tobspr_shapez.io/src/js/game/systems/lever.js

import { GameSystemWithFilter } from "../game_system_with_filter";
import { LeverComponent } from "../components/lever";
import { BOOL_TRUE_SINGLETON, BOOL_FALSE_SINGLETON } from "../items/boolean_item";
import { MapChunkView } from "../map_chunk_view";
import { globalConfig } from "../../core/config";
import { Loader } from "../../core/loader";

export class LeverSystem extends GameSystemWithFilter {
    constructor(root) {
        super(root, [LeverComponent]);

        this.spriteOn = Loader.getSprite("sprites/wires/lever_on.png");
        this.spriteOff = Loader.getSprite("sprites/buildings/lever.png");
    }

    update() {
        for (let i = 0; i < this.allEntities.length; ++i) {
            const entity = this.allEntities[i];

            const leverComp = entity.components.Lever;
            const pinsComp = entity.components.WiredPins;

            // Simply sync the status to the first slot
            pinsComp.slots[0].value = leverComp.toggled ? BOOL_TRUE_SINGLETON : BOOL_FALSE_SINGLETON;
        }
    }

    /**
     * Draws a given chunk
     * @param {import("../../core/draw_utils").DrawParameters} parameters
     * @param {MapChunkView} chunk
     */
    drawChunk(parameters, chunk) {
        const contents = chunk.contents;
        for (let y = 0; y < globalConfig.mapChunkSize; ++y) {
            for (let x = 0; x < globalConfig.mapChunkSize; ++x) {
                const entity = contents[x][y];

                if (entity && entity.components.Lever) {
                    const sprite = entity.components.Lever.toggled ? this.spriteOn : this.spriteOff;

                    const staticComp = entity.components.StaticMapEntity;
                    staticComp.drawSpriteOnFullEntityBounds(parameters, sprite, 0);
                }
            }
        }
    }
}