1、平面转换-旋转
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
img {
width: 200px;
transition: all 2s;
}
/* 鼠标悬停到图片上面，添加旋转效果 */
img:hover {
/* 正数：顺时针旋转； 负数：逆时针旋转 */
transform: rotate(360deg);
transform: rotate(-360deg);
}
</style>
</head>
<body>
<img src="../photo/1.jpg" alt="">
</body>
</html>2、平面旋转-改变转换原点
默认情况下，转换原点是盒子中心点
取值
- 方位名词（left、top、right、bottom、center）
- 像素单位数值
- 百分比
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
img {
width: 200px;
border: 1px solid #000;
transition: all 1s;
transform-origin: right bottom;
}
img:hover {
transform: rotate(360deg);
}
</style>
</head>
<body>
<img src="../photo/1.jpg" alt="">
</body>
</html>3、案例 时钟
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
.clock {
width: 250px;
height: 250px;
border: 8px solid #000;
border-radius: 50%;
margin: 100px auto;
position: relative;
}
.line {
/* 1.定位 */
position: absolute;
width: 4px;
height: 250px;
background-color: #999;
left: 50%;
transform: translate(-50%);
}
/* 线2: 旋转, 每条线旋转角度不同, 单独选中不同的line, 写rotate代码 */
/* 一圈是360度, 等分成 xx 份 */
.line:nth-child(2) {
transform: translate(-50%) rotate(30deg);
}
.line:nth-child(3) {
transform: translate(-50%) rotate(60deg);
}
.line:nth-child(4) {
transform: translate(-50%) rotate(90deg);
}
.line:nth-child(5) {
transform: translate(-50%) rotate(120deg);
}
.line:nth-child(6) {
transform: translate(-50%) rotate(150deg);
}
/* 第一根和第四跟宽度大一些 */
.line:nth-child(1),
.line:nth-child(4) {
width: 5px;
}
/* 遮罩圆形 */
.cover {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 200px;
height: 200px;
background-color: #fff;
border-radius: 50%;
}
/* 表针 */
/* 并集选择器放在单独选择器的上面, 避免transform属性的层叠 */
.hour,
.minute,
.second {
position: absolute;
left: 50%;
/* 盒子底部在盒子中间 */
bottom: 50%;
}
.hour {
width: 6px;
height: 50px;
background-color: #333;
margin-left: -3px;
transform: rotate(15deg);
transform-origin: center bottom;
}
.minute {
width: 5px;
height: 65px;
background-color: #333;
margin-left: -3px;
transform: rotate(90deg);
transform-origin: center bottom;
}
.second {
width: 4px;
height: 80px;
background-color: red;
margin-left: -2px;
transform: rotate(240deg);
transform-origin: center bottom;
}
/* 螺丝 */
.dotted {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 18px;
height: 18px;
background-color: #333;
border-radius: 50%;
}
</style>
</head>
<body>
<div class="clock">
<!-- 刻度线 -->
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<!-- 遮罩圆形 -->
<div class="cover"></div>
<!-- 表针 -->
<div class="hour"></div>
<div class="minute"></div>
<div class="second"></div>
<!-- 螺丝 -->
<div class="dotted"></div>
</div>
</body>
</html>
