1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef META_INTERFACE_IEASING_CURVE_H
17 #define META_INTERFACE_IEASING_CURVE_H
18 
19 #include <meta/base/namespace.h>
20 #include <meta/interface/curves/intf_curve_1d.h>
21 
22 META_BEGIN_NAMESPACE()
23 
24 META_REGISTER_INTERFACE(IEasingCurve, "a27e0158-28c6-4e72-8ea2-a43301736653")
25 
26 /**
27  * @brief IEasingCurve is the interface for all 1D easing curves, which
28  *        require the transform input to be between [0,1].
29  */
30 class IEasingCurve : public ICurve1D {
31     META_INTERFACE(ICurve1D, IEasingCurve)
32 public:
33     /**
34      * @brief The transformation function for this curve.
35      * @param t The point along the curve where the transformation should happen.
36      *          For easing curves, t should always be between [0,1].
37      * @return Transformed value. For t=0 the function should return 0, and for t=1
38      *         it should return 1.
39      */
40     float Transform(float t) const override = 0;
41 };
42 
43 META_END_NAMESPACE()
44 
45 #endif // API_UI_EASING_CURVE_H
46