/**
 * TerrainBrush — Sculpting brushes (raise/lower/smooth/flatten/paint)
 *
 * Applies heightmap modifications with configurable radius, strength,
 * and falloff curves.
 *
 * @version 1.0.0
 */
export type BrushMode = 'raise' | 'lower' | 'smooth' | 'flatten' | 'paint' | 'erode';
export type FalloffCurve = 'linear' | 'smooth' | 'sphere' | 'tip' | 'flat';
export interface BrushConfig {
    mode: BrushMode;
    radius: number;
    strength: number;
    falloff: FalloffCurve;
    opacity: number;
}
export interface BrushStroke {
    x: number;
    z: number;
    config: BrushConfig;
    timestamp: number;
}
export interface TerrainCell {
    height: number;
    paintLayer: number;
    locked: boolean;
}
export declare class TerrainBrush {
    private grid;
    private strokes;
    private undoStack;
    private config;
    private gridSize;
    constructor(gridSize?: number, config?: Partial<BrushConfig>);
    /**
     * Apply brush at a position
     */
    apply(cx: number, cz: number, overrides?: Partial<BrushConfig>): number;
    /**
     * Paint a layer at a position
     */
    paint(cx: number, cz: number, layerIndex: number): number;
    /**
     * Undo last stroke
     */
    undo(): boolean;
    /**
     * Get height at a grid position
     */
    getHeight(x: number, z: number): number;
    /**
     * Get cell data
     */
    getCell(x: number, z: number): TerrainCell | undefined;
    /**
     * Lock/unlock cells
     */
    setLocked(x: number, z: number, locked: boolean): void;
    /**
     * Get current config
     */
    getConfig(): BrushConfig;
    /**
     * Set config
     */
    setConfig(cfg: Partial<BrushConfig>): void;
    /**
     * Get stroke count
     */
    getStrokeCount(): number;
    /**
     * Get grid size
     */
    getGridSize(): number;
    /**
     * Get undo count
     */
    getUndoCount(): number;
    /**
     * Get height range
     */
    getHeightRange(): {
        min: number;
        max: number;
    };
}
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