import { IRect, IMargin, DocController } from '../doc_controller';
import { IPdfBrick } from '../pdf_render/pdf_brick';
/**
 * Horizontal alignment types in onRenderHeader and onRenderFooter events
 */
export declare enum HorizontalAlign {
    NotSet = "notset",
    Left = "left",
    Center = "center",
    Right = "right"
}
/**
 * Vertical alignment types in onRenderHeader and onRenderFooter events
 */
export declare enum VerticalAlign {
    NotSet = "notset",
    Top = "top",
    Middle = "middle",
    Bottom = "bottom"
}
export interface IDrawRectOptions {
    /**
     * Horizontal alignment within the rectangle that limits the drawing area.
     *
     * Possible values:
     *
     * - `"center"` (default)
     * - `"left"`
     * - `"right"`
     */
    horizontalAlign?: HorizontalAlign;
    /**
     * Vertical alignment within the rectangle that limits the drawing area.
     *
     * Possible values:
     *
     * - `"middle"` (default)
     * - `"top"`
     * - `"bottom"`
     */
    verticalAlign?: VerticalAlign;
    /**
     * The distance between the content and the borders of the rectangle. This property applies only if the content is aligned to the left/right or top/bottom.
     */
    margins?: IMargin;
    /**
     * An object with coordinates of the rectangle.
     */
    rect?: IRect;
}
/**
 * An object that configures rendering a piece of text.
 */
export interface IDrawTextOptions extends IDrawRectOptions {
    /**
     * A text string to be drawn.
     */
    text: string;
    /**
     * Font size in points.
     *
     * Default value: 14
     */
    fontSize?: number;
    /**
     * Enable this property to render the text string bold.
     *
     * Default value: `false`
     */
    isBold?: boolean;
}
/**
 * An object that configures rendering an image.
 */
export interface IDrawImageOptions extends IDrawRectOptions {
    /**
     * An image width in pixels. Defaults to the [rectangle width](https://surveyjs.io/pdf-generator/documentation/api-reference/idrawimageoptions#rect).
     */
    width?: number;
    /**
     * An image height in pixels. Defaults to the [rectangle height](https://surveyjs.io/pdf-generator/documentation/api-reference/idrawimageoptions#rect).
     */
    height?: number;
    /**
     * A string value with a base64-encoded image to be drawn.
     */
    base64: string;
    /**
     * Specifies how to resize the image to fit it into its container.
     *
     * Default value: `"contain"` if [`applyImageFit`](https://surveyjs.io/pdf-generator/documentation/api-reference/idocoptions#applyImageFit) is enabled or `undefined` if not.
     *
     * Refer to the [`object-fit`](https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit) CSS property description for information on accepted values.
     */
    imageFit?: string;
}
/**
 * An object that describes a drawing area and enables you to draw an image or a piece of text within the area. You can access this object within functions that handle `SurveyPDF`'s [`onRenderHeader`](https://surveyjs.io/pdf-generator/documentation/api-reference/surveypdf#onRenderHeader) and [`onRenderFooter`](https://surveyjs.io/pdf-generator/documentation/api-reference/surveypdf#onRenderFooter) events.
 *
 * [View Demo](https://surveyjs.io/pdf-generator/examples/customize-header-and-footer-of-pdf-form/ (linkStyle))
 */
export declare class DrawCanvas {
    packs: IPdfBrick[];
    controller: DocController;
    protected _rect: IRect;
    protected _countPages: number;
    protected _pageNumber: number;
    constructor(packs: IPdfBrick[], controller: DocController, _rect: IRect, _countPages: number, _pageNumber: number);
    /**
     * A total number of pages in the document.
     */
    get pageCount(): number;
    get countPages(): number;
    /**
     * The number of the page that contains the drawing area. Enumeration starts with 1.
     */
    get pageNumber(): number;
    /**
     * An object with coordinates of a rectangle that limits the drawing area. This object contain the following fields: `xLeft`, `xRight`, `yTop`, `yBot`.
     */
    get rect(): IRect;
    private alignRect;
    /**
     * Draws a piece of text within the drawing area.
     *
     * [View Demo](https://surveyjs.io/pdf-generator/examples/customize-header-and-footer-of-pdf-form/ (linkStyle))
     * @param textOptions An [`IDrawTextOptions`](https://surveyjs.io/pdf-generator/documentation/api-reference/idrawtextoptions) object that configures the drawing.
     */
    drawText(textOptions: IDrawTextOptions): void;
    /**
     * Draws an image within the drawing area.
     *
     * [View Demo](https://surveyjs.io/pdf-generator/examples/customize-header-and-footer-of-pdf-form/ (linkStyle))
     * @param imageOptions An [`IDrawImageOptions`](https://surveyjs.io/pdf-generator/documentation/api-reference/idrawimageoptions) object that configures drawing.
     */
    drawImage(imageOptions: IDrawImageOptions): Promise<void>;
}