import { Rect } from "../../../Core/Rect";
import { BrushCache } from "../../Drawing/BrushCache";
import { Pen2DCache } from "../../Drawing/Pen2DCache";
import { WebGlRenderContext2D } from "../../Drawing/WebGlRenderContext2D";
import { CoordinateCalculatorBase } from "../../Numerics/CoordinateCalculators/CoordinateCalculatorBase";
import { SciChartSurface } from "../SciChartSurface";
import { EAnnotationType } from "./IAnnotation";
import { LineAnnotation, ILineAnnotationOptions } from "./LineAnnotation";
/**
 * Enumeration of possible positions for the arrow head inside a {@link LineArrowAnnotation}
 */
export declare enum EArrowHeadPosition {
    /**
     * The arrowhead will be at `x2y2`
     * Default value
     */
    End = "End",
    /**
     * The arrowhead will be at `x1y1`
     */
    Start = "Start",
    /**
     * One arrowhead will be at `x1y1` and another at `x2y2`
     */
    StartEnd = "StartEnd"
}
/**
 * Configuration for the arrowhead style
 */
export interface IArrowStyle {
    /** The length (height) of the arrow head in pixels
     * Default `10`
     */
    headLength?: number;
    /** The width of the arrow head in pixels
     * Default `8`
     */
    headWidth?: number;
    /**
     * The depth of the arrow head **relative** to the `arrowStyle.headLength` property.
     *
     * @note If `1`, the arrowhead will be an isosceles triangle
     * @note If `0.5`, the arrowhead will have sharp wings
     * @note If `0`, the arrow will not have a base nor a fill
     *
     * Default `0`
     */
    headDepth?: number;
    /** The fill color of the arrow head.
     * @note If `arrowStyle.headDepth = 0`, this property will be ignored
     *
     * Default `transparent`
     */
    fill?: string;
    /** The stroke color of the arrow head
     * Default `#FFFFFF`
     */
    stroke?: string;
    /** The stroke thickness of the arrow head in pixels
     * Default `1`
     */
    strokeThickness?: number;
}
/**
 * The type of the onArrowHeadSizeChanged callback function
 */
export declare type TArrowheadSizeChangedCallback = (args: {
    headLength: number;
    headWidth: number;
    headDepth: number;
    angle: number;
    x1: number;
    y1: number;
    x2: number;
    y2: number;
}) => {
    headLength?: number;
    headWidth?: number;
    headDepth?: number;
} | void;
/**
 * Options passed to the constructor of a {@link LineArrowAnnotation}, used to configure it at instantiation time
 */
export interface ILineArrowAnnotationOptions extends ILineAnnotationOptions {
    /** Configuration for the arrowhead style. See {@link IArrowStyle} for all properties */
    arrowStyle?: IArrowStyle;
    /** Position of the arrowhead(s) */
    arrowHeadPosition?: EArrowHeadPosition;
    /** Whether the arrowhead's size should be calculated relatively to zoom level of the chart or not
     *
     * @note If `true`, the arrowhead's width and height will scale along with the line annotation as you zoom the chart
     *
     * Default `false`
     */
    isArrowHeadScalable?: boolean;
    /**
     * Optional callback that allows customization of arrowhead parameters before drawing
     * @param args Object containing current arrowhead size parameters and line coordinates
     * @returns Modified parameters or void to use default values
     */
    onArrowHeadSizeChanged?: TArrowheadSizeChangedCallback | string;
}
/**
 * @summary The {@link LineArrowAnnotation} provides an {@link LineAnnotation} which draws 1 or 2 arrow heads at
 * x1y1, x2y2 coordinates over the {@link SciChartSurface}
 * @description
 * To add a {@link LineArrowAnnotation} to a {@link SciChartSurface}, use the following code:
 * ```ts
 * const sciChartSurface: SciChartSurface;
 * const lineArrowAnnotation = new LineArrowAnnotation({
 *   x1: 1, y1: 3, x2: 2, y2: 4,
 *   stroke: "#FFFFFF",
 *   arrowHeadPosition: EArrowHeadPosition.End,
 *   arrowStyle: {
 *     headLength: 10,
 *     headWidth: 8,
 *     headDepth: 0.8,
 *     fill: "#000000",
 *     stroke: "#FFFFFF",
 *     strokeThickness: 2,
 *   },
 *   arrowHeadPosition: EArrowHeadPosition.End,
 *   isArrowHeadScalable: true
 * });
 * sciChartSurface.annotations.add(lineArrowAnnotation);
 * ```
 * @remarks Uses the fast WebGL/WebAssembly {@link WebGL2RenderingContext} for rendering
 */
export declare class LineArrowAnnotation extends LineAnnotation {
    /** @inheritDoc */
    readonly type: EAnnotationType;
    protected arrowheadFillBrushCache: BrushCache;
    protected arrowheadStrokePenCache: Pen2DCache;
    private storedXRange;
    private storedYRange;
    private arrowStyleProperty;
    private arrowHeadPositionProperty;
    private isArrowHeadScalableProperty;
    private onArrowHeadSizeChangedCallback?;
    /**
     * Creates a proxy for the arrow style object to trigger updates when properties change
     */
    private getArrowStyleProxy;
    /**
     * Creates an instance of a LineArrowAnnotation
     * @param options Optional parameters of type {@link ILineArrowAnnotationOptions} which configure the annotation upon construction
     */
    constructor(options?: ILineArrowAnnotationOptions);
    /**
     * Gets the arrow style configuration
     */
    get arrowStyle(): IArrowStyle;
    /**
     * Sets the arrow style configuration
     */
    set arrowStyle(value: IArrowStyle);
    /**
     * Gets the position of the arrow head
     */
    get arrowHeadPosition(): EArrowHeadPosition;
    /**
     * Sets the position of the arrow head
     */
    set arrowHeadPosition(value: EArrowHeadPosition);
    /**
     * Gets whether the arrow head's sizes should be calculated relatively to the line length or not
     */
    get isArrowHeadScalable(): boolean;
    /**
     * Sets whether the arrow head's sizes should be calculated relatively to the line length or not
     */
    set isArrowHeadScalable(value: boolean);
    /** @inheritDoc */
    onAttach(scs: SciChartSurface): void;
    /**
     * Updates the fill brush and stroke pen for the arrowhead based on the current arrow style
     */
    private updateArrowheadBrushes;
    /** @inheritDoc */
    delete(): void;
    /** @inheritDoc */
    drawWithContext(renderContext: WebGlRenderContext2D, xCalc: CoordinateCalculatorBase, yCalc: CoordinateCalculatorBase, seriesViewRect: Rect, surfaceViewRect: Rect, chartViewRect: Rect): void;
    private drawLine;
    /**
     * Used internally to draw the arrow head at the specified coordinates
     */
    private drawArrowHead;
    /** @inheritDoc */
    protected notifyPropertyChanged(propertyName: string): void;
    /** @inheritDoc */
    toJSON(): {
        type: EAnnotationType;
        options: Required<Omit<import("./AnnotationBase").IAnnotationBaseOptions, never>>;
    };
}