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Animating a rainbow heart from a square using CSS?

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2023-09-09 09:01:02583browse

使用 CSS 从正方形制作彩虹心动画？

We can create animations using HTML, CSS and JavaScript together and implement these animations on a web page or website. CSS provides many properties that we can use to create animations, which is why it is recommended to use CSS for styling as it provides powerful features for front-end development.

In this article, we will use CSS to create a heart shape that changes color every 3 seconds and do it in two steps using some animation.

Steps to Create a Rainbow Heart

We will create two different parts for the body and then create two classes, one of which is the square and the other is the container. We'll also create a CSS section where we'll add some properties to the body and center everything we want to display. We will use the following code to create the container.

Example

In the example below, we have added some properties and created a heart shape that the animation will play in. The code below gives the output of HTML and CSS code. 

<!DOCTYPE html>
<html lang="en">
<head>
   <title>Creating the container</title>
   <style>
      .contain {
         display: grid;
         height: 99vh;
         place-items: center;
      }
      .sqr {
         height: 9rem;
         width: 9rem;
         background-color: blue;
         transform: rotate(45deg);
      }
      .sqr::before {
         content: "";
         height: 100%;
         width: 99%;
         background-color: red;
         position: absolute;
         transform: translateY(-50%);
         border-radius: 49%;
      }
      .sqr::after {
         content: "";
         background-color: lightgreen;
         position: absolute;
         width: 99%;
         height: 99%;
         transform: translateX(-49%);
         border-radius: 50%;
      }
   </style>
</head>
<body>
   <div class="contain">
      <div class="sqr"></div>
   </div>
</body>
</html>

The circles now have different colors, we keep it that way so we can differentiate the circles.

Now, we will animate this heart. To do this we will add movement to the heart and then use keyframe properties to change the color. The color of the heart will change every time a new frame appears.

The movement of the created heart will change to form a square, and then change back to form a heart. We'll do this by using the transform property so that the square can transform into a heart shape. Now we have discussed the method.

Example

In the code below, we first use the same code we used to make the container and heart shapes, and then add some keyframes where we set the color from 0% to 100%. The color of each keyframe changes so that the square appears to change into a heart shape. Let's take a look at the output so we understand what happens after using the code. 

<!DOCTYPE html>
<html lang="en">
<head>
   <title>Creating the container</title>
   <style>
      .contain {
         display: grid;
         height: 99vh;
         place-items: center;
      }
      .sqr {
         height: 9rem;
         width: 9rem;
         background-color: grey;
         transform: rotate(45deg);
         animation: beater 3s linear infinite;
      }
      .sqr::before {
         content: "";
         height: 100%;
         width: 99%;
         background-color: maroon;
         position: absolute;
         transform: translateY(-50%);
         border-radius: 49%;
         animation: beater 3s linear infinite;
      }
      .sqr::after {
         content: "";
         background-color: yellow;
         position: absolute;
         width: 99%;
         height: 99%;
         transform: translateX(-49%);
         border-radius: 50%;
         animation: beater 3s linear infinite;
      }
      @keyframes beater {
         0% {
            background: red;
         }
         15% {
            background: orange;
         }
         30% {
            transform: scale(0.5);
            background: yellow;
         }
         45% {
            background: greenyellow;
         }
         60% {
            background: blue;
         }
         75% {
            background: indigo;
         }
         100% {
            background: violet;
         }
      }
   </style>
</head>
<body>
   <div class="contain">
      <div class="sqr"></div>
   </div>
</body>
</html>

Initially our output will look like this, a square, then in every frame it will create the illusion that the square is transforming into a heart shape, then after the transformation it will loop again and become a square, Each frame will turn into a different color as the frame changes. A complete heart looks like this.

Finally, we can see a complete heart from the square.

in conclusion

Animations in websites are very common these days, and these animations determine the actual look and feel of the website. The purpose of these animations is usually to engage the user or make it easy for the user to understand something. CSS is a very powerful tool that allows you to create these animations with just a few lines of code. Animations contain frames between them and we use the keyframe property in CSS to change the frames.

In this article we learned how to create an animated rainbow heart from a square using CSS that changes color every 3 seconds.

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