/**
 * IUFOEntranceAnimator - Handles UFO entrance animation logic
 *
 * Pure animation calculator for UFO appearance effects.
 * Supports fade, warp, zoom, and descend entrance types.
 */
import type { UFOEntranceType } from "../domain/ufo-types.js";
/**
 * Input state for entrance animation calculation
 */
export interface EntranceAnimationInput {
    stateTimer: number;
    enterDuration: number;
    entranceType: UFOEntranceType;
    startY: number;
    targetY: number;
}
/**
 * Result of entrance animation calculation
 */
export interface EntranceAnimationResult {
    opacity: number;
    scale: number;
    flashIntensity: number;
    y: number;
    isComplete: boolean;
}
export interface IUFOEntranceAnimator {
    /**
     * Calculate entrance animation state based on progress
     * Pure function - no side effects
     */
    calculate(input: EntranceAnimationInput): EntranceAnimationResult;
}
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