1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License
15  */
16 
17 package com.android.incallui.answer.impl.classifier;
18 
19 /**
20  * A classifier which looks at the ratio between the total length covered by the stroke and the
21  * distance between the first and last point from this stroke.
22  */
23 class EndPointRatioClassifier extends StrokeClassifier {
EndPointRatioClassifier(ClassifierData classifierData)24   public EndPointRatioClassifier(ClassifierData classifierData) {
25     this.classifierData = classifierData;
26   }
27 
28   @Override
getTag()29   public String getTag() {
30     return "END_RTIO";
31   }
32 
33   @Override
getFalseTouchEvaluation(Stroke stroke)34   public float getFalseTouchEvaluation(Stroke stroke) {
35     float ratio;
36     if (stroke.getTotalLength() == 0.0f) {
37       ratio = 1.0f;
38     } else {
39       ratio = stroke.getEndPointLength() / stroke.getTotalLength();
40     }
41     return EndPointRatioEvaluator.evaluate(ratio);
42   }
43 }
44