Detailed graphic and text explanation of the floating cloud animation effect on the login page using WeChat applet

It goes without saying that WeChat mini programs are currently very popular. Recently, I used my spare time to use a mini program to achieve a dynamic login page effect. Therefore, the following article mainly introduces you to the use of WeChat mini programs to realize cloud floating login page. Relevant information on animation effects, friends in need can refer to it, let’s take a look below.

Preface

In 2017, the front-end became popular, WeChat mini-programs, weex, reactnative, and even Alipay also launched mini-programs. Program, I always feel that this is the rhythm of the original destruction, I will also take advantage of the heat to get on board in case of a wave.

Last rendering (GIF animation)

When I saw this background picture, I immediately felt obsessive-compulsive disorder I wondered why the clouds didn't move, so a wave of trouble began.

Knowledge points

Understanding animation

animation Property is a shorthand property for setting six animation properties:

Value	Description
animation-name	Specifies the keyframe name that needs to be bound to the selector
animation-duration	Specifies the time it takes to complete the animation, Measured in seconds or milliseconds
animation-timing-function	Specifies the speed curve of the animation
animation-delay	Specifies the delay before the animation starts
animation-iteration-count	Specifies the number of times the animation should play
animation-direction	Specifies whether animation should be played in reverse in turn

Get to know There are many methods to translate

. This article mainly uses two.

• translate3d(x,y,z)Define 3D scaling transformation.

• rotate3d(x,y,z,angle) Define 3D rotation.

translate3d(1,1,0)


You can understand it as (left and right, up and down, size) changes.

rotate3d(1,1,0,45deg)

##Implementation

#1. The two clouds are the same except for their size and initial position.

.cloud {
 position: absolute;
 z-index: 3;
 width:99px;height:64px; top: 0; 
 right: 0;
 bottom: 0;
 animation: cloud 5s linear infinite;
}

@keyframes cloud {
 from {
 transform: translate3d(-125rpx, 0, 0);
 }

 to {
 transform: translate3d(180rpx, 0, 0);
 }
}

Among them, rpx is a unique attribute of WeChat and is not affected by the screen size, similar to the dp unit in Android. Keyframes move at a constant speed. From the css, you can see that only the left and right directions are changed.

2. I originally wanted to add a hanging basket to the avatar to make it swing like a swing, but I didn't succeed. I just made a random animation of floating around.

The code is as follows

@keyframes pic {
 0% {
 transform: translate3d(0, 20rpx, 0) rotate(-15deg);
 }
 15% {
 transform: translate3d(0, 0rpx, 0) rotate(25deg);
 }
 36% {
 transform: translate3d(0, -20rpx, 0) rotate(-20deg);
 }
 50% {
 transform: translate3d(0, -10rpx, 0) rotate(15deg);
 }
 68% {
 transform: translate3d(0, 10rpx, 0) rotate(-25deg);
 }
 85% {
 transform: translate3d(0, 15rpx, 0) rotate(15deg);
 }
 100% {
 transform: translate3d(0, 20rpx, 0) rotate(-15deg);
 }
}

I didn’t expect that keyframes not only support from to but also percentage, which is good. Here, as long as you control the hierarchical relationship, animation duration, and transparency, you can achieve cloud floating.

Summary

I have to say that CSS still has a lot of animations and a lot of special effects. Adding a little animation to the WeChat applet can make the page a little bit lighter. beauty point of view. Of course, more complex animations can only be

updated when given the opportunity.

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