svg鼠标跟随龙

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<svg>
	<defs>
		<g id="Cabeza" transform="matrix(1, 0, 0, 1, 0, 0)">
			<path style="fill:#FFFFFF;fill-opacity:1" d="M-28.9,-1.1L-28.55 -1.95Q-28.1 -3.1 -27.25 -2.95L-26.7 -2.95Q-27.7 -1.65 -28.9 -1.1M-18.35,-1.8Q-15.1 -10.3 -9.6 -6.05Q-15.1 -6.2 -18.35 -1.8M-18.35,1.1Q-15.1 5.45 -9.6 5.35Q-15.1 9.55 -18.35 1.1M-26.7,2.2L-27.25 2.25Q-28.1 2.4 -28.55 1.2L-28.9 0.35Q-27.7 0.9 -26.7 2.2" />
			<path style="fill:#000000;fill-opacity:1" d="M-21.05,-8.25Q-13.6 -15.95 -1.3 -12.1Q-7.85 -8.5 -5.85 -4.35Q-2.3 -4.85 10.5 0.15Q0 4.35 -5.85 3.65Q-7.85 7.75 -1.25 12.45Q-13.6 15.2 -21.05 7.5Q-29.55 4.05 -30.2 -0.35Q-29.55 -4.8 -21.05 -8.25M-26.7,-2.95L-27.25 -2.95Q-28.1 -3.1 -28.55 -1.95L-28.9 -1.1Q-27.7 -1.65 -26.7 -2.95M-9.6,-6.05Q-15.1 -10.3 -18.35 -1.8Q-15.1 -6.2 -9.6 -6.05M-9.6,5.35Q-15.1 5.45 -18.35 1.1Q-15.1 9.55 -9.6 5.35M-28.9,0.35L-28.55 1.2Q-28.1 2.4 -27.25 2.25L-26.7 2.2Q-27.7 0.9 -28.9 0.35" />
		</g>
		<g id="Aletas" transform="matrix(1, 0, 0, 1, 0, 0)">
			<linearGradient id="LinearGradID_1" gradientUnits="userSpaceOnUse" gradientTransform="matrix(0.0935974, 0, 0, 0.188782, -20.55, 0)" spreadMethod="pad" x1="-819.2" y1="0" x2="819.2" y2="0">
				<stop offset="0" style="stop-color:#CCCCCC;stop-opacity:1" />
				<stop offset="1" style="stop-color:#000000;stop-opacity:1" />
			</linearGradient>
			<path style="fill:url(#LinearGradID_1) " d="M29.75,-36.85Q-17.75 -61.45 -42.05 -40.95L-45.35 -38.35L-53.7 -41.15L-51.15 -44.85Q-34.85 -68.4 21 -57.8Q-32.2 -72.1 -50.25 -50Q-53.85 -45.65 -56.05 -41.95L-64.7 -43.35L-60.6 -50.3Q-45.9 -75.55 5.1 -79.35Q-2.2 -79.8 -9.45 -79.15Q-16.2 -78.55 -22.85 -77.15Q-29.85 -75.65 -36.5 -73Q-43.05 -70.4 -48.8 -66.85Q-54.55 -63.35 -56.8 -60.3L-60.5 -55.4Q-62.95 -52.1 -67 -43.55L-70.55 -43.55L-76.35 -42.95Q-74.6 -49.1 -71.85 -54.85Q-68.9 -61.25 -64.8 -67.1Q-60.8 -73 -55.45 -77.55Q-49.9 -82.35 -43.65 -85.85L-30.6 -92.7Q-24.05 -95.95 -17 -98.25Q-63.75 -86.35 -73.65 -57.1Q-75.75 -50.75 -77.45 -42.75Q-82.9 -41.75 -88 -39.65Q-87.65 -46.65 -86.3 -53.05Q-79.8 -89.8 -36.65 -117.2Q-80.65 -94.5 -87.55 -59.55Q-88.65 -54.15 -88.95 -39.4L-89.8 -38.85L-92.7 -37.6Q-93.75 -44.35 -94.1 -51.15Q-94.4 -58.2 -93.25 -65.1Q-92.15 -72.5 -90.05 -79.65Q-88.05 -86.55 -85 -93Q-82.1 -99.3 -78.45 -105.15Q-74.6 -111.35 -70.25 -117.25Q-65.95 -123.1 -61.1 -128.55Q-70.3 -119.35 -77.9 -108.7Q-86 -97.3 -90.8 -84.05Q-95.8 -70.5 -96 -56.15Q-96.1 -46 -94.05 -36.05L-93.25 -31.55Q-93.5 -35.65 -92.35 -36Q-79.85 -42 -66.6 -40.45Q-52.45 -38.85 -39.2 -33.25Q-28.3 -29.9 -21.25 -24.15Q-17.8 -23.3 -8.6 -15.6Q-12.1 -20.75 -16.75 -24.5Q-24.55 -30.7 -34.25 -34.05L-42.55 -37Q-38.9 -41.25 -31.5 -43.25Q-24.05 -45.3 -16.2 -46.3Q-8.35 -47.35 -1 -46Q5.95 -44.75 12.75 -42.85Q19.85 -40.9 29.75 -36.85M-92.45,-27.35L-94.95 -36.25Q-109.7 -105 -27.95 -154.65Q-98.65 -103.8 -91.75 -39.4L-89.95 -40.2Q-92.2 -105.25 -5.6 -130.9Q-78.8 -99.95 -87.45 -40.9Q-83.15 -42.95 -78.45 -43.95Q-70 -101.3 17.65 -103.8Q-56.9 -93.4 -74.5 -44.55L-67.4 -45.45Q-49.1 -94.95 39.25 -75.65Q-36.75 -84.35 -62.25 -44.25L-57.3 -43.6Q-31.65 -86.5 56.15 -46.05Q-20.3 -73.35 -51.35 -41.7L-45.95 -39.75Q-17.85 -71.35 51.85 -24.8Q-8.7 -56.4 -39.75 -37.05Q-28.15 -34.05 -14.25 -24.45Q-8.6 -19.85 -5.8 -16.95Q5.95 -2.4 20 0Q5.95 2.4 -5.8 16.95Q-8.6 19.85 -14.25 24.45Q-28.15 34.05 -39.75 37.05Q-8.7 56.4 51.85 24.8Q-17.85 71.35 -45.95 39.75L-51.35 41.7Q-20.3 73.35 56.15 46.1Q-31.65 86.5 -57.3 43.65L-62.25 44.3Q-36.75 84.35 39.25 75.7Q-49.1 94.95 -67.4 45.5L-74.5 44.6Q-56.9 93.4 17.65 103.85Q-70 101.3 -78.45 43.95Q-83.15 42.95 -87.45 40.9Q-78.8 99.95 -5.6 130.9Q-92.2 105.25 -89.95 40.25L-91.75 39.4Q-98.65 103.8 -27.95 154.65Q-109.7 105 -94.95 36.3L-92.45 27.35Q-93.05 33.9 -92.05 34.75Q-91.1 35.55 -88.95 36.7L-87.95 37Q-83.7 38.25 -79.05 38.8L-77.25 38.95Q-72.55 39.3 -67.5 38.85L-65.45 38.65Q-44.4 36.05 -17.8 19.6Q-9.9 12.8 -15.15 4.4Q-18.15 3.15 -19 0Q-18.15 -3.15 -15.15 -4.4Q-9.9 -12.8 -17.8 -19.6L-17.8 -19.55Q-44.4 -36.05 -65.45 -38.6L-67.5 -38.8Q-72.55 -39.3 -77.25 -38.95L-79.05 -38.75Q-83.7 -38.25 -87.95 -36.95L-88.95 -36.65Q-91.1 -35.55 -92.05 -34.7Q-93.05 -33.9 -92.45 -27.35M-8.6,15.6Q-17.8 23.3 -21.25 24.2Q-28.3 29.9 -39.2 33.3Q-52.45 38.85 -66.6 40.5Q-79.85 42 -92.35 36Q-93.5 35.65 -93.25 31.55L-94.05 36.1Q-96.1 46.05 -96 56.15Q-95.8 70.5 -90.8 84.1Q-86 97.3 -77.9 108.75Q-70.3 119.35 -61.1 128.6Q-65.95 123.1 -70.25 117.25Q-74.6 111.35 -78.45 105.15Q-82.1 99.3 -85 93Q-88.05 86.55 -90.05 79.7Q-92.15 72.5 -93.25 65.1Q-94.4 58.2 -94.1 51.2Q-93.75 44.35 -92.7 37.6L-89.8 38.9L-88.95 39.45Q-88.65 54.15 -87.55 59.55Q-80.65 94.5 -36.65 117.25Q-79.8 89.8 -86.3 53.1Q-87.65 46.65 -88 39.65Q-82.9 41.75 -77.45 42.75Q-75.75 50.75 -73.65 57.15Q-63.75 86.35 -17 98.3Q-24.05 95.95 -30.6 92.75L-43.65 85.9Q-49.9 82.35 -55.45 77.6Q-60.8 73 -64.8 67.15Q-68.9 61.25 -71.85 54.85Q-74.6 49.1 -76.35 42.95L-70.55 43.6L-67 43.6Q-62.95 52.1 -60.5 55.4L-56.8 60.35Q-54.55 63.35 -48.8 66.9Q-43.05 70.4 -36.5 73Q-29.85 75.65 -22.85 77.15Q-16.2 78.55 -9.45 79.15Q-2.2 79.8 5.1 79.35Q-45.9 75.55 -60.6 50.3L-64.7 43.4L-56.05 41.95Q-53.85 45.65 -50.25 50Q-32.2 72.1 21 57.85Q-34.85 68.4 -51.15 44.85L-53.7 41.2L-45.35 38.35L-42.05 40.95Q-17.75 61.45 29.75 36.85Q19.85 40.9 12.75 42.9Q5.95 44.75 -1 46Q-8.35 47.35 -16.2 46.35Q-24.05 45.3 -31.5 43.3Q-38.9 41.25 -42.55 37.05L-34.25 34.05Q-24.55 30.7 -16.75 24.5Q-12.1 20.75 -8.6 15.6" />
		</g>
		<g id="Espina" transform="matrix(1, 0, 0, 1, 0, 0)">
			<linearGradient id="LinearGradID_2" gradientUnits="userSpaceOnUse" gradientTransform="matrix(0.0229492, 0, 0, -0.0152893, 0, 0.05)" spreadMethod="pad" x1="-819.2" y1="0" x2="819.2" y2="0">
				<stop offset="0" style="stop-color:#CCCCCC;stop-opacity:1" />
				<stop offset="1" style="stop-color:#333333;stop-opacity:1" />
			</linearGradient>
			<path style="fill:url(#LinearGradID_2) " d="M-18.8,0Q-17.85 -5.7 -12.3 -9.6Q-11.2 -5.35 -6.5 -8.25L-6.45 -8.2L-6.2 -8.3Q1.25 -16.25 6.65 -12.4Q0.05 -12.55 0 -5.95Q2.7 -2.4 7.75 -4.1Q18 -1.45 18.8 0L-18.8 0" />
			<linearGradient id="LinearGradID_3" gradientUnits="userSpaceOnUse" gradientTransform="matrix(0.0229492, 0, 0, 0.0152893, 0, -0.05)" spreadMethod="pad" x1="-819.2" y1="0" x2="819.2" y2="0">
				<stop offset="0" style="stop-color:#CCCCCC;stop-opacity:1" />
				<stop offset="1" style="stop-color:#333333;stop-opacity:1" />
			</linearGradient>
			<path style="fill:url(#LinearGradID_3) " d="M18.8,0Q18 1.45 7.75 4.1Q2.7 2.4 0 5.95Q0.05 12.55 6.65 12.4Q1.25 16.25 -6.2 8.35Q-6.35 8.25 -6.45 8.25L-6.5 8.25Q-11.2 5.35 -12.3 9.6Q-17.85 5.7 -18.8 0L18.8 0" />
		</g>
	</defs>
	<g id="screen" />
</svg>

css

JavaScript

"use strict";
// Ported from flash
// credits https://www.deviantart.com/gifhaas/art/Dragon-8681899 dragon by GifHaas on DeviantArt

const screen = document.getElementById("screen");
const xmlns = "http://www.w3.org/2000/svg";
const xlinkns = "http://www.w3.org/1999/xlink";

window.addEventListener(
	"pointermove",
	(e) => {
		pointer.x = e.clientX;
		pointer.y = e.clientY;
		rad = 0;
	},
	false
);

const resize = () => {
	width = window.innerWidth;
	height = window.innerHeight;
};

let width, height;
window.addEventListener("resize", () => resize(), false);
resize();

const prepend = (use, i) => {
	const elem = document.createElementNS(xmlns, "use");
	elems[i].use = elem;
	elem.setAttributeNS(xlinkns, "xlink:href", "#" + use);
	screen.prepend(elem);
};
	
const N = 40;

const elems = [];
for (let i = 0; i < N; i++) elems[i] = { use: null, x: width / 2, y: 0 };
const pointer = { x: width / 2, y: height / 2 };
const radm = Math.min(pointer.x, pointer.y) - 20;
let frm = Math.random();
let rad = 0;

for (let i = 1; i < N; i++) {
	if (i === 1) prepend("Cabeza", i);
	else if (i === 8 || i === 14) prepend("Aletas", i);
	else prepend("Espina", i);
}

const run = () => {
	requestAnimationFrame(run);
	let e = elems[0];
	const ax = Math.cos(3 * frm) * rad * width / height;
	const ay = Math.sin(4 * frm) * rad * height / width;
	e.x += (ax + pointer.x - e.x) / 10;
	e.y += (ay + pointer.y - e.y) / 10;
	for (let i = 1; i < N; i++) {
		let e = elems[i];
		let ep = elems[i - 1];
		const a = Math.atan2(e.y - ep.y, e.x - ep.x);
		e.x += (ep.x - e.x + (Math.cos(a) * (100 - i)) / 5) / 4;
		e.y += (ep.y - e.y + (Math.sin(a) * (100 - i)) / 5) / 4;
		const s = (162 + 4 * (1 - i)) / 50;
		e.use.setAttributeNS(
			null,
			"transform",
			`translate(${(ep.x + e.x) / 2},${(ep.y + e.y) / 2}) rotate(${
				(180 / Math.PI) * a
			}) translate(${0},${0}) scale(${s},${s})`
		);
	}
	if (rad < radm) rad++;
	frm += 0.003;
	if (rad > 60) {
		pointer.x += (width / 2 - pointer.x) * 0.05;
		pointer.y += (height / 2 - pointer.y) * 0.05;
	}
};

run();

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