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c37d8d13c7
...
b005f4b83a
695
static/index.js
695
static/index.js
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@ -5,24 +5,6 @@ const CREATURE_WIDTH = 32; // in px
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const FRAME_RATE = 6; // in FPS
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const FRAME_RATE = 6; // in FPS
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const FRAME_DELAY = 1 / FRAME_RATE * 1000; // in ms
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const FRAME_DELAY = 1 / FRAME_RATE * 1000; // in ms
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const DEFAULT_SPRITE_SHEET_COUNT = 1; // number of default sprite sheets
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const DEFAULT_SPRITE_SHEET_COUNT = 1; // number of default sprite sheets
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const WALK_SIZE = 8; // magnitude of position change, in px
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const MAX_RETRIES = 10;
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/**
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* Enum of directions
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* @readonly
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* @enum {number}
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*/
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const Direction = Object.freeze({
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NORTH: 0,
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EAST: 1,
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SOUTH: 2,
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WEST: 3,
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NORTHEAST: 4,
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SOUTHEAST: 5,
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SOUTHWEST: 6,
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NORTHWEST: 7,
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})
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/**
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/**
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* Enum of creature states
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* Enum of creature states
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@ -50,8 +32,8 @@ const CreatureState = Object.freeze({
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})
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})
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/**
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/**
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* @typedef {[number, number]} SpriteFrameOffset the client of the sprite with respect to
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* @typedef {[number, number]} SpriteFrameOffset the offset of the sprite with respect to
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* the left/top background position client (off by factor of sprite size)
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* the left/top background position offset (off by factor of sprite size)
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* @type {Object.<number, Array<SpriteFrameOffset>>}
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* @type {Object.<number, Array<SpriteFrameOffset>>}
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*/
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*/
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const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
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const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
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@ -127,8 +109,6 @@ const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
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// === <TYPES> ===
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// === <TYPES> ===
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/** @typedef {[number, number]} vec2 a vector 2 components */
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/**
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/**
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* Properties for creatures running around the screen
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* Properties for creatures running around the screen
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* @typedef {Object} Creature
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* @typedef {Object} Creature
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@ -136,11 +116,10 @@ const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
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* @property {string} spriteSheet the file name of the sprite sheet. should exist in {@link /static/sprites}
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* @property {string} spriteSheet the file name of the sprite sheet. should exist in {@link /static/sprites}
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* @property {number} state the current state of the creature (should be member of {@link CreatureState} enum)
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* @property {number} state the current state of the creature (should be member of {@link CreatureState} enum)
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* @property {number} stateDuration the number of frames the creature has been in its current state
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* @property {number} stateDuration the number of frames the creature has been in its current state
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* @property {number} positionX x component of the center of the creature position
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* @property {number} positionX the number of pixels away from the left side of the container element
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* @property {number} positionY y component of the center of the creature position
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* @property {number} positionY the number of pixels away from the top of the container element
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* @property {HTMLElement} element the HTML element rendering the creature in the DOM
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* @property {HTMLElement} element the HTML element rendering the creature in the DOM
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* @property {HTMLElement} container the HTML element containing the creature (the kennel, if you will)
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* @property {HTMLElement} container the HTML element containing the creature (the kennel, if you will)
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* @property {?vec2} walkDirection the (normed) direction a creature is walking in, if it's walking. otherwise null.
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*/
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*/
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// === <TYPES> ===
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// === <TYPES> ===
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@ -148,26 +127,15 @@ const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
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// === <MATH_UTILS> ===
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// === <MATH_UTILS> ===
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/**
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/**
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* Returns a random number between min (inclusive) and max (exclusive).
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* Returns random number between min (inclusive) and max (exclusive)
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* If max is less than or equal to min, return min
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* If max is less than or equal to min, return min
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* @param {number} min inclusive lower bound
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* @param {number} min inclusive lower bound
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* @param {number} max exclusive upper bound
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* @param {number} max exclusive upper bound
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* @return {number} number in [min, max)
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* @return {number} number in [min, max)
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*/
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*/
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const getRandomInRange = (min, max) => {
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const randomInt = (min, max) => {
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if (max <= min) return min;
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if (max <= min) return min;
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return Math.random() * (max - min) + min;
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return Math.floor(Math.random() * (max - min) + min);
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}
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/**
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* Returns random number between min (inclusive) and max (exclusive)
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* If max is less than or equal to min, return Math.floor(min)
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* @param {number} min inclusive lower bound
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* @param {number} max exclusive upper bound
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* @return {number} integer in [min, max)
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*/
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const getRandomInt = (min, max) => {
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return Math.floor(getRandomInRange(min, max));
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}
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}
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/**
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/**
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@ -193,250 +161,10 @@ const normalize = (...components) => {
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return components.map(component => component / magnitude)
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return components.map(component => component / magnitude)
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}
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}
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/**
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* Recursive helper for {@link getRandomChoice}
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* @template {!*} T
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* @param {Array<number>} weights
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* @param {Array<T>} choices
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* @param {number} random
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* @param {number} cumulativeSum
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* @return {undefined|T}
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* @ignore
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*/
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const _getRandomChoice = (weights, choices, random, cumulativeSum) => {
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const choice = choices.shift();
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if (choice === undefined) {
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return undefined;
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}
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const newCumulativeSum = (weights.shift() ?? 0) + cumulativeSum;
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if (random < newCumulativeSum) {
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return choice;
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}
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return _getRandomChoice(weights, choices, random, newCumulativeSum);
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}
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/**
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* Given an array of weights and an array of the same length of choices,
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* randomly pick an element from the choices whose probability of picking it corresponds
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* to the corresponding weight (given position in the array).
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* Returns undefined when there are fewer choices than weights
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* @template {!*} T type of the choice elements
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* @param {?Array<number>} weights if undefined, default to equal probability distribution of weights
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* @param {Array<T>} choices
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* @return {undefined|T} the chosen element, or undefined if there are more weights than choices
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*/
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const getRandomChoice = (weights, choices) => {
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weights = weights ?? Array(choices.length).fill(1 / choices.length);
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const weightSum = weights.reduce((sum, probability) => sum + probability, 0);
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const random = Math.random() * weightSum;
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return _getRandomChoice([...weights], [...choices], random, 0);
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}
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/**
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* Roll an n-sided, 1-indexed die.
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* Return true if it's a nat n (ie the die lands on side n).
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* False otherwise.
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* @param {number} n number of faces on the die.
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* @return {boolean}
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*/
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const rollForNatN = (n) => {
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return Math.random() < 1 / n;
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}
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/**
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* Returns true if two circles intersect, false otherwise.
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* We consider circles to intersect iff there exists a point p that lies in both circles
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* @param {number} x0 x component of the center of circle 1
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* @param {number} y0 y component of the center of circle 1
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* @param {number} r0 radius of circle 1
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* @param {number} x1 x component of the center of circle 1
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* @param {number} y1 y component of the center of circle 1
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* @param {number} r1 radius of circle 1
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* @return {boolean}
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*/
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const isIntersectingCircles = (x0, y0, r0, x1, y1, r1) => {
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return (x0 - x1) * (x0 - x1) + (y0 - y1) * (y0 - y1) < (r0 + r1) * (r0 + r1);
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}
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/**
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* Return true if val in [min, max)
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* @param {number} val
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* @param {number} min
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* @param {number} max
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* @return {boolean}
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*/
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const isBetween = (val, min, max) => {
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return val >= min && val < max;
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}
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/**
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* Generate an array of n vec2's such that all vectors lie in
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* [left, left + width) x [top, top + height) and are at least radius
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* distance away from all other points.
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* This function uses almost (but not quite)
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* [the poisson disk sampling method]{@link https://a5huynh.github.io/posts/2019/poisson-disk-sampling/}
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* insofar that instead of generating points in an annulus around a seed,
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* it generates points anywhere else in the bounds.
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* @param {number} n the number of points to generate
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* @param {number} radius the minimum distance between points
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* @param {number} left x lower bound of points
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* @param {number} top y lower bound of points
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* @param {number} width x width of bounds
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* @param {number} height y width of bounds
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* @param {number=} maxRetries maximum number of generation attemps before giving up
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* @return {Array<vec2>}
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*/
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const generateBlueNoise = (n, radius, left, top, width, height, maxRetries = MAX_RETRIES) => {
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const gridCellSize = radius / Math.sqrt(2);
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const gridWidth = Math.ceil(width / gridCellSize);
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const gridHeight = Math.ceil(height / gridCellSize);
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const grid = /** @type {Array<Array<vec2|undefined>>} */ [...Array(gridHeight)].map(() => Array(gridWidth));
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/**
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* @param {vec2} point
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* @return {vec2}
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*/
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const getSamplePoint = (point) => {
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const randomX = Math.random() * (width - 2 * radius);
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const randomY = Math.random() * (height - 2 * radius);
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const samplePointX = left + (
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randomX < (point.at(0) - radius) ? randomX : randomX + 2 * radius
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)
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const samplePointY = top + (
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randomY < (point.at(1) - radius) ? randomY : randomY + 2 * radius
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)
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return [samplePointX, samplePointY];
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}
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/**
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* @param {vec2} point
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* @return {void}
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*/
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const insertPointIntoGrid = (point) => {
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const indexX = Math.floor((point.at(0) - left) / gridCellSize);
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const indexY = Math.floor((point.at(1) - top) / gridCellSize);
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grid[indexY][indexX] = point;
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}
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const areValid = (point1, point2) => {
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const deltaX = point1.at(0) - point2.at(0);
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const deltaY = point1.at(1) - point2.at(1);
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return (deltaX * deltaX + deltaY * deltaY) > (radius * radius)
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}
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/**
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* @param {vec2} point
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* @return {boolean}
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*/
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const isValidPoint = (point) => {
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const indexX = Math.floor((point.at(0) - left) / gridCellSize);
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const indexY = Math.floor((point.at(1) - top) / gridCellSize);
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const testPoints = [
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[indexX - 1, indexY - 1], [indexX, indexY - 1], [indexX + 1, indexY - 1],
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[indexX - 1, indexY], [indexX, indexY], [indexX + 1, indexY],
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[indexX - 1, indexY + 1], [indexX, indexY + 1], [indexX + 1, indexY + 1],
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]
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.filter((indices) => (
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indices.at(0) >= 0 && indices.at(1) >= 0 && indices.at(0) < gridWidth && indices.at(1) < gridHeight
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))
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.map((indices) => grid[indices.at(1)][indices.at(0)])
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.filter((point) => point !== undefined);
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return testPoints.every((testPoint) => areValid(point, testPoint))
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}
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// initialize
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const initialPoint = [
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left + width / 2, top + height / 2,
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]
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insertPointIntoGrid(initialPoint);
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const blueNoiseSamples = [initialPoint];
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const activeList = [initialPoint];
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const findAndInsertPoint = () => {
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if (activeList.length === 0) return;
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const activePoint = /** @type {vec2} */ getRandomChoice(undefined, activeList);
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const samplePoints = [...Array(MAX_RETRIES)].map(_ => getSamplePoint(activePoint));
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const samplePoint = samplePoints.find(isValidPoint);
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if (samplePoint === undefined) {
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// remove active point from active list
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const indexOfActivePoint = activeList.indexOf(activePoint);
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activeList.splice(indexOfActivePoint, 1);
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return;
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}
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activeList.push(samplePoint);
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blueNoiseSamples.push(samplePoint);
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insertPointIntoGrid(samplePoint);
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}
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while (activeList.length > 0 && blueNoiseSamples.length < n) {
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findAndInsertPoint();
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}
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return blueNoiseSamples.length < n ? [] : blueNoiseSamples;
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}
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// === </MATH_UTILS> ===
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// === </MATH_UTILS> ===
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// === <CREATURE_UTILS> ===
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// === <CREATURE_UTILS> ===
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||||||
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|
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/**
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|
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* Given a normalized direction a creature is walking in, return
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* the creature state that corresponds closest to the direction.
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* Defaults to WALK_NORTH if something goes wrong.
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* @param {vec2} direction
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* @return {number} corresponding {@link CreatureState}
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*/
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const getWalkStateFromDirection = (direction) => {
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const directionAngle = Math.atan2(direction.at(0), direction.at(1));
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if (Number.isNaN(directionAngle)) {
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return CreatureState.WALK_NORTH; // default
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}
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if (isBetween(directionAngle, Math.PI * 5/8, Math.PI * 7/8)) {
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return CreatureState.WALK_NORTHEAST;
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}
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if (isBetween(directionAngle, Math.PI * 3/8, Math.PI * 5/8)) {
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return CreatureState.WALK_EAST;
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}
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if (isBetween(directionAngle, Math.PI / 8, Math.PI * 3/8)) {
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return CreatureState.WALK_SOUTHEAST;
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}
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if (isBetween(directionAngle, -Math.PI / 8, Math.PI / 8)) {
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return CreatureState.WALK_SOUTH;
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}
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if (isBetween(directionAngle, -Math.PI * 3/8, -Math.PI / 8)) {
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return CreatureState.WALK_SOUTHWEST;
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}
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if (isBetween(directionAngle, -Math.PI * 5/8, -Math.PI * 3/8)) {
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return CreatureState.WALK_WEST;
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}
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if (isBetween(directionAngle, -Math.PI * 7/8, -Math.PI * 5/8)) {
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return CreatureState.WALK_NORTHWEST;
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}
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return CreatureState.WALK_NORTH;
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||||||
}
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/**
|
/**
|
||||||
* Return a new updateCreature function that implicitly accepts the context
|
* Return a new updateCreature function that implicitly accepts the context
|
||||||
* of all other creatures being rendered.
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* of all other creatures being rendered.
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||||||
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|
@ -445,7 +173,7 @@ const getWalkStateFromDirection = (direction) => {
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||||||
* @param {Array<Creature>} allCreatures all creatures rendered in the scene
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* @param {Array<Creature>} allCreatures all creatures rendered in the scene
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||||||
* @return {(creature: Creature) => Creature} an updateCreature function
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* @return {(creature: Creature) => Creature} an updateCreature function
|
||||||
*/
|
*/
|
||||||
const updateCreatureWithContext = (updateCreature, allCreatures) => {
|
const updateCreatureWithAllCreaturesContext = (updateCreature, allCreatures) => {
|
||||||
const creaturesMap = Object.fromEntries(allCreatures.map(
|
const creaturesMap = Object.fromEntries(allCreatures.map(
|
||||||
creature => [ creature.name, creature ]
|
creature => [ creature.name, creature ]
|
||||||
));
|
));
|
||||||
|
|
@ -466,10 +194,8 @@ const renderCreature = (creature) => {
|
||||||
creature.element.style.setProperty('display', 'block');
|
creature.element.style.setProperty('display', 'block');
|
||||||
|
|
||||||
// set position
|
// set position
|
||||||
const positionX = creature.positionX - (0.5 * CREATURE_WIDTH) + creature.container.clientLeft
|
creature.element.style.setProperty('left', `${creature.positionX}px`);
|
||||||
const positionY = creature.positionY - (0.5 * CREATURE_HEIGHT) + creature.container.clientTop
|
creature.element.style.setProperty('top', `${creature.positionY}px`);
|
||||||
creature.element.style.setProperty('left', `${positionX}px`);
|
|
||||||
creature.element.style.setProperty('top', `${positionY}px`);
|
|
||||||
|
|
||||||
// set sprite
|
// set sprite
|
||||||
const spriteFrames = CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES[creature.state]
|
const spriteFrames = CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES[creature.state]
|
||||||
|
|
@ -503,7 +229,7 @@ const createCreature = (
|
||||||
const creatureEle = document.createElement('div');
|
const creatureEle = document.createElement('div');
|
||||||
const spriteSheetUrl = spriteSheet
|
const spriteSheetUrl = spriteSheet
|
||||||
? `url('/static/sprites/${spriteSheet}')`
|
? `url('/static/sprites/${spriteSheet}')`
|
||||||
: `url('/static/sprites/defaults/${getRandomInt(1, DEFAULT_SPRITE_SHEET_COUNT)}.gif')`;
|
: `url('/static/sprites/defaults/${randomInt(1, DEFAULT_SPRITE_SHEET_COUNT)}.gif')`;
|
||||||
|
|
||||||
creatureEle.setAttribute('id', name);
|
creatureEle.setAttribute('id', name);
|
||||||
creatureEle.style.setProperty('width', `${CREATURE_WIDTH}px`);
|
creatureEle.style.setProperty('width', `${CREATURE_WIDTH}px`);
|
||||||
|
|
@ -531,6 +257,7 @@ const createCreature = (
|
||||||
* Start creature animation
|
* Start creature animation
|
||||||
* @param {Creature} creature
|
* @param {Creature} creature
|
||||||
* @param {(creature: Creature) => Creature} [updateCreature] if undefined, uses identity
|
* @param {(creature: Creature) => Creature} [updateCreature] if undefined, uses identity
|
||||||
|
* (via {@link renderAndUpdateCreature})
|
||||||
*/
|
*/
|
||||||
const beginCreatureAnimation = (
|
const beginCreatureAnimation = (
|
||||||
creature,
|
creature,
|
||||||
|
|
@ -547,377 +274,43 @@ const beginCreatureAnimation = (
|
||||||
|
|
||||||
// === </CREATURE_UTILS> ===
|
// === </CREATURE_UTILS> ===
|
||||||
|
|
||||||
/**
|
|
||||||
* Returns true if any point in creature 1's collision box is in creature 2's collision box
|
|
||||||
* @param {Creature} creature1
|
|
||||||
* @param {Creature} creature2
|
|
||||||
* @return {boolean}
|
|
||||||
*/
|
|
||||||
const isCreaturesColliding = (creature1, creature2) => {
|
|
||||||
return isIntersectingCircles(
|
|
||||||
creature1.positionX, creature1.positionY, CREATURE_WIDTH / 2,
|
|
||||||
creature2.positionX, creature2.positionY, CREATURE_WIDTH / 2,
|
|
||||||
)
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Returns the direction of the wall of collision if it collides. Otherwise, return undefined.
|
|
||||||
* @param {Creature} creature
|
|
||||||
* @return {number | undefined}
|
|
||||||
*/
|
|
||||||
const isCreatureOutOfBounds = (creature) => {
|
|
||||||
if (creature.positionX - CREATURE_WIDTH / 2 < creature.container.clientLeft) {
|
|
||||||
return Direction.WEST;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (creature.positionX + CREATURE_WIDTH / 2 > creature.container.clientLeft + creature.container.clientWidth) {
|
|
||||||
return Direction.EAST;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (creature.positionY - CREATURE_HEIGHT / 2 < creature.container.clientTop) {
|
|
||||||
return Direction.NORTH;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (creature.positionY + CREATURE_HEIGHT / 2 > creature.container.clientTop + creature.container.clientHeight) {
|
|
||||||
return Direction.SOUTH;
|
|
||||||
}
|
|
||||||
|
|
||||||
return undefined;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Get the creature in the walk state moving toward a destination
|
|
||||||
* @param {Creature} creature
|
|
||||||
* @param {vec2} destination
|
|
||||||
* @return {Creature} the creature in a walking state
|
|
||||||
*/
|
|
||||||
const startCreatureWalkTowardDirection = (creature, destination) => {
|
|
||||||
const walkDirection = /** @type {vec2} */ normalize(
|
|
||||||
destination.at(0) - creature.positionX,
|
|
||||||
destination.at(1) - creature.positionY,
|
|
||||||
);
|
|
||||||
const state = getWalkStateFromDirection(walkDirection);
|
|
||||||
return {
|
|
||||||
...creature,
|
|
||||||
walkDirection,
|
|
||||||
state,
|
|
||||||
stateDuration: state === creature.state ? creature.stateDuration + 1 : 0,
|
|
||||||
positionX: creature.positionX + walkDirection.at(0) * WALK_SIZE,
|
|
||||||
positionY: creature.positionY + walkDirection.at(1) * WALK_SIZE,
|
|
||||||
};
|
|
||||||
}
|
|
||||||
/**
|
|
||||||
* Update function for creatures in any scratch state. * @param {Creature} creature current creature
|
|
||||||
* @param {Creature} creature
|
|
||||||
* @return {Creature} updated creature
|
|
||||||
*/
|
|
||||||
const updateScratchStateCreature = (creature) => {
|
|
||||||
if (creature.stateDuration % 2 < 1) {
|
|
||||||
// animation hasn't finished playing. let it finish.
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
if (rollForNatN(4)) {
|
|
||||||
return { ...creature, state: CreatureState.IDLE, stateDuration: 0 };
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Used for {@link updateWalkStateCreature} to map the output of wall collision to new state
|
|
||||||
* @type {Readonly<Object.<number, number>>}
|
|
||||||
* @ignore
|
|
||||||
*/
|
|
||||||
const WALL_DIRECTION_TO_SCRATCH_STATE = Object.freeze({
|
|
||||||
[Direction.NORTH]: CreatureState.SCRATCH_NORTH,
|
|
||||||
[Direction.EAST]: CreatureState.SCRATCH_EAST,
|
|
||||||
[Direction.SOUTH]: CreatureState.SCRATCH_SOUTH,
|
|
||||||
[Direction.WEST]: CreatureState.SCRATCH_WEST,
|
|
||||||
})
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Update function for creatures in any walk state.
|
|
||||||
* @param {Creature} creature current creature
|
|
||||||
* @param {Array<Creature>} allCreatures all creatures in kennel
|
|
||||||
* @return {Creature} updated creature
|
|
||||||
*/
|
|
||||||
const updateWalkStateCreature = (creature, allCreatures) => {
|
|
||||||
// always play for at least 8 frames
|
|
||||||
if (creature.stateDuration < 8 || !rollForNatN(10)) {
|
|
||||||
return {
|
|
||||||
...creature,
|
|
||||||
positionX: creature.positionX + (creature.walkDirection?.at(0) ?? 0) * WALK_SIZE,
|
|
||||||
positionY: creature.positionY + (creature.walkDirection?.at(1) ?? 0) * WALK_SIZE,
|
|
||||||
stateDuration: creature.stateDuration + 1,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, walkDirection: undefined, stateDuration: 0, state: CreatureState.IDLE };
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Creature state transitions
|
|
||||||
* @type {Object.<number, function(creature: Creature, allCreatures: Array<Creature>): Creature>}
|
|
||||||
*/
|
|
||||||
const CREATURE_STATE_TO_UPDATE_CREATURE_FUNCTION = Object.freeze({
|
|
||||||
[CreatureState.IDLE]: (creature, allCreatures) => {
|
|
||||||
if (creature.stateDuration < 8) {
|
|
||||||
// play for at least 8 frames
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
const spottedCreatures = allCreatures
|
|
||||||
.filter((otherCreature) => isIntersectingCircles(
|
|
||||||
// circle at creature position with a view distance radius
|
|
||||||
creature.positionX, creature.positionY, CREATURE_WIDTH * 4,
|
|
||||||
otherCreature.positionX, otherCreature.positionY, 0,
|
|
||||||
))
|
|
||||||
.filter((otherCreature) => otherCreature.name !== creature.name)
|
|
||||||
|
|
||||||
// move away from groups of 2 or more creatures
|
|
||||||
if (spottedCreatures.length > 1) {
|
|
||||||
// run away from the centroid of close creatures
|
|
||||||
const centroidX = spottedCreatures.reduce(
|
|
||||||
(sum, spottedCreature) => sum + spottedCreature.positionX, 0,
|
|
||||||
) / spottedCreatures.length;
|
|
||||||
const centroidY = spottedCreatures.reduce(
|
|
||||||
(sum, spottedCreature) => sum + spottedCreature.positionY, 0
|
|
||||||
) / spottedCreatures.length;
|
|
||||||
return startCreatureWalkTowardDirection(creature, [
|
|
||||||
2 * creature.positionX - centroidX,
|
|
||||||
2 * creature.positionY - centroidY,
|
|
||||||
]);
|
|
||||||
}
|
|
||||||
|
|
||||||
// if there's a creature in the view radius, move toward it 25% of the time
|
|
||||||
if (spottedCreatures.length > 0 && rollForNatN(4)) {
|
|
||||||
const spottedCreature = /** @type {Creature} */ getRandomChoice(undefined, spottedCreatures);
|
|
||||||
return startCreatureWalkTowardDirection(creature, [
|
|
||||||
spottedCreature.positionX, spottedCreature.positionY,
|
|
||||||
]);
|
|
||||||
}
|
|
||||||
|
|
||||||
const newState = getRandomChoice(
|
|
||||||
[0.1, 0.1, 0.1, 0.1, 0.6],
|
|
||||||
[
|
|
||||||
CreatureState.ALERT, // 0.1
|
|
||||||
CreatureState.SCRATCH_SELF, // 0.1
|
|
||||||
CreatureState.TIRED, // 0.1
|
|
||||||
CreatureState.WALK_NORTH, // 0.1
|
|
||||||
CreatureState.IDLE, // 0.6
|
|
||||||
],
|
|
||||||
)
|
|
||||||
|
|
||||||
if (newState === CreatureState.IDLE || newState === undefined) {
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
if (newState !== CreatureState.WALK_NORTH) {
|
|
||||||
return {
|
|
||||||
...creature,
|
|
||||||
stateDuration: 0,
|
|
||||||
state: newState,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// transition to walking to random point
|
|
||||||
return startCreatureWalkTowardDirection(creature, [
|
|
||||||
getRandomInRange(creature.container.clientLeft, creature.container.clientLeft + creature.container.clientWidth),
|
|
||||||
getRandomInRange(creature.container.clientTop, creature.container.clientTop + creature.container.clientHeight),
|
|
||||||
]);
|
|
||||||
},
|
|
||||||
[CreatureState.ALERT]: (creature, allCreatures) => {
|
|
||||||
if (creature.stateDuration < 3) {
|
|
||||||
// always play for at three frames
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
const newState = getRandomChoice(
|
|
||||||
[0.1, 0.1, 0.3, 0.5],
|
|
||||||
[
|
|
||||||
CreatureState.SCRATCH_SELF, // 0.1
|
|
||||||
CreatureState.TIRED, // 0.1
|
|
||||||
CreatureState.IDLE, // 0.3
|
|
||||||
CreatureState.WALK_NORTH, // 0.5
|
|
||||||
]
|
|
||||||
)
|
|
||||||
|
|
||||||
if (newState === undefined) {
|
|
||||||
// default if something goes wrong
|
|
||||||
return { ...creature, state: CreatureState.IDLE, stateDuration: 0 };
|
|
||||||
}
|
|
||||||
|
|
||||||
if (newState === CreatureState.WALK_NORTH) {
|
|
||||||
// walk toward random direction
|
|
||||||
return startCreatureWalkTowardDirection(creature, [
|
|
||||||
getRandomInRange(creature.container.clientLeft, creature.container.clientLeft + creature.container.clientWidth),
|
|
||||||
getRandomInRange(creature.container.clientTop, creature.container.clientTop + creature.container.clientHeight),
|
|
||||||
]);
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, state: newState, stateDuration: 0 }
|
|
||||||
},
|
|
||||||
[CreatureState.SCRATCH_SELF]: (creature, allCreatures) => {
|
|
||||||
if (creature.stateDuration % 3 < 2) {
|
|
||||||
// animation hasn't finished playing play until complete
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
if (rollForNatN(4)) {
|
|
||||||
return { ...creature, state: CreatureState.IDLE, stateDuration: 0 };
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
},
|
|
||||||
[CreatureState.SCRATCH_NORTH]: updateScratchStateCreature,
|
|
||||||
[CreatureState.SCRATCH_SOUTH]: updateScratchStateCreature,
|
|
||||||
[CreatureState.SCRATCH_EAST]: updateScratchStateCreature,
|
|
||||||
[CreatureState.SCRATCH_WEST]: updateScratchStateCreature,
|
|
||||||
[CreatureState.TIRED]: (creature, allCreatures) => {
|
|
||||||
if (creature.stateDuration < 8) {
|
|
||||||
// play for eight frames
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
if (rollForNatN(20)) {
|
|
||||||
return { ...creature, state: CreatureState.ALERT, stateDuration: 0 };
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, state: CreatureState.SLEEPING, stateDuration: 0 }
|
|
||||||
},
|
|
||||||
[CreatureState.SLEEPING]: (creature, allCreatures) => {
|
|
||||||
if (creature.stateDuration < 8) {
|
|
||||||
// play for at least eight frames
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
const newState = getRandomChoice(
|
|
||||||
[0.01, 0.02, 0.02, 0.95],
|
|
||||||
[
|
|
||||||
CreatureState.TIRED, // 0.01
|
|
||||||
CreatureState.ALERT, // 0.02
|
|
||||||
CreatureState.IDLE, // 0.02
|
|
||||||
CreatureState.SLEEPING, // 0.95
|
|
||||||
],
|
|
||||||
);
|
|
||||||
|
|
||||||
if (newState === CreatureState.SLEEPING || newState === undefined) {
|
|
||||||
return { ...creature, stateDuration: creature.stateDuration + 1 };
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...creature, state: newState, stateDuration: 0 };
|
|
||||||
},
|
|
||||||
[CreatureState.WALK_NORTH]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_NORTHEAST]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_EAST]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_SOUTHEAST]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_SOUTH]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_SOUTHWEST]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_WEST]: updateWalkStateCreature,
|
|
||||||
[CreatureState.WALK_NORTHWEST]: updateWalkStateCreature,
|
|
||||||
})
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Resolve collisions between the updated creature, the container bounds, and the other creatures.
|
|
||||||
* If the updated creature collides against the wall, move to a scratch direction state.
|
|
||||||
* If the updated creature collides with another creature, move to alert state.
|
|
||||||
* @param {Creature} updatedCreature the creature post update
|
|
||||||
* @param {Array<Creature>} allCreatures all creatures in kennel
|
|
||||||
* @param {Creature} creature previous creature state
|
|
||||||
* @return {Creature}
|
|
||||||
*/
|
|
||||||
const resolveCollision = (updatedCreature, allCreatures, creature) => {
|
|
||||||
// resolve creature collision
|
|
||||||
const collidedCreatures = allCreatures
|
|
||||||
.filter((otherCreature) => isCreaturesColliding(otherCreature, updatedCreature))
|
|
||||||
.filter((collidingCreature) => collidingCreature.name !== updatedCreature.name)
|
|
||||||
|
|
||||||
const collidedCreature = collidedCreatures.length > 0
|
|
||||||
? getRandomChoice(undefined, collidedCreatures)
|
|
||||||
: undefined;
|
|
||||||
|
|
||||||
// one third of the time, try to run away from the collided creature
|
|
||||||
if (collidedCreature !== undefined && rollForNatN(3)) {
|
|
||||||
const collidedCreature = getRandomChoice(undefined, collidedCreatures);
|
|
||||||
return resolveCollision(
|
|
||||||
startCreatureWalkTowardDirection(creature, [
|
|
||||||
creature.positionX - collidedCreature.positionX,
|
|
||||||
creature.positionY - collidedCreature.positionY,
|
|
||||||
]),
|
|
||||||
allCreatures,
|
|
||||||
creature,
|
|
||||||
)
|
|
||||||
}
|
|
||||||
|
|
||||||
if (collidedCreature !== undefined) {
|
|
||||||
return {
|
|
||||||
...creature,
|
|
||||||
state: getRandomChoice(undefined, [CreatureState.ALERT, CreatureState.IDLE, CreatureState.TIRED]),
|
|
||||||
stateDuration: 0,
|
|
||||||
walkDirection: undefined,
|
|
||||||
};
|
|
||||||
}
|
|
||||||
|
|
||||||
// resolve wall collision
|
|
||||||
const wallCollisionDirection = isCreatureOutOfBounds(updatedCreature);
|
|
||||||
|
|
||||||
if (wallCollisionDirection !== undefined) {
|
|
||||||
return {
|
|
||||||
...updatedCreature,
|
|
||||||
state: WALL_DIRECTION_TO_SCRATCH_STATE[wallCollisionDirection] ?? CreatureState.IDLE,
|
|
||||||
walkDirection: undefined,
|
|
||||||
stateDuration: 0,
|
|
||||||
positionX: constrain(
|
|
||||||
updatedCreature.positionX,
|
|
||||||
creature.container.clientLeft + CREATURE_WIDTH / 2,
|
|
||||||
creature.container.clientLeft + creature.container.clientWidth - CREATURE_WIDTH / 2,
|
|
||||||
),
|
|
||||||
positionY: constrain(
|
|
||||||
updatedCreature.positionY,
|
|
||||||
creature.container.clientTop + CREATURE_HEIGHT / 2,
|
|
||||||
creature.container.clientTop + creature.container.clientHeight - CREATURE_HEIGHT / 2,
|
|
||||||
),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
return { ...updatedCreature };
|
|
||||||
}
|
|
||||||
|
|
||||||
window.onload = () => {
|
window.onload = () => {
|
||||||
// user preference for low motion. do not render creatures
|
// EXAMPLE SCRIPT
|
||||||
if (window.matchMedia(`(prefers-reduced-motion: reduce)`).matches) {
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
const TEST_CREATURE_COUNT = 32;
|
|
||||||
const kennelWindowEle = document.querySelector('#kennel-window');
|
const kennelWindowEle = document.querySelector('#kennel-window');
|
||||||
|
const creatures = ['test-creature-1', 'test-creature-2', 'test-creature-3']
|
||||||
const startingPoints = generateBlueNoise(
|
.map((name) => createCreature(
|
||||||
TEST_CREATURE_COUNT, CREATURE_WIDTH,
|
kennelWindowEle,
|
||||||
kennelWindowEle.clientLeft, kennelWindowEle.clientTop,
|
name,
|
||||||
kennelWindowEle.clientWidth, kennelWindowEle.clientHeight
|
undefined, // default sprite sheet
|
||||||
)
|
randomInt(0, 17), // random state
|
||||||
|
randomInt(0, 2) * kennelWindowEle.clientWidth, // randomly left or right side
|
||||||
const creatures = /** @type {Array<Creature>} */ startingPoints
|
randomInt(0, 2) * kennelWindowEle.clientHeight, // randomly top or bottom
|
||||||
.map((startingPoint, index) => createCreature(
|
|
||||||
kennelWindowEle,
|
|
||||||
`test-creature-${index}`,
|
|
||||||
undefined, // use a default sprite sheet
|
|
||||||
CreatureState.IDLE,
|
|
||||||
startingPoint.at(0),
|
|
||||||
startingPoint.at(1),
|
|
||||||
))
|
))
|
||||||
|
|
||||||
const updateCreature = updateCreatureWithContext((creature, allCreatures) => {
|
const updateCreature = updateCreatureWithAllCreaturesContext((creature, allCreatures) => {
|
||||||
const updateCreatureFunction = CREATURE_STATE_TO_UPDATE_CREATURE_FUNCTION[creature.state];
|
// example update creature script to bring creatures to the centroid
|
||||||
const updatedCreature = updateCreatureFunction(creature, allCreatures);
|
|
||||||
return resolveCollision(updatedCreature, allCreatures, creature);
|
const centroidX = allCreatures.reduce(
|
||||||
|
(sum, creature) => sum + creature.positionX,
|
||||||
|
0,
|
||||||
|
) / allCreatures.length;
|
||||||
|
const centroidY = allCreatures.reduce(
|
||||||
|
(sum, creature) => sum + creature.positionY,
|
||||||
|
0,
|
||||||
|
) / allCreatures.length;
|
||||||
|
|
||||||
|
const [deltaX, deltaY] = normalize(
|
||||||
|
centroidX - creature.positionX,
|
||||||
|
centroidY - creature.positionY,
|
||||||
|
);
|
||||||
|
|
||||||
|
return {
|
||||||
|
...creature,
|
||||||
|
positionX: constrain(creature.positionX + deltaX, 0, creature.container.clientWidth),
|
||||||
|
positionY: constrain(creature.positionY + deltaY, 0, creature.container.clientHeight),
|
||||||
|
stateDuration: creature.stateDuration + 1,
|
||||||
|
}
|
||||||
}, creatures);
|
}, creatures);
|
||||||
|
|
||||||
creatures.forEach((creature) => beginCreatureAnimation(creature, updateCreature))
|
creatures.forEach((creature) => beginCreatureAnimation(creature, updateCreature))
|
||||||
}
|
}
|
||||||
|
|
||||||
window.onresize = () => {
|
|
||||||
// TODO: dynamically change creature size based on window size
|
|
||||||
}
|
|
||||||
|
|
|
||||||
|
|
@ -1,12 +1,7 @@
|
||||||
#kennel-window {
|
#kennel-window {
|
||||||
width: 100%;
|
width: 80vw;
|
||||||
height: 100vh;
|
min-width: 8rem;
|
||||||
background-color: whitesmoke;
|
height: 80vw;
|
||||||
margin: 0;
|
min-height: 8rem;
|
||||||
padding: 0;
|
margin: auto;
|
||||||
}
|
}
|
||||||
|
|
||||||
body {
|
|
||||||
margin: 0;
|
|
||||||
padding: 0;
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue