grid2-block-accessor.ts

import { SimpleVector2 } from "../../../math";
import { GridBlockItemFilter } from "./grid-filters";
import { Grid2Holder } from "./holders-2d/grid2-holder";

export class Grid2BlockAccessor<T> {
    public constructor(
        private readonly holder: Grid2Holder<T>,
        private readonly position: SimpleVector2,
    ) {
    }

    public check(filter: GridBlockItemFilter<T>): boolean {
        return filter(this.holder.get(this.position.x, this.position.y) as T);
    }

    public getByOffset(x = 0, y = 0): Grid2BlockAccessor<T> {
        return new Grid2BlockAccessor(this.holder, {x: this.position.x + x, y: this.position.y - y});
    }

    public get top(): Grid2BlockAccessor<T> {
        return this.getByOffset(0, -1);
    }

    public get bottom(): Grid2BlockAccessor<T> {
        return this.getByOffset(0, 1);
    }

    public get left(): Grid2BlockAccessor<T> {
        return this.getByOffset(-1, 0);
    }

    public get right(): Grid2BlockAccessor<T> {
        return this.getByOffset(1, 0);
    }
}