import { Color } from 'viridis';
import { ChartOptions, Point, TextAnchor } from './types.js';
/**
 * Represents a generic SVG chart to be inherited by another class.
 */
export declare abstract class Chart<T extends ChartOptions> {
    /**
     * Initialization counter for any chart
     */
    private static id_count;
    /**
     * Unique numeric identifier for this chart
     */
    protected readonly id: number;
    /**
     * SVG Namespace URI
     */
    protected readonly NS = "http://www.w3.org/2000/svg";
    /**
     * Options for this chart
     */
    protected readonly options: T;
    /**
     * Base `<div>` element
     */
    protected readonly base: HTMLDivElement;
    /**
     * The `<svg>` element used for rendering
     */
    protected readonly svg: SVGSVGElement;
    /**
     * Create a new instance of this chart.
     * @param options Supply some options to customize this chart.
     * @param defaults Supply all default options for this chart.
     */
    constructor(options: Partial<T>, defaults: T);
    /**
     * Produce a deep copy of an object.
     * @param obj Any object
     * @returns A deep copy of an object.
     */
    protected static deepCopy<Z>(obj: Z): Z;
    /**
     * Take an object with all optional values, and set all unset values to their defaults.
     * @param options An object with all parameters optional.
     * @param defaults An object with all parameters default.
     * @returns An object with all parameters that are unset as their default values.
     */
    protected static setDefaults<Z>(options: Partial<Z>, defaults: Z): Z;
    /**
     * Remove all the children from a parent element.
     * @param parent Any element to clear the children of
     */
    protected static clearChildren(parent: Node): void;
    /**
     * Generate a text element to append onto a parent element.
     * @param content The contents of the text element
     * @param location The location of the text element, in pixels
     * @param color The fill color of the text
     * @param anchor How the text is anchored relative to its location
     * @param rotation The text rotation in degrees from horizontal
     * @returns A `<text>` element
     */
    protected createLabel(content: string, location: Point, color: Color, anchor: TextAnchor, rotation: number): SVGTextElement;
    /**
     * Draw a tooltip onto the chart.
     * @param content The text content of the tooltip
     * @param location The position of the tooltip
     * @param color The background color
     * @param parent The element to append onto
     */
    protected drawTooltip(content: string, location: Point, color: Color, parent: SVGElement): void;
    /**
     * Return the base `<div>` element for this chart to append on the parent.
     * @returns The base element.
     */
    getElement(): HTMLDivElement;
}