import type { ColumnDataMap } from "../../data/view-reader";
import type { WebGLContextManager } from "../../webgl/context-manager";
import { TreeChartBase } from "../common/tree-chart";
import { type SunburstBreadcrumbRegion } from "./sunburst-interact";
export interface SunburstLocations {
    u_center: WebGLUniformLocation | null;
    u_resolution: WebGLUniformLocation | null;
    u_border_px: WebGLUniformLocation | null;
    a_strip_t: number;
    a_side: number;
    a_angles: number;
    a_radii: number;
    a_color: number;
}
/**
 * Sunburst chart. Shares tree storage + streaming pipeline + color
 * mode with `TreeChartBase`; adds polar layout + instanced-arc WebGL
 * rendering + drill / tooltip interactions.
 *
 * Internal option: `_labelRotation` — `"upright"` keeps labels on the
 * left half flipped 180° so they read upright (d3fc behavior);
 * `"radial"` leaves them purely tangent to the arc. Defaults to
 * `"upright"`; toggle here if a call site wants flat radial labels.
 */
export declare class SunburstChart extends TreeChartBase {
    _program: WebGLProgram | null;
    _locations: SunburstLocations | null;
    _stripBuffer: WebGLBuffer | null;
    _instanceBuffer: WebGLBuffer | null;
    _instanceCount: number;
    /**
     * Label orientation mode — see class docstring.
     */
    _labelRotation: "upright" | "radial";
    _centerX: number;
    _centerY: number;
    _maxRadius: number;
    _hoveredNodeId: number;
    _pinnedNodeId: number;
    _breadcrumbRegions: SunburstBreadcrumbRegion[];
    _chromeCache: ImageBitmap | null;
    _chromeCacheDirty: boolean;
    /**
     * See `TreemapChart._chromeCacheGen` — same race, same fix.
     */
    _chromeCacheGen: number;
    _facetGrid: import("../../layout/facet-grid").FacetGrid | null;
    /**
     * Per-facet drill roots — mirrors `TreemapChart._facetDrillRoots`.
     */
    _facetDrillRoots: Map<string, number>;
    /**
     * Per-facet rendering state. `index` matches the facet grid cell;
     * `centerX`, `centerY`, `maxRadius` are used for layout + hit test;
     * `drillRoot` is the sub-root the facet is currently showing;
     * `instanceStart`, `instanceCount` index into the shared GPU
     * instance buffer for draw dispatch (these are post-skip values,
     * rewritten by `uploadArcInstances` after zero-width arcs and the
     * drill root are filtered out). `nodeStart`, `nodeCount` are the
     * pre-skip range over `_visibleNodeIds` and are *not* rewritten —
     * canvas chrome (arc-label translate origin) walks this range so
     * each label can be placed around its own facet's center instead
     * of the chart-wide `_centerX/_centerY` (which always point at the
     * first facet).
     */
    _facets: {
        label: string;
        centerX: number;
        centerY: number;
        maxRadius: number;
        drillRoot: number;
        instanceStart: number;
        instanceCount: number;
        nodeStart: number;
        nodeCount: number;
    }[];
    protected tooltipCallbacks(): {
        onHover: (mx: number, my: number) => void;
        onLeave: () => void;
        onClickPre: (mx: number, my: number) => boolean;
    };
    uploadAndRender(glManager: WebGLContextManager, columns: ColumnDataMap, startRow: number, _endRow: number): Promise<void>;
    _fullRender(glManager: WebGLContextManager): void;
    protected destroyInternal(): void;
}