import { Vector2, Vector3 } from 'three';

/**
 * 使用凸起值计算两点之间曲线的点。通常用于折线
 * @param startPoint - 曲线的起点
 * @param endPoint - 曲线的终点
 * @param bulge - 凸起值：表示要弯曲多少的值
 * @param {number} segments - 曲线的分段数
 */
export declare function getBulgeCurvePoints(startPoint: {
    x: number;
    y: number;
}, endPoint: {
    x: number | undefined;
    y: number | undefined;
}, bulge: number, segments?: number | undefined): Vector3[];
/**
 * 插值一条b样条。该算法检查结向量以创建分段进行插值。参数化值被重新归一化为[0,1]，因为这是库所期望的(并且在b样条库中被反归一化)
 * @param controlPoints the control points
 * @param degree the b-spline degree
 * @param knots the knot vector
 * @returns the polyline
 */
export declare function getBSplinePolyline(controlPoints: any, degree: any, knots: any, interpolationsPerSplineSegment: any, weights: any): Vector2[];
export declare function addTriangleFacingCamera(verts: any, p0: any, p1: any, p2: any): void;
export declare function mtextContentAndFormattingToTextAndStyle(textAndControlChars: any, entity: any, color: any): {
    text: string;
    style: {
        horizontalAlignment: string;
        textHeight: any;
    };
};
export declare function createTextForScene(text: any, style: any, entity: any, color: any, fontUrl: string): any;
export declare function findExtents(scene: any): {
    min: {
        x: any;
        y: any;
    };
    max: {
        x: any;
        y: any;
    };
};