/**
 * TerrainBrush.ts
 *
 * Editor tools for sculpting and painting terrain heightmaps.
 * Supports raise, lower, flatten, smooth, and texture paint brushes.
 *
 * @module environment
 */
import { TerrainSystem } from './TerrainSystem';
export type BrushMode = 'raise' | 'lower' | 'flatten' | 'smooth' | 'paint';
export interface BrushConfig {
    mode: BrushMode;
    radius: number;
    strength: number;
    falloff: number;
    flattenHeight?: number;
    paintLayerId?: string;
}
export interface BrushStroke {
    terrainId: string;
    gridX: number;
    gridZ: number;
    config: BrushConfig;
    affectedCells: {
        x: number;
        z: number;
        oldHeight: number;
        newHeight: number;
    }[];
}
export declare class TerrainBrush {
    private config;
    private terrain;
    private undoStack;
    private redoStack;
    constructor(terrain: TerrainSystem, config?: Partial<BrushConfig>);
    setConfig(config: Partial<BrushConfig>): void;
    getConfig(): BrushConfig;
    setMode(mode: BrushMode): void;
    setRadius(radius: number): void;
    setStrength(strength: number): void;
    /**
     * Apply the brush at a grid position on a terrain.
     */
    apply(terrainId: string, gridX: number, gridZ: number): BrushStroke;
    undo(): BrushStroke | null;
    redo(): BrushStroke | null;
    getUndoCount(): number;
    getRedoCount(): number;
}
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