 * n);// 公式计算 半径和canvas的大小有关
08for (var i = 0 ; i < n ; i++) {
09   for (var j = 0 ; j < n ; j++) {
10arr.push({
11   x: j * 4 * r + 3 * r,
12   y: i * 4 * r + 3 * r
13});
14restPoint.push({
15   x: j * 4 * r + 3 * r,
16   y: i * 4 * r + 3 * r
17});
18   }
19}
20//return arr;
21}
canvas里的圆圈画好之后可以进行事件绑定

js代码
01function bindEvent() {
02        can.addEventListener("touchstart", function (e) {
03             var po = getPosition(e);
04             console.log(po);
05             for (var i = 0 ; i < arr.length ; i++) {
06                if (Math.abs(po.x - arr[i].x) < r && Math.abs(po.y - arr[i].y) < r) { // 用来判断起始点是否在圈圈内部
07                    touchFlag = true;
08                    drawPoint(arr[i].x,arr[i].y);
09                    lastPoint.push(arr[i]);
10                    restPoint.splice(i,1);
11                    break;
12                }
13             }
14         }, false);
15         can.addEventListener("touchmove", function (e) {
16            if (touchFlag) {
17                update(getPosition(e));
18            }
19         }, false);
20         can.addEventListener("touchend", function (e) {
21             if (touchFlag) {
22                 touchFlag = false;
23                 storePass(lastPoint);
24                 setTimeout(function(){
25                    init();
26                }, 300);
27             }
28         }, false);
29}
接着到了最关键的步骤绘制解锁路径逻辑,通过touchmove事件的不断触发,调用canvas的moveTo方法和lineTo方法来画出折现,同时判断是否达到我们所画的圈圈里面,其中lastPoint保存正确的圈圈路径,restPoint保存全部圈圈去除正确路径之后剩余的。 Update方法:

js代码
01function update(po) {// 核心变换方法在touchmove时候调用
02        ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
03        for (var i = 0 ; i < arr.length ; i++) { // 每帧先把面板画出来
04            drawCle(arr[i].x, arr[i].y);
05        }
06        drawPoint(lastPoint);// 每帧花轨迹
07        drawLine(po , lastPoint);// 每帧画圆心
08        for (var i = 0 ; i < restPoint.length ; i++) {
09            if (Math.abs(po.x - restPoint[i].x) < r && Math.abs(po.y - restPoint[i].y) < r) {
10                drawPoint(restPoint[i].x, restPoint[i].y);
11                lastPoint.push(restPoint[i]);
12                restPoint.splice(i, 1);
13                break;
14            }
15        }
16}
最后就是收尾工作,把路径里面的lastPoint保存的数组变成密码存在localstorage里面,之后就用来处理解锁验证逻辑了。

js代码
01function storePass(psw) {// touchend结束之后对密码和状态的处理
02        if (pswObj.step == 1) {
03            if (checkPass(pswObj.fpassword, psw)) {
04                pswObj.step = 2;
05                pswObj.spassword = psw;
06                document.getElementById('title').innerHTML = '密码保存成功';
07                drawStatusPoint('#2CFF26');
08                window.localStorage.setItem('passwordx', JSON.stringify(pswObj.spassword));
09                window.localStorage.setItem('chooseType', chooseType);
10            } else {
11                document.getElementById('title').innerHTML = '两次不一致,重新输入';
12                drawStatusPoint('red');
13                delete pswObj.step;
14            }
15        } else if (pswObj.step == 2) {
16            if (checkPass(pswObj.spassword, psw)) {
17                document.getElementById('title').innerHTML = '解锁成功';
18                drawStatusPoint('#2CFF26');
19            } else {
20                drawStatusPoint('red');
21                document.getElementById('title').innerHTML = '解锁失败';
22            }
23        } else {
24            pswObj.step = 1;
25            pswObj.fpassword = psw;
26            document.getElementById('title').innerHTML = '再次输入';
27        }
28}
解锁组件

将这个HTML5解锁写成了一个组件,放在

https://github.com/lvming6816077/H5lock

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