feat: add in creature rendering

This commit is contained in:
B Wu 2024-08-09 21:15:49 -07:00
parent 514b033884
commit 73e1530a1d
4 changed files with 224 additions and 4 deletions

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@ -1,5 +1,217 @@
window.onload = () => { const CREATURE_HEIGHT = 32; // in px
console.log('from js'); const CREATURE_WIDTH = 32; // in px
const kennelWindowEle = document.querySelector('#kennel-window'); const FRAME_RATE = 12; // in FPS
kennelWindowEle.innerHTML = 'rendered from static/index.js'; const FRAME_DELAY = 1 / FRAME_RATE * 1000; // in ms
const DEFAULT_SPRITE_SHEET_COUNT = 1; // number of default sprite sheets
/**
* Enum of creature states
* @readonly
* @enum {number}
*/
const CreatureState = Object.freeze({
IDLE: 0,
ALERT: 1,
SCRATCH_SELF: 2,
SCRATCH_NORTH: 3,
SCRATCH_SOUTH: 4,
SCRATCH_EAST: 5,
SCRATCH_WEST: 6,
TIRED: 7,
SLEEPING: 8,
WALK_NORTH: 9,
WALK_NORTHEAST: 10,
WALK_EAST: 11,
WALK_SOUTHEAST: 12,
WALK_SOUTH: 13,
WALK_SOUTHWEST: 14,
WALK_WEST: 15,
WALK_NORTHWEST: 16,
})
/**
* @typedef {[number, number]} SpriteFrameOffset the offset of the sprite with respect to
* the left/top background position offset (off by factor of sprite size)
* @type {Object.<number, Array<SpriteFrameOffset>>}
*/
const CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES = Object.freeze({
[CreatureState.IDLE]: [
[-3, -3]
],
[CreatureState.ALERT]: [
[-7, -3]
],
[CreatureState.SCRATCH_SELF]: [
[-5, 0],
[-6, 0],
[-7, 0],
],
[CreatureState.SCRATCH_NORTH]: [
[0, 0],
[0, -1],
],
[CreatureState.SCRATCH_SOUTH]: [
[-7, -1],
[-6, -2],
],
[CreatureState.SCRATCH_EAST]: [
[-2, -2],
[-2, -3],
],
[CreatureState.SCRATCH_WEST]: [
[-4, 0],
[-4, -1],
],
[CreatureState.TIRED]: [
[-3, -2]
],
[CreatureState.SLEEPING]: [
[-2, 0],
[-2, -1],
],
[CreatureState.WALK_NORTH]: [
[-1, -2],
[-1, -3],
],
[CreatureState.WALK_NORTHEAST]: [
[0, -2],
[0, -3],
],
[CreatureState.WALK_EAST]: [
[-3, 0],
[-3, -1],
],
[CreatureState.WALK_SOUTHEAST]: [
[-5, -1],
[-5, -2],
],
[CreatureState.WALK_SOUTH]: [
[-6, -3],
[-7, -2],
],
[CreatureState.WALK_SOUTHWEST]: [
[-5, -3],
[-6, -1],
],
[CreatureState.WALK_WEST]: [
[-4, -2],
[-4, -3],
],
[CreatureState.WALK_NORTHWEST]: [
[-1, 0],
[-1, -1],
],
});
/**
* Properties for creatures running around the screen
* @typedef {Object} Creature
* @property {string} name the name of the creature, used as the HTML element's id
* @property {string} spriteSheet the file name of the sprite sheet. should exist in {@link /static/sprites}
* @property {number} state the current state of the creature (should be member of {@link CreatureState} enum)
* @property {number} stateDuration the number of frames the creature has been in its current state
* @property {number} positionX the number of pixels away from the left side of the container element
* @property {number} positionY the number of pixels away from the top of the container element
* @property {HTMLElement} element the HTML element rendering the creature in the DOM
* @property {HTMLElement} container the HTML element containing the creature (the kennel, if you will)
*/
/**
* Returns random number between min (inclusive) and max (exclusive)
* If max is less than or equal to min, return min
* @param {number} min inclusive lower bound
* @param {number} max exclusive upper bound
* @return {number} number in [min, max)
*/
const randomInt = (min, max) => {
if (max <= min) return min;
return Math.floor(Math.random() * (max - min) + min);
}
/**
* Return a creature's next frame based on the current creature frame
* @param {Creature} creature
* @return Creature the next frame of the creature
*/
const getNextCreatureFrame = (creature) => {
// TODO
return { ...creature, stateDuration: creature.stateDuration + 1 };
}
/**
* Render a frame of the creature and loads the next frame for render
* @param {Creature} creature
* @return Creature the next frame of the creature
*/
const renderCreature = (creature) => {
// set position
const positionX = Math.min(creature.positionX, creature.container.clientWidth);
const positionY = Math.min(creature.positionY, creature.container.clientHeight);
creature.element.style.setProperty('left', `${positionX}px`);
creature.element.style.setProperty('top', `${positionY}px`);
// set sprite
const spriteFrames = CREATURE_STATE_TO_SPRITE_FRAME_OFFSET_INDICES[creature.state]
const currentSpriteFrameOffset = spriteFrames?.[creature.stateDuration % spriteFrames.length]
creature.element.style.setProperty(
'background-position',
`${currentSpriteFrameOffset[0] * CREATURE_WIDTH}px ${currentSpriteFrameOffset[1] * CREATURE_HEIGHT}px`
)
const nextCreatureFrame = getNextCreatureFrame(creature);
setTimeout(renderCreature, FRAME_DELAY, nextCreatureFrame)
}
/**
* Create the creature and start its rendering
* @param {HTMLElement} container container element for creatures. the kennel if you will
* @param {string} name name of the creature
* @param {string} [spriteSheet] name of the sprite sheet. must be in /static/sprites
* uses default sprite sheet if undefined
* @param {number} [initialState] starting state of the creature
* @param {number} [initialPositionX] initial x position in pixels (from the left side)
* @param {number} [initialPositionY] initial y position in pixels (from the top)
*/
const createCreature = (
container,
name,
spriteSheet,
initialState = CreatureState.IDLE,
initialPositionX = 0,
initialPositionY = 0
) => {
const creatureEl = document.createElement('div');
const spriteSheetUrl = spriteSheet
? `url('/static/sprites/${spriteSheet}')`
: `url('/static/sprites/defaults/${randomInt(1, DEFAULT_SPRITE_SHEET_COUNT)}.gif')`;
creatureEl.setAttribute('id', name);
creatureEl.style.setProperty('width', `${CREATURE_WIDTH}px`);
creatureEl.style.setProperty('height', `${CREATURE_HEIGHT}px`);
creatureEl.style.setProperty('position', 'fixed');
creatureEl.style.setProperty('image-rendering', 'pixelated');
creatureEl.style.setProperty('background-image', spriteSheetUrl);
container.appendChild(creatureEl);
renderCreature({
name,
spriteSheet,
state: initialState,
stateDuration: 0,
positionX: Math.max(0, initialPositionX),
positionY: Math.max(0, initialPositionY),
element: creatureEl,
container
});
}
window.onload = () => {
const kennelWindowEle = document.querySelector('#kennel-window');
createCreature(
kennelWindowEle,
'test-creature',
undefined,
CreatureState.SCRATCH_SELF
)
} }

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7
static/style.css Normal file
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#kennel-window {
width: 80vw;
min-width: 8rem;
height: 80vw;
min-height: 8rem;
margin: auto inherit;
}

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@ -4,6 +4,7 @@
<meta charset="UTF-8"> <meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge"> <meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="{{ url_for('static', path='style.css') }}">
<title>Kennel Club</title> <title>Kennel Club</title>
</head> </head>
<body> <body>