import type { PositionedArc, SunburstLabelRotation, SunburstShape } from '../core/utils/hierarchy-layout';
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 interface SunburstGroupGap<Metadata = Record<string, unknown>> {
    select: (arc: PositionedArc<Metadata>) => boolean;
    gap_px: number;
    max_fraction?: number;
}
interface ProjectArcsOptions<Metadata = Record<string, unknown>> {
    group_gap?: SunburstGroupGap<Metadata> | null;
}
export declare function project_arcs<Metadata>(arcs: PositionedArc<Metadata>[], win: ViewWindow, geom: ScreenGeometry, { group_gap }?: ProjectArcsOptions<Metadata>): {
    all: ScreenArc<Metadata>[];
    visible: ScreenArc<Metadata>[];
};
export declare function arc_label_transform(d: {
    a0: number;
    a1: number;
    r0: number;
    r1: number;
}, text_w: number, // rendered text width in px (pre-multiplied by font_scale)
shape: SunburstShape, rotation: SunburstLabelRotation, max_radius?: number, font_scale?: number): string | null;
export {};