import type { PositionedArc, SunburstLabelRotation, SunburstShape } from './sunburst';
export interface ScreenArc<Metadata = Record<string, unknown>> {
    arc: PositionedArc<Metadata>;
    a0: number;
    a1: number;
    r0: number;
    r1: number;
    visible: boolean;
}
export interface ViewWindow {
    x0: number;
    x1: number;
    y0: number;
    n_rings: number;
}
export interface ScreenGeometry {
    shape: SunburstShape;
    inner_width: number;
    inner_height: number;
    radius: number;
    hole_r: number;
}
export declare function project_arcs<Metadata>(arcs: PositionedArc<Metadata>[], win: ViewWindow, geom: ScreenGeometry): {
    all: ScreenArc<Metadata>[];
    visible: ScreenArc<Metadata>[];
};
export declare function arrow_nav_target<Metadata>(arcs: readonly PositionedArc<Metadata>[], is_visible: (idx: number) => boolean, current_idx: number, key: string): number | null;
export declare function arc_label_transform(d: {
    a0: number;
    a1: number;
    r0: number;
    r1: number;
}, text_w: number, // rendered text width in px
shape: SunburstShape, rotation: SunburstLabelRotation): string | null;