1 /*
2  * Copyright (c) 2021 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 FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_PARAM_TRANSFER_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_PARAM_TRANSFER_H
18 
19 #include "base/memory/ace_type.h"
20 #include "base/utils/utils.h"
21 
22 namespace OHOS::Ace {
23 
24 class ParamTransfer : public AceType {
25     DECLARE_ACE_TYPE(ParamTransfer, AceType);
26 
27 public:
ParamTransfer(double value)28     explicit ParamTransfer(double value) : value_(value) {}
29     ~ParamTransfer() override = default;
30 
31     static constexpr double CURVE_COEFFICIENT = 0.18;
32 
33     // value control value
34     // delta the distance between current index and control index
35     virtual double Transfer(double value, int32_t delta) = 0;
36 
GetParam()37     double GetParam() const
38     {
39         return value_;
40     }
41 
SetParam(double value)42     void SetParam(double value)
43     {
44         value_ = value;
45     }
46 
47 protected:
48     double value_ = 0.0;
49 };
50 
51 // Linear Transfer
52 class LinearParamTransfer : public ParamTransfer {
53     DECLARE_ACE_TYPE(LinearParamTransfer, ParamTransfer);
54 
55 public:
LinearParamTransfer(double value)56     explicit LinearParamTransfer(double value) : ParamTransfer(value) {}
57     ~LinearParamTransfer() override = default;
58 
Transfer(double value,int32_t delta)59     double Transfer(double value, int32_t delta) override
60     {
61         return value - value_ * delta;
62     }
63 };
64 
65 // Exponential Transfer
66 class ExpParamTransfer : public ParamTransfer {
67     DECLARE_ACE_TYPE(ExpParamTransfer, ParamTransfer);
68 
69 public:
ExpParamTransfer(double value)70     explicit ExpParamTransfer(double value) : ParamTransfer(value) {}
71     ~ExpParamTransfer() override = default;
72 
Transfer(double value,int32_t delta)73     double Transfer(double value, int32_t delta) override
74     {
75         return std::pow(delta + 1, -value_ * CURVE_COEFFICIENT) * value;
76     }
77 };
78 
79 } // namespace OHOS::Ace
80 
81 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_PARAM_TRANSFER_H
82