HTML5真的是很强大,前端时间看到一个canvas实现九宫格的密码解锁。今天抽出时间模仿了一个,特定分享一下!
效果截图如下:
效果看起来还不错吧!
源码如下:
<!DOCTYPE html> <html> <head lang="zh-CN"> <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"/> <meta charset="UTF-8"> <title>html5实现网页解锁功能</title> <style type="text/css"> html, body { margin: 0; padding: 0; width: 100%; height: 100%; } </style> <script type="text/javascript"> /** * 半径,画布宽度,画布高度,画布x内边距,画布y内边距 */ var R = 26, canvasWidth = 400, canvasHeight = 320, OffsetX = 30, OffsetY = 30; var circleArr = []; function createCirclePoint(diffX, diffY) { for (var row = 0; row < 3; row++) { for (var col = 0; col < 3; col++) { // 计算圆心坐标 var Point = { X: (OffsetX + col * diffX + ( col * 2 + 1) * R), Y: (OffsetY + row * diffY + (row * 2 + 1) * R) }; circleArr.push(Point); } } } window.onload = function () { var canvas = document.getElementById("lockCanvas"); canvasWidth = document.body.offsetWidth;//网页可见区域宽 canvas.width = canvasWidth; canvas.height = canvasHeight; var cxt = canvas.getContext("2d"); /** * 每行3个圆 * OffsetX为canvas x方向内边距 * */ var X = (canvasWidth - 2 * OffsetX - R * 2 * 3) / 2; var Y = (canvasHeight - 2 * OffsetY - R * 2 * 3) / 2; createCirclePoint(X, Y); bindEvent(canvas, cxt); //CW=2*offsetX+R*2*3+2*X Draw(cxt, circleArr, [],null); } function Draw(cxt, circleArr, pwdArr,touchPoint) { if (pwdArr.length > 0) { cxt.beginPath(); for (var i = 0; i < pwdArr.length; i++) { var pointIndex = pwdArr[i]; cxt.lineTo(circleArr[pointIndex].X, circleArr[pointIndex].Y); } cxt.lineWidth = 10; cxt.strokeStyle = "#627eed"; cxt.stroke(); cxt.closePath(); if(touchPoint!=null){ var lastPointIndex=pwdArr[pwdArr.length-1]; var lastPoint=circleArr[lastPointIndex]; cxt.beginPath(); cxt.moveTo(lastPoint.X,lastPoint.Y); cxt.lineTo(touchPoint.X,touchPoint.Y); cxt.stroke(); cxt.closePath(); } } for (var i = 0; i < circleArr.length; i++) { var Point = circleArr[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(pwdArr.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(); } } } /** * 计算选中的密码 */ function getSelectPwd(touches,pwdArr){ for (var i = 0; i < circleArr.length; i++) { var currentPoint = circleArr[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 || pwdArr.indexOf(i) >= 0) continue; pwdArr.push(i); break; } } /** * 给画布绑定事件 */ function bindEvent(canvas, cxt) { var pwdArr = []; canvas.addEventListener("touchstart", function (e) { getSelectPwd(e.touches[0],pwdArr); }, false); canvas.addEventListener("touchmove", function (e) { e.preventDefault(); var touches = e.touches[0]; getSelectPwd(touches,pwdArr); cxt.clearRect(0,0,canvasWidth,canvasHeight); Draw(cxt,circleArr,pwdArr,{X:touches.pageX,Y:touches.pageY}); }, false); canvas.addEventListener("touchend", function (e) { cxt.clearRect(0,0,canvasWidth,canvasHeight); Draw(cxt,circleArr,pwdArr,null); alert("密码结果是:"+pwdArr.join("->")); pwdArr=[]; }, false); } </script> </head> <body> <canvas id="lockCanvas"></canvas> </body> </html>
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
华山资源网 Design By www.eoogi.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除!
免责声明:本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除!
华山资源网 Design By www.eoogi.com
暂无评论...
更新日志
2024年11月18日
2024年11月18日
- 【雨果唱片】中国管弦乐《鹿回头》WAV
- APM亚流新世代《一起冒险》[FLAC/分轨][106.77MB]
- 崔健《飞狗》律冻文化[WAV+CUE][1.1G]
- 罗志祥《舞状元 (Explicit)》[320K/MP3][66.77MB]
- 尤雅.1997-幽雅精粹2CD【南方】【WAV+CUE】
- 张惠妹.2007-STAR(引进版)【EMI百代】【WAV+CUE】
- 群星.2008-LOVE情歌集VOL.8【正东】【WAV+CUE】
- 罗志祥《舞状元 (Explicit)》[FLAC/分轨][360.76MB]
- Tank《我不伟大,至少我能改变我。》[320K/MP3][160.41MB]
- Tank《我不伟大,至少我能改变我。》[FLAC/分轨][236.89MB]
- CD圣经推荐-夏韶声《谙2》SACD-ISO
- 钟镇涛-《百分百钟镇涛》首批限量版SACD-ISO
- 群星《继续微笑致敬许冠杰》[低速原抓WAV+CUE]
- 潘秀琼.2003-国语难忘金曲珍藏集【皇星全音】【WAV+CUE】
- 林东松.1997-2039玫瑰事件【宝丽金】【WAV+CUE】