/**
 * Representation of a point on a graph.
 */
export interface GraphPoint {
    /**
     * The value of the point.
     */
    value: number;
    /**
     * A label to name the point.
     */
    label: string;
    /**
     * The increased percentage on tangent graph.
     */
    increasePercent?: number;
}
/**
 * A non-visual graph to analyze variation in datas.
 */
export declare class LazyDataGraph {
    private _points;
    private isTan;
    /**
     * Create a new graph with some points.
     * @param {GraphPoint[]} datas An array of points on the graph.
     */
    constructor(...datas: GraphPoint[]);
    /**
     * Get the points on the graph.
     */
    get points(): GraphPoint[];
    /**
     * Set the points on the graph.
     */
    set points(pts: GraphPoint[]);
    /**
     * Check if the graph is a tangent graph or a root graph.
     * @returns {boolean} True if the graph is a tangent graph.
     */
    isTangentGraph(): boolean;
    /**
     * Get the tangent graph, showing the difference happening between each points and the increased / decreased percentage.
     * @returns {LazyDataGraph} The tangent graph.
     */
    getTangentGraph(): LazyDataGraph;
    /**
     * Generate a bunch of tangent points from this graph.
     * @returns {GraphPoint[]} The tangent points array.
     */
    generateSlope(): GraphPoint[];
}
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