@tsparticles/interaction-external-grab/browser/Grabber.js

tsParticles grab external interaction

import { ExternalInteractorBase, getDistance, getLinkColor, getLinkRandomColor, isInArray, mouseMoveEvent, } from "@tsparticles/engine";
import { Grab } from "./Options/Classes/Grab.js";
import { drawGrab } from "./Utils.js";
const grabMode = "grab", minDistance = 0, minOpacity = 0;
export class Grabber extends ExternalInteractorBase {
    constructor(container, engine) {
        super(container);
        this._engine = engine;
    }
    clear() {
    }
    init() {
        const container = this.container, grab = container.actualOptions.interactivity.modes.grab;
        if (!grab) {
            return;
        }
        container.retina.grabModeDistance = grab.distance * container.retina.pixelRatio;
    }
    interact() {
        const container = this.container, options = container.actualOptions, interactivity = options.interactivity;
        if (!interactivity.modes.grab ||
            !interactivity.events.onHover.enable ||
            container.interactivity.status !== mouseMoveEvent) {
            return;
        }
        const mousePos = container.interactivity.mouse.position;
        if (!mousePos) {
            return;
        }
        const distance = container.retina.grabModeDistance;
        if (!distance || distance < minDistance) {
            return;
        }
        const query = container.particles.quadTree.queryCircle(mousePos, distance, p => this.isEnabled(p));
        for (const particle of query) {
            const pos = particle.getPosition(), pointDistance = getDistance(pos, mousePos);
            if (pointDistance > distance) {
                continue;
            }
            const grabLineOptions = interactivity.modes.grab.links, lineOpacity = grabLineOptions.opacity, opacityLine = lineOpacity - (pointDistance * lineOpacity) / distance;
            if (opacityLine <= minOpacity) {
                continue;
            }
            const optColor = grabLineOptions.color ?? particle.options.links?.color;
            if (!container.particles.grabLineColor && optColor) {
                const linksOptions = interactivity.modes.grab.links;
                container.particles.grabLineColor = getLinkRandomColor(this._engine, optColor, linksOptions.blink, linksOptions.consent);
            }
            const colorLine = getLinkColor(particle, undefined, container.particles.grabLineColor);
            if (!colorLine) {
                continue;
            }
            drawGrab(container, particle, colorLine, opacityLine, mousePos);
        }
    }
    isEnabled(particle) {
        const container = this.container, mouse = container.interactivity.mouse, events = (particle?.interactivity ?? container.actualOptions.interactivity).events;
        return events.onHover.enable && !!mouse.position && isInArray(grabMode, events.onHover.mode);
    }
    loadModeOptions(options, ...sources) {
        if (!options.grab) {
            options.grab = new Grab();
        }
        for (const source of sources) {
            options.grab.load(source?.grab);
        }
    }
    reset() {
    }
}