How to use CSS and D3 to achieve dynamic effects of spaceships-CSS Tutorial-php.cn

This article introduces to you how to use CSS and D3 to achieve the dynamic effect of a spaceship. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

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How to use CSS and D3 to achieve dynamic effects of spaceships

##Code Interpretation

Definition dom,

spacecraftrepresents the spacecraft, and the container contains 1 element representing the tailfins:

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Centered display:

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

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Draw the spaceship cabin:

.spacecraft { width: 7em; height: 11em; font-size: 16px; background: linear-gradient(whitesmoke, darkgray); border-radius: 50% / 70% 70% 5% 5%; }

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Use pseudo elements to draw the flames at the tail of the spacecraft:

.spacecraft::before { content: ''; position: absolute; width: 6em; height: 2em; background-color: #444; border-radius: 20%; top: 10em; left: 0.5em; z-index: -1; } .spacecraft::after { content: ''; position: absolute; box-sizing: border-box; width: 4em; height: 4em; background: gold; top: 10em; left: 1.5em; border-radius: 80% 0 50% 45% / 50% 0 80% 45%; transform: rotate(135deg); border: 0.5em solid orange; z-index: -2; }

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Draw the tails on both sides of the spacecraft:

.fins::before, .fins::after { content: ''; position: absolute; width: 2em; height: 6em; background: linear-gradient(tomato, darkred); top: 7em; } .fins::before { left: -2em; border-radius: 3em 0 50% 100%; } .fins::after { right: -2em; border-radius: 0 3em 100% 50%; }

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Use radial gradient to draw the spacecraft Porthole:

.spacecraft { background: radial-gradient( circle at 3.5em 5em, transparent 1.5em, lightslategray 1.5em, lightslategray 2em, transparent 2em ), radial-gradient( circle at 3.3em 5.2em, deepskyblue 1.4em, transparent 1.6em ), radial-gradient( circle at 3.5em 5em, white 1.5em, transparent 1.5em ), linear-gradient(whitesmoke, darkgray); }

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Increase the animation effect of the ship’s flame jet:

.spacecraft::after { animation: flame-spout 0.3s infinite; } @keyframes flame-spout { 0%, 100% { filter: opacity(0.1); } 50% { filter: opacity(1); } }

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Next, draw the starry sky.

Add the
starscontainer in the dom, which contains 4 sub-elements representing stars:

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Define the style of the stars:

.stars span { position: absolute; width: 2px; height: 8px; border-radius: 50%; background-color: white; top: calc(50% - 7em); }

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Use variables to distribute the stars in Different positions in the horizontal direction:

.stars span { left: calc(var(--left) * 1vw); } .stars span:nth-child(1) { --left: 20; } .stars span:nth-child(2) { --left: 40; } .stars span:nth-child(3) { --left: 60; } .stars span:nth-child(4) { --left: 80; }

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Use variables to set the size and opacity of the stars so that each star looks slightly different:

.stars span { width: calc(var(--size) * 1px); height: calc(var(--size) * 4px); filter: opacity(var(--opacity)); } .stars span:nth-child(1) { --size: 0.8; --opacity: 0.5; } .stars span:nth-child(2) { --size: 1.25; --opacity: 0.6; } .stars span:nth-child(3) { --size: 1.5; --opacity: 0.7; } .stars span:nth-child(4) { --size: 2; --opacity: 0.8; }

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Define the animation effect of stars floating through space :

.stars span { top: -5vh; animation: star-move linear infinite; } @keyframes star-move { to { top: 100vh; } }

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Use variables to set the duration and delay time of the animation:

.stars span { animation-duration: calc(var(--duration) * 1s); animation-delay: calc(var(--delay) * 1s); } .stars span:nth-child(1) { --duration: 1; --delay: -0.05; } .stars span:nth-child(2) { --duration: 1.5; --delay: -0.1; } .stars span:nth-child(3) { --duration: 2; --delay: -0.15; } .stars span:nth-child(4) { --duration: 2.5; --delay: -0.2; }

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Hide the content outside the screen:

body { overflow: hidden; }

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Next, use d3 to batch process the dom elements representing the stars. and css variables.

Introduce d3 library:

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Use d3 to create dom elements representing stars:

const COUNT_OF_STARS = 4; d3.select('.stars') .selectAll('span') .data(d3.range(COUNT_OF_STARS)) .enter() .append('span');

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Use d3 as css variable

--left,-- size,--opacityassignment, the value range of--leftis 1 to 100, the value range of--sizeis 1 to 2.5, the value range of '--opacity' is 0.5 to 0.8:

d3.select('.stars') .selectAll('span') .data(d3.range(COUNT_OF_STARS)) .enter() .append('span') .style('--left', () => Math.ceil(Math.random() * 100)) .style('--size', () => Math.random() * 1.5 + 1) .style('--opacity', () => Math.random() * 0.3 + 0.5);

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Use d3 to assign values to css variables

--durationand--delay,# The value range of ##--durationis 1 to 3, and the value of--delayis reduced by 0.05:

d3.select('.stars') .selectAll('span') .data(d3.range(COUNT_OF_STARS)) .enter() .append('span') .style('--left', () => Math.ceil(Math.random() * 100)) .style('--size', () => Math.random() * 1.5 + 1) .style('--opacity', () => Math.random() * 0.3 + 0.5) .style('--duration', () => Math.random() * 2 + 1) .style('--delay', (d) => d * -0.05);

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Delete the relevant dom statement in the html file and variable declarations in css files.

Finally, increase the number of stars to 30: