lingo3d/lib/systems/hitTestSystem.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

import { forceGetInstance } from "@lincode/utils";
import { HitEvent } from "../interface/IVisible";
import { getAppendablesById } from "../collections/idCollections";
import createInternalSystem from "./utils/createInternalSystem";
const getAppendables = (val) => {
    if (!val)
        return [];
    if (typeof val === "string")
        return getAppendablesById(val);
    const result = [];
    for (const id of val)
        for (const appendable of getAppendablesById(id))
            result.push(appendable);
    return result;
};
const hitCache = new WeakMap();
export const hitTestSystem = createInternalSystem("hitTestSystem", {
    update: (self) => {
        for (const target of getAppendables(self.hitTarget)) {
            if (!("object3d" in target))
                return;
            const cache = forceGetInstance(hitCache, self, WeakSet);
            if (self.hitTest(target)) {
                if (!cache.has(target)) {
                    cache.add(target);
                    self.onHitStart?.(new HitEvent(target));
                }
                self.onHit?.(new HitEvent(target));
                continue;
            }
            if (!cache.has(target))
                continue;
            cache.delete(target);
            self.onHitEnd?.(new HitEvent(target));
        }
    }
});
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