import { AcGePoint3dLike } from '@mlightcad/geometry-engine';
import { AcDbEntity } from './AcDbEntity';
/**
 * Abstract base class for all curve entities.
 *
 * This class provides the fundamental functionality for all curve entities,
 * including the ability to determine if a curve is closed. A curve is
 * considered closed if its start point is identical to its end point.
 *
 * @example
 * ```typescript
 * class MyCurve extends AcDbCurve {
 *   get closed(): boolean {
 *     // Implementation to determine if curve is closed
 *     return this.startPoint.equals(this.endPoint);
 *   }
 * }
 * ```
 */
export declare abstract class AcDbCurve extends AcDbEntity {
    /** The entity type name */
    static typeName: string;
    /**
     * Returns true if the curve is closed.
     *
     * A curve is considered closed if its start point is identical to its end point.
     * This property is used by various operations that need to know if a curve
     * forms a complete loop.
     *
     * @returns True if the curve is closed, false otherwise
     *
     * @example
     * ```typescript
     * const curve = new AcDbCircle();
     * console.log('Is circle closed?', curve.closed); // true
     *
     * const line = new AcDbLine();
     * console.log('Is line closed?', line.closed); // false
     * ```
     */
    abstract get closed(): boolean;
    /**
     * Creates offset curves at the given signed distance, similar to ObjectARX
     * `AcDbCurve::getOffsetCurves`.
     *
     * The sign of `offsetDist` determines the offset side relative to the curve
     * direction in the curve plane. Returns an empty array when offsetting fails.
     *
     * @param offsetDist - Signed offset distance in drawing units
     * @returns Offset curve entities (equivalent to `AcDbVoidPtrArray`)
     */
    abstract getOffsetCurves(offsetDist: number): AcDbCurve[];
    /**
     * Determines which side of this curve a point lies on for offset operations.
     *
     * @param point - Test point in WCS
     * @returns `1` for the positive offset side, `-1` for the negative side
     */
    getOffsetSideAtPoint(_point: AcGePoint3dLike): 1 | -1;
}
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