Mobile Web Day One

Goal: Use displacement, scaling, rotation, and gradient effects to enrich the presentation of web page elements.

01-Plane conversion

Introduction

Function: Add dynamic effects to elements, generally used in conjunction with transitions

Concept: Change the shape of the box in the plane (displacement, rotation, scaling, tilt)

Plane transformation is also called 2D transformation, and its attribute is transform

Pan

transform: translate(X轴移动距离, Y轴移动距离);

• value
  • Pixel unit value
  • Percentage ( calculated based on the size of the box itself )
  • Either positive or negative
• Skill
  • translate() only writes one value , which means moving along the X axis
  • Set the X or Y axis movement distance individually: translateX() or translateY()

Center positioning

• Method 1: margin

• Method 2: Translation → The percentage is calculated based on the size of the box itself

Case-double door

• HTML structure

<div class="father">
    <div class="left"></div>
    <div class="right"></div>
</div>

• CSS styles

* {
    
    
    margin: 0;
    padding: 0;
}

/* 1. 布局：父子结构，父级是大图，子级是左右小图 */
.father {
    
    
    display: flex;
    margin: 0 auto;
    width: 1366px;
    height: 600px;
    background-image: url(./images/bg.jpg);

    overflow: hidden;
}

.father .left,
.father .right {
    
    
    width: 50%;
    height: 600px;
    background-image: url(./images/fm.jpg);

    transition: all .5s;
}

.father .right {
    
    
    /* right 表示的取到精灵图右面的图片 */
    background-position: right 0;
}

/* 2. 鼠标悬停的效果：左右移动 */
.father:hover .left {
    
    
    transform: translate(-100%);
}

.father:hover .right {
    
    
    transform: translateX(100%);
}

rotate

transform: rotate(旋转角度);

• Value: The unit of angle is deg
• Skill
  • The value can be positive or negative
  • If the value is positive, rotate clockwise
  • If the value is negative, rotate counterclockwise

Transform origin

By default, the transformation origin is the box center point

transform-origin: 水平原点位置 垂直原点位置;

Value:

• Positional nouns (left, top, right, bottom, center)
• Pixel unit value
• percentage

Case-Clock

.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;
}

multiple transformations

Multiple transformation techniques: first translate and then rotate

transform: translate() rotate();

• Principle of multiple transformations: Transform the form based on the coordinate axis of the first transformation method.
  • Rotation will change the coordinate axis of web page elements
  • If you write the rotation first, the axis direction of the subsequent transformation effect will be based on the axis direction after rotation, which will affect the transformation result.

Zoom

transform: scale(缩放倍数);
transform: scale(X轴缩放倍数, Y轴缩放倍数);

• Skill
  • Usually, just set a value for scale(), indicating that the X-axis and Y-axis are scaled equally.
  • A value greater than 1 means zooming in, a value less than 1 means zooming out.

Case-Playback special effects

• CSS styles

/* 1. 摆放播放按钮：图片区域的中间 */
.box li {
    
    
  overflow: hidden;
}

.pic {
    
    
  position: relative;
}

.pic::after {
    
    
  position: absolute;
  left: 50%;
  top: 50%;
  /* margin-left: -29px;
  margin-top: -29px; */
  /* transform: translate(-50%, -50%); */

  content: '';
  width: 58px;
  height: 58px;
  background-image: url(./images/play.png);
  transform: translate(-50%, -50%) scale(5);
  opacity: 0;

  transition: all .5s;
}
/* 2. hover效果：大按钮，看不见：透明是0 → 小按钮，看得见：透明度1 */
.box li:hover .pic::after {
    
    
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

tilt

transform: skew();

Value: angle degree deg

02-Gradient

Gradient is the effect of gradual changes in multiple colors. It is generally used to set the background of a box.

Classification:

• linear gradient
  

• radial gradient

linear gradient

background-image: linear-gradient(
  渐变方向,
  颜色1 终点位置,
  颜色2 终点位置,
  ......
);

Value:

• Gradient direction: optional
  • to directional noun
  • Angle degree
• End position: optional
  • percentage

Case-Product Display

• HTML structure

<div class="box">
  <img src="./images/product.jpeg" alt="" />
  <div class="title">OceanStor Pacific 海量存储斩获2021 Interop金奖</div>
  <div class="mask"></div>
</div>

• CSS styles

.mask {
    
    
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(
      transparent,
      rgba(0,0,0,0.5)
  );
  opacity: 0;

  transition: all .5s;
}

.box:hover .mask {
    
    
  opacity: 1;
}

radial gradient

background-image: radial-gradient(
  半径 at 圆心位置,
  颜色1 终点位置,
  颜色2 终点位置,
  ......
);

Value:

• The radius can be 2, then it is an ellipse
• Value of circle center position: pixel unit value/percentage/orientation noun

03-Comprehensive case

Navigation-Channel

Arrow rotation

.x-header-nav .nav-item:hover .icon-down {
    
    
  transform: rotate(-180deg);
}

Channel list

.channel-layer {
    
    
  position: absolute;
  top: 60px;
  left: 50%;
  z-index: -2;
  width: 1080px;
  height: 120px;
  padding: 10px;
  margin-left: -540px;
  color: #72727b;
  background-color: #f5f5f5;
  border: 1px solid #e4e4e4;
  border-top: none;
  transition: all 0.5s;
  transform: translateY(-120px);
}

/* TODO 2. 弹窗频道 */
.x-header-nav .nav-item:hover .channel-layer {
    
    
  transform: translateY(0);
}

gradient button

search button

.x-header-search form .btn {
    
    
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  background-color: #f86442;
  border-top-right-radius: 20px;
  border-bottom-right-radius: 20px;
  background-image: linear-gradient(
    to right,
    rgba(255, 255, 255, 0.3),
    #f86442
  );
}

Login button

/* TODO 7. 渐变按钮 */
.card .card-info .login {
    
    
  padding: 3px 34px;
  color: #fff;
  background-color: #ff7251;
  border-radius: 30px;
  box-shadow: 0 4px 8px 0 rgb(252 88 50 / 50%);
  background-image: linear-gradient(
    to right,
    rgba(255, 255, 255, 0.2),
    #ff7251
  );
}

client button

/* TODO 8. 径向渐变 */
.download .dl .dl-btn {
    
    
  width: 68px;
  height: 34px;
  line-height: 34px;
  color: #fff;
  text-align: center;
  border-radius: 4px;
  background-image: radial-gradient(
    50px at 10px 10px,
    rgba(255, 255, 255, 0.5),
    transparent
  );
}

carousel

/* TODO 4. 摆放图片 */
.banner .banner-list .banner-item.left {
    
    
  z-index: 0;
  transform: translate(-160px) scale(0.8);
  transform-origin: left center;
}

.banner .banner-list .banner-item.right {
    
    
  z-index: 0;
  transform: translate(160px) scale(0.8);
  transform-origin: right center;
}

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/* TODO 5. 播放按钮和遮罩 */
.album-item .album-item-box::after {
    
    
  position: absolute;
  left: 0;
  top: 0;
  content: '';
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,.5) url(../assets/play.png) no-repeat center / 20px;
  opacity: 0;
  transition: all .5s;
}

.album-item .album-item-box:hover::after {
    
    
  opacity: 1;
  background-size: 50px;
}


/* TODO 6. 图片缩放 */
.album-item .album-item-box:hover img {
    
    
  transform: scale(1.1);
}