How to write arc and sector loading animation?
0. Static renderings
##1. Code for drawing arcs
width: 3em; height: 3em; border: 7px transparent solid; border-left: 7px #4DB6AC solid; border-radius: 50%;
* Here is another way
border-left:7px #4DB6AC solid; border-radius: 50%; border-top:7px transparent solid; border-bottom:7px transparent solid;
2. The code for drawing a fan shape
border: 7px transparent solid; border-left: 7px #4DB6AC solid; border-radius: 50%;
* The width and length cannot be defined when drawing a sector, the rest is the same as drawing an arc
##3.less encapsulates the code for drawing arcs and sectors
.arc(@direction,@style){
@color:~`"@{style}".split(/,\s+/)[1]`;
@width:~`"@{style}".split(/,\s+/)[0].replace("[","")`;
@shape:~`"@{style}".split(/,\s+/)[2].replace("]","")`;
border: @width transparent @shape;
@length:length(@direction);
.setStyle(@length,@style,@direction);
border-radius: 50%;
.setStyle(@length,@style,@direction) when (@length>0){
@index:@length - 1;
@pos:extract(@direction,@length);
border-@{pos}:@style ;
.setStyle(@index,@style,@direction);
}
}
//使用方式:
@driection 可以是top、left、right、bottom中的一个或多个
@style 需要严格按照 7px solid red 这样的顺序
.arc(left,7px solid red);
.arc(left top,7px solid red);
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style> html,body { overflow: hidden; width: 100%; height: 100%;}.container { display: -webkit-box; display: -ms-flexbox; display: flex; -ms-flex-wrap: wrap; flex-wrap: wrap; -webkit-box-pack: space-around; -ms-flex-pack: space-around; justify-content: space-around; margin: 0 auto; max-width: 650px; min-width: 200px;}.container .canvas { -webkit-box-align: center; -ms-flex-align: center; align-items: center; display: -webkit-box; display: -ms-flexbox; display: flex; -webkit-box-pack: center; -ms-flex-pack: center; justify-content: center; background: #eee; border-radius: 50%; -webkit-box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2); box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2); height: 10em; width: 10em; margin: 1em 1em 2em 1em;}.container .canvas .spinner4 { width: 3em; height: 3em; border: 7px transparent solid; border-left: 7px #4DB6AC solid; border-radius: 50%; -webkit-animation: spinner4 1s linear infinite; animation: spinner4 1s linear infinite;}@-webkit-keyframes spinner4 { 100% {
-webkit-transform: rotate(360deg);-ms-transform: rotate(360deg);-o-transform: rotate(360deg);transform: rotate(360deg); }}
@keyframes spinner4 { 100% {
-webkit-transform: rotate(360deg);-ms-transform: rotate(360deg);-o-transform: rotate(360deg);transform: rotate(360deg); }}
.container .canvas .spinner5 { border: 1.5em transparent solid; border-right: 1.5em #4DB6AC solid; border-left: 1.5em #4DB6AC solid; border-radius: 50%; -webkit-animation: spinner5 1s linear infinite; animation: spinner5 1s linear infinite;}@-webkit-keyframes spinner5 { 0% {
transform: rotate(0deg); } 50% {transform: rotate(60deg); } 100% {transform: rotate(360deg); }}
@keyframes spinner5 { 0% {
transform: rotate(0deg); } 50% {transform: rotate(60deg); } 100% {transform: rotate(360deg); }}
.container .canvas .spinner6 { width: 1em; height: 1em; border-radius: 50%; background-color: #4db6ac; margin: 0.1em; -webkit-animation: fall 1s linear infinite; animation: fall 1s linear infinite;}
</style></head><body><div class="container"><div class="canvas"><div class="spinner4"></div></div><div class="canvas"><div class="spinner5"></div></div></div></body></html>
The case code is what I saw on the Internet. I imitated it myself, but the effect and method are not as good as the former.
It is gratifying to know the principle, but the details still need practice.
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