javascript - 基于时间的动画背景
问题描述
我这里有一些代码可以动画一整天（从日出到日落）：（演示）
我很想知道是否有可能让它变得更加动态，这样动画就会随着一天中的时间而移动。
例如：如果是中午，太阳应该在天空的最高点。相反，如果是午夜，月亮将在天空中的最高点。
我怀疑它可以用几行javascript来完成：
<script type="text/javascript">
var currentTime = new Date().getHours();
if (document.html) {
'''psuedo_code'''
while true
for hour in day
move sun and moon according to currentTime
}
</script>
HTML 和 CSS：
<html>
<div class="canvas">
<div class="cloud"></div>
<div class="cloud a"></div>
<div class="cloud b"></div>
<div class="cloud c"></div>
<div class="land">
<div class="tree"></div>
<div class="tree a"></div>
<div class="tree b"></div>
<div class="tree c"></div>
<div class="tree d"></div>
</div>
<div class="star"></div>
<div class="star a"></div>
<div class="star b"></div>
<div class="star c"></div>
<div class="star d"></div>
<div class="wind"></div>
<!-- <div class="swirly-wind">
<span></span>
<span></span>
<span></span>
</div>
<div class="swirly-wind a"></div>
<div class="swirly-wind b"></div> -->
<div class="eclipse">
<div class="sun"></div>
<div class="sun a"></div>
<div class="moon"></div>
<div class="moon a"></div>
</div>
</div>
</html>
<style>
/*body {
position: relative;
}*/
.canvas {
width: 600px;
height: 600px;
border: 1px solid #000;
margin: 0 auto;
position: relative;
animation-delay: 1s;
background: #70c4c6;
animation-name: daylight;
animation-duration: 20s;
animation-iteration-count: infinite;
overflow: hidden;
animation-timing-function: linear;
}
.eclipse {
width: 600px;
height: 600px;
/*border: 1px solid #000;*/
position: absolute;
left:60%;
top:20%;
animation-name: time;
animation-duration: 40s;
animation-iteration-count: infinite;
z-index: 0;
animation-timing-function: linear;
}
.sun {
width:70px;
height:70px;
border-radius: 50%;
background-color: #ffa;
position: absolute;
top: -35px;
left: -35px;
}
.sun.a {
bottom: -35px;
right: -35px;
left: auto;
top:auto;
}
.moon {
position: absolute;
top: -35px;
right: -35px;
width:70px;
height:70px;
border-radius: 50%;
background-color: #fff;
}
.moon.a {
bottom: -35px;
left: -35px;
top:auto;
right: auto;
}
.cloud {
width: 50px;
height: 45px;
border-radius: 50%;
background-color: #fff;
position: absolute;
top:20px;
left: -20%;
animation-name: cloud;
animation-duration: 70s;
animation-iteration-count: infinite;
z-index: 1;
}
.cloud::before {
content:'';
width: 35px;
height: 30px;
background-color: #fff;
margin-left: -20px;
margin-top: 10px;
display: block;
border-radius: 50%;
}
.cloud::after {
content:'';
width: 20px;
height: 20px;
background-color: #fff;
position: absolute;
right: -10px;
top: 17px;
border-radius: 50%;
}
.cloud.a {
top:150px;
animation-duration: 55s;
}
.cloud.b {
top:100px;
left:-15%;
animation-duration: 38s;
}
.cloud.c {
top:250px;
left:-10%;
animation-duration: 25s;
}
.land {
width: 100%;
height: 320px;
position: absolute;
left:-50px;
bottom: -120px;
background-color: #83a81c;
border-radius: 50%;
z-index: 1;
animation-name: land;
animation-duration: 20s;
animation-iteration-count: infinite;
}
.land::before {
width: 100%;
height: 200px;
content: '';
position: absolute;
left: 40%;
top: 20%;
border-radius: 50%;
background-color: #96be29;
transform: rotate(-15deg);
animation-name: land1;
animation-duration: 20s;
animation-iteration-count: infinite;
}
.tree {
width:10px;
height:40px;
background-color: #766257;
left: 200px;
position: absolute;
}
.tree::before {
content: '';
position: absolute;
bottom: 125%;
left: -7px;
width: 0;
height: 0;
border-style: solid;
border-width: 0 20px 43px 20px;
border-color: transparent transparent #bfde3b transparent;
z-index: 1;
animation-name: windy;
animation-duration: 5s;
animation-iteration-count: infinite;
}
.tree::after {
content: '';
position: absolute;
bottom:100%;
left:-25px;
width: 0;
height: 0;
border-style: solid;
border-width: 0 30px 60px 30px;
border-color: transparent transparent #93ae29 transparent;
}
.tree.a {
transform: scale(0.5);
left: 250px;
}
.tree.b {
transform: scale(0.75);
left: 280px;
}
.tree.c {
transform: scale(1.5);
left:450px;
top: 100px;
}
.tree.d {
transform: scale(1.25);
left: 530px;
top: 80px;
z-index: 0;
}
.star {
width: 4px;
height: 4px;
border-radius: 50%;
background-color: #fff;
position: absolute;
top: 50px;
left: 100px;
animation-name: fader;
animation-duration: 20s;
animation-iteration-count: infinite;
}
.star::before {
content: '';
width:3px;
height:3px;
border-radius: 50%;
background-color: #fff;
position: absolute;
left:20px;
top:20px;
animation-name: blinker;
animation-duration: 20s;
animation-iteration-count: infinite;
}
.star::after {
content: '';
width:2px;
height:2px;
border-radius: 50%;
background-color: #fff;
position: absolute;
left:-200px;
top:50px;
animation-name: blinker;
animation-duration: 20s;
animation-iteration-count: infinite;
}
.star.a {
top:30px;
left:90%;
}
.star.b {
top:120px;
left:70%;
}
.star.c {
top:100px;
left:65%;
}
.star.d {
top:200px;
left:15%;
}
.swirly-wind {
position: absolute;
top:30%;
animation-name: wind;
animation-duration: 12s;
animation-iteration-count: infinite;
animation-timing-function: linear;
}
.swirly-wind > span {
width: 150px;
background-color: #eee;
height: 2px;
display: block;
position: relative;
}
.swirly-wind > span:first-child {
width: 200px;
}
.swirly-wind > span:nth-child(1)::before {
display: none;
}
.swirly-wind > span:nth-child(2) {
margin-top: -10px;
float: right;
}
.swirly-wind > span:nth-child(3) {
margin-top: 15px;
width: 75px;
float: right;
}
.swirly-wind span::before {
content: '';
position: absolute;
width: 30px;
height: 30px;
border-radius: 50%;
border: #fff 2px solid;
bottom: calc(100% - 2px);
right: -15px;
-webkit-clip-path: polygon(100% 0, 100% 100%, 50% 100%, 0 0);
clip-path: polygon(100% 0, 100% 100%, 50% 100%, 0 0);
}
.swirly-wind > span:nth-child(3)::before {
top: calc(100% - 2px);
-webkit-clip-path: polygon(100% 0, 100% 100%, 14% 100%, 35% 0);
clip-path: polygon(100% 0, 100% 100%, 14% 100%, 35% 0);
}
.swirly-wind.a {
top:20%;
width: 75px;
animation-duration: 8s;
}
.swirly-wind.b {
top:45%;
width: 120px;
animation-duration: 15s;
height :1px;
}
.swirly-wind.b::before {
border: #fff 1px solid;
bottom: calc(100% - 1px);
}
.wind {
width: 150px;
background-color: #eee;
height: 2px;
position: absolute;
top:30%;
animation-name: wind;
animation-duration: 8s;
animation-iteration-count: infinite;
animation-timing-function: linear;
}
.wind::before {
content: '';
position: absolute;
left: 200px;
width: 100px;
height: 1px;
background-color: #eee;
top:100px;
}
.wind::after {
content: '';
position: absolute;
left: 400px;
width: 180px;
height: 1px;
background-color: #eee;
top:30px;
}
@keyframes time {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
@keyframes daylight {
0% { background-color: #70c4c6; }
15% { background-color: #524b64; }
40% { background-color: #354a4a; }
70% { background-color: #354a4a; }
80% { background-color: #e2b553; }
100% { background-color: #70c4c6;}
}
@keyframes land {
40% { background-color: #4d6932; }
70% { background-color: #4d6932;}
}
@keyframes land1 {
40% { background-color: #5b793e; }
70% { background-color: #5b793e;}
}
@keyframes cloud {
0% { transform: translateX(0); }
100% { transform: translateX(850px); }
}
@keyframes rotate {
0% { transform: rotate(0); }
100% { transform: rotate(360deg); }
}
@keyframes fader {
0% { opacity: 0; }
15% { opacity: 0; }
40% { opacity: 1; }
60% { opacity: 0.4; }
70% { opacity: 1; }
80% { opacity: 0; }
100% { opacity: 0; }
}
@keyframes blinker {
0% { opacity: 0; }
18% { opacity: 0; }
25% { opacity: 1; }
40% { opacity: 0; }
60% { opacity: 1; }
70% { opacity: 0; }
100% { opacity: 0; }
}
@keyframes blinker-1 {
0% { opacity: 0; }
30% { opacity: 0; }
40% { opacity: 1; }
60% { opacity: 1; }
80% { opacity: 0; }
100% { opacity: 0; }
}
@keyframes windy {
15% { transform: translateX(5px); transform: rotate(5deg); }
80% { transform: translateX(7px); transform: rotate(7deg);}
80% { transform: translateX(5px); transform: rotate(5deg);}
}
@keyframes wind {
0% { left: -800px; opacity: 0 }
15% { opacity: 1; }
70% { left: 800px; opacity: 1;}
80% { left: 800px; opacity: 0;}
100% { left: -1000px; opacity: 0;}
}
@keyframes snowday {
0% {
top: 0;
}
100% {
top: 100%;
}
}
.snow {
width: 10px;
height: 10px;
border-radius: 50%;
background-color: #fff;
position: absolute;
top: 0;
}
.snow.fall {
animation-name: snowday ;
animation-duration: 5s;
}
</style>
解决方案
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