How to use CSS and D3 to achieve the effect of endless hexagonal space-CSS Tutorial-php.cn

How to use CSS and D3 to achieve the effect of endless hexagonal space

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Release： 2018-07-28 11:17:10

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This article introduces you to how to use CSS and D3 to achieve the effect of endless hexagonal space. It has a good reference value and I hope it can help friends in need.

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How to use CSS and D3 to achieve the effect of endless hexagonal space

##Code Interpretation

Define dom, the container contains 1 and contains 5

< ;span>'s

:

<p>
    </p><p>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </p>

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Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, gold, black);
}

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Define the dimensions of the circular outer container:

.container {
    width: 20em;
    height: 20em;
    font-size: 20px;
    border-radius: 50%;
}

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Draw a rectangle in the hexagon container:

.hexagons {
    width: inherit;
    height: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hexagons span {
    position: absolute;
    width: calc(20em / 1.732);
    height: inherit;
    background-color: currentColor;
}

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Use pseudo-elements to create 2 more rectangles of the same size, together forming a hexagon:

.hexagons span:before,
.hexagons span:after {
    content: '';
    position: absolute;
    width: inherit;
    height: inherit;
    background-color: currentColor;
}

.hexagons span:before {
    transform: rotate(60deg);
}

.hexagons span:after {
    transform: rotate(-60deg);
}

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Let the hexagons The colors of the shapes are staggered:

.hexagons span:nth-child(odd) {
    color: gold;
}

.hexagons span:nth-child(even) {
    color: #222;
}

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Set the variables so that the hexagons gradually shrink, and the small hexagons overlap the large hexagons:

.hexagons span {
    transform: scale(var(--scale)) ;
}

.hexagons span:nth-child(1) {
    --scale: 1;
}

.hexagons span:nth-child(2) {
    --scale: calc(1 * 0.9);
}

.hexagons span:nth-child(3) {
    --scale: calc(1 * 0.9 * 0.9);
}

.hexagons span:nth-child(4) {
    --scale: calc(1 * 0.9 * 0.9 * 0.9);
}

.hexagons span:nth-child(5) {
    --scale: calc(1 * 0.9 * 0.9 * 0.9 * 0.9);
}

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Set the variables again to make the hexagons smaller The shapes are tilted at different angles in turn:

.hexagons span {
    transform: scale(var(--scale)) rotate(calc(var(--n) * 6deg));
}

.hexagons span:nth-child(1) {
    --n: 1;
}

.hexagons span:nth-child(2) {
    --n: 2;
}

.hexagons span:nth-child(3) {
    --n: 3;
}

.hexagons span:nth-child(4) {
    --n: 4;
}

.hexagons span:nth-child(5) {
    --n: 5;
}

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Define the animation effect:

.hexagons {
    animation: twist 0.5s linear infinite;
}

@keyframes twist {
    from {
        transform: rotate(0deg) scale(1);
    }

    to {
        transform: rotate(calc(6deg * -2)) scale(1.25);
    }
}

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Hide the content outside the container:

.container {
    overflow: hidden;
}

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Next, use d3 to create hexagons in batches.

Introducing the d3 library:

<script></script>

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Use d3 to create a hexagonal dom element:

const COUNT = 5;

d3.select('.hexagons')
    .selectAll('span')
    .data(d3.range(COUNT))
    .enter()
    .append('span');

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Use d3 to assign values to the hexagonal --n and --scale variables:

d3.select('.hexagons')
    .selectAll('span')
    .data(d3.range(COUNT))
    .enter()
    .append('span')
    .style('--scale', (d) => Math.pow(0.9, d))
    .style('--n', (d) => d + 1);

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Delete the hexagonal dom element in the html file and the variables declared in the css file.

Finally, change the number of hexagons to 100:

const COUNT = 100;

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You’re done!

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