@spearwolf/twopoint5d/lib/stage/Canvas2DStage.js

a library to create 2.5d realtime graphics and pixelart with three.js

import { emit, eventize } from '@spearwolf/eventize';
import { Sprite, SpriteMaterial, Texture } from 'three';
import { TextureFactory } from '../texture/TextureFactory.js';
import { OrthographicProjection } from './OrthographicProjection.js';
import { Stage2D } from './Stage2D.js';
export class Canvas2DStage {
    #fit;
    get fit() {
        return this.#fit;
    }
    set fit(value) {
        if (this.#fit === value)
            return;
        this.#fit = value;
        this.projection.viewSpecs.fit = value;
        this.stage.update(true);
    }
    get width() {
        return this.canvas.width;
    }
    get height() {
        return this.canvas.height;
    }
    get scene() {
        return this.stage.scene;
    }
    #textureFactory;
    #lastWidth;
    #lastHeight;
    constructor(renderer, ...args) {
        this.#fit = 'contain';
        this.needsUpdate = false;
        this.#lastWidth = 0;
        this.#lastHeight = 0;
        eventize(this);
        this.renderer = renderer;
        if (typeof args[0] === 'number') {
            const [width, height, fit] = args;
            this.#fit = fit ?? this.#fit;
            this.canvas = document.createElement('canvas');
            this.canvas.width = width;
            this.canvas.height = height;
        }
        else {
            const [canvas, fit] = args;
            this.#fit = fit ?? this.#fit;
            this.canvas = canvas;
        }
        this.projection = new OrthographicProjection('xy|bottom-left', {
            width: this.width,
            height: this.height,
            fit: this.#fit,
        });
        this.stage = new Stage2D(this.projection);
        const material = new SpriteMaterial({ map: new Texture() });
        this.sprite = new Sprite(material);
        this.sprite.scale.set(this.width, this.height, 1);
        this.scene.add(this.sprite);
    }
    makeTexture() {
        if (this.texture) {
            this.texture.dispose();
        }
        this.#textureFactory ||= new TextureFactory(this.renderer, ['nearest', 'flipy', 'srgb']);
        this.texture = this.#textureFactory.create(this.canvas);
        return this.texture;
    }
    updateTexture() {
        if (this.needsUpdate) {
            this.sprite.material.map = this.makeTexture();
            this.sprite.material.needsUpdate = true;
            this.needsUpdate = false;
        }
    }
    setContainerSize(width, height) {
        this.stage.resize(width, height);
    }
    setCanvasSize(width, height) {
        if (this.width === width && this.height === height)
            return;
        this.canvas.width = width;
        this.canvas.height = height;
        this.sprite.scale.set(width, height, 1);
        const viewSpecs = this.projection.viewSpecs;
        viewSpecs.width = width;
        viewSpecs.height = height;
        this.stage.update(true);
    }
    render() {
        if (this.width !== this.#lastWidth || this.height !== this.#lastHeight) {
            this.dispatchEvent('resize');
            this.#lastWidth = this.width;
            this.#lastHeight = this.height;
        }
        this.dispatchEvent('render');
        this.updateTexture();
        this.stage.renderFrame(this.renderer, 0, 0, 0);
    }
    dispatchEvent(eventName) {
        emit(this, eventName, this);
    }
}
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