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Jun 24, 2016 am 11:32 AM

接着之前的[css]我要用css画幅画(五)，由于这个画已经画了很久了，这次一次性加了比较多更新，算是让这幅画告一段落吧。本次的更新包括：

1. 给云增加动画

2. 画了一棵树

3. 树上画了一个苹果，并给苹果增加坠落的动画

其实还有一个TODO List，不过这个List没有也可以算完成，所以这个List可能会无限期搁置：

1. 苹果坠落前左右摇晃一下

2. 苹果落地后滚动几圈

那么进入正题。

github：https://github.com/bee0060/Css-Paint

demo： http://bee0060.github.io/Css-Paint/pages/sun-house/sun-house-6.html

完整html如下：

 1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4     <meta charset="UTF-8"> 5     <title>Css Paint</title> 6     <link rel="stylesheet" type="text/css" href="../../css/sun-house/sun.css" /> 7     <link rel="stylesheet" type="text/css" href="../../css/sun-house/house.css" /> 8     <link rel="stylesheet" type="text/css" href="../../css/sun-house/human.css" /> 9     <link rel="stylesheet" type="text/css" href="../../css/sun-house/cloud.css" />10     <link rel="stylesheet" type="text/css" href="../../css/sun-house/tree.css">11     <link rel="stylesheet" type="text/css" href="../../css/sun-house/apple.css">12 13     <link rel="stylesheet" type="text/css" href="../../css/sun-house/human-animate.css" />14     <link rel="stylesheet" type="text/css" href="../../css/sun-house/cloud-animate.css" />15 16     <script type="text/javascript" src="js/analysis.js"></script>17 </head>18 <body>19     <div class="sun">20         <div class="sun-body"></div>21         <div class="sun-shine-light sun-shine-light1"></div>22         <div class="sun-shine-light sun-shine-light2"></div>23         <div class="sun-shine-light sun-shine-light3"></div>24         <div class="sun-shine-light sun-shine-light4"></div>25         <div class="sun-shine-light sun-shine-light5"></div>26     </div>27 28     <div class="house-width house">29         <div class="house-width house-roof house-roof-left"></div>30         <div class="house-width house-roof house-roof-right"></div>31         <div class="house-width house-wall">            32             <div class="house-wall-door">                33                 <div class="house-wall-door-handle"></div>34             </div>35         </div>36     </div>37 38     <div class="human human-pos-1">39         <p class="lines human-speak">大家好，我叫小明。</p>40         <p class="lines human-speak human-speak-delay-3">我是一个程序员，最喜欢宅在家里LOL。</p>41         <p class="lines human-speak human-speak-delay-12">静静，我们交个朋友好吗？我的电话是13800123456。</p>42         <div class="human-head-normal"></div>43         <div class="human-body-normal"></div>44         <div class="human-arms-normal"></div>45         <div class="human-legs-normal"></div>46     </div>47 48     <div class="human human-pos-2">49         <p class="lines human-speak human-speak-delay-6">大家好，我叫静静</p>50         <p class="lines human-speak human-speak-delay-9">和大家看到的一样，我热爱舞蹈。</p>51         <p class="lines human-speak human-speak-delay-15">不要，程序员什么的最讨厌了！</p>52         <div class="human-head-normal"></div>53         <div class="human-body-normal"></div>54         <div class="human-arms-normal"></div>55         <div class="human-legs-1"></div>56     </div>57 58     <div class="cloud cloud-pos cloud-pos-1 cloud-animate-1">59         <div class="cloud-pos cloud-border cloud-bg cloud-top"></div>60         <div class="cloud-pos cloud-border cloud-bg cloud-left"></div>61         <div class="cloud-pos cloud-border cloud-bg cloud-right"></div>62         <div class="cloud-pos cloud-border cloud-bg cloud-bottom"></div>63     </div>64     <div class="cloud cloud-pos cloud-pos-2 cloud-animate-2">65         <div class="cloud-pos cloud-border cloud-bg cloud-top"></div>66         <div class="cloud-pos cloud-border cloud-bg cloud-left"></div>67         <div class="cloud-pos cloud-border cloud-bg cloud-right"></div>68         <div class="cloud-pos cloud-border cloud-bg cloud-bottom"></div>69     </div>70 71     <div class="tree">72         <div class="tree-top">73             <div class="tree-crowwn tree-crowwn-left"></div>74             <div class="tree-crowwn tree-crowwn-top"></div>75             <div class="tree-crowwn tree-crowwn-right"></div>76             <div class="tree-crowwn tree-crowwn-bottom"></div>77         </div>78         <div class="tree-middle">79             <div class="tree-trunk"></div>80         </div>81         <div class="tree-bottom">82             <div class="tree-root tree-root-left"></div>83             <div class="tree-root tree-root-middle"></div>84             <div class="tree-root tree-root-right"></div>85         </div>86     </div>87     <!-- TODO:     1.苹果左右震动一下再下跌88             2.苹果跌下来后向左滚动几圈 -->89     <div class="apple">90         <div class="apple-body apple-left"></div>91         <div class="apple-body apple-right"></div>92         <div class="apple-stalk"></div>93     </div>94 </body>95 </html>

增加的css如下：

 1 .cloud-animate-1 { 2     -webkit-animation-duration: 20s; 3       -webkit-animation-name: cloudMove-1; 4       -webkit-animation-iteration-count: infinite; 5       -webkit-animation-direction: alternate; 6 } 7  8 .cloud-animate-2 { 9     -webkit-animation-duration: 20s;10       -webkit-animation-name: cloudMove-2;11       -webkit-animation-iteration-count: infinite;12       -webkit-animation-direction: alternate;13 }14 15 @-webkit-keyframes cloudMove-1 {16     25% {17         top : 10px;18     }19 20     50% {21         top: 50px;22     }23 24     75% {25         top: 20px; 26     }27 28     to {     29         left: 10%     30     }31 }32 33 @-webkit-keyframes cloudMove-2 {34     25% {35         top : 30px;36     }37 38     50% {39         top: 80px;40     }41 42     75% {43         top: 10px; 44     }45 46     to { 47         left: 85%         48     }49 }

 1 .tree{ 2     bottom: 10px; 3     height: 700px; 4     position: absolute; 5     right: 120px; 6     width: 500px; 7 } 8  9 .tree-crowwn {10     background-color: green;11     border-radius: 50%;12     position: absolute;13     z-index: 2;14 }15 16 .tree-crowwn-left {17     height: 250px;18     top: 150px;19     width: 250px;20 }21 22 .tree-crowwn-top {23     height: 320px;24     left: 100px;25     width: 320px;26 }27 28 .tree-crowwn-right {29     height: 250px;30     left: 250px;31     top: 150px;32     width: 250px;33 }34 35 .tree-crowwn-bottom {36     height: 120px;37     left: 150px;38     top: 270px;39     width: 200px;40 }41 42 .tree-trunk {43     background-color: #5d2323;44     height: 280px;45     left: 170px;46     position: absolute;47     top: 350px;48     width: 180px;49     z-index: 1;50 }51 52 .tree-bottom {53     position: absolute;54     top: 630px;55 }56 57 .tree-root {58     background-color: #503333;    59     height: 30px;60     position: absolute;61     width: 20px;62 }63 64 .tree-root-left {65     left: 170px;66     -webkit-transform: matrix(1, 0, -0.5, 1, 0, 0);67     -webkit-transform-origin: right top;68 }69 70 .tree-root-middle {71     left: 250px;72     -webkit-transform: matrix(1, 0, -0.1, 1, 0, 0);73 }74 75 .tree-root-right {76     left: 330px;77     -webkit-transform: matrix(1, 0, 0.5, 1, 0, 0);78     -webkit-transform-origin: left top;79 }

 1 .apple { 2     bottom: 360px; 3     height: 60px;     4     position: absolute; 5     right: 480px; 6     width: 60px; 7     z-index: 3; 8  9     -webkit-animation-duration: 1.5s;10     -webkit-animation-delay: 18s;11       -webkit-animation-name: appleDrop;12       -webkit-animation-timing-function: cubic-bezier(0.5, 0.1, 0.85, 0.3);13       -webkit-animation-fill-mode: forwards;14 }15 16 .apple-body {17     background-color: #ff3300;    18     border-radius: 75% 75% 90% 90%;19     height: 50px;20     position: absolute;21     width: 37px;22     z-index: 3;23 }24 25 .apple-left {26 27 }28 29 .apple-right {30     right:2px;31 }32 33 .apple-stalk {34     border: none;35     border-radius: 100%;36     border-right: 3px solid #000;37     height:20px;38     left: 8px;39     position: absolute;40     top:-10px;41     width:20px;42     z-index: 2;43 }44 45 @-webkit-keyframes appleDrop{46     from{47          48     }49     20%{50          51     }52     80%{53          54     }55     to{56         bottom: 35px;57     }58 }

这里用到的陌生的css属性包括(直接附上相关的MDN文档链接）：

1. animation-iteration-count - 代表动画执行的次数，默认值为1。值可以是非负整数或infinite关键字， infinite表示执行无数次。

2. animation-direction - 代表关键帧的运行方向，默认值为normal。可选的值共包括：

normal：正向执行，顺序为从from(0%)执行到to(100%)。

reverse：反向执行，顺序为从to(100%)执行到from(0%)。

alternate: 先正向执行再反向执行，也可以理解为奇数次时正向执行，偶数次时反向执行。

alternate-reverse：和alternate相反，先反向执行再正向执行。

3. animation-timing-function - MDN文档说该属性用于定义动画在周期中执行的节奏，我的理解是用于定义动画中帧之间属性的变化速率。默认值是ease(缓动-先加速再减速）。

　　通常可以用简写来指定，常用的简写有缓动（ease,ease-in,ease-out,ease-in-out）和匀速（linear）。除了关键字外，还有稍微特殊的设置：

steps : 语法为 steps(N, target) , N为正整数， target为目标，可以设置start或end（其他值没试过，文档中也没提到）。意思就是，不匀速的分N次到达start。这里举个栗子

cubic-bezier：贝塞尔曲线，语法为 cubic-bezier(x1, y1, x2, y2)，其中四个参数都是小数，可以为负数。通过x和y坐标，定出2个点，通过这两个点，描述一个变化曲线。还没深入研究过，这里暂不多谈。前面的链接是百度百科的，有兴趣可以看看。今天搜到一个不错的网站，可以用来感受一下贝塞尔曲线在动画上的实际效果：http://cubic-bezier.com/#.17,.67,.83,.67 。平时写动画时也可以借助这个网站，不用辛苦的调半天数字。

　　想深入了解这个属性，建议找找更深入的文章，这里只是浅尝辄止：）

4. animation-fill-mode - 用于声明动画执行结束后的目标样式，默认值为none。该值受animation-direction和 animation-iteration-count值的影响。若animation-iteration-count的值是infinite，动画不会结束，则该属性无效。

　　可选值包括：

　　none - 动画结束后，不采用动画关键帧设置的样式。

　　forward - 采用动画最后一帧时的样式

　　backward - 采用动画第一帧时的样式

　　both - 同时采用动画第一帧和最后一帧时的样式。但值有冲突的属性不知道会如何处理。

　　关键帧的设置中，第一帧不一定是from(0%),最后一帧并不一定是to(100%), 具体情况如下表，以下表格是我翻译MDN中得来的：

animation-direction animation-iteration-count 第一帧最后一帧

normal	任何值	0% or from	100% or to
reverse	任何值	100% or to	0% or from
alternate	偶数	0% or from	0% or from
alternate	奇数	0% or from	100% or to
alternate-reverse	偶数	100% or to	100% or to
alternate-reverse	奇数	100% or to	0% or from

PS：以上四个属性和animation-name一样，都可以以逗号分隔设置多个值，每个值用于描述animation-name中相同位置的动画规则。animation-name，关键帧的简要信息可以查看[css]我要用css画幅画(五)

好了，今天就到这里，这幅sun-house的画也告一段落。以后再看看画些啥吧。谢谢阅读。

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