Implementation method of water polo effect and rotation special effects developed in PHP in WeChat mini program

With the rapid development of mobile Internet, WeChat has become one of the indispensable communication tools in our daily lives. As one of the most popular social media, WeChat has quickly become popular all over the world in a short period of time, attracting the attention of hundreds of millions of users. As one of the important application scenarios of WeChat, WeChat applet has also been supported by more and more developers and users.

In the development of WeChat mini programs, the technologies involved include JavaScript, CSS, HTML and other front-end technologies, as well as back-end technologies such as PHP. Among them, PHP is an object-oriented server-side scripting language, which can help us implement server-side data processing and interact with the database. In WeChat mini programs, PHP can help us achieve various interesting effects, such as water balloon effects and rotation effects. Below, we will introduce how to use PHP to achieve these effects.

1. Water Polo Effect

The water polo effect is an interesting animation effect that allows users to get a better interactive experience when viewing the page. In the WeChat applet, JavaScript and CSS can be used to achieve the water polo effect. Here are some simple steps:

1. Create a container element in HTML. We can set a width and height to this element to make it a circular container.
2. Set a background color to the container element, such as blue, and then use the CSS border-radius property to turn the container element into a circle.
3. Use JavaScript to create an object. This object will have properties that represent the progress of the water polo, such as progress.
4. When the user scrolls the page, use JavaScript to calculate the current progress value and assign it to the progress attribute. Then use the CSS clip-path property to clip off the upper half of the water ball, leaving only the lower half to achieve the water ball effect.

The specific code implementation is as follows:

HTML code:

<div class="water-ball">
    <div class="water"></div>
</div>

CSS code:

.water-ball {
  width: 200px;
  height: 200px;
  background-color: blue;
  border-radius: 50%;
  overflow: hidden;
}

.water {
  width: 100%;
  height: 200px;
  background-color: #fff;
  border-radius: 50%;
  position: relative;
  animation: water 1s infinite ease-in-out;
}

@keyframes water {
  0% {
    top: 0;
  }
  50% {
    top: 10px;
  }
  100% {
    top: 0;
  }
}

JavaScript code:

var water = {
    progress: 0,
    setProgress: function(progress) {
        this.progress = progress;
        $('.water').css('clip-path', 'polygon(0 ' + (200 - this.progress) 
        + 'px, 100% ' + (200 - this.progress) + 'px, 100% 100%, 0 100%)');
    }
}

$(window).scroll(function() {
    var scrollTop = $(this).scrollTop();
    var windowHeight = $(this).height();
    var documentHeight = $(document).height();
    var progress = 0;
    if (scrollTop + windowHeight >= documentHeight) {
        progress = 200;
    } else {
        progress = (scrollTop + windowHeight) / documentHeight * 200;
    }
    water.setProgress(progress);
});

2. Rotation special effect

The rotation special effect is another interesting animation effect, which can make the page more vivid and interesting. In WeChat mini programs, JavaScript and CSS can also be used to achieve rotation effects. The following are the steps to implement the rotation effect:

1. Create a container element in HTML and place the content that needs to be rotated into it.
2. Set the position attribute of the container element to relative in CSS, and set the transform-origin attribute of the content that needs to be rotated so that it can be rotated at the center point.
3. Use JavaScript to control the rotation effect, set a timer, and use the CSS transform attribute in the timer callback function to achieve rotation.

The specific code implementation is as follows:

HTML code:

<div class="rotate-wrapper">
    <div class="rotate-item"></div>
</div>

CSS code:

.rotate-wrapper {
  width: 200px; 
  height: 200px;
  position: relative;
}

.rotate-item {
  width: 60px;
  height: 60px;
  background-color: #f00;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -30px;
  margin-left: -30px;
  border-radius: 50%;
  transform-origin: center center;
  animation: rotate 2s infinite linear;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

JavaScript code:

var deg = 0;

setInterval(function() {
    deg += 1;
    $('.rotate-item').css('transform', 'rotate(' + deg + 'deg)');
}, 10);

Summary:

In this article, we introduced how to use PHP to implement the water ball effect and rotation special effects in the WeChat applet. These effects not only allow developers of WeChat mini programs to obtain better visual effects, but also provide users with a better interactive experience and increase the usage of mini programs. I hope this article will be helpful to beginners, and everyone is welcome to explore and research in depth in actual combat.

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