import { BaseType, Selection } from 'd3-selection';
import { HierarchyPointNode } from 'd3-hierarchy';
import { Chart, ChartInfo, ChartOptions, Fam, Indi, TreeNode } from './api';
import { ChartUtil, ChartSizeInfo } from './chart-util';
/** Renders a fancy descendants tree chart.
 *
 * It draws stylized leaves (colored circles behind individuals), organic branch paths,
 * and a decorative tree trunk at the base of the tree.
 * The layout uses D3 data binding to allow smooth updates and re-rendering.
 */
export declare class FancyChart<IndiT extends Indi, FamT extends Fam> implements Chart {
    readonly options: ChartOptions;
    readonly util: ChartUtil;
    constructor(options: ChartOptions);
    /** Creates a path from parent to the child node (vertical layout). */
    private linkVertical;
    private linkAdditionalMarriage;
    /**
     * Renders the two-tone background blocks (cyan "sky" above, green "grass" below).
     * Keeps them at the back of the SVG container by inserting them before any other elements.
     */
    renderBackground(chartInfo: ChartSizeInfo, svg: Selection<BaseType, {}, BaseType, {}>): void;
    /**
     * Renders stylized circular green backdrops ("leaves") behind all descendant family tree nodes.
     * A radial gradient is created (and reused) to give the outer ring of nodes a soft glowing edge.
     */
    renderLeaves(nodes: Array<HierarchyPointNode<TreeNode>>, svg: Selection<BaseType, {}, BaseType, {}>): void;
    /**
     * Renders the connection paths (branches) between family nodes.
     * Uses organic Bezier curves styled as tree branches rather than standard block lines.
     */
    renderLinks(nodes: Array<HierarchyPointNode<TreeNode>>, svg: Selection<BaseType, {}, BaseType, {}>): void;
    /**
     * Renders a decorative tree trunk at the base of the root node.
     */
    renderTreeTrunk(nodes: Array<HierarchyPointNode<TreeNode>>, svg: Selection<BaseType, {}, BaseType, {}>): void;
    /**
     * Lays out, scales, and draws the fancy descendant chart.
     */
    render(): ChartInfo;
}