/*
 * Copyright (c) 2021-2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file
 * @kit ArkUI
 */

/**
 * Contains interpolator functions such as initialization, third-order Bezier curves, and spring curves.
 *
 * @namespace curves
 * @syscap SystemCapability.ArkUI.ArkUI.Full
 * @since 7
 */
/**
 * Contains interpolator functions such as initialization, third-order Bezier curves, and spring curves.
 *
 * @namespace curves
 * @syscap SystemCapability.ArkUI.ArkUI.Full
 * @crossplatform
 * @since 10
 */
/**
 * Contains interpolator functions such as initialization, third-order Bezier curves, and spring curves.
 *
 * @namespace curves
 * @syscap SystemCapability.ArkUI.ArkUI.Full
 * @crossplatform
 * @atomicservice
 * @since 11
 */
/**
 * Contains interpolator functions such as initialization, third-order Bezier curves, and spring curves.
 *
 * @namespace curves
 * @syscap SystemCapability.ArkUI.ArkUI.Full
 * @crossplatform
 * @form
 * @atomicservice
 * @since 20
 * @arkts 1.1&1.2
 */
declare namespace curves {
  /**
   * enum Curve.
   *
   * @enum { number }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 7
   */
  /**
   * enum Curve.
   *
   * @enum { number }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * enum Curve.
   *
   * @enum { number }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since 11
   */
  /**
   * enum Curve.
   *
   * @enum { number }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @form
   * @atomicservice
   * @since 20
   * @arkts 1.1&1.2
   */
  export enum Curve {
    /**
     * Linear. Indicates that the animation has the same velocity from start to finish.
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Linear. Indicates that the animation has the same velocity from start to finish.
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Linear. Indicates that the animation has the same velocity from start to finish.
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Linear. Indicates that the animation has the same velocity from start to finish.
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Linear,
    /**
     * Ease. Indicates that the animation starts at a low speed, then speeds up, and slows down before the end,
     * CubicBezier(0.25, 0.1, 0.25, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Ease. Indicates that the animation starts at a low speed, then speeds up, and slows down before the end,
     * CubicBezier(0.25, 0.1, 0.25, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Ease. Indicates that the animation starts at a low speed, then speeds up, and slows down before the end,
     * CubicBezier(0.25, 0.1, 0.25, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Ease. Indicates that the animation starts at a low speed, then speeds up, and slows down before the end,
     * CubicBezier(0.25, 0.1, 0.25, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Ease,
    /**
     * EaseIn. Indicates that the animation starts at a low speed, Cubic Bezier (0.42, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * EaseIn. Indicates that the animation starts at a low speed, Cubic Bezier (0.42, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * EaseIn. Indicates that the animation starts at a low speed, Cubic Bezier (0.42, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * EaseIn. Indicates that the animation starts at a low speed, Cubic Bezier (0.42, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    EaseIn,
    /**
     * EaseOut. Indicates that the animation ends at low speed, CubicBezier (0.0, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * EaseOut. Indicates that the animation ends at low speed, CubicBezier (0.0, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * EaseOut. Indicates that the animation ends at low speed, CubicBezier (0.0, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * EaseOut. Indicates that the animation ends at low speed, CubicBezier (0.0, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    EaseOut,
    /**
     * EaseInOut. Indicates that the animation starts and ends at low speed, CubicBezier (0.42, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * EaseInOut. Indicates that the animation starts and ends at low speed, CubicBezier (0.42, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * EaseInOut. Indicates that the animation starts and ends at low speed, CubicBezier (0.42, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * EaseInOut. Indicates that the animation starts and ends at low speed, CubicBezier (0.42, 0.0, 0.58, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    EaseInOut,
    /**
     * FastOutSlowIn. Standard curve, cubic-bezier (0.4, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * FastOutSlowIn. Standard curve, cubic-bezier (0.4, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * FastOutSlowIn. Standard curve, cubic-bezier (0.4, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * FastOutSlowIn. Standard curve, cubic-bezier (0.4, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    FastOutSlowIn,
    /**
     * LinearOutSlowIn. Deceleration curve, cubic-bezier (0.0, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * LinearOutSlowIn. Deceleration curve, cubic-bezier (0.0, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * LinearOutSlowIn. Deceleration curve, cubic-bezier (0.0, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * LinearOutSlowIn. Deceleration curve, cubic-bezier (0.0, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    LinearOutSlowIn,
    /**
     * FastOutLinearIn. Acceleration curve, cubic-bezier (0.4, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * FastOutLinearIn. Acceleration curve, cubic-bezier (0.4, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * FastOutLinearIn. Acceleration curve, cubic-bezier (0.4, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * FastOutLinearIn. Acceleration curve, cubic-bezier (0.4, 0.0, 1.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    FastOutLinearIn,
    /**
     * ExtremeDeceleration. Abrupt curve, cubic-bezier (0.0, 0.0, 0.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * ExtremeDeceleration. Abrupt curve, cubic-bezier (0.0, 0.0, 0.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * ExtremeDeceleration. Abrupt curve, cubic-bezier (0.0, 0.0, 0.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * ExtremeDeceleration. Abrupt curve, cubic-bezier (0.0, 0.0, 0.0, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    ExtremeDeceleration,
    /**
     * Sharp. Sharp curves, cubic-bezier (0.33, 0.0, 0.67, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Sharp. Sharp curves, cubic-bezier (0.33, 0.0, 0.67, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Sharp. Sharp curves, cubic-bezier (0.33, 0.0, 0.67, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Sharp. Sharp curves, cubic-bezier (0.33, 0.0, 0.67, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Sharp,
    /**
     * Rhythm. Rhythmic curve, cubic-bezier (0.7, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Rhythm. Rhythmic curve, cubic-bezier (0.7, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Rhythm. Rhythmic curve, cubic-bezier (0.7, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Rhythm. Rhythmic curve, cubic-bezier (0.7, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Rhythm,
    /**
     * Smooth. Smooth curves, cubic-bezier (0.4, 0.0, 0.4, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Smooth. Smooth curves, cubic-bezier (0.4, 0.0, 0.4, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Smooth. Smooth curves, cubic-bezier (0.4, 0.0, 0.4, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Smooth. Smooth curves, cubic-bezier (0.4, 0.0, 0.4, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Smooth,
    /**
     * Friction. Damping curves, CubicBezier (0.2, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 7
     */
    /**
     * Friction. Damping curves, CubicBezier (0.2, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Friction. Damping curves, CubicBezier (0.2, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Friction. Damping curves, CubicBezier (0.2, 0.0, 0.2, 1.0).
     *
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    Friction,
  }

  /**
   * Interface for curve object.
   *
   * @typedef ICurve
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Interface for curve object.
   *
   * @typedef ICurve
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Interface for curve object.
   *
   * @typedef ICurve
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since 11
   */
  /**
   * Interface for curve object.
   *
   * @interface ICurve
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @form
   * @atomicservice
   * @since 20
   * @arkts 1.1&1.2
   */
  export interface ICurve {
    /**
     * Get curve value by fraction.
     *
     * @param { number } fraction -Indicates the current normalized time parameter. Value range: [0, 1].
     * Note: If the value is less than 0, it will be processed as 0. If the value is greater than 1, 1 is used.
     * @returns { number }
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @since 9
     */
    /**
     * Get curve value by fraction.
     *
     * @param { number } fraction -Indicates the current normalized time parameter. Value range: [0, 1].
     * Note: If the value is less than 0, it will be processed as 0. If the value is greater than 1, 1 is used.
     * @returns { number }
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @since 10
     */
    /**
     * Implements calculation.
     *
     * @param { number } fraction - Current normalized time.<br>Value range: [0, 1].
     * <p>**NOTE**:
     * <br>A value less than 0 is handed as **0**. A value greater than 1 is handed as **1**.
     * </p>
     * @returns { number } - Curve interpolation corresponding to the normalized time point.
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @atomicservice
     * @since 11
     */
    /**
     * Get curve value by fraction.
     *
     * @param { number } fraction -Indicates the current normalized time parameter. Value range: [0, 1].
     *     Note: If the value is less than 0, it will be processed as 0. If the value is greater than 1, 1 is used.
     * @returns { number }
     * @syscap SystemCapability.ArkUI.ArkUI.Full
     * @crossplatform
     * @form
     * @atomicservice
     * @since 20
     * @arkts 1.1&1.2
     */
    interpolate(fraction: number): number;
  }

  /**
   * Initializes the interpolator curve when called.
   *
   * @param { Curve } [curve] The default value is Curve.Linear
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Initializes the interpolator curve when called.
   *
   * @param { Curve } [curve] The default value is Curve.Linear
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Implements initialization for the interpolation curve,
   * which is used to create an interpolation curve based on the input parameter.
   *
   * @param { Curve } [curve] - Curve type.<br>Default value: **Curve.Linear**.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function initCurve(curve?: Curve): ICurve;

  /**
   * Initializes the interpolator curve when called.
   *
   * @param { Curve } [curve]
   * @returns { string }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 7
   * @deprecated since 9
   * @useinstead initCurve
   */
  function init(curve?: Curve): string;

  /**
   * Constructs a step curve when called.
   *
   * @param { number } count -The number of steps. The range of this value is [1, +∞).
   * @param { boolean } end -A step change occurs at the start or end of each interval.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Constructs a step curve when called.
   *
   * @param { number } count -The number of steps. The range of this value is [1, +∞).
   * @param { boolean } end -A step change occurs at the start or end of each interval.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a step curve.
   *
   * @param { number } count - Number of steps. The value must be a positive integer.<br>Value range: [1, +∞).
   * <p>**NOTE**:
   * <br>A value less than 1 evaluates to the value **1**.
   * </p>
   * @param { boolean } end -Whether jumping occurs when the interpolation ends.
   * **true**: Jumping occurs when the interpolation ends.
   * *false**: Jumping occurs when the interpolation starts.
   * @returns { ICurve } Interpolation curve.
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function stepsCurve(count: number, end: boolean): ICurve;

  /**
   * Constructs a custom curve when called.
   *
   * @param { function } interpolate - fraction range is [0,1], the return number must between [0,1].
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a custom curve.
   *
   * @param { function } interpolate - Custom interpolation callback.fraction: input x value for interpolation.
   * when the animation starts. Value range: [0, 1]The return value is the y value of the curve. Value range: [0, 1].
   * <p>**NOTE**:
   * <br>If fraction is 0, the return value 0 corresponds to the animation start point; any other return value means
   * <br>that the animation jumps at the start point.If fraction is 1, the return value 1 corresponds to the animation
   * <br>end point; any other return value means that the end value of the animation is not the value of the state
   * <br>variable, which will result in an effect of transition from that end value to the value of the state variable.
   * </p>
   * @returns { ICurve } Interpolation curve.
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function customCurve(interpolate: (fraction: number) => number): ICurve;
  
  /**
   * Constructs a step curve when called.
   *
   * @param { number } count
   * @param { boolean } end
   * @returns { string }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 7
   * @deprecated since 9
   * @useinstead stepsCurve
   */
  function steps(count: number, end: boolean): string;

  /**
   * Constructs a third-order Bezier curve when called.
   * @param { number } x1 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y1 -Value range (-∞, +∞).
   * @param { number } x2 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y2 -Value range (-∞, +∞).
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Constructs a third-order Bezier curve when called.
   *
   * @param { number } x1 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y1 -Value range (-∞, +∞).
   * @param { number } x2 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y2 -Value range (-∞, +∞).
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a cubic Bezier curve. The curve values must be between 0 and 1.
   *
   * @param { number } x1 - X coordinate of the first point on the Bezier curve.<br>Value range: [0, 1].
   * <p>**NOTE**:
   * <br>A value less than 0 is handed as **0**. A value greater than 1 is handed as **1**.
   * </p>
   * @param { number } y1 - Y coordinate of the first point on the Bezier curve.<br>Value range: (-∞, +∞).
   * @param { number } x2 - X coordinate of the second point on the Bezier curve.<br>Value range: [0, 1].
   * <p>**NOTE**:
   * <br>A value less than 0 is handed as **0**. A value greater than 1 is handed as **1**.
   * </p>
   * @param { number } y2 - Y coordinate of the second point on the Bezier curve.<br>Value range: (-∞, +∞).
   * @returns { ICurve } Interpolation curve.
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function cubicBezierCurve(x1: number, y1: number, x2: number, y2: number): ICurve;

  /**
   * Creates a cubic Bezier curve. The curve value must range from 0 to 1. This API is deprecated since API version 9.
   * You are advised to use cubicBezierCurve instead.
   *
   * @param { number } x1 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y1 -Value range (-∞, +∞).
   * @param { number } x2 -Value range [0, 1].
   * Note: If the value is less than 0, 0 is used. If the value is greater than 1, 1 is used.
   * @param { number } y2 -Value range (-∞, +∞).
   * @returns { string }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 7
   * @deprecated since 9
   * @useinstead cubicBezierCurve
   */
  function cubicBezier(x1: number, y1: number, x2: number, y2: number): string;

  /**
   * Constructs a spring curve when called. For more information about the meaning of the parameter, see spring().
   *
   * @param { number } velocity -Value range (-∞, +∞).
   * @param { number } mass -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @param { number } stiffness -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @param { number } damping -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Constructs a spring curve when called.
   *
   * @param { number } velocity -Value range (-∞, +∞).
   * @param { number } mass -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @param { number } stiffness -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @param { number } damping -Value range (0, +∞). Note: If the value is less than or equal to 0, 1 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a spring curve. The curve shape is subject to the spring parameters, and the animation duration
   * is subject to the **duration** parameter in **animation** and **animateTo**.
   *
   * @param { number } velocity - Initial velocity. It is applied by external factors to the spring animation,
   * designed to help ensure the smooth transition from the previous motion state. The velocity is the normalized
   * velocity, and its value is equal to the actual velocity at the beginning of the animation divided by the
   * animation attribute change value.Value range: (-∞, +∞).
   * @param { number } mass - Mass, which influences the inertia in the spring system. The greater the mass,
   * the greater the amplitude of the oscillation, and the slower the speed of restoring to the equilibrium position.
   * Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value 1 is used.
   * </p>
   * @param { number } stiffness - Stiffness.It is the degree to which an object deforms by resisting the force 
   * applied. In an elastic system, the greater the stiffness, the stronger the ability to resist deformation, 
   * and the faster the speed of restoring to the equilibrium position.Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value 1 is used.
   * </p>
   * @param { number } damping -Damping. It is used to describe the oscillation and attenuation of the system 
   * after being disturbed. The larger the damping, the smaller the number of oscillations of elastic motion,
   * and the smaller the oscillation amplitude.Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value 1 is used.
   * </p>
   * @returns { ICurve } Interpolation curve.
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function springCurve(velocity: number, mass: number, stiffness: number, damping: number): ICurve;

  /**
   * Constructs a spring curve when called.
   *
   * @param { number } velocity -Initial velocity. An influence parameter of external factors on elastic dynamics,
   * purpose is to ensure a smooth transition of the object from the previous state of motion to the elastic dynamics.
   * @param { number } mass -Quality. The force object of the elastic system will have an inertial effect on elastic
   * system. The greater the mass, the greater the amplitude of the oscillation.
   * @param { number } stiffness -The degree to which an object is deformed by resisting the applied force.
   * @param { number } damping -Pure number, Used to describe oscillation and decay of a system after being disturbed.
   * @returns { string }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 7
   * @deprecated since 9
   * @useinstead springCurve
   */
  function spring(velocity: number, mass: number, stiffness: number, damping: number): string;

  /**
   * Constructs a spring motion when called.
   *
   * @param { number } [response] The default value is 0.55. Unit: seconds. Value range: (0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.55 is used.
   * @param { number } [dampingFraction] The default value is 0.825. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.825 is used.
   * @param { number } [overlapDuration] The default value is 0. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Constructs a spring motion when called.
   *
   * @param { number } [response] The default value is 0.55. Unit: seconds. Value range: (0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.55 is used.
   * @param { number } [dampingFraction] The default value is 0.825. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.825 is used.
   * @param { number } [overlapDuration] The default value is 0. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a spring animation curve. 
   * If multiple spring animations are applied to the same attribute of an object,
   * each animation replaces their predecessor and inherits the velocity.
   *
   * @param { number } [response] Duration of one complete oscillation.
   * <br>Default value: **0.55**.<br>Unit: second<br>Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the default value **0.55** is used.
   * </p>
   * @param { number } [dampingFraction] Damping coefficient.
   * **0**: undamped. In this case, the spring oscillates forever.<br>> 0 and < 1: underdamped. 
   * In this case, the spring overshoots the equilibrium position.<br>**1**: critically damped.
   * 1: overdamped. In this case, the spring approaches equilibrium gradually.<br>Default value: **0.825**.
   * Unit: second.
   * Value range: [0, +∞).
   * <p>**NOTE**:
   * <br>A value less than 0 evaluates to the default value **0.825**.
   * </p>
   * @param { number } [overlapDuration]  Duration for animations to overlap, in seconds.
   * When animations overlap, the **response** values of these animations will transit smoothly over this duratio
   * if they are different.<br>Default value: **0**<br>Unit: second<br>Value range: [0, +∞).
   * <p>**NOTE**
   * <br>A value less than 0 evaluates to the default value **0**.
   * <br>The spring animation curve is physics-based. Its duration depends on the **springMotion** parameters and
   * the previous velocity, rather than the **duration** parameter in animation, animateTo, or pageTransition. 
   * The time cannot be normalized. Therefore, the interpolation cannot be obtained using
   * the **interpolate** function of the curve.
   * </p>
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function springMotion(response?: number, dampingFraction?: number, overlapDuration?: number): ICurve;

  /**
   * Constructs a responsive spring motion when called.
   *
   * @param { number } [response] The default value is 0.15. Unit: seconds. Value range: (0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.15 is used.
   * @param { number } [dampingFraction] The default value is 0.86. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.86 is used.
   * @param { number } [overlapDuration] The default value is 0.25. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.25 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @since 9
   */
  /**
   * Constructs a responsive spring motion when called.
   *
   * @param { number } [response] The default value is 0.15. Unit: seconds. Value range: (0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.15 is used.
   * @param { number } [dampingFraction] The default value is 0.86. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.86 is used.
   * @param { number } [overlapDuration] The default value is 0.25. Unit: seconds. Value range: [0, +∞).
   * Note: If a value is set to 0 or less, the default value of 0.25 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates a responsive spring animation curve. It is a special case of [springMotion](#curvesspringmotion9),
   * with the only difference in the default values. It can be used together with **springMotion**.
   *
   * @param { number } [response] See **response** in **springMotion**.<br>Default value: **0.15**.
   * Unit: second<br>Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the default value **0.15** is used.
   * </p>
   * @param { number } [dampingFraction] See **dampingFraction** in **springMotion**.<br>Default value: **0.86**.
   * Unit: second<br>Value range: [0, +∞).
   * <p>**NOTE**
   * <br>A value less than 0 evaluates to the default value **0.86**.
   * </p>
   * @param { number } [overlapDuration] See **overlapDuration** in **springMotion**.<br>Default value: **0.25**.
   * Unit: second<br>Value range: [0, +∞).
   * <p>**NOTE**:
   * <br>A value less than 0 evaluates to the default value **0.25**.
   * <br>To apply custom settings for a spring animation, you are advised to use **springMotion**.
   * <br>When using **responsiveSpringMotion**, you are advised to retain the default settings.
   * <br>The duration of the responsive spring animation depends on the **responsiveSpringMotion** parameters and the
   * previous velocity, rather than the duration parameter in animation, animateTo, or pageTransition.
   * <br>In addition, the interpolation cannot be obtained using the **interpolate** function of the curve.
   * </p>
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function responsiveSpringMotion(response?: number, dampingFraction?: number, overlapDuration?: number): ICurve;

  /**
   * Constructs an interpolating spring curve when called, the animation duration can not be specified manually,
   * and is determined by parameters of the curve. It produces values change from 0 to 1, and then uses interpolator
   * to calculate the actual animation values.
   *
   * @param { number } velocity - the initial velocity of the spring, and is a normalized speed corresponding to the
   * value changes from 0 to 1,specific value range (-∞, ∞).
   * @param { number } mass - the mass of object in the mass-damper-spring system, value range (0, +∞).
   * Note: If the value is less than or equal to 0, the value 1 is used.
   * @param { number } stiffness - the stiffness of spring, value range (0, +∞).
   * Note: If the value is less than or equal to 0, the value 1 is used.
   * @param { number } damping - the damping value of spring, value range (0, +∞).
   * Note: If the value is less than or equal to 0, the value 1 is used.
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @since 10
   */
  /**
   * Creates an interpolating spring curve animated from 0 to 1. The actual animation value is calculated based
   * on the curve. The animation duration is subject to the curve parameters, rather than the **duration** parameter
   * in **animation** or **animateTo**.
   *
   * @param { number } velocity - Initial velocity. It is applied by external factors to the spring animation,
   * designed to help ensure the smooth transition from the previous motion state.
   * The velocity is the normalized velocity, and its value is equal to the actual velocity at the beginning of
   * the animation divided by the animation attribute change value.<br>Value range: (-∞, +∞).
   * @param { number } mass - Mass, which influences the inertia in the spring system. The greater the mass,
   * the greater the amplitude of the oscillation, and the slower the speed of restoring to the equilibrium position.
   * <br>Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value **1** is used.
   * </p>
   * @param { number } stiffness - Stiffness. It is the degree to which an object deforms by resisting
   * the force applied. In an elastic system, the greater the stiffness, the stronger the ability to resist
   * deformation, and the faster the speed of restoring to the equilibrium position.<br>Value range: (0, +∞).
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value **1** is used.
   * </p>
   * @param { number } damping - Damping. It is used to describe the oscillation and attenuation of the system
   * after being disturbed. The larger the damping, the smaller the number of oscillations of elastic motion,
   * and the smaller the oscillation amplitude.<br>Value range: (0, +∞)<br>
   * <p>**NOTE**:
   * <br>If this parameter is set to a value less than or equal to 0, the value **1** is used.
   * </p>
   * @returns { ICurve }
   * @syscap SystemCapability.ArkUI.ArkUI.Full
   * @crossplatform
   * @atomicservice
   * @since arkts {'1.1':'11','1.2':'20'}
   * @arkts 1.1&1.2
   */
  export function interpolatingSpring(velocity: number, mass: number, stiffness: number, damping: number): ICurve;
}

export default curves;