import type { UIPlaneElement, UIPointElement } from "../../miscellaneous/shared";
import { UISingleParameterConstraint } from "../UISingleParameterConstraint/UISingleParameterConstraint";
import type { UIHorizontalInterpolationConstraintOptions } from "./UIHorizontalInterpolationConstraint.Internal";
/** Positions element C horizontally between A and B based on interpolation factor */
export declare class UIHorizontalInterpolationConstraint extends UISingleParameterConstraint {
    readonly a: UIPointElement | UIPlaneElement;
    readonly b: UIPointElement | UIPlaneElement;
    readonly c: UIPointElement | UIPlaneElement;
    /** Solver constraint descriptor */
    protected readonly constraint: number;
    /** Anchor on element A */
    private anchorAInternal;
    /** Anchor on element B */
    private anchorBInternal;
    /** Anchor on element C */
    private anchorCInternal;
    /** Interpolation factor */
    private tInternal;
    /**
     * @param a First element
     * @param b Second element
     * @param c Element to position between A and B
     * @param options Interpolation configuration
     */
    constructor(a: UIPointElement | UIPlaneElement, b: UIPointElement | UIPlaneElement, c: UIPointElement | UIPlaneElement, options?: Partial<UIHorizontalInterpolationConstraintOptions>);
    /** Interpolation factor (0 = A position, 1 = B position) */
    get t(): number;
    /** Anchor on element A (0 = left, 0.5 = center, 1 = right) */
    get anchorA(): number;
    /** Anchor on element B (0 = left, 0.5 = center, 1 = right) */
    get anchorB(): number;
    /** Anchor on element C (0 = left, 0.5 = center, 1 = right) */
    get anchorC(): number;
    /** Updates interpolation factor */
    set t(value: number);
    /** Updates anchor on element A */
    set anchorA(value: number);
    /** Updates anchor on element B */
    set anchorB(value: number);
    /** Updates anchor on element C */
    set anchorC(value: number);
    /** Builds constraint expression: C - A*(1-t) - B*t = 0 */
    private buildLHS;
}