import { PolarData, PolarMode } from '../types';

/**
 * Convert polar coordinates to Cartesian coordinates
 *
 * @param r - Radial values (distance from origin)
 * @param theta - Angular values
 * @param angleMode - 'degrees' or 'radians'
 * @returns Interleaved [x, y] vertex data
 */
export declare function polarToCartesian(r: Float32Array | Float64Array | number[], theta: Float32Array | Float64Array | number[], angleMode?: PolarMode): Float32Array;
/**
 * Prepare polar data for line rendering with optional path closing
 *
 * @param data - Polar coordinate data
 * @param angleMode - Angular unit mode
 * @param closePath - Whether to connect last point to first
 * @returns Cartesian vertex data
 */
export declare function interleavePolarLineData(data: PolarData, angleMode?: PolarMode, closePath?: boolean): Float32Array;
/**
 * Prepare polar data for filled area rendering
 * Creates triangles from origin to each line segment
 *
 * @param data - Polar coordinate data
 * @param angleMode - Angular unit mode
 * @param closePath - Whether to close the path
 * @returns Triangle vertex data for gl.TRIANGLES
 */
export declare function interleavePolarFillData(data: PolarData, angleMode?: PolarMode, closePath?: boolean): Float32Array;
/**
 * Generate polar grid lines (radial and angular)
 *
 * @param maxRadius - Maximum radial value
 * @param radialDivisions - Number of concentric circles
 * @param angularDivisions - Number of radial lines (spokes)
 * @param angleMode - Angular unit mode
 * @returns Object with radial and angular grid line data
 */
export declare function generatePolarGrid(maxRadius: number, radialDivisions?: number, angularDivisions?: number, angleMode?: PolarMode): {
    radialLines: Float32Array;
    angularLines: Float32Array;
};
/**
 * Calculate bounds for polar data
 *
 * @param data - Polar coordinate data
 * @returns Cartesian bounds {xMin, xMax, yMin, yMax}
 */
export declare function calculatePolarBounds(data: PolarData): {
    xMin: number;
    xMax: number;
    yMin: number;
    yMax: number;
    maxRadius: number;
};
/**
 * Normalize angular values to [0, 360) degrees or [0, 2π) radians
 *
 * @param theta - Angular values
 * @param angleMode - Angular unit mode
 * @returns Normalized angles
 */
export declare function normalizeAngles(theta: Float32Array | Float64Array | number[], angleMode?: PolarMode): Float32Array;