import { FieldOfViewMap } from './field-of-view-map';
import { FieldOfViewImpl } from './field-of-view-impl';
/**
 * Compute the field of view for a camera at the given tile.
 * chebyshevRadius is the vision radius.  It uses chebyshev distance
 * (https://en.wikipedia.org/wiki/Chebyshev_distance), which just means
 * that the limit of vision in a large empty field will be square.
 *
 * This returns a WarpRect, which indicates which tiles are visible
 * and which map is seen in each tile.  warpRect.getMask(x, y) will return
 * true for visible tiles, warpRect.getMap(x, y) will return
 * the map for that tile, and warpRect.getOffset(x, y) will return the
 * location in that map which is visible there.
 */
export declare function computeFieldOfView(map: FieldOfViewMap, x: number, y: number, chebyshevRadius: number): FieldOfViewImpl;