/**
 * Ground Layer System
 *
 * Generates procedural ground vegetation:
 * - Bushes and shrubs
 * - Grass tufts
 * - Ferns and undergrowth
 * - Ground texture variation
 *
 * Creates the forest floor that grounds the tree silhouettes.
 */
export type GroundElementType = "bush" | "grass" | "fern" | "rock" | "stump";
export interface GroundElement {
    id: string;
    type: GroundElementType;
    x: number;
    y: number;
    width: number;
    height: number;
    depth: number;
    silhouettePoints: Array<{
        x: number;
        y: number;
    }>;
    opacity: number;
}
export interface GrassBlade {
    baseX: number;
    baseY: number;
    tipX: number;
    tipY: number;
    controlX: number;
    controlY: number;
    thickness: number;
    hueShift: number;
    brightness: number;
    tipGlow: boolean;
    layer: "carpet" | "mid" | "accent";
}
export interface GrassTuft {
    id: string;
    x: number;
    y: number;
    depth: number;
    blades: GrassBlade[];
    width: number;
    height: number;
}
export interface GroundLayerConfig {
    width: number;
    height: number;
    groundLineY: number;
    bushCount: number;
    bushMinSize: number;
    bushMaxSize: number;
    bushNoiseScale: number;
    bushNoiseAmplitude: number;
    grassTuftCount: number;
    bladesPerTuft: number;
    grassMinHeight: number;
    grassMaxHeight: number;
    grassCurvature: number;
    fernCount: number;
    fernMinSize: number;
    fernMaxSize: number;
    frondCount: number;
    clusteringStrength: number;
    depthLayers: number;
}
export declare class GroundLayerSystem {
    private config;
    private noise;
    private elements;
    private grassTufts;
    private idCounter;
    constructor(config?: Partial<GroundLayerConfig>, seed?: number);
    /**
     * Generate all ground elements
     */
    generate(): void;
    private generateLayerElements;
    private generateBush;
    private generateBushSilhouette;
    private generateGrassTuft;
    private generateFern;
    private generateFernSilhouette;
    /**
     * Get all ground elements for rendering
     */
    getElements(): GroundElement[];
    /**
     * Get all grass tufts for rendering
     */
    getGrassTufts(): GrassTuft[];
    /**
     * Get elements by type
     */
    getElementsByType(type: GroundElementType): GroundElement[];
    /**
     * Get elements at a specific depth layer
     */
    getElementsAtDepth(depth: number, tolerance?: number): GroundElement[];
    /**
     * Resize and regenerate
     */
    resize(width: number, height: number): void;
    getConfig(): GroundLayerConfig;
    getStats(): {
        totalElements: number;
        bushes: number;
        grassTufts: number;
        ferns: number;
        totalBlades: number;
    };
}
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