import { BarChartOrientation, ChartReferenceLine, ChartReferenceLineAxis } from "../types";
import { ChartLayout } from "./getChartLayout";
export type ChartReferenceLineGeometry = {
    x1: number;
    y1: number;
    x2: number;
    y2: number;
};
export declare function isReferenceLineInScale(value: number, maxValue: number): boolean;
export declare function getValueX(value: number, maxValue: number, chartLayout: Pick<ChartLayout, "paddingLeft" | "chartWidth">): number;
export declare function getReferenceLineGeometry(value: number, maxValue: number, chartLayout: Pick<ChartLayout, "paddingLeft" | "paddingTop" | "chartWidth" | "chartHeight">, orientation: BarChartOrientation, _axis?: ChartReferenceLineAxis): ChartReferenceLineGeometry | null;
export type ReferenceLineLegendItem = {
    /** 凡例の React key。label が重複しても一意にする */
    id?: string;
    label: string;
    color: string;
};
/** 参照線を凡例用アイテムに変換する（スケール外でも凡例には残す） */
export declare function getReferenceLineLegendItems(lines: readonly ChartReferenceLine[] | undefined, valueFormatter: (value: number) => string, defaultColor: string): ReferenceLineLegendItem[];
/** SVG stroke-dasharray を凡例スウォッチの background に変換する */
export declare function getReferenceLineSwatchBackground(color: string, dasharray: string): {
    backgroundColor: string;
    backgroundImage: string;
};