h5使用canvas画布实现手势解锁解锁canvas导出图片跨域的N种姿势小结html5 canvas手势解锁源码分享

 var width = $(document).width(); var height = $(document).height() - 40; //减去手机状态栏的高度 //九宫格其实就是九个点，9个点的坐标对象 var lockCicle = { x: 0, //x坐标 y: 0, //y坐标 color: "#999999", state: "1" //状态当前点是否已经被链接过 }; var offset = (width - height) / 2; //计算偏移量 var arr = []; //九个点的坐标数组 //计算九个点坐标的方法 for (var i = 1; i <= 3; i++) { //每一行 for (var j = 1; j <= 3; j++) { //每一行的每一个 var lockCicle = {}; //横屏 if (offset > 0) { lockCicle.x = (height / 4) * j + Math.abs(offset); lockCicle.y = (height / 4) * i; lockCicle.state = 0; //竖屏 } else { lockCicle.x = (width / 4) * j; lockCicle.y = (width / 4) * i + Math.abs(offset); lockCicle.state = 0; } arr.push(lockCicle); } } //初始化界面的方法 function init() { ctx.clearRect(0, 0, width, height); //清空画布 pointerArr = []; //清楚绘制路径 for (var i = 0; i < arr.length; i++) { arr[i].state = 0; //清除绘制状态 drawPointer(i); } } //绘制九宫格解锁界面 function drawPointer(i) { ctx.save(); var radius = 0; if (hastouch) { radius = width / 12; } else { radius = 24; } var _fillStyle = "#dd514c"; var _strokeStyle = "#dd514c"; //不同状态显示不同颜色 if (arr[i].state == 1) { _strokeStyle = "#1bd6c5"; } //绘制原点 ctx.beginPath(); ctx.fillStyle = _fillStyle; ctx.arc(arr[i].x, arr[i].y, 6, 0, Math.PI * 2, false); ctx.fill(); ctx.closePath(); //绘制圆圈 ctx.beginPath(); ctx.strokeStyle = _strokeStyle; ctx.lineWidth = 0.3; ctx.lineCap = "round"; ctx.lineJoin = "round"; ctx.arc(arr[i].x, arr[i].y, radius, 0, Math.PI * 2, false); ctx.stroke(); ctx.closePath(); ctx.restore(); } //初始化界面 init();

 var pointerArr = []; //连接线点的坐标数组 var startX, startY; //线条起始点 var puts = []; //经过的九个点的数组 var currentPointer; //当前点是否已经连接 var pwd = []; //密码 var confirmPwd = []; //确认密码 var unlockFlag = false; //是否解锁的标志 /** ** 绘制链接线的方法，将坐标数组中的点绘制在canvas画布中 **/ function drawLinePointer(x, y, flag) { ctx.clearRect(0, 0, width, height); ctx.save(); ctx.beginPath(); ctx.strokeStyle = "#1bd6c5"; ctx.lineWidth = 5; ctx.lineCap = "round"; ctx.lineJoin = "round"; for (var i = 0; i < pointerArr.length; i++) { if (i == 0) { ctx.moveTo(pointerArr[i].x, pointerArr[i].y); } else { ctx.lineTo(pointerArr[i].x, pointerArr[i].y); } } ctx.stroke(); ctx.closePath(); ctx.restore(); for (var i = 0; i < arr.length; i++) { drawPointer(i); //绘制圆圈和原点 if (ctx.isPointInPath(x, y) && currentPointer != i) { //判断鼠标点击是否在圆中 pointerArr.push({ x: arr[i].x, y: arr[i].y }); currentPointer = i; puts.push(i + 1); startX = arr[i].x; startY = arr[i].y; arr[i].state = 1; } } if (flag) { ctx.save(); ctx.beginPath(); ctx.globalCompositeOperation = "destination-over"; ctx.strokeStyle = "#e2e0e0"; ctx.lineWidth = 5; ctx.lineCap = "round"; ctx.lineJoin = "round"; ctx.moveTo(startX, startY); ctx.lineTo(x, y); ctx.stroke(); ctx.beginPath(); ctx.restore(); } }

 //兼容移动触摸的事件写法 var hastouch = "ontouchstart" in window ? true : false, tapstart = hastouch ? "touchstart" : "mousedown", tapmove = hastouch ? "touchmove" : "mousemove", tapend = hastouch ? "touchend" : "mouseup"; //绑定按下事件 lockCnavs.addEventListener(tapstart, function(e) { isMouseDown = true; var x1 = hastouch ? e.targetTouches[0].pageX : e.clientX - canvas.offsetLeft; var y1 = hastouch ? e.targetTouches[0].pageY : e.clientY - canvas.offsetTop; drawLinePointer(x1, y1, true); }); //移动时候，将经过的坐标点全部保存起来 lockCnavs.addEventListener(tapmove, function(e) { if (isMouseDown) { var x1 = hastouch ? e.targetTouches[0].pageX : e.clientX - canvas.offsetLeft; var y1 = hastouch ? e.targetTouches[0].pageY : e.clientY - canvas.offsetTop; drawLinePointer(x1, y1, true); } }); //取消 lockCnavs.addEventListener(tapend, function(e) { drawLinePointer(0, 0, false); isMouseDown = false; pointerArr = []; if (puts.length >= 6) { alert("你的图案密码是: [ " + puts.join(" > ") + " ]"); if (unlockFlag) { //解锁 unlock(); } else { //设置解锁密码 settingUnlockPwd(); } } else { if (puts.length >= 1) { alert("你的图案密码太简单了~~~"); init(); } } puts = []; });

 //设置解锁密码和解锁测试 function settingUnlockPwd() { if (pwd.length <= 0) { pwd = puts; init(); $("header").text("再次绘制解锁图案"); } else if (confirmPwd.length <= 0) { confirmPwd = puts; } console.log(pwd + " " + confirmPwd); //笔记两次密码是否正确 if (pwd.length > 0 && confirmPwd.length > 0) { if (compareArr(pwd, confirmPwd)) { $("header").text("解锁图案绘制成功"); init(); } else { $("header").text("两次绘制的解锁图案不一致"); init(); confirmPwd = []; } } } //解锁 function unlock() { console.log("解锁密码：" + puts + " " + confirmPwd); if (compareArr(puts, confirmPwd)) { $("header").text("解锁成功!页面跳转中......"); } else { $("header").text("解锁图案不正确！！！"); init(); } } $("footer").click(function() { if ($(this).text() === "解锁") { unlockFlag = true; init(); $("header").text("绘制解锁图案"); } }); //比较两个数组（Number）是否相等 function compareArr(arr1, arr2) { return arr1.toString() === arr2.toString(); }