@spearwolf/twopoint5d/lib/map2d/RectangularVisibilityAreaHelpers.js

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

import { Box3, Box3Helper, Color, Vector3 } from 'three/webgpu';
import { HelpersManager } from './HelpersManager.js';
export class RectangularVisibilityAreaHelpers {
    #viewRect;
    #show;
    #helpers;
    constructor(visibilityArea) {
        this.viewRectHelperHeight = 20;
        this.viewRectHelperColor = new Color(0xffffff);
        this.#viewRect = undefined;
        this.#show = false;
        this.#helpers = new HelpersManager();
        this.visibilityArea = visibilityArea;
    }
    get show() {
        return this.#show;
    }
    set show(show) {
        if (this.#show && !show) {
            this.#helpers.remove();
        }
        else if (!this.#show && show) {
            this.update();
        }
        this.#show = show;
    }
    add(scene) {
        this.#helpers.scene = scene;
    }
    remove(scene) {
        this.#helpers.removeFromScene(scene);
    }
    update() {
        const halfWidth = this.visibilityArea.width / 2;
        const halfHeight = this.visibilityArea.height / 2;
        const viewRectHelperHalfHeight = this.viewRectHelperHeight / 2;
        this.#viewRect = new Box3(new Vector3(-halfWidth, -viewRectHelperHalfHeight, -halfHeight), new Vector3(halfWidth, viewRectHelperHalfHeight, halfHeight));
        this.#helpers.remove();
        if (this.#viewRect) {
            const helper = new Box3Helper(this.#viewRect, this.viewRectHelperColor);
            this.#helpers.add(helper);
        }
    }
}
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