效果图：注：下面的代码运行效果，请在支持html5浏览下执行，才能看到效果。 !doctype html html head titlecanvas简单画板/title style type="text/css" #can{ width:600px; height:500px; border:1px solid #ccc; margin-top:0px; margin-left:20px;} /style /head body h2 style="padding-left:20px"canvas简单画板/h2 canvas id="can" width="600" height="500"/canvas script type="text/javascript" function getBodyOffsetTop(el){ var top = 0; do...<a href="https://www.tulaoshi.com/n/20160219/1601670.html" target="_blank">[ 查看全文 ]</a></p> <div class="img_yyy_2"> <span>2016-02-19</span> <i>标签:</i> <div class="yyy_2_a"><a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> </div> </div> </div> </div> <div class="xiangguan_gg xiangguan_reader clearfix"> <div class="xiang_892_1" style="width:1158px;"> <h3><a href="https://www.tulaoshi.com/n/20160219/1601670.html" target="_blank">html5 canvas 简单画板实现代码</a>的相关文章</h3> </div> <div class="xiang_892_2" style="width:1158px;"> <ul id="loadmore_container" style="width:1158px;"> <li> <div class="xiang_892_2_1"><a href="/reader/1601657" target="_blank"><img src="https://img.tulaoshi.com/201602/19/acc522a532d9560c7b5dd0c557d002b5_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1601657.html" target="_blank">html5时钟实现代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 复制代码代码如下: !DOCTYPE HTML html head meta charset="UTF-8" style type="text/css" canvas{position:absolute;top:0px;left:0px;} /style title时钟/title /head body canvas id="canvas" width="200" height="200"/canvas canvas id="p_canvas" width="200" height="200"/canvas script type="text/javascript" //获取绘图对象 var canvas = document.getElementById('canvas'); var cont...<a href="https://www.tulaoshi.com/n/20160219/1601657.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/我的J8叫炫迈/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/17.jpg" /><span>我的J8叫炫迈</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">45</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1601191" target="_blank"><img src="https://img.tulaoshi.com/201602/19/2338eb50e928b503223b7a9ce3a306ff_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1601191.html" target="_blank">基于HTML5超酷摄像头（HTML5 webcam）拍照功能实现代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> WebRTC可能是明年最受关注的HTML5标准了，Mozilla为此开发了一套帮助你控制硬件的API，例如，摄像头，麦克风，或者是加速表。你可以不依赖其它的插件来调用你需要的本机硬件设备。 在今天的这篇文章中，我们将介绍来自Wolfram Hempel开发的Photobooth.js，使用这个类库可以帮助你快速的调用摄像头功能，你可以很容易的添加摄像头功能到网站中。并且快速的帮助你拍照，你可以使用这个功能来实现用户的大头...<a href="https://www.tulaoshi.com/n/20160219/1601191.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/dengbin1028/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/1.jpg" /><span>dengbin1028</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">173</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1600405" target="_blank"><img src="https://img.tulaoshi.com/201602/19/c184983467dc05bde15271abcd2f519b_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1600405.html" target="_blank">html5 canvas-1.canvas介绍(hello canvas)</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">从今天开始，我们将开始一个关于html5 canvas的系列课程。这个系列是我读《HTML5 Canvas：Native Interactivity and Animation for the Web》后的总结，有兴趣的朋友可以去下载英文原版书籍阅读。这本书通过介绍canvas游戏开发的方式，向我们展现canvas强大的功能，我觉得相当不错，通过阅读这本书我学到了canvas很多的知识。其实canvas本身的api并不多，关键是活学活用，学会对api的组合使用制作出令人难以置...<a href="https://www.tulaoshi.com/n/20160219/1600405.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/猎狐狸/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/25.jpg" /><span>猎狐狸</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">4</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1601669" target="_blank"><img src="https://img.tulaoshi.com/201602/19/d43c2c57efdc0b6dcabde6bf6981a1ae_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1601669.html" target="_blank">html5 canvas 使用示例</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 复制代码代码如下: !DOCTYPE HTML html head meta charset="UTF-8" titleHTML5示例/title style type="text/css" #container{border:1px solid #ccc;width:800px;height:600px;position:relative;} canvas{position:absolute;top:0px;left:0px;z-index:1;} /style /head body select id="tools" option value="pen"铅笔/option option value="line"直线/option option value="rect"矩形/optio...<a href="https://www.tulaoshi.com/n/20160219/1601669.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/cj7182006/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/29.jpg" /><span>cj7182006</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">4</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595336" target="_blank"><img src="https://img.tulaoshi.com/201602/19/f74a94158704ea8a8d469d474822491d_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595336.html" target="_blank">HTML5 Canvas实现平移/放缩/旋转deom示例(附截图)</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">HTML5 Canvas中提供了实现图形平移，旋转，放缩的API。 平移(translate) 平移坐标translate(x, y)意思是把(0,0)坐标平移到(x, y)，原来的(0,0)坐标则变成(-x, -y) 图示如下： 任何原来的坐标点p(ox, oy)在translate之后的坐标点为p(ox-x, oy-y),其中点(x, y)为平移 点坐标translate(x, y)。 代码演示： 代码如下： // translate is move the startpoint to centera and back to top left ...<a href="https://www.tulaoshi.com/n/20160219/1595336.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/东少丶天平/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/26.jpg" /><span>东少丶天平</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">76</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1601246" target="_blank"><img src="https://img.tulaoshi.com/201602/19/cc4642d94fbdad003e7bf6142a2bcda8_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1601246.html" target="_blank">html5 canvas 画图教程案例分析</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">虽然大家都称Canvas为html5的新标签，看起来好像Canvas属于html语言的新知识，但其实Canvas画图是通过javascript来做的。所以，如果你想学习Canvas画图，你必须要有Javascript基础。 另外，画图嘛，总有一些图像方面的术语和知识点，所以如果你有过做图或美工经验，学习Canvas会更容易。 Canvas，意为画布也。而Html5中的Canvas也真的跟现实生活中的画布非常相似。所以，把他看成一块实实在在的画布可以加快...<a href="https://www.tulaoshi.com/n/20160219/1601246.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/依安安逸/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/26.jpg" /><span>依安安逸</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">24</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1594878" target="_blank"><img src="https://img.tulaoshi.com/201602/19/19965d69a04d65d40ecdef4529d5a2c5_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1594878.html" target="_blank">HTML5 Canvas自定义圆角矩形与虚线示例代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">HTML5 Canvas自定义圆角矩形与虚线(RoundedRectangle and Dash Line) 实现向HTML Canvas 2d context绘制对象中添加自定义的函数功能演示，如何绘制虚线以及控制虚线间隔大小，学会绘制圆角矩形的技巧。 HTML5 Canvas绘制对象中提供的原生功能没有实现绘制圆角矩形与虚线的功能，但是通过JavaScript语言的Object.prototype可以实现对对象CanvasRenderingContext2D添加这两个函数功能。代码的演示效果如下：...<a href="https://www.tulaoshi.com/n/20160219/1594878.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/smile124578/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/18.jpg" /><span>smile124578</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">33</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595345" target="_blank"><img src="https://img.tulaoshi.com/201602/19/9f4a5a28f3ebbf81615bdbd62a3839bf_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595345.html" target="_blank">html5记忆翻牌游戏实现思路及代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 翻开的2张牌如果配对就会消除，否则2张牌都会返回背面。 需求分析 怎么绘制正的牌面和背的牌面及配对成功后怎么消除牌面 怎么生成牌组并且确定每张牌的位置和对应的图片 怎么洗牌 怎么记录牌组的配对信息 怎么确定点击事件是第一次点击还是第二次点击 作弊事件的处理：两次点击同一张牌 点击已经消除的牌面 点击牌面之外的区域 牌翻开之后需要给一定时间让玩家看清楚，怎么实现暂停 鼠标...<a href="https://www.tulaoshi.com/n/20160219/1595345.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/QQ1839281999/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/5.jpg" /><span>QQ1839281999</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">84</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595199" target="_blank"><img src="https://img.tulaoshi.com/201602/19/7085cf80708f8b5966c584858e283524_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595199.html" target="_blank">Html5实现iPhone开机界面示例代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">今天我突发其想，想到可以用Html5来仿照苹果操作系统做一个能在Web平台运行的ios。 当然，要开发出一个操作系统，等我再归山修练一百年再说吧。今天就先娱乐一下，先搞一个开机界面。 完工后的图片： 担心图片是被我PS后的同学可以直接进入下面的地址测试： http://www.cnblogs.com/yorhom/articles/3163078.html 由于lufylegend封装得的确不错，本次开发还是用该引擎做的。代码不多，感兴趣的朋...<a href="https://www.tulaoshi.com/n/20160219/1595199.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/371599645/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/9.jpg" /><span>371599645</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">19</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1577153" target="_blank"><img src="https://img.tulaoshi.com/201602/17/0ce3e24063c447e096442f8fd56de1e5_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160217/1577153.html" target="_blank">详解HTML5创意画板的设计教程</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/pmsj/" target="_blank">平面设计</a> <a href="https://www.tulaoshi.com/hbsj/" target="_blank">海报设计</a> <a href="https://www.tulaoshi.com/ggsj/" target="_blank">广告设计</a> <a href="https://www.tulaoshi.com/huabaosheji/" target="_blank">画报设计</a> <a href="https://www.tulaoshi.com/qmsj/" target="_blank">签名设计</a> <a href="https://www.tulaoshi.com/fzsj/" target="_blank">服装设计</a> <a href="https://www.tulaoshi.com/mpsj/" target="_blank">名片设计</a> <a href="https://www.tulaoshi.com/huacesheji/" target="_blank">画册设计</a> <a href="https://www.tulaoshi.com/banshisheji/" target="_blank">版式设计</a> <a href="https://www.tulaoshi.com/shangbiaosheji/" target="_blank">商标设计</a></div> <div class="span_em_123"> 在HTML5备受期待和瞩目的今天，越来越多的人已经感受到它带来的无限魅力与震撼力，许多的技术人员、设计者、互联网爱好者们纷纷加入了HTML5的研究与设计中。 首先我先为大家介绍一下一个功能很强大的HTML5在线绘画应用，它还拥有多种笔刷和滤镜，具有类似于photoshop的图层功能，可调节透明度隐藏等，还有渐变、油漆桶、拾色器、选择工具，大家一定会为此感到惊讶吧。 但这样复杂的应用并没有使用flash...<a href="https://www.tulaoshi.com/n/20160217/1577153.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/燄王幽/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/23.jpg" /><span>燄王幽</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">1</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1597120" target="_blank"><img src="https://img.tulaoshi.com/201602/19/355bac96708319d4ee3c0c4f9b034059_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1597120.html" target="_blank">程序设计HTML5 Canvas API</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 代码如下： script type="text/javascript" try { document.createElement("Canvas").getContext("2d"); document.getElementById("support").innerHTML = "OK"; } catch (e) { document.getElementById("support").innerHTML = e.message; } /script 加入Canvas canvas id="diagonal" style="border:1px solid blue;" width="200" height="200"/ 代码如下： ...<a href="https://www.tulaoshi.com/n/20160219/1597120.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/123yanzipen123/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/10.jpg" /><span>123yanzipen123</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">6</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1600309" target="_blank"><img src="https://img.tulaoshi.com/201602/19/55a5aadaeb468853dd8609f2988b6551_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1600309.html" target="_blank">html5中canvas学习笔记1-画板的尺寸与实际显示尺寸</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">在canvas中当在canvas上写width和height时为canvas的实际画板大小，默认情况下width为300px，height为150px。 在style里面写css样式的时候widht和height为实际显示尺寸大小。 现在以用canvas画一个对角线为例 ： 代码如下： !DOCTYPE html head meta charset=utf-8 / titlecanvas/title script type='text/javascript' window.onload = function(){ getCanvas(); }; //canvase绘图 function g...<a href="https://www.tulaoshi.com/n/20160219/1600309.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/完和妹/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/19.jpg" /><span>完和妹</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">25</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1597137" target="_blank"><img src="https://img.tulaoshi.com/201602/19/39e1cda228a1a228cce8ac51f541c5cc_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1597137.html" target="_blank">HTML5组件Canvas实现图像灰度化(步骤+实例效果)</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 新建一个html页面，在body tag之间加入 代码如下： canvas id="myCanvas" Gray Filter/canvas 添加一段最简单的JavaScript 脚本 代码如下： pre name="code" class="javascript"window.onload = function() { var canvas = document.getElementById("myCanvas"); span style="white-space:pre" /span// TODO: do something here } 从Canvas对象获取绘制对象上下文Context的代码如下： 代码...<a href="https://www.tulaoshi.com/n/20160219/1597137.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/昨日黄昏以后/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/27.jpg" /><span>昨日黄昏以后</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">8</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595324" target="_blank"><img src="https://img.tulaoshi.com/201602/19/1a35b9b5caca6d64a257df7ca5b02217_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595324.html" target="_blank">HTML5 Canvas如何实现纹理填充与描边(Fill And Stroke)</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">演示HTML5 Canvas Fill 与Stroke文字效果，基于Canvas如何实现纹理填充与描边。 一：颜色填充与描边 颜色填充可以通过fillStyle来实现，描边颜色可以通过strokeStyle来实现。简单示例 如下： 代码如下： // fill and stroke text ctx.font = '60pt Calibri'; ctx.lineWidth = 3; ctx.strokeStyle = 'green'; ctx.strokeText('Hello World!', 20, 100); ctx.fillStyle = 'red'; ctx.fillText('...<a href="https://www.tulaoshi.com/n/20160219/1595324.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/飞过の海/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/14.jpg" /><span>飞过の海</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">198</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595233" target="_blank"><img src="https://img.tulaoshi.com/201602/19/4b95a040fc114d3d82e8e0e697fa7373_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595233.html" target="_blank">HTML5 Canvas渐进填充与透明实现图像的Mask效果</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">详细解释HTML5 Canvas中渐进填充的参数设置与使用，Canvas中透明度的设置与使用，结合渐进填充与透明度支持，实现图像的Mask效果。 一：渐进填充(Gradient Fill) Canvas支持两种渐进填充方式，一种为线性渐进填充(Line Gradient Fill)，另外一种称 为经向渐变填充(RadialGradient Fill)。其API分别为： createLinearGradient(x1, y1, x2, y2); 其中x1,y1为第一个点坐标，x2,y2为第二个点坐标。 creat...<a href="https://www.tulaoshi.com/n/20160219/1595233.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/lly5900/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/13.jpg" /><span>lly5900</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">177</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595268" target="_blank"><img src="https://img.tulaoshi.com/201602/19/55f08e35efe75254d8186cb0e6357276_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595268.html" target="_blank">HTML5 Canvas鼠标与键盘事件demo示例</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">演示HTML5 Canvas鼠标事件，获取Canvas对象上的鼠标坐标，演示键盘事件通过键盘控制Canvas上对象移动。 Canvas对象支持所有的JavaScript的鼠标事件，包括鼠标点击(MouseClick), 鼠标按下(Mouse Down), 鼠标抬起(Mouse Up),鼠标移动( Mouse Move)对Canvas添加鼠标事件方式有两种，一种方式是通过API来完成： 代码如下： // mouse event canvas.addEventListener("mousedown",doMouseDown,false); canva...<a href="https://www.tulaoshi.com/n/20160219/1595268.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/第十三滴菜籽油/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/18.jpg" /><span>第十三滴菜籽油</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">46</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595333" target="_blank"><img src="https://img.tulaoshi.com/201602/19/d3f49c483183eb0d9bb2a7799fdb6a9a_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595333.html" target="_blank">html5弹跳球示例代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 代码如下： html head meta charset=utf-8 title跳跳球/title script //box var box_x=0; var box_y=0; var box_width=300; var box_height=300; //注意:定位球采用球的中心 var ball_x=10; var ball_y=10; var ball_radius=10; var ball_vx=5; var ball_vy=3; var box_bound_left=box_x+ball_radius; var box_bound_right=box_x+box_width-ball_radius; var box_bound_top=box_...<a href="https://www.tulaoshi.com/n/20160219/1595333.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/自各的心自各疼/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/23.jpg" /><span>自各的心自各疼</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">1</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1593054" target="_blank"><img src="https://img.tulaoshi.com/201602/19/d1130cb62dc6d5494d965bc95988c6ff_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1593054.html" target="_blank">用html5的canvas画布绘制贝塞尔曲线完整代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">查看效果：http://keleyi.com/keleyi/phtml/html5/7.htm 完整代码： 代码如下： !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" html xmlns="http://www.w3.org/1999/xhtml" head title用html5的canvas画布绘制贝塞尔曲线/title /head body div a href="http://keleyi.com/a/bjac/j77m9131.htm" target="_blank"原文...<a href="https://www.tulaoshi.com/n/20160219/1593054.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/指绾青丝/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/24.jpg" /><span>指绾青丝</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">51</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1595124" target="_blank"><img src="https://img.tulaoshi.com/201602/19/e83a1b10d990e24ff5efb2a7c0ef63e0_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1595124.html" target="_blank">html5的画布canvas——画出简单的矩形、三角形实例代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">首先在html页面中放置一个canvas元素，其中canvas元素应该具备三个属性ID、width、height。 代码如下： canvas id="demo" width="600" height="600"/canvas 取得canvas对象并取得上下文var cxt=document.getElementById('demo').getContext("2d");其中参数2d是确定的。 开始绘制，有两种形式，一种是描边（fill），一种是填充（stroke）。 javascript代码： 代码如下： script langua...<a href="https://www.tulaoshi.com/n/20160219/1595124.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/我是挖工/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/24.jpg" /><span>我是挖工</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">102</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1601199" target="_blank"><img src="https://img.tulaoshi.com/201602/19/82b46005650b654822be6541ab88ea4b_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1601199.html" target="_blank">HTML5 Canvas像素处理使用接口介绍</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">内容概要：本文通过简单的代码实例，以及略猥琐的图片demo，展示了canvas在图像像素数据操作方面的常用接口。至于如何利用这几个接口实现更复杂的效果，则会在后续章节里继续讲述。 一、canvas图片填充； 2、设置/获取canvas图片数据； 3、创建canvas图片数据；4、关于imageData.data的一点补充； 5、写在后面 一、canvas图片填充 代码如下： /** * @description * @param {Number} x 图像起始绘制...<a href="https://www.tulaoshi.com/n/20160219/1601199.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/安徒生地谎话/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/9.jpg" /><span>安徒生地谎话</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">36</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> </ul> <div id="pages" class="clearfix"> <a href="/reader/21896.html">上一页</a><a href="/reader/21893.html">21893</a><a href="/reader/21894.html">21894</a><a href="/reader/21895.html">21895</a><a href="/reader/21896.html">21896</a><a href="/reader/21897.html" class="cur">21897</a><a href="/reader/21898.html">21898</a><a href="/reader/21899.html">21899</a><a href="/reader/21900.html">21900</a><a href="/reader/21901.html">21901</a><a href="/reader/21898.html">下一页</a> </div> </div> </div> <!--footer底部--> <script 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