export type PieSliceInput = {
    /** React key / 凡例トグル用。未指定時は label */
    id?: string;
    label: string;
    value: number;
    color: string;
};
export type PieSliceGeometry = {
    id: string;
    label: string;
    color: string;
    value: number;
    startAngle: number;
    endAngle: number;
    path: string;
};
/** 同名スライスを区別する内部キー */
export declare function getPieSliceKey(index: number, label: string): string;
export declare function getPieSliceDisplayLabel(seriesKey: string): string;
/** 凡例の last-1 ガード用。0 以下は描画しないのでカウントしない */
export declare function getPieDrawableSeriesLabels(series: readonly {
    label: string;
    data: readonly (number | null)[];
}[]): string[];
export declare function describeSlicePath(cx: number, cy: number, outerRadius: number, innerRadius: number, startAngle: number, endAngle: number): string;
export declare function hasPieChartData(data: readonly Pick<PieSliceInput, "value">[]): boolean;
/** 正の値だけを合計する（0 以下は無視） */
export declare function getPieTotal(data: readonly Pick<PieSliceInput, "value">[]): number;
export type PieSliceLabelGutterOptions = {
    labels?: readonly string[];
    fontSize?: number;
};
/** フォーマット済みラベルと fontSize から外側ラベル用の SVG 余白を取る */
export declare function getPieSliceLabelGutter(mode: "none" | "value" | "percent" | "both", options?: PieSliceLabelGutterOptions): {
    x: number;
    y: number;
};
export type PieSliceLabelLayout = {
    midAngle: number;
    lineStartX: number;
    lineStartY: number;
    lineEndX: number;
    lineEndY: number;
    textX: number;
    textY: number;
    textAnchor: "start" | "end";
    percent: number;
};
/** スライス色に対してコントラストが高い方のラベル色を返す。解析できない色は darkColor */
export declare function pickContrastingLabelColor(background: string, lightColor: string, darkColor: string): string;
export declare function resolvePieSliceLabelStyle(themeStyle: {
    fontSize: number;
    color: string;
}, override?: {
    fontSize?: number;
    color?: string;
}): {
    fontSize: number;
    color: string;
};
/** donut 中央の数値サイズ。穴とフォーマット済み文字列の幅から 12〜24 に収める */
export declare function getPieCenterTotalValueFontSize(innerRadius: number, formattedValue?: string): number;
export declare function resolvePieCenterTotalStyle(themeColor: string, autoFontSize: number, override?: {
    fontSize?: number;
    color?: string;
}): {
    fontSize: number;
    color: string;
    captionFontSize: number;
};
export declare function formatPieSliceLabel(value: number, total: number, mode: "value" | "percent" | "both", valueFormatter: (value: number) => string, percentFormatter: (value: number) => string): string;
export declare function getPieSliceLabelLayout(startAngle: number, endAngle: number, value: number, total: number, cx: number, cy: number, outerRadius: number): PieSliceLabelLayout | null;
export type PieSliceInnerLabelLayout = {
    x: number;
    y: number;
};
export declare function getPieSliceInnerLabelLayout(startAngle: number, endAngle: number, cx: number, cy: number, outerRadius: number, innerRadius: number): PieSliceInnerLabelLayout | null;
export declare function getPieSlices(data: readonly PieSliceInput[], cx: number, cy: number, outerRadius: number, innerRadius: number): PieSliceGeometry[];