/**
 * Arc the slices span. Omit for a full wheel (index 0 at the top). A partial
 * `sweep` (e.g. `Math.PI` for a bottom half, `Math.PI / 2` for a quarter) packs
 * the slices evenly inside `[startAngle, startAngle + sweep]` — the arc/quick-bar
 * forms. Angles are radians from "up" (−Y), clockwise.
 */
export interface RadialArc {
    startAngle?: number;
    sweep?: number;
}
/** One wedge of a radial menu — geometry for rendering a slice. Angles are radians from "up" (−Y), clockwise. */
export interface RadialSlice {
    index: number;
    /** Angle at the slice's center. */
    centerAngle: number;
    /** Leading edge angle. */
    startAngle: number;
    /** Trailing edge angle. */
    endAngle: number;
}
/**
 * Divide a ring (or `arc`) into `count` wedges — the geometry a radial/quick
 * menu (weapon wheel, emote arc, ping bar) renders. A full wheel centers index 0
 * at the top; a partial `arc` packs the slices inside its sweep.
 */
export declare function radialSlices(count: number, arc?: RadialArc): RadialSlice[];
/** Map an angle to a slice index; returns -1 when the angle falls outside a partial `arc`. */
export declare function radialIndexFromAngle(angle: number, count: number, arc?: RadialArc): number;
/** Options for {@link radialIndexFromVector}. */
export interface RadialVectorOptions extends RadialArc {
    /** Minimum vector magnitude to register a selection; shorter vectors return null (the neutral center). Default 0. */
    deadZone?: number;
}
/**
 * Pick the slice a pointer/stick vector points at. `dx`/`dy` are screen-space
 * (y down): up is `(0, -1)`. Returns null inside `deadZone` or (for a partial
 * `arc`) outside the arc, so a centered stick or a click off the arc selects
 * nothing.
 *
 * @capability radial-select map a pointer/stick vector to a radial-menu slice index, with a neutral dead zone and optional arc bounds
 */
export declare function radialIndexFromVector(dx: number, dy: number, count: number, options?: RadialVectorOptions): number | null;
/** Unit-circle position of a slice center (up = `(0, -1)`), scaled by `radius` — where to place a wedge's icon/label. */
export declare function radialSlicePosition(index: number, count: number, radius: number, arc?: RadialArc): {
    x: number;
    y: number;
};