/*!
    *
    * Wijmo Library 5.20251.40
    * https://developer.mescius.com/wijmo
    *
    * Copyright(c) MESCIUS inc. All rights reserved.
    *
    * Licensed under the End-User License Agreement For MESCIUS Wijmo Software.
    * us.sales@mescius.com
    * https://developer.mescius.com/wijmo/licensing
    *
    */
/**
 * {@module wijmo.chart.webgl}
 * Includes WebGL rendering engine for FlexChart.
*/
/**
 *
 */
export declare var ___keepComment: any;
import * as core from 'wijmo/wijmo';
import * as chart from 'wijmo/wijmo.chart';
export declare class _EarCut {
    earcut(data: any, holeIndices?: any, dim?: any): number[];
    private linkedList;
    private filterPoints;
    private earcutLinked;
    private isEar;
    private isEarHashed;
    private cureLocalIntersections;
    private splitEarcut;
    private eliminateHoles;
    private compareX;
    private eliminateHole;
    private findHoleBridge;
    private sectorContainsSector;
    private indexCurve;
    private sortLinked;
    private zOrder;
    private getLeftmost;
    private pointInTriangle;
    private isValidDiagonal;
    private area;
    private equals;
    private intersects;
    private onSegment;
    private sign;
    private intersectsPolygon;
    private locallyInside;
    private middleInside;
    private splitPolygon;
    private insertNode;
    private removeNode;
    private deviation;
    private signedArea;
    private flatten;
}
/**
 * High performance rendering engine for a {@link FlexChart} control.
 *
 * To enable WebGL rendering on a {@link FlexChart} control,
 * set <b>renderEngine<b> property of {@link FlexChart} to
 * an instance of the {@link WebGLRenderEngine}. For example:
 *```typescript
 * import { FlexChart } from 'wijmo/wijmo.chart';
 * import { WebGLRenderEngine } from 'wijmo/wijmo.chart.webgl';
 * let flexChart = new FlexChart('#theGrid'); // create the chart
 * flexChart.renderEngine = new WebGLRenderEngine(); // set the render engine
 * ```
 */
export declare class WebGLRenderEngine extends chart._SvgRenderEngine {
    private static svgns;
    canvas: HTMLCanvasElement;
    foCanvas: SVGForeignObjectElement;
    private gl;
    private rdraw;
    private edraw;
    private pdraw;
    private ldraw;
    private adraw;
    private primitives;
    private isIE;
    useSvg: boolean;
    private clipRects;
    constructor(el?: HTMLElement);
    beginRender(): void;
    setViewportSize(w: number, h: number): void;
    endRender(): void;
    drawEllipse(cx: number, cy: number, rx: number, ry: number, className?: string, style?: any): SVGElement;
    _getGroupClipRect(e?: Element): core.Rect;
    drawRect(x: number, y: number, w: number, h: number, className?: string, style?: any, clipPath?: string): SVGElement;
    drawLines(xs: number[], ys: number[], className?: string, style?: any, clipPath?: string, num?: number): SVGElement;
    drawPolygon(xs: number[], ys: number[], className?: string, style?: any, clipPath?: string): SVGElement;
    addClipRect(clipRect: core.Rect, id: string): void;
    private init;
}