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线条之美

线条之美,玩转SVG线条动画

2017/02/28 · HTML5 · SVG

原稿出处: AlloyTeam   

习感觉常来讲web前端完结动画效果主要通过上面三种方案:

  • css动画;利用css3的体裁效果能够将dom成分做出动画的效用来。
  • canvas动画;利用canvas提供的API,然后利用清除-渲染那样一帧一帧的做出动画效果。
  • svg动画;一样svg也提供了相当多的API来兑现动画效果,何况宽容性也不差,本文首要讲授一下怎么创建svg线条动画。

先来看多少个成效:

图片 1demo

图片 2demo

图片 3demo

上述这几个功用都以选拔SVG线条动画完毕的,只用了css3和svg,未有运用一行javascript代码,那或多或少和canvas比起来要轻易一些,下边就认证一下跌实那么些意义的规律。

有关SVG的基础知识,作者这里就不再陈说了,我们能够一向在文书档案中查阅相关的API,这里只说一下跌实线条动画首要使用的:path (路线)

<path> 标签命令

  • M = moveto
  • L = lineto
  • H = horizontal lineto
  • V = vertical lineto
  • C = curveto
  • S = smooth curveto
  • Q = quadratic Belzier curve
  • T = smooth quadratic Belzier curveto
  • A = elliptical Arc
  • Z = closepath

动用path的那一个命令大家得以兑现我们想要的别的线条组合,以一段轻松的线条为例:

XHTML

<path id="path" fill="none" stroke="#000" stroke-width="1px" d="M452,293c0,0,0-61,72-44c0,0-47,117,81,57 s5-110,10-67s-51,77.979-50,33.989"/>

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<path id="path" fill="none" stroke="#000" stroke-width="1px" d="M452,293c0,0,0-61,72-44c0,0-47,117,81,57
    s5-110,10-67s-51,77.979-50,33.989"/>

效果:

图片 4

呵呵,看起来相当粗略,然而,怎样让那一个线条动起来吧?这里就要通晓到SVG里的path的局地重大质量:

  1. stroke:标记路线的水彩;
  2. d:标识路线命令的集聚,那性情格重要决定了线条的形象。
  3. stroke-width:标记路线的上涨的幅度,单位是px;
  4. stroke-dasharray:它是二个<length>和<percentage>数列,数与数以内用逗号只怕空白隔离,钦命短划线和缺口的长度。若是提供了奇数个值,则这么些值的数列重复二回,进而成为偶数个值。因而,5,3,2同等5,3,2,5,3,2;
  5. stroke-dashoffset:标志的是全体路线的偏移值;

以一张图来解释stroke-dasharray和stroke-dashoffset更便于精通一些:

图片 5

所以,大家前边的不二诀要就可以成为这几个样子:

CSS

#path { stroke-dasharray: 3px, 1px; stroke-dasharray: 0; }

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#path {
        stroke-dasharray: 3px, 1px;
        stroke-dasharray: 0;
}

效果:

图片 6

明白了stroke-dasharray的成效之后,上边大家就能够动用css3的animation来让那几个门路动起来。

Sass

#path {     animation: move 3s linear forwards; }   @keyframes move {       0%{           stroke-dasharray: 0, 511px;       }       100%{           stroke-dasharray: 511px, 511px;       } }

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#path {
    animation: move 3s linear forwards;
}
 
@keyframes move {
      0%{
          stroke-dasharray: 0, 511px;
      }
      100%{
          stroke-dasharray: 511px, 511px;
      }
}

效果:

图片 7

511以此值是一切路线的长度,能够用js的document.getElementById(‘path’).getTotalLength()获得

stroke-dasharray: 0, 511; 表示实线和空隙的长度分别为 0 和 511,所以一开始一切路线都以空隙,所以是空的。
下一场对接到 stroke-dasharray: 511, 511; 因为任何线条的长短就是511,而实线的长度也逐步成为511,所以一切线条就应时而生了。

同一使用stroke-dashoffset也得以兑现那么些意义,原理就是开始时代线条分为511实线,和511空隙,不过由于设置了offset使线条偏移不可知了,当不唯有修改offset后,线条稳步出现。

Sass

#path {     animation: move 3s linear forwards;     stroke-dasharray: 511px,511px; }   @keyframes move {   0%{       stroke-dashoffset: 511px;   }   100%{       stroke-dashoffset: 0;   } }

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#path {
    animation: move 3s linear forwards;
    stroke-dasharray: 511px,511px;
}
 
@keyframes move {
  0%{
      stroke-dashoffset: 511px;
  }
  100%{
      stroke-dashoffset: 0;
  }
}

效果:

图片 8

当大家精通了上述的章程后,整个利用SVG达成线条动画的原理就早就领会了,我们须求的就是五个SVG路线了,可是总画一些简练的线条依然不美啊,这我们怎么样技能得到复杂的svg路线呢?

  1. 找UI设计员要多个。
  2. 自个儿行使PS和AI做二个,只需求轻便的2步。

图片 9

以部落LOGO为例:

1,得到部落LOGO的png图片。

2,右键图层,然后点击从选区生成工作门路,大家就足以得到:

图片 10

3,文件–导出–路线到AI,将路线导出在AI里面展开。

图片 11

4,在AI里面采取保存成svg格式的文书,然后用sublime展开svg文件,将path的d拷贝出来就可以。

5,利用上文介绍的完毕动画的法子,大家就足以轻便的获得了下边那些效用。

图片 12

线条动画进级:

可以看来地点的动画效果和作品最先呈现的卡通片效果依旧有分别的,要想完结小说最早的卡通效果,须求用到SVG的<symbol> 和 <use>来兑现,读者能够在网络查一下那三个标签的用法。

XHTML

<symbol id="pathSymbol"> <path class="path" stroke="#00adef" d="M281.221,261.806c0,2.756-2.166,4.922-4.922,4.922l0,0h-33.964c-11.715-24.119-31.503-59.855-47.156-68.026 c-15.751,7.974-35.637,43.907-47.451,68.026h-33.865l0,0c-2.756,0-4.922-2.166-4.922-4.922l0,0l0,0c0-0.295,0-0.689,0.098-0.984 c0,0,14.078-69.109,79.15-129.161c-2.953-2.56-5.907-5.119-8.959-7.58c-1.87-1.575-2.166-4.233-0.591-6.104 c1.575-1.772,4.43-2.166,6.497-0.689c3.347,2.461,6.694,5.218,9.746,8.073c3.15-2.953,6.497-5.71,10.041-8.368 c2.067-1.378,4.922-1.083,6.497,0.689c1.575,1.87,1.28,4.529-0.591,6.104c-3.052,2.56-6.104,5.218-9.155,7.876 c65.27,59.953,79.446,129.161,79.446,129.161C281.221,261.117,281.221,261.412,281.221,261.806L281.221,261.806L281.221,261.806z"/> <path class="path" stroke="#00adef" d="M194.589,212.583h0.984l0,0c19.886,28.451,31.503,54.145,31.503,54.145h-63.99C163.086,266.728,174.703,241.034,194.589,212.583 L194.589,212.583z"/> </symbol> <g> <use xlink:href="#pathSymbol" id="path1"></use> <use xlink:href="#pathSymbol" id="path2"></use> </g>

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<symbol id="pathSymbol">
    <path  class="path" stroke="#00adef"  d="M281.221,261.806c0,2.756-2.166,4.922-4.922,4.922l0,0h-33.964c-11.715-24.119-31.503-59.855-47.156-68.026
  c-15.751,7.974-35.637,43.907-47.451,68.026h-33.865l0,0c-2.756,0-4.922-2.166-4.922-4.922l0,0l0,0c0-0.295,0-0.689,0.098-0.984
  c0,0,14.078-69.109,79.15-129.161c-2.953-2.56-5.907-5.119-8.959-7.58c-1.87-1.575-2.166-4.233-0.591-6.104
  c1.575-1.772,4.43-2.166,6.497-0.689c3.347,2.461,6.694,5.218,9.746,8.073c3.15-2.953,6.497-5.71,10.041-8.368
  c2.067-1.378,4.922-1.083,6.497,0.689c1.575,1.87,1.28,4.529-0.591,6.104c-3.052,2.56-6.104,5.218-9.155,7.876
  c65.27,59.953,79.446,129.161,79.446,129.161C281.221,261.117,281.221,261.412,281.221,261.806L281.221,261.806L281.221,261.806z"/>
    <path  class="path" stroke="#00adef"  d="M194.589,212.583h0.984l0,0c19.886,28.451,31.503,54.145,31.503,54.145h-63.99C163.086,266.728,174.703,241.034,194.589,212.583
L194.589,212.583z"/>
</symbol>
<g>
  <use xlink:href="#pathSymbol"
    id="path1"></use>
    <use xlink:href="#pathSymbol"
      id="path2"></use>
</g>

Sass

#path1 { stroke-dashoffset: 7% 7%; stroke-dasharray: 0 35%; animation: animation 3s linear forwards; } @keyframes animation { 100% { stroke-dasharray: 7% 7%; stroke-dashoffset: 7%; } } #path2 { stroke-dashoffset: 7% 7%; stroke-dasharray: 0 35%; animation: animation2 3s linear forwards; } @keyframes animation2 { 100% { stroke-dasharray: 7% 7%; stroke-dashoffset: 14%; } }

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#path1 {
    stroke-dashoffset: 7% 7%;
    stroke-dasharray: 0 35%;
    animation: animation 3s linear forwards;
  }
  @keyframes animation {
      100% {
        stroke-dasharray: 7% 7%;
        stroke-dashoffset: 7%;
      }
  }
  #path2 {
    stroke-dashoffset: 7% 7%;
    stroke-dasharray: 0 35%;
    animation: animation2 3s linear forwards;
  }
  @keyframes animation2 {
      100% {
          stroke-dasharray: 7% 7%;
          stroke-dashoffset: 14%;
      }
}

思路正是:

1,将本来独有一条path的门道替换成两条,何况这两条的门路是全然重叠的。

2,分别安装两条门路的stroke-dasharray和stroke-dashoffset的css3的animation动画,注意两条路径的动画不能够一心一样要有差值。

3,设置成功之后就足以动用animation动画触发的时机和更动程度来落到实处多条动画效果。

效果:

图片 13

那么哪些兑现alloyteam的文字动画呢,其实原理也是利用了stroke-dasharray和stroke-dashoffset,那多个属性不仅可以够效用在<path>上,一样能够功效在<text>上。

XHTML

<symbol id="text"> <text x="30%" y="35%" class="text">QQ</text> </symbol> <g> <use xlink:href="#text" class="use-text"></use> <use xlink:href="#text" class="use-text"></use> <use xlink:href="#text" class="use-text"></use> <use xlink:href="#text" class="use-text"></use> <use xlink:href="#text" class="use-text"></use> </g>

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  <symbol id="text">
    <text x="30%" y="35%" class="text">QQ</text>
  </symbol>
  <g>
    <use xlink:href="#text"
      class="use-text"></use>
      <use xlink:href="#text"
        class="use-text"></use>
        <use xlink:href="#text"
          class="use-text"></use>
          <use xlink:href="#text"
            class="use-text"></use>
            <use xlink:href="#text"
              class="use-text"></use>
  </g>

Sass

.use-text:nth-child(1) { stroke: #360745; animation: animation1 8s infinite ease-in-out forwards; } .use-text:nth-child(2) { stroke: #D61C59; animation: animation2 8s infinite ease-in-out forwards; } .use-text:nth-child(3) { stroke: #E7D84B; animation: animation3 8s infinite ease-in-out forwards; } .use-text:nth-child(4) { stroke: #EFEAC5; animation: animation4 8s infinite ease-in-out forwards; } .use-text:nth-child(5) { stroke: #1B8798; animation: animation5 8s infinite ease-in-out forwards; } @keyframes animation1 { 50%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 7%; } 70%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 7%; } } @keyframes animation2 { 50%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 14%; } 70%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 14%; } } @keyframes animation3 { 50%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 21%; } 70%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 21%; } } @keyframes animation4 { 50%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 28%; } 70%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 28%; } } @keyframes animation5 { 50%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 35%; } 70%{ stroke-dasharray: 7% 28%; stroke-dashoffset: 35%; } }

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.use-text:nth-child(1) {
      stroke: #360745;
      animation: animation1 8s infinite ease-in-out forwards;
}
          
.use-text:nth-child(2) {
      stroke: #D61C59;
      animation: animation2 8s infinite ease-in-out forwards;
}
          
.use-text:nth-child(3) {
       stroke: #E7D84B;
       animation: animation3 8s infinite ease-in-out forwards;
}
.use-text:nth-child(4) {
       stroke: #EFEAC5;
       animation: animation4 8s infinite ease-in-out forwards;
}
.use-text:nth-child(5) {
      stroke: #1B8798;
      animation: animation5 8s infinite ease-in-out forwards;
}
@keyframes animation1 {
       50%{
            stroke-dasharray: 7% 28%;
            stroke-dashoffset: 7%;
       }
       70%{
             stroke-dasharray: 7% 28%;
             stroke-dashoffset: 7%;
       }
}
@keyframes animation2 {
       50%{
           stroke-dasharray: 7% 28%;
           stroke-dashoffset: 14%;
       }
       70%{
            stroke-dasharray: 7% 28%;
            stroke-dashoffset: 14%;
       }
}
@keyframes animation3 {
     50%{
         stroke-dasharray: 7% 28%;
         stroke-dashoffset: 21%;
    }
    70%{
         stroke-dasharray: 7% 28%;
         stroke-dashoffset: 21%;
    }
}
@keyframes animation4 {
       50%{
            stroke-dasharray: 7% 28%;
            stroke-dashoffset: 28%;
       }
       70%{
            stroke-dasharray: 7% 28%;
            stroke-dashoffset: 28%;
       }
}
@keyframes animation5 {
      50%{
           stroke-dasharray: 7% 28%;
           stroke-dashoffset: 35%;
      }
      70%{
           stroke-dasharray: 7% 28%;
           stroke-dashoffset: 35%;
      }
}

此地用了5条完全重叠的门路,何况每一种路线的颜色和动画片效果都差别等。

效果:

图片 14

 

开启欢畅的svg线条之旅吧!

 

参照他事他说加以考察资料:

1 赞 1 收藏 评论

图片 15

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