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| // oneko.js
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| // Copyright © 2022 adryd
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| // SPDX-License-Identifier: MIT
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| // https://github.com/adryd325/oneko.js
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|
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| (function oneko() {
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| const isReducedMotion =
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| window.matchMedia(`(prefers-reduced-motion: reduce)`) === true ||
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| window.matchMedia(`(prefers-reduced-motion: reduce)`).matches === true;
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|
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| if (isReducedMotion) return;
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|
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| const nekoEl = document.createElement("div");
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|
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| let nekoPosX = 32;
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| let nekoPosY = 32;
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|
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| let mousePosX = 0;
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| let mousePosY = 0;
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|
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| let frameCount = 0;
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| let idleTime = 0;
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| let idleAnimation = null;
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| let idleAnimationFrame = 0;
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|
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| const nekoSpeed = 10;
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| const spriteSets = {
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| idle: [[-3, -3]],
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| alert: [[-7, -3]],
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| scratchSelf: [
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| [-5, 0],
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| [-6, 0],
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| [-7, 0],
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| ],
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| scratchWallN: [
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| [0, 0],
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| [0, -1],
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| ],
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| scratchWallS: [
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| [-7, -1],
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| [-6, -2],
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| ],
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| scratchWallE: [
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| [-2, -2],
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| [-2, -3],
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| ],
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| scratchWallW: [
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| [-4, 0],
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| [-4, -1],
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| ],
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| tired: [[-3, -2]],
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| sleeping: [
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| [-2, 0],
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| [-2, -1],
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| ],
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| N: [
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| [-1, -2],
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| [-1, -3],
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| ],
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| NE: [
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| [0, -2],
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| [0, -3],
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| ],
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| E: [
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| [-3, 0],
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| [-3, -1],
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| ],
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| SE: [
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| [-5, -1],
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| [-5, -2],
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| ],
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| S: [
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| [-6, -3],
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| [-7, -2],
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| ],
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| SW: [
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| [-5, -3],
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| [-6, -1],
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| ],
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| W: [
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| [-4, -2],
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| [-4, -3],
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| ],
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| NW: [
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| [-1, 0],
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| [-1, -1],
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| ],
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| };
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|
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| function init() {
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| nekoEl.id = "oneko";
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| nekoEl.ariaHidden = true;
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| nekoEl.style.width = "32px";
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| nekoEl.style.height = "32px";
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| nekoEl.style.position = "fixed";
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| nekoEl.style.pointerEvents = "none";
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| nekoEl.style.imageRendering = "pixelated";
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| nekoEl.style.left = `${nekoPosX - 16}px`;
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| nekoEl.style.top = `${nekoPosY - 16}px`;
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| nekoEl.style.zIndex = Number.MAX_VALUE;
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|
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| let nekoFile = "./oneko.gif"
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| const curScript = document.currentScript
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| if (curScript && curScript.dataset.cat) {
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| nekoFile = curScript.dataset.cat
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| }
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| nekoEl.style.backgroundImage = `url(${nekoFile})`;
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|
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| document.body.appendChild(nekoEl);
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|
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| document.addEventListener("mousemove", function (event) {
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| mousePosX = event.clientX;
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| mousePosY = event.clientY;
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| });
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|
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| window.requestAnimationFrame(onAnimationFrame);
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| }
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|
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| let lastFrameTimestamp;
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|
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| function onAnimationFrame(timestamp) {
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| // Stops execution if the neko element is removed from DOM
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| if (!nekoEl.isConnected) {
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| return;
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| }
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| if (!lastFrameTimestamp) {
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| lastFrameTimestamp = timestamp;
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| }
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| if (timestamp - lastFrameTimestamp > 100) {
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| lastFrameTimestamp = timestamp
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| frame()
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| }
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| window.requestAnimationFrame(onAnimationFrame);
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| }
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|
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| function setSprite(name, frame) {
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| const sprite = spriteSets[name][frame % spriteSets[name].length];
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| nekoEl.style.backgroundPosition = `${sprite[0] * 32}px ${sprite[1] * 32}px`;
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| }
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|
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| function resetIdleAnimation() {
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| idleAnimation = null;
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| idleAnimationFrame = 0;
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| }
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|
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| function idle() {
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| idleTime += 1;
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|
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| // every ~ 20 seconds
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| if (
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| idleTime > 10 &&
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| Math.floor(Math.random() * 200) == 0 &&
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| idleAnimation == null
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| ) {
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| let avalibleIdleAnimations = ["sleeping", "scratchSelf"];
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| if (nekoPosX < 32) {
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| avalibleIdleAnimations.push("scratchWallW");
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| }
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| if (nekoPosY < 32) {
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| avalibleIdleAnimations.push("scratchWallN");
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| }
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| if (nekoPosX > window.innerWidth - 32) {
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| avalibleIdleAnimations.push("scratchWallE");
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| }
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| if (nekoPosY > window.innerHeight - 32) {
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| avalibleIdleAnimations.push("scratchWallS");
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| }
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| idleAnimation =
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| avalibleIdleAnimations[
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| Math.floor(Math.random() * avalibleIdleAnimations.length)
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| ];
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| }
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|
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| switch (idleAnimation) {
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| case "sleeping":
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| if (idleAnimationFrame < 8) {
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| setSprite("tired", 0);
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| break;
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| }
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| setSprite("sleeping", Math.floor(idleAnimationFrame / 4));
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| if (idleAnimationFrame > 192) {
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| resetIdleAnimation();
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| }
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| break;
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| case "scratchWallN":
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| case "scratchWallS":
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| case "scratchWallE":
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| case "scratchWallW":
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| case "scratchSelf":
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| setSprite(idleAnimation, idleAnimationFrame);
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| if (idleAnimationFrame > 9) {
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| resetIdleAnimation();
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| }
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| break;
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| default:
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| setSprite("idle", 0);
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| return;
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| }
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| idleAnimationFrame += 1;
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| }
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|
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| function frame() {
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| frameCount += 1;
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| const diffX = nekoPosX - mousePosX;
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| const diffY = nekoPosY - mousePosY;
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| const distance = Math.sqrt(diffX ** 2 + diffY ** 2);
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|
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| if (distance < nekoSpeed || distance < 48) {
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| idle();
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| return;
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| }
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|
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| idleAnimation = null;
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| idleAnimationFrame = 0;
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|
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| if (idleTime > 1) {
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| setSprite("alert", 0);
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| // count down after being alerted before moving
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| idleTime = Math.min(idleTime, 7);
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| idleTime -= 1;
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| return;
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| }
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|
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| let direction;
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| direction = diffY / distance > 0.5 ? "N" : "";
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| direction += diffY / distance < -0.5 ? "S" : "";
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| direction += diffX / distance > 0.5 ? "W" : "";
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| direction += diffX / distance < -0.5 ? "E" : "";
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| setSprite(direction, frameCount);
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|
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| nekoPosX -= (diffX / distance) * nekoSpeed;
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| nekoPosY -= (diffY / distance) * nekoSpeed;
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|
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| nekoPosX = Math.min(Math.max(16, nekoPosX), window.innerWidth - 16);
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| nekoPosY = Math.min(Math.max(16, nekoPosY), window.innerHeight - 16);
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|
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| nekoEl.style.left = `${nekoPosX - 16}px`;
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| nekoEl.style.top = `${nekoPosY - 16}px`;
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| }
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|
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| init();
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| })();
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