/**
 * Wind Animator
 *
 * Animates trees, grass, and ground vegetation with realistic wind effects.
 * Uses layered sine waves and noise for organic movement:
 * - Primary sway (slow, large motion)
 * - Secondary sway (faster, smaller)
 * - Gusts (occasional stronger bursts)
 * - Height-based scaling (trunk still, tips move most)
 */
export interface WindConfig {
    enabled: boolean;
    strength: number;
    direction: number;
    frequency: number;
    secondaryStrength: number;
    secondaryFrequency: number;
    gustEnabled: boolean;
    gustStrength: number;
    gustFrequency: number;
    gustDuration: number;
    heightExponent: number;
    trunkStiffness: number;
    spatialVariation: number;
    temporalVariation: number;
}
export interface WindState {
    time: number;
    currentStrength: number;
    gustActive: boolean;
    gustIntensity: number;
    gustTimeRemaining: number;
}
export interface WindDisplacement {
    x: number;
    y: number;
    rotation: number;
}
export declare class WindAnimator {
    private config;
    private noise;
    private state;
    constructor(config?: Partial<WindConfig>, seed?: number);
    /**
     * Update wind state
     * @param deltaTime Time since last update in seconds
     */
    update(deltaTime: number): void;
    private updateGusts;
    /**
     * Calculate displacement for a point at given position and height
     * @param worldX World X position
     * @param worldY World Y position
     * @param heightRatio 0-1, 0 = ground, 1 = top of element
     * @param scale Size multiplier for the element
     */
    getDisplacement(worldX: number, worldY: number, heightRatio: number, scale?: number): WindDisplacement;
    /**
     * Calculate displacement for grass blade
     * Grass is more responsive to wind
     */
    getGrassDisplacement(worldX: number, heightRatio: number): WindDisplacement;
    /**
     * Get current wind state for UI display
     */
    getState(): WindState;
    /**
     * Get effective wind strength at current moment
     */
    getCurrentStrength(): number;
    /**
     * Check if a gust is currently active
     */
    isGustActive(): boolean;
    /**
     * Manually trigger a gust
     */
    triggerGust(): void;
    /**
     * Set wind configuration
     */
    setConfig(config: Partial<WindConfig>): void;
    getConfig(): WindConfig;
    /**
     * Reset animation state
     */
    reset(): void;
}
/**
 * Wind presets for different moods
 */
export declare const WIND_PRESETS: Record<string, Partial<WindConfig>>;
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