/**
 * Pure time↔pixel conversion utilities.
 *
 * Extracted so ruler, playhead, every lane, and every interaction handler
 * share a single formula. Drift between any two producers is the classic
 * timeline-editor bug; this module prevents it.
 */
export interface ViewportCoords {
    /** Current zoom level. */
    pxPerSecond: number;
    /** Time (seconds) at x=0 in the lane area. */
    scrollSec: number;
    /** Measured lane-area pixel width. */
    containerWidth: number;
    /** Canonical doc duration (seconds). */
    duration: number;
}
export declare const MIN_PX_PER_SEC = 4;
export declare const MAX_PX_PER_SEC = 400;
export declare function clampPxPerSec(v: number): number;
/**
 * Clamp scrollSec so the viewport stays inside [0, duration]. If the viewport
 * is wider than the doc (zoomed way out), scrollSec is pinned to 0.
 */
export declare function clampScrollSec(s: number, duration: number, pxPerSec: number, containerWidth: number): number;
export declare function timeToX(t: number, v: {
    pxPerSecond: number;
    scrollSec: number;
}): number;
export declare function xToTime(x: number, v: {
    pxPerSecond: number;
    scrollSec: number;
}): number;
/**
 * Zoom by `factor` while keeping `cursorX` pinned to the same time.
 * factor > 1 zooms in, factor < 1 zooms out.
 */
export declare function zoomAtCursor(v: ViewportCoords, factor: number, cursorX: number): {
    pxPerSecond: number;
    scrollSec: number;
};
/**
 * Fit the full duration into the lane area. If container not yet measured,
 * returns MIN_PX_PER_SEC as a safe default.
 */
export declare function fitViewport(duration: number, containerWidth: number): {
    pxPerSecond: number;
    scrollSec: number;
};
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