How to use CSS and D3 to implement interactive animation of small fish swimming (with code)

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Effect preview

Source code download

https://github.com/comehope/front- end-daily-challenges

Code Interpretation

Define dom, the sub-elements contained in the container represent the body, eyes, dorsal fin and tail of the fish respectively:

Set page style For full screen and no scroll bars:

body { margin: 0; width: 100vw; height: 100vh; background-color: #222; overflow: hidden; }

Define the container size of the fish,--ris a basic size unit, and all subsequent sizes are calculated based on it:

.fish { position: absolute; --r: 15vw; width: calc(var(--r) + var(--r) / 3); height: calc(var(--r) * 2); left: 50%; top: 100px; }

Draw the body of the fish, and declare the color of the fish to the parent class, because this color will be used below:

.fish { color: hsl(0, 50%, 50%); } .fish .body { position: absolute; border: var(--r) solid transparent; border-right-color: currentColor; border-left-style: none; }

Draw the eyes of the fish:

.fish .eye { position: absolute; --r1: calc(var(--r) / 4); width: var(--r1); height: var(--r1); background-color: #111; border-radius: 50%; top: 35%; left: 30%; }

Draw The dorsal fin of the fish:

.fish .fin { position: absolute; --r2: calc(var(--r) / 2); border-bottom: var(--r2) solid; border-left: var(--r2) solid transparent; filter: brightness(2.5); left: calc(var(--r) - var(--r2)); }

Draw the tail of the fish:

.fish .tail { position: absolute; --r3: calc(var(--r) / 3); border: var(--r3) solid transparent; border-right-color: currentColor; border-left-style: none; right: 0; top: calc(var(--r) - var(--r3)); }

Add the animation effect for the fish to swim, not to execute it in a loop, but only once:

.fish { right: calc(var(--r) * -1); animation: run 3s linear forwards; } @keyframes run { to { right: 100%; } }

Then add the animation effect of the swaying of the fish when swimming:

.fish { animation: run 3s linear forwards, shake 0.3s linear infinite; } @keyframes shake { 50% { transform: rotateY(-30deg); } 100% { transform: rotateY(30deg); } }

Next, set some variables to create different-looking fish:

Variables for the size of the fish--size, the larger the value, the larger the size:

.fish { --size: 5; --r: calc(var(--size) * 1vw); }

The color variable of the fish--color, indicating the angle of the hue circle:

.fish { --color: 0; color: hsl(var(--color), 50%, 50%); }

The fish swims from the right to the left The duration on the side, the shorter the duration, the faster the fish swims:

.fish { --duration: 3; animation: run calc(var(--duration) * 1s) linear forwards, shake 0.3s linear infinite; }

The height at which the fish appears, the larger the data, the closer it is to the lower part of the page:

.fish { --top: 100; top: calc(var(--top) * 1px); }

Next, use d3 to batch process dom elements and css variables .
Introduce the d3 library:

Delete the.fishelement in the html and the variable declaration code in the css file. Create a function that generates a fish. The values of css variables are randomly generated. The value range of--sizeis 5 ~ 8, the value range of--coloris -60 ~ 15,- The value range of -durationis 3 ~ 6, the value range of--topis 100 ~ 300:

function buildFish() { let fish = d3.select('body') .append('p') .attr('class', 'fish') .style('--size', d3.randomUniform(5, 8)()) .style('--color', d3.randomUniform(-60, 15)()) .style('--duration', d3.randomUniform(3, 6)()) .style('--top', d3.randomUniform(100, 300)()); fish.append('span').attr('class', 'body'); fish.append('span').attr('class', 'eye'); fish.append('span').attr('class', 'fin'); fish.append('span').attr('class', 'tail'); }

binds the mouse click event. When the mouse is pressed A fish is generated when the It goes blank after loading:

function buildFish(e) { //略.... .style('--top', e.clientY); } window.addEventListener('click', buildFish);

Done!

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