All files / games/engine/src/systems movement.ts

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import { GameMap, PositionInterface } from "jga-games-maps";
 
import { TileInterface } from "jga-games-tiles";
 
import { ComponentName, PositionComponent } from "../components";
 
import { Entity } from "../entities";
import { System } from "./system";
 
export interface MoveInterface {
    canMove: boolean;
    newPosition: PositionInterface | null;
}
 
export class MovementSystem extends System {
    protected position: PositionInterface;
    protected map: GameMap;
 
    public constructor(
        entities: Map<string, Entity>,
        position: PositionInterface,
        map: GameMap,
    ) {
        super(entities, [ComponentName.MOVEABLE, ComponentName.POSITION]);
 
        this.position = position;
        this.map = map;
    }
 
    public getPosition(): PositionInterface {
        return this.position;
    }
 
    public getMap(): GameMap {
        return this.map;
    }
 
    public run(): void {
        this.entities.forEach((entity): void => {
            const move = this.canMove();
 
            if (move.canMove) {
                const positionComponent = entity.getComponent(
                    ComponentName.POSITION,
                ) as PositionComponent;
 
                positionComponent.setPosition(this.position);
            }
        });
    }
 
    public canMove(): MoveInterface {
        const move: MoveInterface = {
            canMove: false,
            newPosition: this.position,
        };
 
        if (null != this.position && null != this.map) {
            const tile: TileInterface = this.map.getTile(this.position);
 
            if (null !== tile) {
                if (tile.isWalkable) {
                    move.canMove = true;
                } else if (tile.isDiggable) {
                    this.map.dig(this.position);
                }
            }
        }
 
        return move;
    }
}