import { DataOptions, Options, Region, State } from './types.js';
import { Chart } from '../chart.js';
/**
 * Generates an interactive psychrometric chart with plotting capabilities.
 */
export declare class Psychart extends Chart<Options> {
    /**
     * Defines the string representations of the current unit system.
     */
    private readonly units;
    /**
     * Defines a scaling factor for humidity ratio.
     */
    private readonly scaleFactor;
    /**
     * Represents the legend for Psychart.
     */
    private readonly legend;
    /**
     * Legend definitions, which contains linear gradients.
     */
    private readonly legendDefs;
    /**
     * The base element for adding lines in the legend.
     */
    private readonly legendg;
    /**
     * Defines all the groups in the SVG ordered by layer.
     */
    private readonly g;
    /**
     * The data series plotted on Psychart with each of their last states and visibility toggles.
     */
    private series;
    /**
     * The serial number for identified points.
     */
    private pointId;
    /**
     * Helper function to return an array of region names and their corresponding tooltips.
     */
    static getRegionNamesAndTips(): [Region, string][];
    /**
     * Convert from Celsius to Fahrenheit.
     */
    private static CtoF;
    /**
     * Get a range of numbers used for an axis.
     */
    private static getRange;
    /**
     * Construct a new instance of `Psychart` given various configuration properties.
     */
    constructor(options?: Partial<Options>);
    /**
     * Interpolate between "corner" psychrometric states.
     */
    private interpolate;
    /**
     * Generate SVG path data from an array of psychrometric states.
     */
    private setPathData;
    /**
     * Create an SVG circle element.
     */
    private createCircle;
    /**
     * Draw an axis line given an array of psychrometric states.
     */
    private drawAxis;
    /**
     * Create a line to append onto a parent element.
     */
    private createLine;
    /**
     * Draw an axis label.
     */
    private drawLabel;
    /**
     * Add a line to the legend.
     */
    private addToLegend;
    /**
     * Compute the height of the legend, in pixels.
     */
    private getLegendHeight;
    /**
     * Plot one psychrometric state onto the psychrometric chart.
     */
    plot(state: State, config?: Partial<DataOptions>): void;
    /**
     * Draw a shaded region on Psychart.
     */
    private drawRegion;
    /**
     * Clear all plotted data from Psychart.
     */
    clearData(): void;
    /**
     * Calculate the (x,y) coordinates for any state.
     * Note: Relative humidity must be in range [0.0-1.0]
     */
    getXY(state: State): import("./types.js").Point;
}