@spearwolf/twopoint5d/lib/texture/TextureAtlas.js

Create 2.5D realtime graphics and pixelart with WebGL and three.js

const isNamedTextureAtlasArgs = (args) => typeof args[0] === 'string' || typeof args[0] === 'symbol';
const rand = (max) => (Math.random() * max) | 0;
export class TextureAtlas {
    #frames = [];
    #frameNames = new Map();
    add(...args) {
        const id = this.#frames.length;
        if (isNamedTextureAtlasArgs(args)) {
            this.#frameNames.set(args[0], id);
            this.#frames.push({ coords: args[1], data: args[2] });
        }
        else {
            this.#frames.push({ coords: args[0], data: args[1] });
        }
        return id;
    }
    get size() {
        return this.#frames.length;
    }
    get(id) {
        return this.#frames[id];
    }
    frameId(name) {
        return this.#frameNames.get(name);
    }
    frame(name) {
        return this.#frames[this.#frameNames.get(name)];
    }
    frameNames(match) {
        const frameNames = Array.from(this.#frameNames.keys());
        if (match != null) {
            const regex = typeof match === 'string' ? new RegExp(match) : match;
            return frameNames.filter((name) => typeof name === 'string' && regex.test(name));
        }
        return frameNames;
    }
    randomFrameId() {
        return rand(this.#frames.length);
    }
    randomFrame() {
        return this.#frames[this.randomFrameId()];
    }
    randomFrameName() {
        const randomIdx = rand(this.#frameNames.size);
        let idx = 0;
        for (const name of this.#frameNames.keys()) {
            if (idx === randomIdx) {
                return name;
            }
            ++idx;
        }
        return;
    }
    randomFrameIds(count) {
        const frameIds = [];
        for (let i = 0; i < count; i++) {
            frameIds.push(this.randomFrameId());
        }
        return frameIds;
    }
    randomFrames(count) {
        const frames = [];
        for (let i = 0; i < count; i++) {
            frames.push(this.randomFrame());
        }
        return frames;
    }
    randomFrameNames(count) {
        const names = [];
        for (let i = 0; i < count; i++) {
            names.push(this.randomFrameName());
        }
        return names;
    }
}
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