1 /*
2 * Copyright (c) 2021-2023 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 #include "animation/rs_spring_interpolator.h"
17
18 #include <algorithm>
19 #include <cmath>
20
21 #include "platform/common/rs_log.h"
22
23 namespace OHOS {
24 namespace Rosen {
25
RSSpringInterpolator(float response,float dampingRatio,float initialVelocity)26 RSSpringInterpolator::RSSpringInterpolator(float response, float dampingRatio, float initialVelocity)
27 // initialOffset: 1, minimumAmplitude: 0.0001
28 : RSSpringModel<float>(response, dampingRatio, -1, initialVelocity, 0.0001)
29 {
30 estimatedDuration_ = EstimateDuration();
31 }
32
RSSpringInterpolator(uint64_t id,float response,float dampingRatio,float initialVelocity)33 RSSpringInterpolator::RSSpringInterpolator(uint64_t id, float response, float dampingRatio, float initialVelocity)
34 // initialOffset: 1, minimumAmplitude: 0.0001
35 : RSSpringModel<float>(response, dampingRatio, -1, initialVelocity, 0.0001), RSInterpolator(id)
36 {
37 estimatedDuration_ = EstimateDuration();
38 }
39
InterpolateImpl(float fraction) const40 float RSSpringInterpolator::InterpolateImpl(float fraction) const
41 {
42 if (fraction <= 0) {
43 return 0;
44 } else if (fraction >= 1.0f) {
45 return 1.0f;
46 }
47 // map [0, 1] to [0, duration], and calculate the output value
48 double mappedTime = fraction * estimatedDuration_;
49 return 1.0f + CalculateDisplacement(mappedTime);
50 }
51 } // namespace Rosen
52 } // namespace OHOS
53