做一个太阳系八大行星的运转动画,不包括行星的卫星,所有行星围绕太阳公转,行星采用纯色,暂时没有自转。
效果静态图:
动画中包括:太阳及各行星,运行轨道,行星公转动画。
先画好草图,设计好大小和位置,根据公转周期计算好动画执行的时间。
html的结构:
一个class为solarsys的div,作为太阳系容器元素,该div的position为relative。
行星轨道和行星都用div,position为absolute。
容器用relative和内部元素采用absolute的定位方式,比较简单的能实现效果,缺点就是大小是固定的。
<div class="solarsys"> <!--太阳--> <div class='sun'></div> <!--水星轨道--> <div class='mercuryOrbit'></div> <!--水星--> <div class='mercury'></div> <!--金星轨道--> <div class='venusOrbit'></div> <!--金星--> <div class='venus'></div> <!--地球轨道--> <div class='earthOrbit'></div> <!--地球--> <div class='earth'></div> <!--火星轨道--> <div class='marsOrbit'></div> <!--火星--> <div class='mars'></div> <!--木星轨道--> <div class='jupiterOrbit'></div> <!--木星--> <div class='jupiter'></div> <!--土星轨道--> <div class='saturnOrbit'></div> <!--土星--> <div class='saturn'></div> <!--天王星轨道--> <div class='uranusOrbit'></div> <!--天王星--> <div class='uranus'></div> <!--海王星轨道--> <div class='neptuneOrbit'></div> <!--海王星--> <div class='neptune'></div> </div>
太阳系容器div的css:
定宽,定高,relative定位,页面内剧中对齐。
.solarsys{ width: 800px; height: 800px;; position: relative; margin: 0 auto; background-color: #000000; padding: 0; transform: scale(1); }
太阳div的css:
按照设计的大小和位置,设定宽高,left,top。
设定颜色。
通过把boder-radius生成50%,把一个正方形变成圆形。
通过box-shadow的4层颜色设置实现太阳光晕。
.sun { left:357px; top:357px; height: 90px; width: 90px; background-color: rgb(248,107,35); border-radius: 50%; box-shadow: 5px 5px 10px rgb(248,107,35), -5px -5px 10px rgb(248,107,35), 5px -5px 10px rgb(248,107,35), -5px 5px 10px rgb(248,107,35); position: absolute; margin: 0; }
行星轨道div的css:
假设是水星轨道。
按照设计的大小和位置,设定宽高,left,top。
背景色透明。
通过把boder-radius生成50%,把一个正方形变成圆形。
boder的类型设成虚线。
boder的颜色设成灰色。
宽度设1。
.mercuryOrbit { left:342.5px; top:342.5px; height: 115px; width: 115px; background-color: transparent; border-radius: 50%; border-style: dashed; border-color: gray; position: absolute; border-width: 1px; margin: 0px; padding: 0px; }
行星div的css:
假设是水星。
按照设计的大小和位置,设定宽高,left,top。
设置颜色。
通过把boder-radius生成50%,把一个正方形变成圆形。
将transfrom-origin设定成当前div的左上角相对于整个太阳系容器的中心点的横向和纵向的偏移量。加上旋转动画后就是围绕着中心点旋转效果。
做一个animation,引用rotate关键帧动画,线性永久执行,这里的执行时长是根据行星的公转周期计算出来。
.mercury { left:337.5px; top:395px; height: 10px; width: 10px; background-color: rgb(166,138,56); border-radius: 50%; position: absolute; transform-origin: 62.5px 5px; animation: rotate 1.5s infinite linear; }
rotate关键帧动画:
逆时针旋转。
@keyframes rotate { 100% { transform: rotate(-360deg); } }
基本结构完成。
仅在chrome中测试过。
全部代码:
<div class="solarsys"> <!--太阳--> <div class='sun'></div> <!--水星轨道--> <div class='mercuryOrbit'></div> <!--水星--> <div class='mercury'></div> <!--金星轨道--> <div class='venusOrbit'></div> <!--金星--> <div class='venus'></div> <!--地球轨道--> <div class='earthOrbit'></div> <!--地球--> <div class='earth'></div> <!--火星轨道--> <div class='marsOrbit'></div> <!--火星--> <div class='mars'></div> <!--木星轨道--> <div class='jupiterOrbit'></div> <!--木星--> <div class='jupiter'></div> <!--土星轨道--> <div class='saturnOrbit'></div> <!--土星--> <div class='saturn'></div> <!--天王星轨道--> <div class='uranusOrbit'></div> <!--天王星--> <div class='uranus'></div> <!--海王星轨道--> <div class='neptuneOrbit'></div> <!--海王星--> <div class='neptune'></div> </div>

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HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.

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