import { Vector2 } from "../struct/vector";
interface LightPassesCallback {
    (pos: Vector2): boolean;
}
interface VisibilityCallback {
    (pos: Vector2, range: number, visibility: number): void;
}
interface VisibilityStruct {
    pos: Vector2;
    r: number;
    visibility: number;
}
interface PreciseShadowcastingConfig {
    lightPasses: LightPassesCallback;
    topology: "four" | "eight";
    returnAll?: boolean;
    cartesianRange?: boolean;
}
/** FOV Algorithm that calculates angles of shadows and merges them together. */
export declare class PreciseShadowcasting {
    private lightPasses;
    private getRing;
    private returnAll;
    private cartesianRange;
    /**
     * Creates a new PreciseShadowcasting object
     * which can calulate viewsheds.
     *
     * @param config
     * @param config.lightPasses Vector2 => Boolean - Whether a position is visible
     * @param config.topology "four" | "eight" | "free" - The topology to use
     * @param config.returnAll Return all spaces in range, even if not visible. Default false.
     * @param config.cartesianRange If set, will calculate range as a^2 + b^2 = c^2. Results in round shape. Default false.
     */
    constructor(config: PreciseShadowcastingConfig);
    /**
     * Calculates an array of visible Vectors. Same as calculateCallback,
     * but returns an Array instead.
     *
     * @param origin Vector2 - The position to start from.
     * @param range Number - The range of vision
     */
    calculateArray(origin: Vector2, range: number): VisibilityStruct[];
    /**
     * Calculates visible positions, and invokes the given callback for each one.
     *
     * @param origin Vector2 - The position to start from
     * @param range Number - The range of vision
     * @param callback (pos: Vector2, range: number, visibility: number) => void - The function to call for each visible tile
     */
    calculateCallback(origin: Vector2, range: number, callback: VisibilityCallback): void;
    private checkVisibility;
    private checkShadowVisibility;
}
export {};