啤酒节上尿意浓-SVG低级艺术展示
领导：阿仁，有个很重要的任务需要你去执行。
阿仁：什么任务这么重要？
领导：最近我们有个新园区开张，还请了一个写手写了篇软文来炒作，《云破月来花弄影-SVG多种技术组合实现》，可惜这个写手除了长得帅，文章一点都不好，根本没有阅读量，所以决定派你卧底去这个园区，打探一下。
阿仁：这个园区有啥问题吗，是有黑帮在那里做交易，还是有境外势力在那边有基地？
领导：比这些重要。主要是园区人气太差，希望你假扮一个游客，帮忙了解下其他游客的想法，另外多说说我们园区的好处，鼓动游客参与，活跃气氛。
阿仁：领导，这个工作其实不叫卧底，有个更熟悉的名字
领导：是吗，啥名字？
阿仁：线上这个叫水军，线下叫托儿...
领导：你不愿意去？
阿仁：领导，我堂堂计算机专业毕业，干这个...
领导：请你用十条理由来说服所有的程序员，PHP是世界上最好的语言。
阿仁：领导，你这个园区叫啥名字？
领导：叫SVG园区。
1、啤酒节霓虹灯
阿仁经过一番乔装打扮（主要是换掉了格子衫，背了斜肩的挎包），来到了SVG园区。巧的很，一眼就看到了园区的霓虹灯牌子，正在举办啤酒节。
啤酒节霓虹灯的代码是这样的
<style>
body {
background: #1d2b29;
width: 100vw;
height: 100vh;
margin: 0;
overflow: hidden;
}
.svg-beerglass {
animation: flicker 4.1s infinite;
}
@keyframes flicker {
0% {
opacity: 0;
}
49% {
opacity: 0;
}
50% {
opacity: 1;
}
100% {
opacity: 1;
}
}
</style>
</head>
<body>
<svg width="2000px" height="670px">
<defs>
<filter id="beerbottleblur" x="-100%" y="-100%" width="300%" height="300%">
<feGaussianBlur in="SourceGraphic" stdDeviation="3" />
</filter>
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xmlns="http://www.w3.org/2000/svg" p-id="7275" width="128" height="128">
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</svg>
<g id="beerbottleneon">
<use xlink:href="#beerbottle" filter="url(#beerbottleblur)" />
<use xlink:href="#beerbottle" opacity="0.9" />
</g>
<g id="beerbottleneon1">
<use xlink:href="#beerbottleneon">
<animateTransform attributeName="transform" id="f1" attributeType='XML' begin='0s;t1.end' dur='2s'
type="rotate" from="0 0 0" to="0 0 0" />
<animateTransform attributeName="transform" id="s1" attributeType='XML' begin='f1.end' dur='0.1s'
type="rotate" from="0 64 64" to="70 64 64" />
<animateTransform attributeName="transform" id="t1" attributeType='XML' begin='s1.end' dur='2s'
type="rotate" from="70 64 64" to="70 64 64" />
</use>
</g>
<g id="beerglassneon">
<use xlink:href="#beerglass" filter="url(#beerbottleblur)" />
<use xlink:href="#beerglass" opacity="0.5" />
</g>
<path id="beerpath" d="M -20.501285,20 A 97.750643,50 0 0 0 175,20" />
<text id="beerday" fill-opacity="0.4" stroke="white" stroke-width="1" fill="none" font-size="25">
<textPath xlink:href="#beerpath" startOffset="40">SVG园区啤酒节</textPath>
</text>
<g id="beerdayneon">
<use xlink:href="#beerday" filter="url(#beerbottleblur)" />
<use xlink:href="#beerday" opacity="0.9" />
</g>
<circle id="beercircleback" r="110" fill="black" />
<circle id="beercircle" r="110" stroke="#31FF98" stroke-width="8" fill="none" >
<animate attributeName="stroke" id="f2" begin="0s;t2.end" from="#FFFFFF" to="#A8A8FF" dur="2s" />
<animate attributeName="stroke" id="s2" begin="f2.end" from="#A8A8FF" to="#FFFF00" dur="2s" />
<animate attributeName="stroke" id="t2" begin="s2.end" from="#FFFF00" to="#FFFFFF" dur="2s" />
</circle>
<g id="beercircleneon">
<use xlink:href="#beercircle" filter="url(#beerbottleblur)" />
<use xlink:href="#beercircle" opacity="0.9" />
</g>
<g id="beerdayboard">
<use xlink:href="#beercircleback" x="110" y="110" />
<use xlink:href="#beerbottleneon1" x="10" y="20" />
<use xlink:href="#beerglassneon" x="110" y="78" />
<use xlink:href="#beerdayneon" x="30" y="120" />
<use xlink:href="#beercircleneon" x="110" y="110" />
</g>
</defs>
<use xlink:href="#beerdayboard" x="10" y="10"/>
</svg>对于做霓虹灯的文章，大家可以看我之前的文章《堕落糜烂的光芒-CSS+SVG实现霓虹灯效果》和《亮瞎你的氪金眼-CSS+SVG实现霓虹灯动画》，这里主要讲之前没有用过一些知识点。
css动画效果，通过opacity让啤酒瓶突然消失
@keyframes flicker {
0% {
opacity: 0;
}
49% {
opacity: 0;
}
50% {
opacity: 1;
}
100% {
opacity: 1;
}
}
......
svg动画效果，通过rotate让啤酒瓶突然倾斜70度
<animateTransform attributeName="transform" id="f1" attributeType='XML' begin='0s;t1.end' dur='2s'
type="rotate" from="0 0 0" to="0 0 0" />
<animateTransform attributeName="transform" id="s1" attributeType='XML' begin='f1.end' dur='0.1s'
type="rotate" from="0 64 64" to="70 64 64" />
<animateTransform attributeName="transform" id="t1" attributeType='XML' begin='s1.end' dur='2s'
type="rotate" from="70 64 64" to="70 64 64" />
一般css动画和svg动画都是平滑运动的，但为了展现霓虹灯瞬间切换的效果，我设置了在关键帧突然切换，所以在49%的时候还没有变化，而在50%的时候突然显示，再配合svg的动画效果，在某个时间点快速的旋转一个角度，就造成了啤酒瓶突然切换倒酒的霓虹灯效果。啤酒杯的泡沫出现和消失的原理也是一样的。
“SVG园区啤酒节”则是使用了svg里面的“textPath”
<path id="beerpath" d="M -20.501285,20 A 97.750643,50 0 0 0 175,20" />先画好一个path，它的实际样子是这样的
“SVG园区啤酒节”就会沿着它的路径排列好，不过排列是从左上角开始的，所以我们用startOffset参数来调整文字起始的位置，最终调整好的代码是
<text id="beerday" fill-opacity="0.4" stroke="white" stroke-width="1" fill="none" font-size="25">
<textPath xlink:href="#beerpath" startOffset="40">SVG园区啤酒节</textPath>
</text>调整位置还有一种方法，就是修改text的坐标，给text的x设置一个数值也能够调整文字的位置
<text id="beerday" fill-opacity="0.4" stroke="white" stroke-width="1" fill="none" font-size="25" x="40">
<textPath xlink:href="#beerpath" >SVG园区啤酒节</textPath>
</text>这块单独的效果，可以在这里在线看到：请看
2、WC标识
阿仁为了完成领导的任务，带头喝起了啤酒，炒热了游客的气氛，在啤酒节气氛达到最高潮的时候，阿仁突然感觉到了啤酒的反扑，尿意汹涌的铺了上来，远处正好有堵墙，上面写着WC的标志，阿仁扶着墙踉跄的走了过去。
为了做旧，我把WC做了了处理，让标识显的残破，代码如下：
<svg id="wc" t="1565534122398" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="5989" width="32" height="32">
<path stroke="black" stroke-width="25" stroke-dasharray="910,324"
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p-id="5990" fill="none"></path>
</svg>
主要是用stroke-dasharray，具体的看这里
另外一个残破的对象是那个手指的标识，为了体现没固定好，在风中摇摆的样子，用了动画效果，代码如下：
<use id="finger" xlink:href="#finger">
<animateTransform attributeName="transform" id="first1" begin="0s;second1.end" dur="0.5s"
type="rotate" from="80" to="100"></animateTransform>
<animateTransform attributeName="transform" id="second1" begin="first1.end" dur="0.8s" type="rotate"
from="100" to="80"></animateTransform>
</use>这个用的animateTransform。在svg的动画里面，核心是三剑客：animate,animateTransform和animateMotion；
- animate主要用于元素数值属性的变化，比如width,height和颜色啥的
- animateTransform主要用于元素变换属性的变化，主要和Transform属性搭配，做一些放大缩小，斜切旋转的变化，这个例子就是用于旋转（rotate）的
- animateMotion主要做路径变化，下面有案例会详细讲。
3、尿意浓
阿仁被WC的标志搞糊涂了，不知道这个手指箭头的意思，看着这个晃悠的指向地面的手指，他恍然大悟，原来这是个露天厕所，指示牌的意思是让他就在这里解决，下体的告急已经不容他多想，他解开了拉链...
这个其实我最先想的是用之前在《天边一朵云-徒手用html生成一朵云，很真的那种》里面用到的filter组合，feTurbulence+feDisplacementMap，它们通过噪点，扭曲变形来改变图形，但是效果嘛，一言难尽啊。这是原始的尿路图：
是我在inkscap工具里一挥而就的，一看就是有生活经验的人画出来的，这个弧度，这个波浪感，没有几十年站着尿尿的经验怎么可能做到。然后就用filter加animate效果做出来了第一版
<filter id="filter-suibian" width="350%" height="250%" x="-100%" y="-100%">
<feTurbulence type="fractalNoise" baseFrequency="0.015" numOctaves="1" seed="1" />
<feDisplacementMap in="SourceGraphic" scale="0">
<animate attributeName="scale" id="first2" begin="0s;second2.end" from="5" to="15" dur="0.5s">
</animate>
<animate attributeName="scale" id="second2" begin="first2.end" from="15" to="5" dur="1s"></animate>
</feDisplacementMap>
</filter>
...
<use xlink:href="#suibian" filter="url(#filter-suibian)"/>最终效果如下：
这个效果相当的诡异，看的久了，感觉我还是需要去广州男子医院去一趟，解决下泌尿科的问题，在下半身的强烈不适下，我放弃了，决定上第二版。
<filter id="shock2">
<feTurbulence type="fractalNoise" baseFrequency="0.1" numOctaves="1" seed="2" result="noise" id="noise">
<animate attributeType="XML" attributeName="seed" from="2" to="120" dur="10s"
repeatCount="indefinite" />
</feTurbulence>
<feMorphology id="morph3" in="SourceGraphic" operator="dilate" radius="1" result="morph1" />
<feMorphology id="morph4" in="morph1" operator="erode" radius="1" result="morph2" />
<feComposite operator="out" in="morph2" in2="morph1" result="strokeText" />
<feDisplacementMap xChannelSelector="R" yChannelSelector="G" in="strokeText" in2="noise"
result="displacementMap" color-interpolation-filters="auto" scale="10" />
<feGaussianBlur stdDeviation="1" result="coloredBlur" />
<feMerge>
<feMergeNode in="coloredBlur" />
<feMergeNode in="displacementMap" />
</feMerge>
</filter>
<filter id="blur-suibian">
<feGaussianBlur in="SourceGraphic" stdDeviation="2" />
</filter>
<g id="suibian1">
<use xlink:href="#suibian" width="310" filter="url(#blur-suibian)" />
</g>
<use xlink:href="#suibian1" filter="url(#shock2)" />这个filter的组合，其实不是用在这里的，大家看过我《亮瞎你的氪金眼-CSS+SVG实现霓虹灯动画》文章的人就知道，这个filter是用来做霓虹灯效果的，我再加上一些高斯模糊（feGaussianBlur ），尝试了一下（呸呸，没有尝试）。不试不知道，试过后嘛....
感觉这个至少没有泌尿科的问题，但阿仁的啤酒一定喝的很多，量有点大啊。
4、苍蝇爬呀爬
阿仁终于畅快了，但这不文明的举动也引起了周围环境的变动，一只对骚味很敏感的苍蝇来到了这边，陶醉在这个气味中（是青岛的还是纯生的？）
之前讲过的animateMotion终于要用上了，为了让animateMotion出场，我特地配了只苍蝇，我容易吗？
这是我用inkscap随手画的路线图，再配上一只小小的苍蝇-------就是这只----->
，很小哦
<g id="fly">
<image xlink:href="fly.png" filter="url(#shadow)" width="8">
<animateMotion
path="m -54.38608,206.12261 34.03516,7.36844 38.94745,-3.50878 48.070278,-12.63161 26.315844,-21.40355 35.438668,18.24565 47.7194,-14.38599 43.50886,-31.22814 9.82459,-23.15794 -6.31581,-16.84214 -17.54389,-7.01756 -22.10531,0.70176 -9.82458,21.40355 -8.42107,23.50882 -35.78955,1.75439 -23.50883,-14.73687 -34.035154,16.49126 -29.824624,28.42111 -46.3158872,20.7018 -25.9649658,-14.38599 -16.491265,12.28072 z"
dur="10s" rotate="auto" repeatCount="indefinite" />
</image>
</g>这里的path就是上图中画的曲曲折折的图形的svg源码，配合animateMotion就能让苍蝇沿着path的路径走，注意rotate参数，如果不设置成auto的话，苍蝇图片只是沿着path平移，非常的假，看起来是这样的。
这种会倒车的苍蝇显然不是地球上的生物，很容易让阿仁怀疑这里是外星生物的基地，为了打消阿仁的疑心，我决定加上rotate属性。加了rotate=auto就不一样了，图片会沿着path的路径自动调整角度，加了后的效果是这样的
这就显得真实多了。
5、三影
阿仁其实来之前，仔细阅读了那篇《云破月来花弄影-SVG多种技术组合实现》的文章，为了证明他来过，他把流水对准了那棵花...
里故事：上一篇文章说过，云破月来花弄影的作者张先有个外号叫“张三影”。为了致敬他，我凑上了花的影子，阿仁的影子和啤酒瓶的影子，这也是三影...
花影的代码：
<image id="huazhi" xlink:href="huazhi.png" width="100">
<animateTransform attributeName="transform" id="first" begin="0s;third.end" dur="0.5s" type="rotate"
from="0 73 199" to="-5 73 199"></animateTransform>
<animateTransform attributeName="transform" id="second" begin="first.end" dur="0.2s" type="rotate"
from="-5 73 199" to="-7 73 199"></animateTransform>
<animateTransform attributeName="transform" id="third" begin="second.end" dur="0.4s" type="rotate"
from="-7 73 199" to="0 73 199"></animateTransform>
</image>
<use id="huazhiyin" xlink:href="#huazhi" filter="url(#huazhishadow)" transform="skewX(29)" />
<use xlink:href="#huazhiyin" x="-225" y="390" />
背影的代码：
<image xlink:href="by.png" x="140" y="368" width="150" filter="url(#blur-moon)" transform="skewX(10)" />啤酒瓶影子的代码（酒瓶是用svg画的，不是png图）
<svg id="jiupin" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="210mm" height="297mm"
viewBox="0 0 210 297" version="1.1" id="svg5721" inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
sodipodi:docname="jiuping.svg">
<defs id="defs5715" />
<sodipodi:namedview id="base" pagecolor="#ffffff" bordercolor="#666666" borderopacity="1.0"
inkscape:pageopacity="0.0" inkscape:pageshadow="2" inkscape:zoom="0.35" inkscape:cx="-112.85714"
inkscape:cy="560" inkscape:document-units="mm" inkscape:current-layer="layer1" showgrid="false"
inkscape:window-width="1920" inkscape:window-height="1000" inkscape:window-x="-11"
inkscape:window-y="-11" inkscape:window-maximized="1" />
<metadata id="metadata5718">
<rdf:RDF>
<cc:Work rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
<dc:title></dc:title>
</cc:Work>
</rdf:RDF>
</metadata>
<g inkscape:label="Layer 1" inkscape:groupmode="layer" id="layer1">
<path style="fill:#000000;stroke-width:0.12662637" inkscape:connector-curvature="0"
d="m 96.940112,135.10889 c -1.332179,-1.77624 -4.440595,-4.4406 -6.660894,-5.77278 -2.220298,-1.33218 -3.108418,-4.88465 -3.108418,-5.77277 0,-0.88812 0.44406,-4.4406 0.44406,-6.21684 0,-1.77623 -1.332178,-5.32871 -1.332178,-6.66089 -0.44406,-0.88812 -0.888119,-3.99654 -0.888119,-6.21683 0,0 1.332179,0.44405 1.332179,-1.33218 V 91.146988 c 0,0 0.444058,-0.88812 -1.332179,-1.332179 -1.776239,-0.44406 -4.440597,-0.888119 -6.660894,-0.888119 -2.220299,0 -5.328715,0.444059 -6.660894,0.888119 -1.776239,0.444059 -1.776239,0.888119 -1.776239,0.888119 v 11.989612 c 0,1.77624 1.776239,1.77624 1.776239,1.77624 0,2.22029 -0.44406,5.32871 -0.88812,6.21683 -0.444059,1.33218 -1.332179,4.88466 -1.332179,6.66089 0,1.77624 0.44406,5.32872 0.44406,6.21684 0,0.88812 -0.44406,4.44059 -3.108416,5.77277 -2.664359,1.33218 -5.328717,3.99654 -6.660895,5.77278 -1.332179,1.77624 -0.888119,5.77277 -0.888119,5.77277 v 48.84656 c 0,0 0,16.4302 0.44406,20.42674 0,3.99654 2.664357,7.54902 2.664357,7.54902 h 32.41635 c 0,0 2.664358,-3.55248 2.664358,-7.54902 0,-3.99654 0.44406,-20.42674 0.44406,-20.42674 v -48.84656 c -0.44406,0 0,-3.99653 -1.332179,-5.77277 z"
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<use xlink:href="#jiupinshadow" x="40" y="0" />最后完整版的画面是这样的
领导：阿仁啊，听说你在啤酒节上很卖力的炒气氛啊
阿仁：是的，为了能抬高园区的人气，我可是喝了不少，带动了不少人，领导你看还满意吗？
领导：满意，小伙子有前途，不过有个事要你收个尾。
阿仁：啥事啊
领导：园区那边的人说你最后离开啤酒节现场的时候喊了一声‘这一轮我请了’，他们把账单寄过来了。
阿仁：领导，那是我喝多了，不能算啊....
