/**
 * The northern snow line.
 *
 * North of the goblin camps the ground gives way to snow. The change is a band
 * rather than a line: flecks of white in the grass at the southern edge,
 * thickening to full cover as you walk north, so a player crossing it sees the
 * country change under their feet instead of stepping over a seam.
 *
 * Where it applies is deliberately narrow. Only the open flank WEST of the
 * Dreadwoods gets snow (x < DEADLANDS_MIN_X): the woods themselves are an ash
 * forest with their own floor and their own walls, and everything east of them
 * is Calverton, the Trout Fishery and the Amazon Trail - none of which are
 * meant to be arctic. The Dreadwoods' west wall is what the snow meets, so the
 * boundary is a built edge rather than a hard change in open ground.
 */
/**
 * Where the snow line sits before the wander below moves it.
 *
 * Goblin camps run z 648-658 (BATTLEFIELD_GOBLIN_CAMPS). Those numbers live in
 * landmarks.ts, which already imports this file, so the northernmost row is
 * repeated here rather than closing a cycle.
 *
 * Furthest south the wander can push the ramp is
 * SNOW_EDGE_Z + SNOW_WANDER_TILES = 565, about 83 tiles north of that goblin
 * row (a quarter of the way closer from the earlier grass gap). The camps
 * themselves stay green.
 */
export declare const SNOW_EDGE_Z = 607;
/** North of this the cover is solid. 68 tiles of transition, ~17s of walking. */
export declare const SNOW_DEEP_Z = 539;
/** Half-range of the wander applied to the line, in tiles. */
export declare const SNOW_WANDER_TILES = 22;
/**
 * True on the flank the snow is allowed to cover at all.
 *
 * The southern bound has to clear SNOW_EDGE_Z by the full wander. Cutting it at
 * SNOW_EDGE_Z instead put a dead straight line across the map wherever the
 * wander had pushed the ramp south of its nominal row: the patches simply
 * stopped mid-fade, in a ruler line, which is precisely what the wander exists
 * to prevent.
 */
export declare function inSnowRegion(x: number, z: number): boolean;
/**
 * How thoroughly this tile is covered, 0 (bare) to 1 (solid snow).
 *
 * The latitude ramp is pushed around by a long-wavelength noise so the snow
 * line wanders by a good twenty tiles instead of running dead straight across
 * the map - a ruler-straight climate boundary is the thing that would give the
 * whole band away as generated.
 */
export declare function snowDepthAt(x: number, z: number): number;
/**
 * True when this tile should be laid as snow rather than whatever it was.
 *
 * Compared against a second, finer noise rather than a per-tile random roll:
 * a random roll gives salt-and-pepper, and what a thawing edge actually looks
 * like is patches - drifts lying in the hollows with bare ground between them.
 */
export declare function isSnowTile(x: number, z: number): boolean;
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