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手勢密碼的h5實現參考

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"); //兩個圓之間的外距離 就是說兩個圓心的距離去除兩個半徑 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("密碼結果是:"+LinePoint.join("->")); LinePoint=[]; }, false); }