import { AcGeBox3d, AcGeMatrix3d, AcGePoint3d } from '@mlightcad/geometry-engine';
import { AcGiEntity, AcGiRenderer, AcGiViewport } from '@mlightcad/graphic-interface';
import { AcDbDxfFiler } from '../base';
import { AcDbEntity } from './AcDbEntity';
/**
 * Represents a viewport entity in AutoCAD drawings.
 *
 * A viewport is a rectangular window that displays a portion of the drawing model space
 * within paper space layouts. Viewports allow users to create multiple views of the same
 * drawing at different scales and orientations on a single sheet.
 *
 * Key characteristics:
 * - Viewports exist primarily in paper space layouts
 * - Each viewport has a unique ID number (except the default system viewport with ID 1)
 * - Viewports can be active or inactive
 * - The viewport entity itself is drawn as a rectangular border in paper space
 *
 * @example
 * ```typescript
 * const viewport = new AcDbViewport();
 * viewport.centerPoint = new AcGePoint3d(0, 0, 0);
 * viewport.width = 10;
 * viewport.height = 8;
 * viewport.number = 2;
 * ```
 */
export declare class AcDbViewport extends AcDbEntity {
    /** The entity type name */
    static typeName: string;
    get dxfTypeName(): string;
    private _centerPoint;
    private _height;
    private _width;
    private _viewCenter;
    private _viewHeight;
    private _number;
    /**
     * Creates a new AcDbViewport instance.
     *
     * Initializes all properties with default values:
     * - centerPoint: origin (0,0,0)
     * - height: 0
     * - width: 0
     * - viewCenter: origin (0,0,0)
     * - viewHeight: 0
     * - number: -1 (indicating inactive viewport)
     */
    constructor();
    /**
     * Gets or sets the viewport ID number.
     *
     * This is the number that is reported by the AutoCAD CVPORT system variable
     * when the viewport is the current viewport in the AutoCAD editor. If the viewport is inactive, -1
     * is returned.
     *
     * Important notes:
     * - This value is not saved with the drawing, and changes each time the drawing is opened
     * - Viewport ID 1 is reserved for the system-defined default viewport in paper space
     * - Active viewports have IDs greater than 1
     * - Inactive viewports return -1
     *
     * @returns The viewport ID number
     */
    get number(): number;
    set number(value: number);
    /**
     * Gets or sets the center point of the viewport entity in WCS coordinates (within Paper Space).
     *
     * This point represents the geometric center of the viewport's rectangular boundary
     * in paper space coordinates, not the center of the model space view within the viewport.
     *
     * @returns The center point of the viewport entity
     */
    get centerPoint(): AcGePoint3d;
    set centerPoint(value: AcGePoint3d);
    /**
     * Gets or sets the height of the viewport entity's window in drawing units.
     *
     * This represents the height of the viewport's rectangular boundary in paper space,
     * measured in the current drawing units. It defines the vertical extent of the
     * viewport border, not the height of the model space view within it.
     *
     * @returns The height of the viewport entity in drawing units
     */
    get height(): number;
    set height(value: number);
    /**
     * Gets or sets the width of the viewport entity's window in drawing units.
     *
     * This represents the width of the viewport's rectangular boundary in paper space,
     * measured in the current drawing units. It defines the horizontal extent of the
     * viewport border, not the width of the model space view within the viewport.
     *
     * Note: This is the width in Paper Space of the viewport itself, not the width
     * of the Model Space view within the viewport.
     *
     * @returns The width of the viewport entity in drawing units
     */
    get width(): number;
    set width(value: number);
    /**
     * Gets or sets the view center in display coordinate system coordinates.
     *
     * This point represents the center of the model space view that is displayed
     * within the viewport. It is specified in the display coordinate system and
     * determines what portion of the model space drawing is visible in the viewport.
     *
     * @returns The center point of the model space view within the viewport
     */
    get viewCenter(): AcGePoint3d;
    set viewCenter(value: AcGePoint3d);
    /**
     * Gets or sets the height of the Model Space view within the viewport.
     *
     * This value represents the height of the model space view that is displayed
     * within the viewport, specified in display coordinate system coordinates.
     *
     * Zoom behavior:
     * - Zooming the view out within the viewport increases this value
     * - Zooming the view in within the viewport decreases this value
     *
     * @returns The height of the model space view in display coordinates
     */
    get viewHeight(): number;
    set viewHeight(value: number);
    /**
     * Gets the geometric extents of the viewport entity.
     *
     * This method returns a bounding box that encompasses the entire viewport entity
     * in world coordinate system (WCS) coordinates.
     *
     * @returns A bounding box containing the viewport entity
     * @inheritdoc
     */
    get geometricExtents(): AcGeBox3d;
    /**
     * Transforms this viewport entity by the specified matrix.
     */
    transformBy(matrix: AcGeMatrix3d): this;
    /**
     * Renders the viewport entity using the specified renderer.
     *
     * The viewport is drawn as a rectangular border when the following conditions are met:
     * - The viewport entity is not in model space (i.e., it's in paper space)
     * - The viewport ID number is greater than 1 (not the default system viewport)
     *
     * In paper space layouts, there is always a system-defined "default" viewport that exists as
     * the bottom-most item. This viewport doesn't show any entities and is mainly for internal
     * AutoCAD purposes. The viewport ID number of this system-defined "default" viewport is 1.
     *
     * @param renderer - The renderer to use for drawing the viewport
     * @returns A render group containing the viewport border lines, or undefined if not drawn
     */
    subWorldDraw(renderer: AcGiRenderer): AcGiEntity | undefined;
    /**
     * Converts this AcDbViewport to an AcGiViewport for rendering purposes.
     *
     * This method creates a graphic interface viewport object that contains all the
     * necessary properties for rendering the viewport in the graphics system.
     *
     * @returns An AcGiViewport instance with all viewport properties copied
     */
    toGiViewport(): AcGiViewport;
    /**
     * Creates the rectangular border lines for the viewport.
     *
     * This private method generates four line entities that form a rectangle representing
     * the viewport's boundary. The rectangle is centered on the viewport's center point
     * and has dimensions specified by the viewport's width and height.
     *
     * @param viewport - The graphic interface viewport containing rendering properties
     * @param renderer - The renderer to use for creating the line entities
     * @returns An array of line entities forming the viewport border
     * @private
     */
    private createViewportRect;
    /**
     * Writes DXF fields for this object.
     *
     * @param filer - DXF output writer.
     * @returns The instance (for chaining).
     */
    dxfOutFields(filer: AcDbDxfFiler): this;
}
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