HTML5 Canvas简简单单实现手机九宫格手势密码解锁

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HTML5 Canvas简简单单实现手机九宫格手势密码解锁

2024-08-06 02:59:47 217人阅读

早上花了一个半小时写了一个基于HTML Canvas的手势解锁，主要是为了好玩，可能以后会用到。

思路：根据配置计算出九个点的位置，存入一个数组，当然存入数组的顺序的索引是：

　　　第一行：0 1 2 　　第二行：3 4 5 　　第三行：6 7 8

然后就根据这个坐标数组去绘制九个点

再则我们需要一个保存选中点的数组，每当touchmove事件就判断当前触摸点和那个点的距离小于圆的半径

　　如果为真的话那么就添加进入选中点的数组

　　在绘制过程中就根据该数据去绘制线条。就这么简单

上代码：（需要chrome浏览器或者火狐浏览器模拟手机状态才有触摸效果）

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<!DOCTYPE html><html><head lang="en">    <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"          name="viewport"/>    <meta charset="UTF-8">    <title></title>    <style type="text/css">        html, body {            margin: 0;            padding: 0;            width: 100%;            height: 100%;        }    </style>    <script type="text/javascript">        var R = 26, CW = 400, CH = 320, OffsetX = 30, OffsetY = 30;        function CaculateNinePointLotion(diffX, diffY) {            var Re = [];            for (var row = 0; row < 3; row++) {                for (var col = 0; col < 3; col++) {                    var Point = {                        X: (OffsetX + col * diffX + ( col * 2 + 1) * R),                        Y: (OffsetY + row * diffY + (row * 2 + 1) * R)                    };                    Re.push(Point);                }            }            return Re;        }        var PointLocationArr = [];        window.onload = function () {            var c = document.getElementById("myCanvas");            CW = document.body.offsetWidth;            c.width = CW;            c.height = CH;            var cxt = c.getContext("2d");            //两个圆之间的外距离 就是说两个圆心的距离去除两个半径            var X = (CW - 2 * OffsetX - R * 2 * 3) / 2;            var Y = (CH - 2 * OffsetY - R * 2 * 3) / 2;            PointLocationArr = CaculateNinePointLotion(X, Y);            InitEvent(c, cxt);            //CW=2*offsetX+R*2*3+2*X            Draw(cxt, PointLocationArr, [],null);        }        function Draw(cxt, _PointLocationArr, _LinePointArr,touchPoint) {            if (_LinePointArr.length > 0) {                cxt.beginPath();                for (var i = 0; i < _LinePointArr.length; i++) {                    var pointIndex = _LinePointArr[i];                    cxt.lineTo(_PointLocationArr[pointIndex].X, _PointLocationArr[pointIndex].Y);                }                cxt.lineWidth = 10;                cxt.strokeStyle = "#627eed";                cxt.stroke();                cxt.closePath();                if(touchPoint!=null)                {                    var lastPointIndex=_LinePointArr[_LinePointArr.length-1];                    var lastPoint=_PointLocationArr[lastPointIndex];                    cxt.beginPath();                    cxt.moveTo(lastPoint.X,lastPoint.Y);                    cxt.lineTo(touchPoint.X,touchPoint.Y);                    cxt.stroke();                    cxt.closePath();                }            }            for (var i = 0; i < _PointLocationArr.length; i++) {                var Point = _PointLocationArr[i];                cxt.fillStyle = "#627eed";                cxt.beginPath();                cxt.arc(Point.X, Point.Y, R, 0, Math.PI * 2, true);                cxt.closePath();                cxt.fill();                cxt.fillStyle = "#ffffff";                cxt.beginPath();                cxt.arc(Point.X, Point.Y, R - 3, 0, Math.PI * 2, true);                cxt.closePath();                cxt.fill();                if(_LinePointArr.indexOf(i)>=0)                {                    cxt.fillStyle = "#627eed";                    cxt.beginPath();                    cxt.arc(Point.X, Point.Y, R -16, 0, Math.PI * 2, true);                    cxt.closePath();                    cxt.fill();                }            }        }        function IsPointSelect(touches,LinePoint)        {            for (var i = 0; i < PointLocationArr.length; i++) {                var currentPoint = PointLocationArr[i];                var xdiff = Math.abs(currentPoint.X - touches.pageX);                var ydiff = Math.abs(currentPoint.Y - touches.pageY);                var dir = Math.pow((xdiff * xdiff + ydiff * ydiff), 0.5);                if (dir < R ) {                    if(LinePoint.indexOf(i) < 0){ LinePoint.push(i);}                    break;                }            }        }        function InitEvent(canvasContainer, cxt) {            var LinePoint = [];            canvasContainer.addEventListener("touchstart", function (e) {                IsPointSelect(e.touches[0],LinePoint);            }, false);            canvasContainer.addEventListener("touchmove", function (e) {                e.preventDefault();                var touches = e.touches[0];                IsPointSelect(touches,LinePoint);                cxt.clearRect(0,0,CW,CH);                Draw(cxt,PointLocationArr,LinePoint,{X:touches.pageX,Y:touches.pageY});            }, false);            canvasContainer.addEventListener("touchend", function (e) {                cxt.clearRect(0,0,CW,CH);                Draw(cxt,PointLocationArr,LinePoint,null);                alert("密码结果是："+LinePoint.join("->"));                LinePoint=[];            }, false);        }    </script></head><body><canvas id="myCanvas"></canvas></body></html>

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HTML5 Canvas简简单单实现手机九宫格手势密码解锁

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首页 > 代码库 > HTML5 Canvas简简单单实现手机九宫格手势密码解锁

HTML5 Canvas简简单单实现手机九宫格手势密码解锁

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