import { EHorizontalAnchorPoint, EVerticalAnchorPoint } from "../../../types/AnchorPoint";
import { EAngularAxisLabelPlacement, ERadialAxisLabelPlacement } from "../../../types/LabelPlacement";
import { EPolarLabelMode } from "../Axis/Polar/types/PolarLabelMode";
declare function radiansToDegrees(r: number): number;
declare function normalizeAngle(a: number): number;
/**
 * Calculates label rotation for a polar chart with different label modes
 * @param mode - One of the following polar label modes {@link EPolarLabelMode}
 * @param angle - data point angle in radians
 * @returns an angle in radians to apply for the label when drawing
 */
declare function getPolarLabelRotation(mode: EPolarLabelMode, angle: number): number;
declare function getLabelPlacementForRadialAxis(radialAxisLabelPlacement: ERadialAxisLabelPlacement): EVerticalAnchorPoint;
declare function getLabelRotationAndPlacementForAngularAxis(radians: number, labelMode: EPolarLabelMode, angularAxisLabelPlacement: EAngularAxisLabelPlacement): {
    resultAngle: number;
    horizontalAnchorPoint: EHorizontalAnchorPoint;
    verticalAnchorPoint: EVerticalAnchorPoint;
};
export declare const labelHelper: {
    getPolarLabelRotation: typeof getPolarLabelRotation;
    radiansToDegrees: typeof radiansToDegrees;
    getLabelPlacementForRadialAxis: typeof getLabelPlacementForRadialAxis;
    getLabelRotationAndPlacementForAngularAxis: typeof getLabelRotationAndPlacementForAngularAxis;
    normalizeAngle: typeof normalizeAngle;
};
export {};